PMIC with Integrated Charger Smart Power Selector Handheld Devices

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

PMIC with Integrated Charger Smart Power Selector Handheld Devices

Datasheet Thumbnail

Top Searches for this datasheet

19-0885; 8/07
PMIC with Integrated Charger Smart Power Selector Handheld Devices
16V-Tolerant Inputs Automatically Powers from External Power Battery Operates with Battery Present Single-Cell Li+/Li-Poly Charger Three 2MHz Step-Down Regulators Efficiency Linear Regulators Output Power-Up Sequencing Thermal-Overload Protection
MAX8671X
MAX8671X integrated power-management (PMIC) ideal portable media players other handheld devices. addition five regulated output voltages, MAX8671X integrates 1-cell lithium (Li+) lithium polymer (Li-Poly) charger Smart Power Selectorwith dual (AC-to-DC adapter USB) power inputs*. dual-input Smart Power Selector supports products with dual single power connectors. power switches charging switching system load between battery external power included on-chip. external MOSFETs required. Maxim's Smart Power Selector makes best limited AC-to-DC adapter power. Battery charge current input current limit independently set. Input power used system charges battery. Charge current current limit programmable while input current 100mA 500mA. Automatic input selection switches system load from battery external power. Other features include overvoltage protection, charge status fault outputs, power-OK monitors, charge timer, battery thermistor monitor. addition, on-chip thermal limiting reduces battery charge rate prevent charger overheating. MAX8671X offers adjustable voltages outputs. Similar parts with factory-preset output voltages also available (contact factory availability).
Ordering Information
PART TEMP RANGE PIN-PACKAGE Thin QFN-EP* CODE T4055-1
MAX8671XETL+ -40°C +85°C
+Denotes lead-free package. Exposed paddle.
Simplified Applications Circuit
MAX8671X
Applications
Portable Audio Players Portable Navigators
AC-TO-DC ADAPTER
OUT1 OUT1 VSYS 425mA OUT2 VSYS 425mA OUT3 VSYS 425mA Li+/LiPo BATTERY
PEN1 PEN2 USUS CST1 CST2
OUT2
OUT3
OUT4
OUT4 0.6V VSYS 180mA OUT5 0.6V VSYS 180mA
*Protected Patent #6,507,172.
OUT5
Smart Power Selector trademark Maxim Integrated Products, Inc.
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim Direct 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Table Contents
General Description Applications Features Ordering Information Simplified Applications Circuit Table Contents Absolute Maximum Ratings Electrical Characteristics Typical Operating Characteristics Description Detailed Description Smart Power Selector System Load Switch Power Input (USB) Power-OK Output (UOK) Suspend (USUS) Power Input (DC) Power-OK Output (DOK) Battery Charger Battery Regulation Voltage (BVSET) Charge Enable Input (CEN) Charge Status Outputs (CST1, CST2) Charge Timer (CT) Setting Charger Currents (CISET) Step-Down Converters (REG1, REG2, REG3) Step-Down Dropout Minimum Duty Cycle Step-Down Input Capacitors Step-Down Output Capacitors Step-Down Inductor Step-Down Converter Output Current Linear Regulators (REG4, REG5) Linear Regulator Enable/Disable (EN) Sequencing Soft-Start/Inrush Current Active Discharge Shutdown Undervoltage Overvoltage Lockout USB/DC UVLO USB/DC OVLO UVLO REG4/REG5 UVLO Thermal Limiting Overload Protection Smart Power Selector Thermal-Overload Protection Regulator Thermal-Overload Shutdown Battery Charger Thermistor Input (THM) Layout Routing Package Marking Chip Information Configuration Package Information
PMIC with Integrated Charger Smart Power Selector Handheld Devices
Table Contents (continued)
Tables Table Input Limiter Control Logic Table Current Limit Standard Values RDISET Table Charge Status Outputs Table Charge Times Table Ideal Charge Currents Charge Setting Resistor Table Suggested Inductors Table 0.8mm Thin Thermal Characteristics Table Trip Temperatures Different Thermistors Figures Figure MAX8671X Typical Application Circuit Figure Functional Diagram Figure Power-OK Logic Figure Programming Current Limit Figure Power-OK Logic Figure Li+/Li-Poly Charge Profile Figure Charger State Diagram Figure Programming Charge Current Figure Monitoring Battery Charge Current with Voltage from CISET AGND Figure Step-Down Converter Maximum Output Current Example Figure Enable/Disable Logic Figure Enable Disable Waveforms Figure REG5 Disable Detail Figure Thermistor Input Figure Package Marking Example
MAX8671X
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
ABSOLUTE MAXIMUM RATINGS
USB, PEN1 AGND.-0.3V +16V SYS, BAT, PV1, PV2, AGND.-0.3V PG1, PG2, PG3, AGND .-0.3V +0.3V PV1, PV2, SYS.-0.3V +0.3V AGND .-0.3V +4.0V CISET, DISET, BVSET, AGND.-0.3V (VVL 0.3V) PV4, PV5, FB1, FB2, AGND .-0.3V (VSYS 0.3V) PEN2, USUS, CEN, AGND .-0.3V CST1, CST2, DOK, AGND .-0.3V OUT4, AGND .-0.3V (VPV4 0.3V) OUT5, AGND .-0.3V (VPV5 0.3V) LX1, LX2, Continuous Current (Note 1).1.5A Continuous Current .1.5A Continuous Current .1.5A Continuous Power Dissipation +70°C) 40-Pin, 5mm, Thin (derate 35.7mW/°C above +70°C).2857mW Operating Junction Temperature.+150°C Storage Junction Temperature Range .-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
Note internal clamp diodes PV_. Applications that forward bias these diodes must take care exceed package power dissipation limits.
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER SYMBOL CONDITIONS Operating voltage Withstand voltage USUS low, high, system current less than input current limit rising, 500mV typical hysteresis rising, 400mV typical hysteresis PEN1 low, VSYS PEN2 low, USUS unconnected, low, PEN1 low, +25°C, PEN2 high, load USUS (Note PEN1 high, RDISET PEN1 low, USUS high USUS low, low; ISYS 0mA, IBAT 0mA, low; load USUS low, high; ISYS 0mA, load Minimum DC-to-BAT Voltage Headroom Minimum DC-to-SYS Voltage Headroom DC-to-SYS Dropout Resistance falling, 200mV hysteresis falling, 200mV hysteresis ISYS 400mA, USUS 3.95 4.00 4.05 UNITS POWER INPUT (VDC 5.0V, low) Voltage Range Regulation Voltage Undervoltage Threshold Overvoltage Threshold VSYS_REG VDCL VDCH
Current Limit
IDCLIM
1000
1050
RDISET Resistance Range
0.11
Quiescent Current
IDCIQ
0.325 0.600
PMIC with Integrated Charger Smart Power Selector Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER DC-to-SYS Soft-Start Time Thermal-Limit Temperature Thermal-Limit Gain POWER INPUT (VUSB 5.0V, low) Voltage Range VUSB Operating voltage Withstand voltage VUSB USUS low, high, system current less than input current limit VUSB rising, 500mV hysteresis VUSB rising, 400mV hysteresis VUSB VSYS unconnected, low, +25°C, (Note USUS high Quiescent Current IUSBIQ USUS low, low; ISYS 0mA, IBAT 0mA, load USUS low, high; ISYS 0mA, load Minimum USB-to-BAT Voltage Headroom Minimum USB-to-SYS Voltage Headroom USB-to-SYS Dropout Resistance USB-to-SYS Soft-Start Time Thermal-Limit Temperature Thermal-Limit Gain SYSTEM (VDC 5.0V, low) System Operating Voltage Range System Undervoltage Threshold VSYS VUVLO_SYS falling, 100mV hysteresis 2.45 2.50 2.55 tSS-U-S temperature which current limit reduced Amount input current reduction above thermal-limit temperature VUSB falling, 200mV hysteresis VUSB falling, 200mV hysteresis VUSB ISYS 400mA, USUS PEN2 low, USUS PEN2 high, USUS 3.95 0.11 0.325 0.600 %/°C 4.05 SYMBOL tSS-D-S CONDITIONS Starting when present Starting with present temperature which current limit reduced Amount input current reduction above thermal-limit temperature +100 UNITS %/°C
MAX8671X
Regulation Voltage Undervoltage Threshold Overvoltage Threshold
VSYS_REG VUSBL VUSBH
Current Limit
IUSBLIM
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER BAT-to-SYS Reverse Regulation Voltage SYMBOL CONDITIONS sourcing current sourcing 105mA sourcing 905mA UNITS
VBSREG
unconnected, low, VBAT VUSB USUS high, PEN1 low, low, VBAT IPV1 IPV2 IPV3 IPV4 IPV5 ISYS unconnected, high, VBAT (step-down converters dropout), (Note unconnected, high, VBAT 2.8V least step-down converter dropout), (Note VUSB USUS high, high, VBAT (Note unconnected, high, VBAT 4.0V, high BATTERY CHARGER (VDC 5.0V, low) BAT-to-SYS On-Resistance VUSB VBAT 4.2V, ISYS BVSET BVSET unconnected Regulation Voltage (Figure VBATREG BVSET AGND RBVSET 49.9k AGND Recharge Threshold Prequalification Threshold RCISET Resistance Range CISET Voltage VCISET VBATRCHG (Note VBATPRQ VBAT rising, 180mV hysteresis, Figure Guaranteed fast-charge current limit RCISET 7.5k, IBAT 267mA, Figure +25°C -40°C +85°C +25°C -40°C +85°C +25°C -40°C +85°C 4.174 4.145 4.073 4.047 4.325 4.297 -170
Quiescent Current
0.08 4.200 4.200 4.100 4.100 4.350 4.350 -120
0.16 4.221 4.242 4.121 4.141 4.376 4.398
PMIC with Integrated Charger Smart Power Selector Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER SYMBOL CONDITIONS Low-power charging from input, unconnected, RCISET PEN2 low, USUS Low-power charging from input, RCISET PEN1 low, PEN2 low, USUS High-power charging from input, unconnected, RCISET PEN2 high, USUS High-power charging from input, RCISET PEN2 high, USUS AC-to-DC adapter charging from input, RDISET RCISET 15k, PEN1 high AC-to-DC adapter charging from input, RDISET RCISET 7.5k, PEN1 high AC-to-DC adapter charging from input, RDISET RCISET 3.74k, PEN1 high VBAT 2.5V, RCISET 3.74k +25°C, RCISET 3.74k (Note power connected and/or power connected, high UNITS
MAX8671X
Fast-Charge Current Limit
1.10 0.22 0.88
mA/ms
Prequalification Current Top-Off Threshold
Leakage Current
low, +25°C Slew rate
Charger Soft-Start Time
tSS_CHG
Time from 500mA Time from 100mA Time from 100mA 500mA 0.15µF CISET voltage when fast-charge timer suspends; 300mV translates maximum fast-charge current limit CISET voltage when fast-charge timer suspends; 750mV translates maximum fast-charge current limit
Timer Accuracy Timer Suspend Threshold
Timer Extend Threshold
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER Prequalification Time Fast-Charge Time Top-Off Time SYMBOL 0.15µF 0.15µF CONDITIONS UNITS
THERMISTOR INPUT (THM) (VDC 5.0V, low) Threshold, Cold Threshold, Input Leakage Current VTHMC VTHMH ITHM VTHM rising, 65mV hysteresis VTHM falling, 65mV hysteresis AGND +25°C AGND +85°C 73.0 27.0 -0.100 74.0 28.4 0.001 0.01 rising +165 supplied from 4.7µH, 0.13 (Note (Note +25°C +85°C 0.997 VFB1 1.012V mode mode (Note VPV1 ILX1 180mA VPV1 ILX1 180mA 0.555 0.615 0.675 1.012 1.028 VSYS VSYS 75.5 30.0 +0.200
POWER SEQUENCING (Figures REG3 Enable Delay REG1 Soft-Start Time REG3 REG1/2 Delay REG2 Soft-Start Time REG3 Soft-Start Time REG1/2 REG4 Delay REG4 Soft-Start Time REG5 Soft-Start Time REGULATOR THERMAL SHUTDOWN Thermal Shutdown Temperature Thermal Shutdown Hysteresis REG1-SYNCHRONOUS STEP-DOWN CONVERTER Input Voltage Maximum Output Current Voltage Adjustable Output Voltage Range Leakage Current Load Regulation Line Regulation p-Channel On-Resistance n-Channel On-Resistance p-Channel Current-Limit Threshold tSS1 tSS2 tSS3 tSS4 tSS5
PMIC with Integrated Charger Smart Power Selector Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER Skip Mode Transition Current n-Channel Zero-Crossing Threshold Maximum Duty Cycle Minimum Duty Cycle Internal Oscillator Frequency Internal Discharge Resistance Shutdown Input Voltage Maximum Output Current Voltage Adjustable Output Voltage Range Leakage Current Load Regulation Line Regulation p-Channel On-Resistance n-Channel On-Resistance p-Channel Current-Limit Threshold Skip Mode Transition Current n-Channel Zero-Crossing Threshold Maximum Duty Cycle Minimum Duty Cycle Internal Oscillator Frequency Internal Discharge Resistance Shutdown Input Voltage Maximum Output Current Voltage Adjustable Output Voltage Range Leakage Current Load Regulation VFB2 1.012V mode +25°C +85°C low, resistance from mode (Note VFB2 1.012V mode mode (Note VPV2 ILX2 180mA VPV2 ILX2 180mA 0.555 +25°C +85°C low, resistance from mode SYMBOL (Note CONDITIONS 12.5 UNITS
MAX8671X
REG2-SYNCHRONOUS STEP-DOWN CONVERTER supplied from 4.7µH, 0.13 (Note (Note 0.997 0.615 12.5 0.675 1.012 1.028 VSYS VSYS
REG3-SYNCHRONOUS STEP-DOWN CONVERTER supplied from 4.7µH, 0.13 (Note (Note 0.997 1.012 1.028 VSYS VSYS
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER Line Regulation p-Channel Current-Limit Threshold Skip Mode Transition Current n-Channel Zero-Crossing Threshold p-Channel On-Resistance n-Channel On-Resistance Maximum Duty Cycle Minimum Duty Cycle Internal Oscillator Frequency Internal Discharge Resistance Shutdown REG4-LINEAR REGULATOR Operating Range Undervoltage Lockout Threshold Voltage Leakage Current Drop-Out Resistance Current Limit VPV4 VPV4 rising, 100mV hysteresis load VFB4 0.6V +25°C +85°C 1.55 0.582 1.60 0.600 0.45 0.75 VSYS 1.65 0.618 low, resistance from mode VPV3 ILX3 180mA VPV3 ILX3 180mA (Note SYMBOL CONDITIONS mode (Note 0.555 0.615 12.5 0.675 UNITS
OUT4, VPV4 3.3V OUT4, VPV4 2.0V VFB4 0.54V VFB4 10Hz 100kHz; COUT4 3.3µF, IOUT4 10mA, VPV4 VOUT4 1.8V 1kHz, IOUT4 10mA, VPV4 VOUT4 1.8V 10kHz, IOUT4 10mA, VPV4 VOUT4 1.8V
Output Noise
µVRMS
PSRR
Internal Discharge Resistance Shutdown
low, resistance from OUT4 AGND
PMIC with Integrated Charger Smart Power Selector Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER REG5-LINEAR REGULATOR Operating Range Undervoltage Lockout Threshold Voltage Leakage Current Drop-Out Resistance Current Limit VPV5 VPV5 rising, 100mV hysteresis load VFB5 0.6V +25°C +85°C 1.55 0.582 1.60 0.600 0.45 0.75 VSYS 1.65 0.618 SYMBOL CONDITIONS UNITS
MAX8671X
VPV5 OUT5, VPV5 3.3V VPV5 OUT5, VPV5 2.0V VFB5 0.54V VFB5 10Hz 100kHz, COUT5 2.2µF, IOUT5 10mA, VPV5 3.5V, VOUT5 3.3V 1kHz, IOUT5 10mA, VPV5 3.5V, VOUT5 3.3V 10kHz, IOUT5 10mA, VPV5 3.5V, VOUT5 3.3V low, resistance from OUT5 AGND
Output Noise
µVRMS
PSRR
Internal Discharge Resistance Shutdown VL-LINEAR REGULATOR Voltage
VUSB 4.1V 6.6V, VSYS 2.6V 5.5V VUSB 4.1V 6.6V, VSYS 2.6V 5.5V VLOGIC 5.5V ISINK VLOGIC 5.5V +25°C +85°C +25°C +85°C
LOGIC (UOK, DOK, PEN1, PEN2, USUS, CEN, CST1, CST2, PWM) Logic Input-Voltage Logic Input-Voltage High Logic Input Leakage Current Logic Output-Voltage Logic Output-High Leakage Current TRI-STATE INPUT (BVSET) BVSET Input-Voltage BVSET Input-Voltage VUSB 4.1V 6.6V VUSB 4.1V 6.6V 0.001 0.01 0.001 0.01
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET, UOK, DOK, unconnected; VTHM VL/2, VPG_ VAGND VBAT low, USUS low, high, VPEN1 VPEN2 3.3V, VPWM COUT4 1µF, COUT5 1µF, CSYS 10µF, SYS, RDISET RCISET 0.1µF, 0.15µF, 0.01µF, VFB1 1.1V, VFB2 1.1V, VFB3 1.1V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER BVSET Input-Voltage High Internal BVSET Pullup Resistance External BVSET Pulldown Resistance Midrange Voltage RBVSET SYMBOL CONDITIONS VUSB 4.1V 6.6V 52.5 UNITS
Note Limits 100% production tested +25°C. Limits over operating temperature range guaranteed through correlation using statistical quality control (SQC) methods. Note USB/DC current limit does include output current. Linear Regulator section more information. Note Quiescent current excludes energy needed REG1-REG5 external resistor-dividers. typical operating characteristics include energy REG1-REG5 external resistor-dividers. circuit Figure typical quiescent current with unconnected, high, VBAT 175µA. Note charger transitions from done fast-charge mode this recharge threshold (Figure Note charger transitions from fast-charge top-off mode this top-off threshold (Figure Note maximum output current guaranteed correlation p-channel current-limit threshold, p-channel on-resistance, n-channel on-resistance, oscillator frequency, input voltage range, output voltage range. parameter stated 4.7µH inductor with 0.13 series resistance. Step-Down Converter Output Current section more information. Note step-down output voltages high with load load-line architecture. When calculating external resistor-dividers, voltage 1.000V. Note Line regulation step-down converters measured VOUT/D, where duty cycle (approximately VOUT/VIN). Note skip mode current threshold transition point between fixed-frequency operation skip mode operation. specification given terms output load current inductor values shown typical application circuits.
PMIC with Integrated Charger Smart Power Selector Handheld Devices
Typical Operating Characteristics
(Circuit Figure 0mA, +25°C, unless otherwise noted.)
QUIESCENT CURRENT SUPPLY VOLTAGE
MAX8671X toc01
MAX8671X
QUIESCENT CURRENT SUPPLY VOLTAGE
INPUT CURRENT (mA) FALLING RISING CHARGER ENABLED BATTERY INPUT VOLTAGE WITH OTHER INPUT LEFT UNCONNECTED
MAX8671X toc02
QUIESCENT CURRENT SUPPLY VOLTAGE, SUSPEND
0.45 0.40 CURRENT (mA) 0.35 0.30 0.25 0.20 0.15 0.10 0.05 VOLTAGE RISING
MAX8671X toc03
INPUT CURRENT (mA) RISING CHARGER ENABLED BATTERY INPUT VOLTAGE WITH OTHER INPUT LEFT UNCONNECTED FALLING
0.50
INPUT VOLTAGE
INPUT VOLTAGE
VOLTAGE
BATTERY LEAKAGE CURRENT BATTERY VOLTAGE WHEN REGULATORS POWERED FROM
MAX8671X toc04
BATTERY LEAKAGE CURRENT BATTERY VOLTAGE
BATTERY VOLTAGE EXTERNAL POWER HIGH
MAX8671X toc05
BATTERY LEAKAGE CURRENT VUSB PEN1 PEN2
BATTERY LEAKAGE CURRENT
BATTERY VOLTAGE
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Typical Operating Characteristics (continued)
(Circuit Figure 0mA, +25°C, unless otherwise noted.)
CHARGE CURRENT BATTERY VOLTAGE WITH INPUT
MAX8671X toc06
CHARGE CURRENT BATTERY VOLTAGE
CHARGE CURRENT (mA) VUSB 5.0V PEN1 PEN2 RCISET
MAX8671X toc07
CHARGE CURRENT (mA) PEN2 VUSB 5.0V PEN1 PEN2
RCISET 6.04k
BATTERY VOLTAGE
BATTERY VOLTAGE
CHARGE CURRENT AMBIENT TEMPERATURE, POWER DISSIPATION
MAX8671X toc08
CHARGE CURRENT AMBIENT TEMPERATURE, HIGH POWER DISSIPATION
MAX8671X toc09
BATTERY REGULATION VOLTAGE TEMPERATURE
4.45 4.40 BATTERY VOLTAGE 4.35 4.30 4.25 4.20 4.15 4.10 VUSB PEN1 PEN2 BVSET LOAD
MAX8671X toc10
CHARGE CURRENT (mA) PEN2 VUSB 5.0V VBAT 4.0V PEN1 PEN2
CHARGE CURRENT (mA) PEN2 VUSB 6.5V VBAT 3.1V PEN1 PEN2
4.50
4.05 4.00
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
VSYS CURRENT
MAX8671X toc11
VSYS CURRENT
MAX8671X toc12
VSYS CURRENT
MAX8671X toc13
4.10 4.05 4.00 VSYS
5.50
5.50
5.00
5.00
VSYS
3.95 3.90 3.85 3.80 1000 CURRENT (mA) OPEN, OPEN, VBAT 4.0V SLOPE SHOWS SYSTEM LOAD SWITCH ON-RESISTANCE 81m.
4.00
VSYS
4.50
4.50
4.00
3.50 OPEN, VUSB 5.1V, VBAT 4.0V PEN1 PEN2 CHARGER DISABLED 3.00 1000 CURRENT (mA)
3.50 OPEN, VUSB 5.1V, VBAT 4.0V PEN1 PEN2 CHARGER DISABLED 3.00 1000 CURRENT (mA)
PMIC with Integrated Charger Smart Power Selector Handheld Devices
Typical Operating Characteristics (continued)
(Circuit Figure 0mA, +25°C, unless otherwise noted.)
MAX8671X
CONNECT LOAD)
MAX8671X toc14
CONNECT (50mA LOAD)
MAX8671X toc15
DISCONNECT (50mA LOAD)
MAX8671X toc16
VUSB IUSB VSYS VUOK IBAT -475mA CHARGING 4.0V 4.14V
VUSB 5V/div 500mA/div IUSB 2V/div 5V/div VSYS VUOK IBAT 500mA/div +50mA -425mA CHARGING 4.0V 4.14V
5V/div VUSB 500mA/div IUSB 2V/div 4.14V VSYS 4.0V
5V/div
500mA/div 2V/div 5V/div
5V/div VUOK 500mA/div IBAT +50mA -425mA CHARGING
500mA/div
2ms/div LOAD SYS, 4.0V BATTERY, 5.0V INPUT
2ms/div 50mA LOAD SYS, 4.0V BATTERY, 5.0V INPUT
2ms/div 50mA LOAD SYS, 4.0V BATTERY, 5.0V INPUT
SUSPEND
MAX8671X toc17
RESUME
MAX8671X toc18
VUSB
5V/div
VUSUS
5V/div 500mA/div 4.14V 2V/div 5V/div 5V/div +50mA -425mA 500mA/div
IUSB VSYS VCST1 VCST2 +50mA IBAT -425mA 4.14V 4.0V
500mA/div 2V/div
IUSB VSYS 4.0V
5V/div 5V/div
VCST1 VCST2 IBAT
500mA/div
400s/div 50mA LOAD SYS, 4.0V BATTERY, 5.0V INPUT
400s/div 50mA LOAD SYS, 4.0V BATTERY, 5.0V INPUT
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Typical Operating Characteristics (continued)
(Circuit Figure 0mA, +25°C, unless otherwise noted.)
AC-TO-DC ADAPTER CONNECT WITH
MAX8671X toc20
AC-TO-DC ADAPTER CONNECT WITH
MAX8671X toc19
AC-TO-DC ADAPTER DISCONNECT WITH
MAX8671X toc21
VSYS
4.0V
4.14V
5V/div 500mA/div
VSYS
4.14V
2V/div 500mA/div
VSYS
4.14V
2V/div 500mA/div
IUSB IBAT -330mA
IUSB 500mA/div IBAT +160mA -840mA 500mA/div -840mA 400s/div LOAD SYS, PEN1 PEN2 HIGH LIMIT, RDISET 3.01k 400s/div LOAD SYS, PEN1 PEN2 HIGH LIMIT 500mA/div IBAT -840mA
500mA/div
+160mA
-330mA 500mA/div
20ms/div LOAD SYS, PEN1 PEN2 HIGH LIMIT
POWER-UP SEQUENCING
MAX8671X toc22
VOUT1 VOUT2
5V/div 5V/div 5V/div 2V/div
VOUT3 5V/div VOUT4 VOUT5 IUSB 4ms/div 50mA/div 5V/div 5V/div
PMIC with Integrated Charger Smart Power Selector Handheld Devices
Typical Operating Characteristics (continued)
(Circuit Figure 0mA, +25°C, unless otherwise noted.)
REG1 EFFICIENCY LOAD CURRENT
MAX8671X toc23
MAX8671X
REG1 LOAD REGULATION
MAX8671X toc24
REG1 DROPOUT VOLTAGE LOAD CURRENT
DROPOUT VOLTAGE (mV) NOMINAL INDUCTOR RESISTANCE 140m. NOMINAL p-CHANNEL RESISTANCE REGULATOR 200m 2.8V 185m 3.3V. SLOPE LINE SHOWS THAT TOTAL DROPOUT RESISTANCE AVERAGE PART, BOARD, INDUCTOR COMBINATION VOUT1 3.3V 330m 3.3V 354m VOUT1 2.8V 2.8V. 100mV BELOW REG1 NOMINAL REGULATION VOLTAGE.
MAX8671X toc25
EFFICIENCY VOUT1 2.8V VBATT VOUT1 2.8V
2.900 2.880 2.860 OUTPUT VOLTAGE 2.840 2.820 2.800 2.780 2.760 2.740 2.720 2.700 RFBH 182k RFBL 100k
1000
LOAD CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
REG1 LIGHT-LOAD SWITCHING WAVEFORMS (PWM
MAX8671X toc26
REG1 LIGHT-LOAD SWITCHING WAVEFORMS (PWM
MAX8671X toc27
REG1 HEAVY-LOAD SWITCHING WAVEFORMS
MAX8671X toc28
VOUT1
20mV/div VOUT1 (AC-COUPLED)
VOUT1 10mV/div 10mV/div (AC-COUPLED) VLX1 2V/div 20mA LOAD 200ns/div 400ns/div 100mA/div
VLX1
2V/div
VLX1
2V/div
20mA LOAD 4s/div
200mA/div
20mA LOAD
100mA/div
REG1 LINE TRANSIENT
MAX8671X toc29
REG1 LOAD TRANSIENT
MAX8671X toc30
5.3V VSYS 3.3V 3.3V 2V/div VOUT1 50mV/div (AC-COUPLED) 250mA
VOUT1 25mA LOAD 100s/div
20mV/div
IOUT1
25mA
25mA 100mA/div
20s/div
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Typical Operating Characteristics (continued)
(Circuit Figure 0mA, +25°C, unless otherwise noted.)
REG2 EFFICIENCY LOAD CURRENT
EFFICIENCY 1000 LOAD CURRENT (mA) VBATT 4.0V 1.40 OUTPUT CURRENT (mA) VOUT2 1.5V VOUT2 1.5V
MAX8671X toc31
REG2 LOAD REGULATION
MAX8671X toc32
1.60
OUTPUT VOLTAGE
1.55
1.50
1.45
REG3 EFFICIENCY LOAD CURRENT
MAX8671X toc33
REG3 LOAD REGULATION
1.28 1.26 OUTPUT VOLTAGE 1.24 1.22 1.20 1.18 1.16 1.14 RFBH RFBL 100k
MAX8671X toc34
EFFICIENCY VBATT 4.0V VOUT2 1.2V VOUT2 1.2V
1.30
1.12 1.10
1000
LOAD CURRENT (mA)
OUTPUT CURRENT (mA)
OUT3 LIGHT-LOAD SWITCHING WAVEFORMS (PWM
MAX8671X toc35
OUT3 HEAVY-LOAD SWITCHING WAVEFORMS
MAX8671X toc36
OUT3 LOAD TRANSIENT
MAX8671X toc37
VOUT1 20mV/div VOUT1 10mV/div VOUT1 100mV/div
VLX1
2V/div 10mA LOAD
VLX1
2V/div IOUT1 25mA
250mA
25mA 100mA/div
200mA/div
250mA LOAD
200mA/div
10s/div
400ns/div
40s/div
PMIC with Integrated Charger Smart Power Selector Handheld Devices
Typical Operating Characteristics (continued)
(Circuit Figure 0mA, +25°C, unless otherwise noted.) REG4 LOAD REGULATION
2.552 2.550 OUTPUT VOLTAGE 2.548 2.546 2.544 2.542 2.540 2.538 2.536 2.534 VSYS VOUT4 13.4 LOAD 100s/div 10mV/div IOUT4 50mA VPV4 VSYS VOUT4 2.5V 40s/div 150mA 50mA 100mV/div RFBH 316k RFBL 100k
MAX8671X toc38
MAX8671X
REG4 LINE TRANSIENT
MAX8671X toc39
REG4 LOAD TRANSIENT
MAX8671X toc40
2.554
5.3V VPV4 3.3V 3.3V
2V/div VOUT4 50mV/div
OUTPUT CURRENT (mA)
REG5 LOAD REGULATION
3.258 3.256 OUTPUT VOLTAGE 3.254 3.252 3.250 3.248 3.246 3.244 3.242 3.240 VUSB
MAX8671X toc41
REG5 LOAD TRANSIENT
MAX8671X toc42
3.260
VOUT5
50mV/div
150mA IOUT5 50mA VUSB VOUT5 3.3V 40s/div 50mA 100mV/div
OUTPUT CURRENT (mA)
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Description
NAME USUS OUT5 OUT4 FUNCTION Suspend Digital Input. shown Table driving USUS high suspends inputs they configured power input. Power Input. capable delivering SYS. supports both adaptors inputs. shown Table current limit controlled PEN1, PEN2, USUS, RDISET. Power Input. capable delivering 0.5A SYS. shown Table current limit controlled PEN1, PEN2, USUS. Feedback Input REG5. Connect center resistor voltage-divider from OUT5 AGND REG5 output voltage from 0.6V VPV5. Power Input REG5. Connect SYS, supply between 1.7V VSYS. Bypass power ground with ceramic capacitor. Linear Regulator Power Output. OUT5 internally pulled AGND shutdown. Power Ground REG2 Step-Down Regulator Inductor Switching Node REG2. internally pulled shutdown. Power Input REG2 Step-Down Regulator. Connect SYS. Bypass with 4.7µF ceramic capacitor. Active-Low Charger Enable Input. Pull enable charger, drive high disable charging. battery charger also disabled when USUS high. Feedback Input REG2. Connect center resistor voltage-divider from REG2 output capacitors AGND output voltage from VSYS. Active-Low, Open-Drain Power-OK Output. when within valid operating range. Feedback Input REG4. Connect center resistor voltage-divider from REG4 output capacitors AGND output voltage from 0.6V VPV4. Reference Noise Bypass. Bypass with low-leakage 0.01µF ceramic capacitor reduced noise outputs. Linear Regulator Power Output. OUT4 internally pulled AGND shutdown. Power Input REG4. Connect SYS, supply between 1.7V VSYS. Bypass power ground with ceramic capacitor. Battery Regulation Voltage Node. Drive BVSET regulation voltage 4.1V. Connect BVSET leave unconnected regulation voltage 4.2V. Connect BVSET AGND through resistor regulation voltage 4.350V. Ground. AGND low-noise ground connection internal circuitry. Feedback Input REG1. Connect center resistor voltage-divider from REG1 output capacitors AGND output voltage from VSYS. Regulator Enable Input. Drive high enable regulator outputs. sequencing shown Figure Drive disable regulators. Forced-PWM Input. Connect high forced-PWM operation REG1, REG2, REG3. Connect auto operation. change on-the-fly. section more information. Power Input REG1 Step-Down Regulator. Connect SYS. Bypass with 4.7µF ceramic capacitor.
BVSET AGND
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Description (continued)
NAME FUNCTION Inductor Switching Node REG1. internally pulled shutdown. Power Ground REG1 Step-Down Regulator Power Ground REG3 Step-Down Regulator Inductor Switching Node REG3. internally pulled shutdown. Power Input REG3 Step-Down Regulator. Connect SYS. Bypass with 4.7µF ceramic capacitor. Supply Output. output that powers MAX8671X internal battery-charger circuitry. provides 3.3V power external circuitry when present. Connect 0.1µF capacitor from AGND. Feedback Input REG3. Connect center resistor voltage-divider from REG3 output capacitors AGND output voltage from VSYS. Input Current-Limit Select Input. Connect resistor from DISET AGND (RDISET) current limit. Table more information. Charge Rate Select Input. Connect resistor from CISET AGND (RCISET) fast-charge current limit, prequalification-charge current limit, top-off threshold. Charge Timer Programming Node. Connect capacitor from AGND (CCT) time required fault occur fast-charge prequalification modes. Connect AGND disable fast-charge prequalification timers. Thermistor Input. Connect negative temperature coefficient (NTC) thermistor that good thermal contact with battery from AGND. Connect resistor equal thermistor resistance +25°C from Charging suspended when battery outside cold limits. Positive Battery Terminal Connection. Connect positive terminal single-cell Li+/Li-Poly battery. System Supply Output. Bypass power ground with 10µF ceramic capacitor. When valid voltage present suspended (USUS low), limited 5.3V (VSYS-REG). When system load (ISYS) exceeds input current limit, drops below VBAT VBSREG allowing both external power source battery service SYS. connected through internal system load switch (RBS) when valid source present PEN1 CST2 CST1 PEN2 Input Current-Limit Control Table more information. Open-Drain Charger Status Output CST1 CST2 indicate four different charger states. Table more information. Active-Low, Open-Drain Power-OK Output. when VUSB within valid operating range. Open-Drain Charger Status Output CST1 CST2 indicate four different charger states. Table more information. Input Current-Limit Control Table more information. Exposed Paddle. Connect exposed paddle AGND. Connecting exposed paddle does remove requirement proper ground connections AGND, PG1, PG2, PG3.
DISET CISET
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
AC-TO-DC ADAPTER 4.7F
VBUS 4.7F 3.3V 0.1F
4.7F
3380K 4.7H 0.6A
1.8V 180mA OUT4 2.2F 121k OUT2 1.0F
AGND
Li+/Li-Poly
MAX8671X
OUT4
2.8V 425mA OUT1 182k
60.4k 3.3V 180mA OUT5 274k 1.0F
100k 4.7F
OUT5
2.2F
60.4k
4.7H 0.6A
2.0V 425mA OUT2 100k 100k
4.7F
PEN1 PEN2 USUS 4.7H 0.6A
1.2V 425mA OUT3 100k
4.7F BVSET CST1 CST2 DISET CISET 0.15F 0.01F
560k
Figure MAX8671X Typical Application Circuit
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
DISET PEN1 PEN2 USUS SMART POWER SELECTOR Li+/Li-Poly BATTERY CHARGER SYSTEM LOAD SWITCH
BVSET
CST2 CST1
HIGHEST VOLTAGE SELECTOR CISET
3.3V
SMART POWER SELECTOR CHARGER BIAS
MAX8671X
AGND OUT4 REG4 REG1 DC-DC
REG2 DC-DC REG5
OUT5
REG3 DC-DC
Figure Functional Diagram
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Detailed Description
MAX8671X highly integrated PMIC ideally suited portable audio player handheld applications. shown Figure MAX8671X integrates power input, AC-to-DC adapter power input (DC), Li+/Li-Poly battery charger, three step-down regulators, linear regulators, various monitoring status outputs. MAX8671X offers adjustable output voltages outputs. When system load requirements exceed input current limit, battery supplies supplemental current load through internal system load switch. When battery connected there external power input, system (SYS) powered from battery. When external power input connected there battery, system (SYS) powered from external power input. dual-input Smart Power Selector supports products with dual single external power inputs. products with dual external power inputs, connect these inputs directly nodes MAX8671X. products with single input, connect single input node connect ground leave unconnected. addition AC-to-DC adapters current limits, input also supports current limit allow products
Smart Power Selector
MAX8671X Smart Power Selector seamlessly distributes power between current-limited external inputs (USB DC), battery (BAT), system load (SYS). basic functions performed are: With both external power supply (USB battery (BAT) connected: When system load requirements less than input current limit, battery charged with residual power from input.
Table Input Limiter Control Logic
POWER SOURCE PEN1 PEN2 USUS INPUT CURRENT LIMIT INPUT CURRENT LIMIT MAXIMUM CHARGE CURRENT* Lower ICHGMAX IDCLIM input off, input priority Lower ICHGMAX 100mA Lower ICHGMAX 500mA 100mA Lower ICHGMAX 100mA Lower ICHGMAX 500mA
AC-to-DC Adapter Input
IDCLIM
Power Input Power Input, Unconnected Unconnected
100mA
500mA Suspend
input
500mA Suspend input
*Charge current cannot exceed input current limit. Charge less than maximum charge current total load exceeds input current limit.
Don't care.
PMIC with Integrated Charger Smart Power Selector Handheld Devices
with single power input operate from either ACto-DC adapter host (see Table thermal-limiting circuit reduces battery charger rate external power-source current prevent MAX8671X from overheating. voltage below battery voltage, considered invalid. power input disconnected when voltage invalid. shown Table when power available input, priority over input. Bypass ground with least 4.7µF capacitor. support power sources input drive PEN2 USUS select between three internally USB-related current limits shown Table Choose 100mA low-power mode. Choose 500mA high-power mode. Choose suspend reduce current 0.11mA (typ) both suspend mode unconfigured mode. comply with specification, each device must initially configured power. After enumeration, device switch from power high power given permission from host. MAX8671X does perform enumeration. expected that system communicates with host commands MAX8671X through PEN1, PEN2, USUS inputs. When load exceeds input current limit, drops 82mV below battery supplies supplemental load current. MAX8671X reduces current limit 5%/°C when temperature exceeds +100°C. system load (ISYS) priority over charger current, input current first reduced lowering charge current. junction temperature still reaches +120°C spite charge current reduction, input current drawn from USB; battery supplies entire load regulated below VBSREG. Note that this on-chip thermal-limiting circuit related operates independently from thermistor input. power input required, connect ground leave unconnected. When both inputs powered, input priority.
MAX8671X
System Load Switch internal (RBS) MOSFET connects when voltage source available USB. When external source detected USB, this switch opened powered from valid input source through Smart Power Selector. When system load requirements exceed input current limit, battery supplies supplemental current load through internal system load switch. system load continuously exceeds input current limit, battery does charge, even though external power connected. This expected occur most cases because high loads usually occur only short peaks. During these peaks, battery energy used, other times battery charges. Power Input (USB) current-limited power input that supplies system (SYS) 500mA. switch linear regulator designed operate dropout. This linear regulator prevents voltage from exceeding 5.3V. typically connected VBUS line universal serial (USB) interface. shown Table supports three different current limits that with PEN2 USUS digital inputs. These current limits ideally suited with power. operating voltage range 4.1V 6.6V, tolerate without damage. When input voltage below undervoltage threshold (VUSBL, typ) considered invalid. Similarly, voltage above overvoltage threshold (VUSBH, 6.9V typ) considered invalid. When
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Power-OK Output (UOK) shown Figure power-OK output (UOK) active-low open-drain output. output pulls when voltage from AGND USB) between VUSBH (typically 6.9V) VUSBL (typically 4.0V). power-OK circuitry remains active thermal overload suspend. power-OK output feature required, connect ground leave unconnected. Suspend (USUS) shown Table driving USUS high suspends inputs they configured power input. suspend current 110µA when USUS driven high allowing MAX8671X comply with 1.1/2.0 specification suspend well specification unconfigured device. external input (USB connected MAX8671X suspended, node supported battery. DOK, UOK, circuits remain active suspend mode.
common assumption that REG5 disabled suspend. This true. REG5 affected suspend mode. While suspend, device must provide 3.3V termination transceivers' pullup resistors. This 3.3V termination come from MAX8671X's output REG5. Both remain enabled suspend.
Power Input (DC) current-limited power input that supplies system (SYS) DC-to-SYS switch linear regulator designed operate dropout. This linear regulator prevents voltage from exceeding 5.3V. shown Table supports four different current limits that with PEN1, PEN2, USUS digital inputs. These current limits ideally suited with AC-to-DC wall adapters power. operating voltage range 4.1V 6.6V, tolerate without damage. When input voltage below undervoltage threshold typ), considered invalid. Similarly, voltage above overvoltage threshold (VDCH, 6.9V typ), considered invalid. When voltage below battery voltage, considered invalid. power input disconnected when voltage invalid. shown Table when power available input, priority over input. Bypass ground with least 4.7µF capacitor.
MAX8671X
VUSBL 4.0V RISING (typ) 500mV HYST UNDERVOLTAGE
OVERVOLTAGE VUSBH 6.9V RISING (typ) 400mV HYST AGND
Figure Power-OK Logic
PMIC with Integrated Charger Smart Power Selector Handheld Devices
support common 500mA 1000mA wall adapters input, pull PEN1 high. With PEN1 pulled high, current limit external resistor from DISET AGND (RDISET). Choose RDISET based current capability AC-to-DC adapter (IADPTR) follows: RDISET 2000 1.5V IADPTR
MAX8671X
Table Current Limit Standard Values RDISET
RDISET 3.01 3.09 3.16 3.24 3.32 3.40 3.48 3.57 3.65 3.74 3.83 3.92 4.02 4.12 4.22 IDCLIM (mA) RDISET 4.32 4.42 4.53 4.64 4.75 4.87 4.99 5.11 5.23 5.36 5.49 5.62 5.76 5.90 6.04 IDCLIM (mA)
selected value RDISET, calculate current limit (IDCLIM) follows (Table Figure 1.5V IDCLIM 2000 RDISET support power sources input, pull PEN1 low. With PEN1 low, drive PEN2 USUS select between three internally USB-related current limits shown Table Choose 100mA lowpower mode. Choose 500mA high-power mode. Choose suspend reduce current 0.11mA (typ) both suspend mode unconfigured mode. comply with specification, each device must initially configured power. After enumeration, device switch from power high power given permission from host. When load exceeds current limit, drops below VBSREG battery supplies supplemental load current. power input required, connect ground leave unconnected. MAX8671X reduces current limits 5%/°C when temperature exceeds +100°C. system load (ISYS) priority over charger current, input current first reduced lowering charge current. junction temperature still reaches +120°C spite charge-current reduction, input current drawn from battery supplies entire load regulated below VBSREG. Note that this on-chip thermal-limiting circuit related operates independently from thermistor input.
INPUT CURRENT LIMIT INPUT CURRENT-LIMIT RESISTOR
1000 PEN1 HIGH IDCLIM (mA)
RDISET
Figure Programming Current Limit
Power-OK Output (DOK) shown Figure power-OK output (DOK) open-drain, active-low output. output pulls when voltage from AGND (VDC) between (typically 6.9V) (typically 4.0V).
power-OK circuitry remains active thermal overload suspend. power-OK output feature required, connect ground leave disconnected.
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
MAX8671X
VDCL 4.0V RISING (TYP) 500mV HYST UNDERVOLTAGE
OVERVOLTAGE VDCH 6.9V RISING (TYP) 400mV HYST AGND
Figure Power-OK Logic
Battery Charger
Figure shows typical Li+/Li-Poly charge profile MAX8671X, Figure shows battery charger state diagram. With valid and/or input, battery charger initiates charge cycle when charger enabled. first detects battery voltage. battery voltage less than prequalification threshold (3.0V), charger enters prequalification mode which battery charges maximum fast-charge current while deeply discharged. Once battery voltage rises 3.0V, charger transitions fast-charge mode applies maximum charge current. charging continues, battery voltage rises until approaches battery regulation voltage (selected with BVSET) where charge current starts tapering down. When charge current decreases maximum fast-charge current, charger enters brief top-off state then charging stops. battery voltage subsequently drops below battery regulation voltage VBATRCHG, charging restarts timers reset. battery charge rate several factors: Battery voltage USB/DC input current limit Charge setting resistor, RCISET System load (ISYS) temperature
MAX8671X automatically reduces charge current prevent input overload. MAX8671X also reduces charge current when thermal regulation (see Thermal Limiting Overload Protection section more information).
Battery Regulation Voltage (BVSET)
BVSET allows maximum battery charge voltage 4.1V, 4.2V, 4.350V. Drive BVSET regulation voltage 4.1V. Connect BVSET leave unconnected regulation voltage 4.2V. Connect BVSET AGND through resistor BVSET regulation voltage 4.350V. RBVSET accuracy critical. resistor acceptable.
Charge Enable Input (CEN)
digital input. Driving high disables battery charger. does affect current limit. Driving USUS high also disables battery charger when charging from source (PEN1 low). many systems, there need system controller (typically microprocessor (µP)) disable charger because MAX8671X independently manages charger power path. these situations, connected ground. leave unconnected.
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
PREQUALIFICATION FAST-CHARGE (CONSTANT CURRENT) FAST-CHARGE (CONSTANT VOLTAGE) TOP-OFF DONE
VBATREG BATTERY VOLTAGE
VBATPRQ
ICHGMAX
BATTERY CHARGE CURRENT
HIGH-Z CST[1:2] CST[1:2] CST[1:2]
SIMPLICITY, THIS FIGURE ASSUMES THAT ISYS
Figure Li+/Li-Poly Charge Profile
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
ICHGMAX 2000 1.5V RCISET INPUT POWER [1:2] ICHG INVALID
AND/OR INVALID
STATE
CHARGER DISABLED CST[1:2] AND/OR ICHG THERMISTOR SUSPEND ICHG CST[1:2] AND/OR RANGE SUSPENDS TIMER USUS SETS TIMER
USUS
tPREQUAL PREQUALIFICATION CST[1:2] AND/OR ICHG ICHGMAX/10 VBAT 2.82V SETS TIMER VBAT 3.0V SETS TIMER tFST-CHG FAST-CHARGE CST[1:2] AND/OR WITHIN RANGE RESUMES TIMER ICHG ICHGMAX SETS TIMER ICHG ICHGMAX VBAT 4.2V SETS TIMER ICHG ICHGMAX VBAT VBATREG RESUMES TIMER ICHG ICHGMAX VBAT VBATREG EXTENDS TIMER TIMER EXTEND [1:2] (ISET 20%) ICHG (ICHGMAX 50%) VBAT (VBATREG VBATRCHG) SETS TIMER ICHG ICHGMAX VBAT VBATREG SUSPENDS TIMER
WITHIN RANGE RESUMES TIMER
TIMER FAULT [1:2] ICHG AND/OR
THERMISTOR SUSPEND ICHG CST[1:2] AND/OR
RANGE SUSPENDS TIMER
RANGE
TOP-OFF CST[1:2] AND/OR VBAT VBATREG
THERMISTOR SUSPEND ICHG CST[1:2] AND/OR
WITHIN RANGE DONE CST[1:2] AND/OR (VBATREG VBATRCHG) VBAT VBATREG ICHG
ICHG ICHGMAX VBAT VBATREG RESUMES TIMER
TIMER SUSPEND [1:2] ICHG (ICHGMAX 20%)
Figure Charger State Diagram
Charge Status Outputs (CST1, CST2)
CST1 CST2 open-drain charger status outputs. Their function shown Table Figure When MAX8671X used with pull CST1 CST2 system logic voltage with resistors indicate
charge status Alternatively, CST1 CST2 sink 20mA each charge indicators. charge status output feature required, connect CST1 CST2 ground leave them unconnected.
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Table Charge Status Outputs
CST1 CST2 CHARGING STATE Prequalification fast charge Thermistor suspend Timer fault input power top-off done
Table Charge Times
(nF) (min) 15.0 22.0 33.0 48.4 103.4 (min) 100% 2068 (min) 1320 1936 4136
Note: CST1 CST2 active-low, open-drain outputs. indicates that output device pulling low. indicates that output high impedance.
Charge Timer (CT)
shown Figure fault timer prevents battery from charging indefinitely. prequalification fastcharge modes, timer controlled capacitance (CCT). MAX8671X supports values from 0.01µF 1µF. Calculate prequalification fast-charge times follows (Table Figure 0.15F 0.15F When charger exits fast-charge mode, fixed top-off mode entered: While constant-current fast-charge mode (Figure MAX8671X reduces battery charge current internal temperature large system loads, slows down charge timer. This feature eliminates nuisance charge timer faults. When battery charge current between 100% programmed fast-charge level, fast-charge timer runs full speed. When battery charge current between programmed fast-charge level, fast-charge timer slowed Similarly, when battery charge current below programmed fast-charge level, fast-charge timer paused. fast-charge timer slowed paused when charger constant voltage portion fast-charge mode (Figure where charge current reduces normally.
CHARGE, PREQUALIFICATION, TOP-OFF CURRENT CHARGE SETTING RESISTOR
1000 ICHGMAX
CURRENT (mA)
RCISET
Figure Programming Charge Current
Connect AGND disable prequalification fast-charge timers. With internal timers MAX8671X disabled, external device, such control charge time through input.
Setting Charger Currents (CISET)
shown Table Figure resistor from CISET ground CISET sets maximum fastcharge current (ICHGMAX), charge current prequalification mode (IPQ), top-off threshold (ITO). MAX8671X supports values CHGMAX from 200mA 1000mA. Select RCISET follows: RCISET 2000 1.5V ICHGMAX
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Table Ideal Charge Currents Charge Setting Resistor
RCISET 3.01 4.02 4.99 6.04 6.98 8.06 9.09 10.0 11.0 12.1 13.0 14.0 15.0 ICHGMAX (mA) 1000 (mA) (mA)
DISCHARGING BATTERY CHARGING CURRENT 1.5V 2000 CISET VCISET
MONITORING BATTERY CHARGE CURRENT WITH VCISET
VCISET RCISET IBAT 2000
Figure Monitoring Battery Charge Current with Voltage from CISET AGND
Determine ICHGMAX considering characteristics battery. necessary limit charge current based capabilities expected AC-toDC adapter charging input, system load, thermal limitations PCB. MAX8671X automatically lowers charging current necessary accommodate these factors. selected value RCISET, calculate ICHGMAX, IPQ, follows: ICHGMAX 2000 1.5V RCISET
directly CISET that exceeds 10pF. filtering charge current monitor necessary, include resistor 100k more between CISET filter capacitor preserve charger stability.
Step-Down Converters (REG1, REG2, REG3)
REG1, REG2, REG3 high-efficiency 2MHz current-mode, step-down converters with adjustable outputs. Each REG1, REG2, REG3 step-down converter delivers least 425mA. step-down regulator power inputs (PV_) must connected SYS. step-down regulators operate with from 2.6V 5.5V. Undervoltage lockout ensures that step-down regulators operate with below 2.6V (typ). Enable/Disable (EN) Sequencing section enable disable step-down converters. When enabled, MAX8671X gradually ramps each output during soft-start time. Soft-start eliminates input current surges when regulators enabled. section information about stepdown converters control scheme.
ICHGMAX ICHGMAX addition setting charge current, CISET also provides means monitor battery charge current. CISET output voltage tracks charge current delivered battery, used monitor charge rate, shown Figure 1.5V output indicates battery being charged maximum fast-charge current, indicates charging. This voltage also used charger control circuitry monitor battery current. Avoid adding capacitance
PMIC with Integrated Charger Smart Power Selector Handheld Devices
MAX8671X uses external resistor-dividers step-down output voltages between VSYS. least 10µA bias current these dividers ensure change stability closed-loop system. output voltage, select value resistor connected between AGND (RFBL). recommended value 100k. Next, calculate value resistor connected from output (RFBH): RFBH RFBL 1.0V REG1, REG2, REG3 optimized high, medium, output voltages, respectively. highest overall efficiency occurs with highest output voltage lowest output voltage. reduces switching noise controller. impedance input capacitor switching frequency must less than that source impedance supply that high-frequency switching currents pass through input source. step-down regulator power inputs critical discontinuous current paths that require careful bypassing. layout, place step-down regulator input bypass capacitors close possible each pair switching regulator power input pins (PV_ PG_) minimize parasitic inductance. making connections these caps through vias, sure multiple vias ensure that layout does insert excess inductance resistance between bypass power pins. input capacitor must meet input ripple current requirement imposed step-down converter. Ceramic capacitors preferred their resilience power-up surge currents. Choose input capacitor that temperature rise input ripple current does exceed about +10°C. step-down DC-DC converter, maximum input ripple current half output current. This maximum input ripple current occurs when step-down converter operates duty factor (VIN VOUT). Bypass each step-down regulator input with 4.7µF ceramic capacitor from PG_. capacitors that maintain their capacitance over temperature bias. Ceramic capacitors with temperature characteristic generally perform well. capacitor voltage rating should 6.3V greater.
MAX8671X
MAX8671X operates either auto-PWM forcedPWM modes. light load, auto switches only needed supply load improve light-load efficiency step-down converter. higher load currents (~100mA), step-down converter transitions fixed 2MHz switching. Forced always operates with constant 2MHz switching frequency regardless load. This useful low-noise applications. Permanently connect high forced-PWM applications auto-PWM applications. change on-the-fly. Step-Down Dropout Minimum Duty Cycle step-down regulators capable operating 100% duty-cycle dropout; however, REG1 been optimized this mode operation. During 100% duty-cycle operation, high-side p-channel MOSFET turns constantly, connecting input output through inductor. dropout voltage (VDO) calculated follows: ILOAD where:
p-channel power switch RDS(ON) external inductor minimum duty cycle step-down regulators 12.5% (typ), allowing regulation voltage over full operating range. REG3 optimized duty-cycle operation.
Step-Down Input Capacitors input capacitor step-down converter reduces current peaks drawn from power source
Step-Down Output Capacitors output capacitance keeps output ripple small ensures control loop stability. output capacitor must have impedance switching frequency. Ceramic, polymer, tantalum capacitors suitable, with ceramic exhibiting lowest lowest high-frequency impedance. MAX8671X requires least 20µF output capacitance, which best achieved with 10µF ceramic capacitors parallel. case sizes ceramic surface-mount capacitors decrease, their capacitance bias voltage characteristic becomes poor. this characteristic, possible 0805 capacitors perform well while 0603 capacitors same value might not. MAX8671X requires nominal output capacitance 20µF; however, after their bias voltage derating, output capacitance must least 15µF.
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Step-Down Inductor Choose step-down regulator inductance 4.7µH. minimum recommended saturation current requirement 600mA. mode, peak inductor currents equal load current plus half inductor ripple current. MAX8671X works well with physically small inductors. Table suggested inductors.
peak-to-peak inductor ripple current during operation calculated follows: VOUT IP-P VSYS where 2MHz switching frequency. peak inductor current during operation calculated follows: PEAK ILOAD where: VOUT output voltage IOUTTAR target (desired) output current-cannot more than minimum p-channel current-limit threshold n-channel on-resistance p-channel on-resistance external inductor's input voltage-MAXIMUM following equation calculate maximum output current (IOUTMAX): ILIM IOUTMAX where: ILIM p-channel current-limit threshold-MINIMUM VOUT output voltage approximate duty cycle derived from step oscillator frequency-MINIMUM external inductor's inductance-MINIMUM n-channel on-resistance external inductor's
Step-Down Converter Output Current three MAX8671X step-down regulators each provide least 425mA output current when using recommended inductor (Table calculate maximum output current particular application inductor following two-step process shown Figure 10): following equation calculate approximate duty cycle (D):
OUTTAR IOUTTAR
Table Suggested Inductors
MANUFACTURER Sumida Taiyo Yuden TOKO SERIES CDRH2D11HP CDH2D09 NR3012 NR3010 VLF3012 VLF3010 DE2812C DE2810C INDUCTANCE (µH) CURRENT RATING (mA) DIMENSIONS (mm) 10.8mm3 9.0mm3 10.8mm3 9.0mm3 8.7mm3 7.3mm3 10.8mm3 8.4mm3
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
FIND MAXIMUM OUTPUT CURRENT REG3 WITH 3.2V 5.3V, VOUT 1.2V, 4.7H ±20%, 130m 1.2V 0.425A(0.12 0.13) 0.249 OUTTAR IOUTTAR 5.3V 0.425A(0.12 0.23) 1.2V(1- 0.249) 0.555A ILIM (1.8 106Hz) (4.7 10-6 0.8) 0.482A IOUTMAX 0.249 (0.12 0.13) (1.8 106Hz) (4.7 10-6 0.8)
Figure Step-Down Converter Maximum Output Current Example
Linear Regulators (REG4, REG5)
REG4 REG5 linear regulators have quiescent current, output noise. Each regulator supplies 180mA load. Bypass each output with 2.2µF greater capacitor ground. less than 1.5V, bypass output with 3.3µF greater. Each linear regulator independent power input (PV4 PV5) with input voltage range from 1.7V VSYS (VSYS 5.5V). Voltages below input undervoltage lockout threshold (1.6V) invalid. regulator inputs driven from efficient low-voltage source, such DC-DC output, optimize efficiency (see following equation). Bypass each input with greater capacitor ground: EfficiencyLDO REG5 intended power system transceiver circuitry only active when power available. REG4 powered from battery when power available USB. Enable/Disable (EN) Sequencing section enable disable linear regulators. When enabled, linear regulators soft-start ramping their outputs their target voltage 3ms. Softstart limits inrush current when regulators enabled. MAX8671X uses external resistor-dividers output voltages between 0.6V VPV_. least 10µA bias current these dividers ensure change stability closed-loop system. output voltage, select value resistor connected between AGND (RFBL). recom-
mended value 60.4k. Next, calculate value resistor connected from output (RFBH): RFBH RFBL 0.6V REG4, external 0.01µF bypass capacitor from AGND conjunction with 150k internal resistor creates 110Hz lowpass filter noise reduction. high-impedance node requires low-leakage capacitor. example, leakage 40nA results error.
Linear Regulator
output 3.3V linear regulator that powers MAX8671X internal circuitry. internally powered from higher automatically powers when either these power inputs exceeds approximately 1.5V. When higher supply between 1.5V 3.3V, operates dropout. automatically powers down when both power inputs removed. Bypass AGND with 0.1µF capacitor. remains even when and/or overvoltage undervoltage lockout, when undervoltage lockout, also during thermal faults. sources external loads. used external loads, MAX8671X's USB/DC current limit guarantees compliance with input current specifications. used external loads, USB/DC currents increase might exceed limits outlined specification. example, current limited 95mA sourcing 3mA, IUSB 98mA. Similarly, input suspended sourcing 3mA, IUSB 3mA.
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
SYSOK 2.5V FALLING 100mV HYST TEMP PV4OK 1.6V RISING 100mV HYST PV5OK 1.6V RISING 100mV HYST USBOVLO 6.9V RISING 400mV HYST REGON USBPOK SOFT-START USBUVLO 4.0V RISING 500mV HYST DCOVLO 6.9V RISING 400mV HYST DCUVLO 4.0V RISING 500mV HYST SOFT-START REGON REG3OK REG1OK BIAS CYCLE DELAY (32ms) REG2OK DT165 SYSOK SOFT-START REGON REGON REG3OK REG1OK REG2OK REG4OK PV5OK REG5OK REG5 PV4OK REG4OK REG4 DCPOK REGON REG3OK REG1 REG1OK SOFT-START REG3 REG3OK DT165
MAX8671X
+165°C
SOFT-START REG2 REG2OK
2MHz
Figure Enable/Disable Logic
Enable/Disable (EN) Sequencing
Figures show five MAX8671X regulators enabled disabled. With valid voltage temperature, asserting high enables REG1-REG4. Pulling disables
REG1-REG5. REG5 intended power system transceiver circuitry, which only active when power available. Therefore, valid source must either input REG5 enable.
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
VUSB
VBAT VSYS (VUSB VDC) VSYS VBAT VBAT
VOUT1
tSS1
VOUT2 VOUT3 tSS3
tSS2
tSS4
VOUT4
VOUT5
tSS5
VUOK
HIGH-Z
INTERNAL DISCHARGE RESISTORS HIGH-Z
VDOK
HIGH-Z
HIGH-Z
Figure Enable Disable Waveforms
regulator controlled powered from higher automatically powers when either power inputs exceeds approximately 1.5V. Similarly, automatically powers down when both power inputs removed.
Soft-Start/Inrush Current
MAX8671X implements soft-start many levels control inrush current, avoid collapsing supply volt-
ages, fully comply with specifications. USB, charging functions implement soft-start. nodes only require 4.7µF input capacitance. Furthermore, regulators implement soft-start avoid transient overload power inputs (Figure 12).
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Active Discharge Shutdown
Each MAX8671X regulator (REG1-REG5) internal resistor that discharges output capacitor when regulator off. discharge resistors ensure that load circuitry powers down completely. internal discharge resistors connected when regulator disabled when device UVLO with input voltage greater than 1.0V. With input voltage less than 1.0V, internal discharge resistors activated. range. When voltage less than UVLO threshold (4.0V typ), input disconnected from SYS, goes high impedance. When voltage less than UVLO threshold (4.0V typ), input disconnected from SYS, goes high impedance. addition, when both UVLO, battery charger disabled, connected through internal system load switch. REG1-REG4 allowed operate from battery without power REG5 intended power system transceiver circuitry, which only active when power available. Therefore, valid source must present either input REG5 enable.
Undervoltage Overvoltage Lockout
USB/DC UVLO Undervoltage lockout (UVLO) prevents input supply from being used when voltage below operat-
UNPLUGGING WITH NOTHING DISCHARGE CUSB (VBAT 3.3V). 3.3V UNPLUG EVENT RAPID DISCHARGE UNTIL VUSB DECAYS HIGHER 3.5V VBAT 5OmV VUSB 3.5V SLOW DISCHARGE MAX8671X DRAWS QUIESCENT CURRENT
HIGH-Z VUOK tDDREG5 120s (typ)
VBAT 3.4V, VPV5 WILL REGULATE 3.3V VBAT 3.4V, VPV5 WILL SLIGHTLY LESS THAN VBAT (DROPOUT)
Figure REG5 Disable Detail
PMIC with Integrated Charger Smart Power Selector Handheld Devices
USB/DC OVLO Overvoltage lockout (OVLO) prevents input supply from being used when voltage exceeds operating range. Both withstand input voltages 14V. When voltage greater than OVLO threshold (6.9V typ), input disconnected from SYS, goes high impedance. When voltage greater than OVLO threshold (6.9V typ), input disconnected from SYS, goes high impedance. addition, when both OVLO, battery charger disabled, connected through internal system load switch. REG1-REG4 allowed operate from battery when overvoltage lockout. supply remains active OVLO. REG5 intended power system transceiver circuitry, which only active when power available. valid source must present either input REG5 enable. UVLO UVLO circuit monitors voltage from ground (VSYS). When VSYS falls below VUVLO_SYS (2.5V typ), REG1-REG5 disabled. UVLO_SYS 100mV hysteresis. supply remains active UVLO. REG4/REG5 UVLO UVLO circuit monitors power inputs. When voltage below 1.6V, invalid disabled. Smart Power Selector Thermal-Overload Protection MAX8671X reduces current limits 5%/°C when temperature exceeds +100°C. system load (ISYS) priority over charger current, input current first reduced lowering charge current. junction temperature still reaches +120°C spite charge-current reduction, input current drawn from battery supplies entire load regulated 82mV (VBSREG) below BAT. Note that this on-chip thermal-limiting circuit related operates independently from thermistor input. Regulator Thermal-Overload Shutdown MAX8671X disables regulator outputs (except when junction temperature rises above +165°C, allowing device cool. When junction temperature cools approximately 15°C, regulators resume state indicated enable input (EN) repeating their soft-start sequence. Note that this thermal-overload shutdown fail-safe mechanism; proper thermal design should ensure that junction temperature MAX8671X never exceeds absolute maximum rating +150°C. Battery Charger Thermistor Input (THM) input connects external negative temperature coefficient (NTC) thermistor monitor battery system temperature. Charging suspended when thermistor temperature range. Additionally, charge timers suspended charge status indicators report that charger thermistor suspend (CST[1:2] 01). When thermistor comes back into range, charging resumes charge timer continues from where left off. Table shows temperature limits various thermistor material constants. battery temperature monitor required, bias midway between AGND with resistive divider-100k resistors recommended. Biasing midway between AGND bypasses this function.
MAX8671X
Thermal Limiting Overload Protection
MAX8671X packaged 0.8mm 40-pin thin QFN. Table shows thermal characteristics this package. MAX8671X several mechanisms control junction temperature event thermal overload.
Table 0.8mm Thin Thermal Characteristics
SINGLE-LAYER Continuous Power Dissipation 1777.8mW Derate 22.2mW/°C above +70°C 45°C/W 1.7°C/W MULTILAYER 2857.1mW Derate 35.7mW/°C above +70°C 28°C/W 1.7°C/W
specified according JESD51 standard.
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Table Trip Temperatures Different Thermistors
THERMISTOR BETA [K]) Resistance +25°C Resistance +50°C Resistance Nominal Trip Temperature [°C] Nominal Cold Trip Temperature [°C] 3000 Open Short 4.59 25.14 3250 Open Short 4.30 27.15 3500 Open Short 4.03 29.32 3750 Open Short 3.78 31.66 4250 Open Short 3.32 36.91 4250 Short 3.32 36.91
ALTERNATE THERMISTOR CONFIGURATION
0.74
COLD TEMPERATURE SUSPEND
DIODE
0.284
AGND
BOTH COMPARATORS HAVE 65mV HYSTERESIS
MAX8671X
Figure Thermistor Input
Since thermistor monitoring circuit employs external bias resistor from (RTB Figure 14), resistance thermistor used long value equivalent thermistor's +25°C resistance. example, with +25°C thermistor, RTB, with 100k +25°C thermistor, 100k general relation thermistor resistance temperature defined following equation:
where: resistance ohms thermistor temperature Celsius resistance ohms thermistor +25°C material constant thermistor that typically ranges from 3000K 5000K temperature thermistor that corresponds
PMIC with Integrated Charger Smart Power Selector Handheld Devices
threshold adjustment accommodated changing RTB, connecting resistor series and/or parallel with thermistor, using thermistor with different material constant example, +45°C threshold cold threshold realized using thermistor with 4250K connecting 120k parallel. Since thermistor resistance near much higher than near +50°C, large parallel resistance lowers cold threshold, while only slightly lowering threshold. Conversely, small series resistance raises cold threshold, while only slightly raising threshold. Raising lowers both cold thresholds, while lowering raises both thresholds.
MAX8671X
VIEW
8671XE TLyww aaaa
THIN 0.8mm
Figure Package Marking Example
Layout Routing
Good printed circuit board (PCB) layout necessary achieve optimal performance. Refer MAX8671 evaluation Maxim's recommended layout. following guidelines best results: short wide traces high-current discontinuous current paths. step-down regulator power inputs critical discontinuous current paths that require careful bypassing. Place step-down regulator input bypass capacitors close possible each switching regulator power input pair (PV_ PG_). Minimize area loops formed stepdown converters' dynamic switching currents. exposed paddle (EP) main path heat exit Connect ground plane with thermal vias allow heat dissipate from device. MAX8671X regulator feedback nodes sensitive high-impedance nodes. Keep these nodes short possible away from inductors. thermistor node high impedance should routed with care. Make power ground connections power ground plane. Make analog ground connections analog ground plane. Connect ground planes single point.
REG4 high-performance with high PSRR noise care should used layout obtain high performance. Generally, REG4 powered from stepdown regulator output, therefore, input capacitor should bypassed power ground plane. However, output capacitor should bypassed analog ground plane. high impedance node leakage current into affect output accuracy.
Package Marking
MAX8671X package laser etched shown Figure "8671XETL" product identification code. full part number MAX8671XETL; however, this case, "MAX" prefix omitted space limitations. "yww" date code. last number Gregorian calendar year. "ww" week number Gregorian calendar. example: "801" first week 2008; week January 1st, 2008 "052" fifty-second week 2010; week December 27th, 2010. "aaaa" assembly code code. denotes lead-free packaging marks location.
Chip Information
PROCESS: BiCMOS
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Configuration
DISET AGND BVSET OUT4 OUT5
VIEW
CISET PEN1 CST2 CST1 PEN2 USUS
MAX8671X
EXPOSED PADDLE (EP)
THIN 0.8mm
PMIC with Integrated Charger Smart Power Selector Handheld Devices
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
MAX8671X
THIN.EPS
PMIC with Integrated Charger Smart Power Selector Handheld Devices MAX8671X
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2007 Maxim Integrated Products registered trademark Maxim Integrated Products. Inc.

PMIC with Integrated Charger Smart Power Selector Handheld Devices

Top Searches for this datasheet

Other recent searches