Linear Battery Charger with Test Mode TDFN MAX8922L linear batter
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19-4929; 9/09
Linear Battery Charger with Test Mode TDFN
MAX8922L linear battery charger safely charges single-cell lithium-ion (Li+) battery. Charging rate optimized accommodate thermal characteristics given application. There need reduce maximum charge current worst-case charger power dissipation. Charging optimized single cell using control algorithm that includes low-battery precharging, voltage current-limited fast charging, top-off charging, while continuously monitoring input overvoltage device die-temperature conditions. fast-charge current top-off current thresholds programmable simple 1-Wire® serial interface. charger status valid input power indicated open-drain outputs (CHG POK). fast-charge current defaulted 400mA programmable through 1-Wire interface (EN/SET). MAX8922L also programmable test mode through 1-Wire interface. MAX8922L available tiny (3mm 0.8mm) 10-pin TDFN package.
Features
Overvoltage-Protected 30VDC Rated Input (IN) Input Overvoltage-Protected Safe 4.94V Output 2.3A Test Mode External FET, Blocking Diode, Sense Resistor Required 1-Wire Easy Programmable Fast-Charge Test Mode (EN/SET) Resistor-Programmable Fast-Charge Current (SETI) Resistor-Programmable Top-Off Current Threshold (MIN) Prequalification Charge Power-OK Monitor Output (POK) Charging-Status Output (CHG) Temperature Regulation Optimized Charge Rate Tiny (3mm 0.8mm) 10-Pin TDFN Package
MAX8922L
Applications
GSM/EDGE/UMTS/CDMA Cell Phones Digital Cameras PDAs Portable Media Players Players Wireless Appliances
Ordering Information
PART MAX8922LETB+T PIN-PACKAGE TDFN-EP* MARK
+Denotes lead(Pb)-free RoHS-compliant package. Exposed pad.
Note: This device operates -40°C +85°C extended operating temperature range.
Configuration
Typical Operating Circuit
USB/AC ADAPTER 4.45V
VIEW
EN/SET
TEST
SETI RSETI
MAX8922L
SETI
RMIN
MAX8922L
SYSTEM SUPPLY
EN\SET TEST
TDFN (3mm 0.8mm)
EXPOSED PAD.
1-Wire registered 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.
Linear Battery Charger with Test Mode TDFN MAX8922L
ABSOLUTE MAXIMUM RATINGS
.-0.3V +30V BAT, CHG, EN/SET, POK, SETI, MIN, LDO, TEST .-0.3V Continuous Power Dissipation +70°C) 10-Pin (3mm 2mm) TDFN (derate 14.9mW/°C above +70°C) .1188.7mW Operating Temperature Range .-40°C +85°C Junction Temperature Range .-40°C +150°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
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
(VIN VBAT VEN/SET -40°C +85°C, typical values +25°C, unless otherwise noted.) (Note
PARAMETER Input Voltage Range Input Voltage Operating Range Input Undervoltage Threshold (UVLO) Input Overvoltage Threshold (OVP) Input Supply Current IN-to-BAT On-Resistance IN-to-BAT Comparator Threshold Regulation Voltage Battery Removal Detection Threshold IBAT 100mA VBAT rising Hysteresis Default fast-charge current, VBAT 3.5V EN/SET pulse with 4ms, RSETI one-pulse mode, VBAT 3.5V EN/SET pulses with 4ms, VBAT 3.5V EN/SET three pulses with 4ms, VBAT 3.5V (Note Soft-Start Time Precharge Threshold Precharge Current Leakage Current VBAT 4.2V Ramp time fast-charge current VBAT rising, 300mV hysteresis (typ) +25°C -40°C +85°C 4.179 4.158 4.67 2350 4.221 4.242 (Note rising, 500mV hysteresis (typ) rising, 200mV hysteresis (typ) IBAT 0mA, charge mode VEN/SET standby mode VBAT, shutdown mode 4.15V, VBAT rising falling 4.45 3.80 3.90 0.35 4.00 1300 CONDITIONS UNITS
Charging Current
Linear Battery Charger with Test Mode TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN VBAT VEN/SET -40°C +85°C, typical values +25°C, unless otherwise noted.) (Note
PARAMETER Minimum Bypass Capacitance Regulated Output Voltage Output-Current Limit EN/SET Logic Input Thresholds Program Lock Time Shutdown Delay tLOW tHIGH Pulldown Resistor POK, Logic Output Voltage, Logic Output Current, High Default top-off threshold, hysteresis (typ) 80mA Top-Off Threshold IBAT falling, battery charged EN/SET pulse, RMIN 1.875k, hysteresis (typ) 130mA EN/SET pulses, hysteresis (typ) 22mA Detection Delay THERMAL LOOP Thermal-Limit Temperature Thermal-Limit Gain Junction temperature when charge current reduced, rising Reduction IBAT increase default mode +105 mA/°C IBAT falls below top-off threshold IPOK, ICHG VPOK VCHG 5.5V, +25°C +85°C 0.05 0.001 0.01 EN/SET from high (Note (Note Rising Falling 1400 1400 ILDO 10mA, 4.94 CONDITIONS UNITS
MAX8922L
Note Limits 100% production tested +25°C. Limits over operating temperature range guaranteed design characterization. Note Guaranteed undervoltage- overvoltage-threshold testing. VBAT 4.2V, needs 4.2V 250mV (typ) start normal operation. After MAX8922L turns operate until VBAT 100mV (typ). complete charging, input voltage must 4.45V. Input Sources section. Note Used factory calibration. 217Hz, 12.5% current pulse, +25°C. continuous charge current. Note tested. Design guidance only.
Linear Battery Charger with Test Mode TDFN MAX8922L
Typical Operating Characteristics
(VIN VEN/SET VBAT MAX8922L Evaluation Kit. +25°C, unless otherwise noted.)
DISABLED SUPPLY CURRENT SUPPLY VOLTAGE
MAX8922 toc02 MAX8922 toc01
SUPPLY CURRENT SUPPLY VOLTAGE
SUPPLY CURRENT (mA) SUPPLY VOLTAGE STANDBY SUPPLY CURRENT (mA)
CHARGE CURRENT BATTERY VOLTAGE
500mA SETI MODE CHARGE CURRENT (mA) 90mA PRESET 400mA PRESET
MAX8922 toc03
SUPPLY VOLTAGE
BATTERY VOLTAGE
CHARGE CURRENT SUPPLY VOLTAGE
CHARGE CURRENT (mA) SUPPLY VOLTAGE IBAT 400mA DEFAULT VBAT
MAX8922 toc04
CHARGE CURRENT WITH EN/SET PULSE
MAX8922 toc05
CHARGE CURRENT WITH EN/SET PULSES
MAX8922 toc06
5V/div VEN/SET 500mA 400mA VEN/SET
5V/div
400mA
100mA/div 1ms/div IBAT 1ms/div
100mA/div
TRANSIENT RESPONSE
MAX8922 toc07
CHARGE CURRENT INPUT VOLTAGE HEADROOM
CHARGE CURRENT (mA) 200mv/div AC-COUPLED IFAST-CHARGE 677mA
MAX8922 toc08
BATTERY CBAT 68µF VBAT
IBAT
1A/div 1ms/div
VBAT (mV)
Linear Battery Charger with Test Mode TDFN
Typical Operating Characteristics (continued)
(VIN VEN/SET VBAT MAX8922L Evaluation Kit. +25°C, unless otherwise noted.)
MAX8922L
REGULATION VOLTAGE ACCURACY AMBIENT TEMPERATURE
MAX8922 toc09
CHARGE CURRENT AMBIENT TEMPERATURE
MAX8922 toc10
CHARGE CURRENT AMBIENT TEMPERATURE CHARGE)
CHARGE CURRENT (mA) RSETI 1.5kI VBATT
MAX8922 toc11
VBAT REGULATION ACCURACY -0.2 -0.4 -0.6 -0.8 -1.0 BATTERY
CHARGE CURRENT (mA) 400mA PRESET VBATT
1000
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
Description
NAME FUNCTION Input Supply. Connect (VIN VBAT) 250mV charging source. Bypass with larger ceramic capacitor. Charge-Current Program Fast-Charge Current Monitor. Output current from SETI 1000µA ampere battery-charging current. charging current connecting resistor (RSETI Figure from SETI GND. IFAST-CHARGE 1500V/RSETI. Connect pulse mode (external SETI) used. Ground 4.94V Regulated Output with Input Overvoltage Protection. Bypass with larger ceramic capacitor. used supply low-voltage-rated systems. Top-Off Current Threshold Programmable Input. IMIN 150V/RMIN. Connect pulse mode (external SETI) used. Active-Low Enable Input. EN/SET used programming fast-charge current test mode. detailed descriptions, Charger-Enable Program Input (EN/SET) section. Factory Test Input. Connect GND. Charging-Status Output. internally pulled when charger prequalification fastcharge mode. high impedance when charger top-off disabled. Input Power-OK Monitor. open-drain output that internally pulled when greater than VUVLO lower than VOVP VBAT 250mV. high impedance when less than VUVLO greater than VOVP VBAT 100mV. Battery Connection. delivers charging current monitors battery voltage using BAT. Bypass with 2.2µF larger ceramic capacitor. high impedance when disabled. Exposed Pad. Connect plane increased thermal dissipation.
SETI EN/SET TEST
Linear Battery Charger with Test Mode TDFN MAX8922L
MAX8922
4.45V
Tj(DIE) CC/CV REGULATOR +105°C CONTROL
3.9V
TOP-OFF SWITCH 7.5V
FAST-CHARGE SWITCH
CHARGE LOGIC CONTROL
RMIN
SETI
EN/SET
RSETI
PRECHARGE
2.5V
TEST
Figure MAX8922L Functional Diagram
Linear Battery Charger with Test Mode TDFN
Detailed Description
MAX8922L designed charge single-cell battery from source voltage between 4.45V while withstand 30V. fast-charge current top-off current thresholds programmable with EN/SET, SETI, MIN.
Soft-Start
prevent input transients, rate change charge current limited when charger turned changes current compliance. takes approximately 250µs (typ) (tSOFTSTART) charger from maximum fast-charge current.
MAX8922L
Charger-Enable Program Input (EN/SET)
EN/SET active-low logic input that enables charger. Drive EN/SET high longer than disable charger-control circuitry. EN/SET left unconnected, internal pulldown resistor enables 400mA fast-charge current default. pulse programming scheme shown Table Figure used program charge current test mode. There four different fast-charge current states. Default fast-charge current state 400mA mode. More than three pulses interpreted 90mA mode. After programming locked, MAX8922L ignores pulses until disabled/enabled input power cycled. Each fast-charge state locked after logic-low asserted EN/SET, followed programming pulses. However, during default mode, EN/SET does receive pulses, charger stays default mode unlocked indefinitely.
Thermal-Limit Control
MAX8922L features thermal limit that reduces charge current when temperature exceeds +105°C. temperature increases above +105°C, decreases charge current 28mA/°C.
Charge-Indicator Output (CHG)
open-drain output that indicates charger status. goes during charging prequalification fast-charge mode. internal open-drain MOSFET turns when charge current reaches top-off threshold. status latched after top-off threshold reached. latch reset follows: Disable re-enable MAX8922L. Input power cycled. Battery-charge current increases greater than top-off threshold hysteresis. When MAX8922L used conjunction with microprocessor, connect pullup resistor between logic voltage indicate charge status Alternatively, sink more charge indicator.
Debounce Timer
prevent MAX8922L from charging battery momentarily upon power-up with EN/SET held low, (typ) debounce timer delays charging loop upon power-up. EN/SET logic-low unconnected (pulled down internal pulldown resistor) during power-up, charger starts charging battery after VUVLO VOVP VBAT 250mV VIN. EN/SET logic-high during power-up, charger does charge battery.
Table Charge-Current Pulse Settings
CHARGE CURRENT DEFAULT NUMBER PULSES LOGIG-LOW IBAT (mA) 400mA Three Four more FAST-CHARGE CURRENT SETTING SETI, resistor programmable 90mA 2.3A (GSM test) 90mA
Linear Battery Charger with Test Mode TDFN MAX8922L
CHARGER LOOP DEFAULT OFF; EN/SET UPON POK. CHARGER LOOP ACTIVATES AFTER DEBOUNCE ASYNCHRONOUS FROM ANYWHERE tEN/SET HIGH VUVLO VOVP VBAT 250mV
STANDBY MODE CHARGER HIGH IMPEDANCE
SHUTDOWN CHARGER HIGH IMPEDANCE HIGH IMPEDANCE
EN/SET
VUVLO VOVP VBAT 100mV
ASYNCHRONOUS FROM ANYWHERE VUVLO VOVP VBAT 100mV
VBAT 2.5V
PREQUALIFICATION PRECHARGE CURRENT
PULSE MODE DOES HAVE PRECHARGE STATE
(VOVP VUVLO) (VIN VBAT) 250mV
VBAT 2.2V
VBAT 2.5V
FAST CHARGE (PULSE PROGRAMMABLE) 100% CHARGER CURRENT
ICHG ITOP-OFF HYSTERESIS ICHG ITOP-OFF
FULL BATTERY VBAT 4.2V HIGH IMPEDANCE
FULL BATTERY CONTINUES REGULATE VBAT 4.2V
Figure Charger State Diagram
Power-OK Indicator (POK)
MAX8922L contains open-drain output that goes when greater than VUVLO lower than VOVP exceeds battery voltage 250mV. Once charging started, charging sustained with
inputs 3.5V, long input voltage remains above battery voltage least 100mV. status should maintained even though charger disabled EN/SET. When VOVP, high impedance.
Linear Battery Charger with Test Mode TDFN MAX8922L
HIGH IMPEDANCE
PULL
tHIGH TIME LIMIT tSOFTSTART 90mA MODE PULSES LOW) 400mA SETTING (DEFAULT) IFAST TEST MODE PULSES LOW) tLOW SETI MODE PULSE LOW)
Figure Charge-Current Programming
Output
preset output voltage 4.94V 100mA current limit (typ). powered from input overvoltage protection. valid input present (VUVLO VOVP). Bypass with larger ceramic capacitor. used supply low-voltagerated systems.
voltage ISET nominally 1.5V selected fast-charge current decreases with charging current cell becomes fully charged thermal-regulation circuitry activates.
Applications Information
Fast-Charge Current Settings pulse mode, maximum charging current programmed external resistor connected from SETI (RSETI). Calculate RSETI follows: RSETI 1500V/IFAST-CHARGE where FAST-CHARGE amperes SETI ohms. SETI used monitor fast-charge current level one-pulse mode (RSETI mode). output current from SETI 1000µA ampere charging current. output voltage SETI proportional charging current (ICHARGE) when SETI mode used fast-charge current: VSETI ICHARGE RSETI/1000
Top-Off Current Settings top-off charging current programmed external resistor connected from (RMIN) one-pulse mode (RSETI mode). Calculate RMIN follows:
RMIN 150V/IMIN where IMIN amperes RMIN ohms.
Capacitor Selection
Connect 2.2µF ceramic capacitor from proper stability. Connect ceramic capacitor from GND. larger input bypass capacitor high charging currents reduce supply noise. capacitors should dielectric better. aware that some capacitors have large-voltage coefficients, should avoided.
Linear Battery Charger with Test Mode TDFN MAX8922L
ADAPTER
1.87k
2.2µF VI/O 4.2V SYSTEM VBUS
MAX8922L
SETI EN/SET TEST GPIO GPIO GPIO
Figure Adapter Charger Application
Thermal Considerations
MAX8922L thermally enhanced TDFN package with exposed pad. Connect exposed package large copper ground plane provide thermal contact between device circuit board. exposed transfers heat away from device, allowing charge battery with maximum current, while minimizing increase temperature.
Recommended Layout Routing
Place bypass capacitors close possible Connect battery close possible provide accurate battery voltage sensing. Provide large copper ground plane allow exposed sink heat away from device. Make high-current traces short wide minimize voltage drops. sample layout available MAX8922L Evaluation speed designs.
Input Sources
MAX8922L operates from well-regulated sources. charger input voltage range 4.45V device survives input voltages without damage input voltage greater than 7.5V (typ), stops charging. appropriate power supply must provide least 4.2V plus voltage drop across internal-pass transistor when sourcing desired peak charging current. VIN(MIN) 4.2V IFAST-CHARGE(MAX) where input-to-BAT resistance. Failure meet this requirement results incomplete charge increased charge time.
Typical Application Circuits
Adapter Charge Figure shows MAX8922L battery charger with adapter. MAX8922L detects presence input supply resulting pulled low. Once pulled low, MAX8922L begins charging battery when EN/SET unconnected. system program charge current EN/SET pulses. monitoring CHG, system detect top-off threshold terminate charge through EN/SET. MAX8922L also provides overvoltageprotected 4.94V output low-voltage-rated system input.
Linear Battery Charger with Test Mode TDFN MAX8922L
CABLE 1.87k VI/O 2.2µF 4.2V SYSTEM VBUS
MAX8922L
SETI EN/SET TEST GPIO GPIO GPIO
Figure USB-Powered Battery-Charger Application
Charge universal serial (USB) provides high-speed serial communications port well power remote device. MAX8922L configured charge single battery highest current possible from host port. Figure shows MAX8922L battery charger. microprocessor enumerates host determine current capability. system program charge current 90mA, SETI 400mA EN/SET pulses host port capable. MAX8922L also provides overvoltage-protected 4.94V output low-voltage-rated system input.
Test Mode Figure shows MAX8922L test mode. sending three pulses EN/SET, MAX8922L goes into test mode. pull 2.3A 576µs once every 217Hz from MAX8922L's output. configuration Figure used system development, testing, calibrations production design stage.
Linear Battery Charger with Test Mode TDFN MAX8922L
CABLE
1.87k
68µF VI/O SYSTEM VBUS
MAX8922L
SETI EN/SET TEST GPIO GPIO GPIO
Figure Test Mode
Chip Information
PROCESS: BiCMOS
Linear Battery Charger with Test Mode TDFN
Package Information
latest package outline information land patterns, www.maxim-ic.com/packages. Note that "+", "#", package code indicates RoHS status only. Package drawings show different suffix character, drawing pertains package regardless RoHS status. PACKAGE TYPE TDFN-EP PACKAGE CODE T1032N-1 DOCUMENT 21-0429
MAX8922L
TDFN.EPS
Linear Battery Charger with Test Mode TDFN MAX8922L
Package Information (continued)
latest package outline information land patterns, www.maxim-ic.com/packages. Note that "+", "#", package code indicates RoHS status only. Package drawings show different suffix character, drawing pertains package regardless RoHS status.
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 2009 Maxim Integrated Products Maxim registered trademark Maxim Integrated Products, Inc.
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