12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX

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12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX

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19-1679; 3/04
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with
MAX8880/MAX8881 ultra-low supply current, low-dropout linear regulators, capable delivering 200mA. They designed battery-powered applications where reverse battery protection long battery life critical. These regulators' 3.5µA supply current extends battery life applications with long standby periods. Unlike PNP-based designs, PMOS device maintains ultralow supply current throughout entire operating range dropout. parts internally protected from output short circuits, reverse battery connection, thermal overload. internal power-OK (POK) comparator indicates when output regulation. MAX8880 output adjustable from 1.25V using external resistor-divider. MAX8881 provides only factory-preset output voltages 1.8V, 2.5V, 3.3V, (see Ordering Information). devices available 6-pin SOT23 6-pin TDFN packages. 3.5µA Supply Current Reverse Battery Protection 2.5V Input Voltage Range ±1.5% Output Voltage Accuracy 200mA Output Current PMOS Output Device Short-Circuit Thermal Overload Protection Output Out-of-Regulation Indicator Fixed 1.8V, 2.5V, 3.3V, (MAX8881) Adjustable from 1.25V (MAX8880) Tiny 6-Pin SOT23 Package Thin 6-Pin TDFN Package
Features
MAX8880/MAX8881
_Applications
Smoke Detectors Battery-Powered Alarms Remote Transmitters Smart Battery Packs PDAs Handy Terminals CMOS Backup Power Real-Time Clocks
Configurations
VIEW
SHDN
Typical Operating Circuit
2.5V VOUT 1.25V 200mA 4.7µF
MAX8880 MAX8881
SHDN
MAX8880
MAX8881
REGULATION SHDN
TDFN
SOT23-6
Ordering Information
PART MAX8880EUT-T MAX8880ETT-T MAX8881EUT18-T MAX8881EUT25-T MAX8881EUT33-T MAX8881EUT50-T OUTPUT Adjustable Adjustable 1.8V 2.5V 3.3V 5.0V TEMP. RANGE -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C PIN-PACKAGE SOT23-6 TDFN SOT23-6 SOT23-6 SOT23-6 SOT23-6 MARK AAHR AAHS AAHT AAHU AAHV
Maxim Integrated Products
free samples latest literature, visit www.maxim-ic.com phone 1-800-998-8800. small orders, phone 1-800-835-8769.
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX8881
ABSOLUTE MAXIMUM RATINGS
.-14V +14V SHDN .-0.3V (VIN 0.3V), -0.3V +0.3V when OUT, GND.-0.3V when 5.7V, -0.3V (VIN 0.3V) when 5.7V, -0.3V +0.3V when .-0.3V +14V Continuous Current.200mA Short Circuit.Indefinite Continuous Power Dissipation +70°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C).696mW 6-Pin TDFN (derate 24.4mW/°C above +70°C) .1951mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature.-65°C +165°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 VOUT SHDN COUT 4.7µF, -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Input Voltage Range Supply Current Shutdown Supply Current Input Undervoltage Lockout Voltage, Adjustable Mode SYMBOL IIN(SHDN) VUVLO MAX8880, IOUT 20mA +25°C +85°C -40°C +85°C +25°C +85°C -40°C +85°C Voltage Range Line Regulation Load Regulation (Note Current Limit (Note Dropout Voltage (Notes Reverse Leakage Current Foldback Current Limit SHDN Input Threshold SHDN Input Bias Current Input Bias Current Trip Threshold Hysteresis Off-Current Voltage IPOK VPOK VPOK 12V, +25°C IPOK IOUT IIN(REV) IOUT(SC) IOUT 50mA -12V, SHDN VOUT 2.5V SHDN 12V, +25°C 1.25V, +25°C, MAX8880 only Falling +25°C -40°C +85°C -100 87.5 90.5 93.5 VOUT MAX8880 VOUT IOUT 10µA 100mA 1.238 1.232 1.219 -1.5 1.25 0.01 0.006 SHDN 12V, VOUT +25°C CONDITIONS 1.257 1.276 1.282 1.295 0.05 0.015 %/mA VOUT UNITS
Voltage Accuracy (Note
MAX8881, IOUT 20mA
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with
ELECTRICAL CHARACTERISTICS (continued)
(VIN VOUT SHDN COUT 4.7µF, -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Thermal Shutdown Threshold Noise SYMBOL TTSD CONDITIONS (Hysteresis 15°C) UNITS µVRMS
MAX8880/MAX8881
VOUT(NOISE) 10Hz 100kHz, IOUT
Note Note Note Note
devices 100% production tested +25°C. temperature limits guaranteed design. Output accuracy with respect nominal preset voltages. OUT. This specification valid dropout voltage defined VOUT when VOUT 100mV below value VOUT VOUT
Typical Operating Characteristics
(VIN VOUT 3.3V, IOUT 30mA, COUT 4.7µF, +25°C, unless otherwise noted. Figure
SUPPLY CURRENT INPUT VOLTAGE
MAX8880/1-01
SUPPLY CURRENT TEMPERATURE
SUPPLY CURRENT (µA) VOUT 1.8V
MAX8880/1-02
DROPOUT VOLTAGE LOAD CURRENT
DROPOUT VOLTAGE (mV) -40°C +25°C +85°C
MAX8880/1-03
SUPPLY CURRENT (µA) LOAD IOUT
INPUT VOLTAGE
TEMPERATURE (°C)
LOAD CURRENT (mA)
POWER-SUPPLY REJECTION RATIO FREQUENCY
MAX8880/1-04
OUTPUT NOISE SPECTRAL DENSITY FREQUENCY
MAX186-14A
OUTPUT NOISE LOAD CURRENT
OUTPUT NOISE (µVRMS) VOUT 1.8V COUT 4.7µF COUT 1.0µF
MAX8880/1-06
NOISE (µV/Hz)
PSRR (dB)
0.10
0.01 FREQUENCY (Hz) 100k FREQUENCY (Hz)
LOAD CURRENT (mA)
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX8881
Typical Operating Characteristics (continued)
(VIN VOUT 3.3V, IOUT 30mA, COUT 4.7µF, +25°C, unless otherwise noted. Figure SUPPLY CURRENT OUTPUT VOLTAGE ERROR OUTPUT VOLTAGE LOAD CURRENT LOAD CURRENT INPUT VOLTAGE
MAX8880/1-08
OUTPUT VOLTAGE ERROR -0.1 -0.2 -0.3 -0.4 -0.5 -0.6
MAX8880/1-07
3.00 OUTPUT VOTLAGE 2.50 2.00 1.50 1.00 0.50
SUPPLY CURRENT (µA)
LOAD CURRENT (mA) LOAD CURRENT (mA)
INPUT VOLTAGE
CHANGE FROM NOMINAL OUTPUT VOLTAGE TEMPERATURE
0.15 0.10 0.05 -0.05 -0.10 -0.15 -0.20 TEMPERATURE (°C) COUT
MAX8880/1-10
REGION STABLE COUT OUTPUT CURRENT
MAX8880/1-11
LINE-TRANSIENT RESPONSE
MAX8880/1-12
0.20 CHANGE FROM NOMINALOUTPUT VOLTAGE
COUT 10µF
COUT 4.7µF
STABLE REGION 200µs/div VIN, 500mV/div, COUPLED VOUT, 20mV/div, COUPLED VOUT IOUT
OUTPUT CURRENT (mA)
LOAD-TRANSIENT RESPONSE
MAX8880/1-13
LOAD-TRANSIENT RESPONSE NEAR DROPOUT
MAX8880/1-14
TURN-ON RESPONSE
MAX8880/1-15
32.5mA
32.5mA
1.25mA
1.25mA
400µs/div IOUT, 12.5mA/div VOUT, 100mV/div, COUPLED VOUT(NOMINAL)
400µs/div IOUT, 12.5mA/div VOUT, 100mV/div, COUPLED 5.2V, VOUT(NOMINAL) SHDN, 2V/div VOUT, 1V/div 4.0V
100µs/div
MAX8880/1-09
3.50
9.75V
1.8V
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with
Description
MAX888_ (SOT) MAX888_ (TDFN) NAME FUNCTION Input Voltage. Bypass with capacitor GND. Ground Output Voltage. Bypass with 4.7µF capacitor (<0.5 ESR) load currents 200mA. load currents 40mA, acceptable. Feedback Point, 1.25V (MAX8880 only). Output sense, connect externally (MAX8881 only). ON/OFF Control. Regulator when SHDN unused, connect reverse battery protection SHDN input desired, connect 100k resistor series with SHDN. Output, Open Drain. when regulation shutdown. Connect through high-value resistor simple error indicator. Exposed paddle (TDFN only). Connect circuit ground plane.
MAX8880/MAX8881
SHDN
Detailed Description
MAX8880/MAX8881 low-dropout, low-quiescent current linear regulators designed primarily battery-powered applications (Figure MAX8880 provides adjustable output voltage from 1.25V using external resistor-divider. MAX8881 available factory preset output voltages 1.8V, 2.5V, 3.3V, Both devices have +1.25V reference, error amplifier, MOSFET driver, P-channel pass transistor (Figure
Low-Dropout Regulator
1.25V reference connected error amplifier's inverting input. error amplifier compares this reference with selected feedback voltage amplifies difference. MOSFET driver reads error signal applies appropriate drive Pchannel pass transistor. feedback voltage lower than reference voltage, pass-transistor gate
2.5V
pulled lower, allowing more current pass, increasing output voltage. feedback voltage higher than reference voltage, pass-transistor gate driven higher, allowing less current pass output. output voltage back through either internal resistor voltage divider externally connecting (MAX8881), external resistor network connected (MAX8880). Additional blocks include output current limiter, reverse battery protection, thermal sensor, shutdown logic, comparator indicate when output regulation (Figure
Internal P-Channel Pass Transistor
MAX8880/MAX8881 feature P-channel MOSFET pass transistor. This provides advantages over similar designs using pass transistors, including longer battery life. P-channel MOSFET requires base drive, which reduces quiescent current considerably. PNP-based regulators waste considerable current dropout when pass transistor saturates. They also high base-drive currents under large loads. MAX8880/MAX8881 suffer from these problems consume only 3.5µA supply current (see Typical Operating Characteristics).
VOUT 100k 4.7µF
MAX8881
REGULATION SHDN
Dropout Voltage
regulator's minimum input-output differential dropout voltage) determines lowest usable supply voltage. battery-powered systems, this determines useful end-of-life battery voltage. Because MAX8880/MAX8881 P-channel MOSFET pass transistor, their dropout voltage RDS(ON) multiplied load current (see Electrical Characteristics).
*OPTIONAL
Figure Standard Application Circuit
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX8881
SHDN REVERSE BATTERY PROTECTION
ERROR SHUTDOWN LOGIC
DRIVER WITH ILIMIT
MAX8881
THERMAL SENSOR 1.25V
Figure Functional Diagram
Current Limiting
2.5V 4.7µF VOUT 1.25V 5.5V 200mA
MAX8880/MAX8881 include current limiter. When output shorted ground, drive output PMOS limited. output shorted ground without damage part.
MAX8880
SHDN REGULATION
Thermal Overload Protection
Thermal overload protection limits total power dissipation MAX8880/MAX8881. When internal junction temperature exceeds +160°C, thermal sensor signals shutdown logic, turning pass transistor allowing cool. thermal sensor turns pass transistor again after IC's junction temperature cools 15°C, resulting pulsed output during continuous thermal-overload conditions. Thermal-overload protection designed protect MAX8880/MAX8881 event fault conditions. continuous operation, exceed absolute maximum junction temperature rating TJ(MAX) +150°C.
Figure Adjustable Output Using External Feedback Resistors
Reverse Battery Protection
MAX8880/MAX8881 have unique protection scheme that limits reverse supply current less than when forced below ground. circuit monitors polarity disconnecting internal circuitry parasitic diodes when battery reversed. This feature prevents device from electrical stress damage when battery connected backwards. reverse battery protection needed, drive SHDN through 100k resistor.
Operating Region Power Dissipation
MAX8880/MAX8881's maximum power dissipation depends thermal resistance case circuit board, temperature difference between junction ambient air, rate airflow. power dissipation device VOUT). maximum power dissipation allowed
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX8881
PMAX
(MAX
where TJ(MAX) +150°C, ambient temperature, thermal resistance from junction case, thermal resistance from case through board, copper traces, other materials surrounding air.
output Connect MAX8881's proper operation. MAX8880 features adjustable output voltage from 1.25V 5.5V, using external resistors connected voltage-divider (Figure output voltage following equation: VOUT where typically 1.257V. Choose 1.2M optimize quiescent current, accuracy, high-frequency power-supply rejection. simplify resistor selection: total current through external resistive feedback load resistors should greater than 1µA. Since tolerance typically less than ±1.5%, output using fixed resistors instead trim pots.
Output
open-drain output useful simple error flag, well delayed reset output. sinks current when output voltage below regulation point. Connect through high-value resistor simple error flag indicator. Connect capacitor parallel with resistor produce delayed signal (delay time constant). during regulation shutdown high impedance during normal operation.
Applications Information
Capacitor Selection Regulator Stability
MAX8880/MAX8881 designed stable with output filter capacitor high general purposes, capacitor device's input 4.7µF capacitor output. Larger input capacitor values lower provide better supply-noise rejection transient response. higher value input capacitor (10µF necessary) large, fast transients anticipated device located several inches from power source. large output capacitors improve loadtransient response, stability, power-supply rejection. Note that some ceramic dielectric materials (e.g., Y5V) exhibit large temperature coefficient both capacitance ESR, larger output capacitance needed ensure stability temperatures. 4.7µF output capacitor with dielectrics should sufficient stable operation over full temperature range, with load currents 200mA. load currents 40mA, acceptable. graph Region Stable Output Current shown Typical Operating Characteristics.
Power-Supply Rejection Operation from Sources Other than Batteries
MAX8880/MAX8881 designed deliver lowdropout voltages quiescent currents batterypowered systems. Power-supply rejection -66dB frequencies rolls with frequencies above 100Hz. high frequencies, output capacitor major contributor rejection power-supply noise (see Power-Supply Rejection Ratio Frequency Typical Operating Characteristics). When operating from sources other than batteries, improve supply-noise rejection transient response increasing value input output capacitors using passive filtering techniques. MAX8880/MAX8881 load-transient response graphs (see Typical Operating Characteristics) show output response changing load current. Reduce overshoot increasing output capacitor's value 10µF reducing ESR.
Chip Information
TRANSISTOR COUNT:
Output Voltage Selection
MAX8881 features preset output voltage. Internal precision feedback resistors MAX8881EUT18 output 1.8V, MAX8881EUT25 output 2.5V, MAX8881EUT33 output 3.3V, MAX8881EUT50
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX8881
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
6LSOT.EPS
PACKAGE OUTLINE, SOT-23,
21-0058
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX8881
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.) &10L, THIN.EPS
INDEX AREA
C0.35 [(N/2)-1] REF.
DETAIL
SEMICONDUCTOR
PROPRIETARY INFORMATION TITLE:
DALLAS
PACKAGE OUTLINE, 10L, TDFN, EXPOSED PAD, 3x3x0.80
NUMBER LEADS SHOWN REFERENCE ONLY
APPROVAL DOCUMENT CONTROL REV.
21-0137
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX8881
Package Information (continued)
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
COMMON DIMENSIONS SYMBOL MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
0.25 MIN. 0.20 REF.
PACKAGE VARIATIONS PKG. CODE T633-1 T833-1 T1033-1 1.50±0.10 1.50±0.10 1.50±0.10 2.30±0.10 2.30±0.10 2.30±0.10 0.95 0.65 0.50 JEDEC SPEC MO229 WEEA MO229 WEEC MO229 WEED-3 0.40±0.05 0.30±0.05 0.25±0.05 [(N/2)-1] 1.90 1.95 2.00
SEMICONDUCTOR
PROPRIETARY INFORMATION TITLE:
DALLAS
PACKAGE OUTLINE, 10L, TDFN, EXPOSED PAD, 3x3x0.80
APPROVAL DOCUMENT CONTROL REV.
21-0137
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 2004 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with MAX8880/MAX

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