12V, Ultra-Low Low-Dropout Linear Regulators MAX1725/MAX1726 ultr

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12V, Ultra-Low Low-Dropout Linear Regulators MAX1725/MAX1726 ultr

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12V, Ultra-Low Low-Dropout Linear Regulators
MAX1725/MAX1726 ultra-low supply current, low-dropout linear regulators intended low-power applications that demand longest possible battery life. Unlike inferior PNP-based designs, MAX1725/ MAX1726s' PMOS pass elements maintain ultra-low supply current throughout their entire operating range dropout. Despite their ultra-low power consumption, MAX1725/MAX1726 have tight output accuracy (1.5%) require just output capacitance achieve good load-transient response. These regulators have wide input voltage range (+2.5V +12V), making them excellent choices systems powered from lithium-ion (Li+) cells batteries. Other features include reverse-battery protection, short-circuit protection, thermal protection. MAX1725 provides adjustable 1.5V output using external resistor-divider. MAX1726 provides factory preset 1.8V, 2.5V, 3.3V, output voltages (see Ordering Information). Both devices available miniature 5-pin SOT23 package. Supply Current Reverse-Battery Protection +2.5V +12V Input Voltage Range Fixed 1.8V, 2.5V, 3.3V, Output Voltages (MAX1726) Adjustable 1.5V Output Voltages (MAX1725) 20mA Guaranteed Output Current 1.5% Output Voltage Accuracy Small Output Capacitor Short-Circuit Protection Thermal Protection Tiny 5-Pin SOT23 Package
Features
MAX1725/MAX1726
_Applications
Smoke Detectors Remote Transmitters Smart Battery Packs Industrial Control Systems Microcontroller Power Real-Time Clock Backup Power PDAs Handy-Terminals Battery-Powered Alarms
PART MAX1725EUK-T MAX1726EUK25-T MAX1726EUK33-T MAX1726EUK5-T
Ordering Information
TEMP. RANGE -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C PINPACKAGE SOT23-5 SOT23-5 SOT23-5 SOT23-5 SOT23-5 MARK ADNK ADNL ADNM ADNN ADNO
MAX1726EUK18-T -40°C +85°C
Note: Selector Guide MAX1725/MAX1726 output options they relate part number suffix.
Typical Operating Circuit
PART
2.5V OUTPUT 1.5V
Selector Guide
OUTPUT VOLTAGE Fixed Fixed Fixed Fixed
MAX1725EUK-T MAX1726EUK18-T MAX1726EUK25-T MAX1726EUK33-T MAX1726EUK50-T
MAX1726
SHDN
Configuration appears data sheet.
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 Low-Dropout Linear Regulators MAX1725/MAX1726
ABSOLUTE MAXIMUM RATINGS
.-14V +14V SHDN .-0.3V (VIN 0.3V) (-0.3V 0.3V when OUT, (MAX1725 only) .-0.3V when >5.7V; -0.3V (VIN 0.3V) when 5.7V; -0.3V +0.3V when Continuous Current.200mA Short Circuit.Indefinite Continuous Power Dissipation +70°C) 5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .571mW .+140°C/W Junction Temperature .+150°C Operating Temperature Range .-40°C +85°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.
(Circuit Figure VOUT SHDN IOUT 1mA, -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note PARAMETER Input Voltage Range (Note Supply Current Shutdown Supply Current Voltage Range Voltage (Note Voltage Accuracy (Note Line Regulation Load Regulation Maximum Current (Note Dropout Voltage (Note Foldback Current Limit SHDN Input Threshold SHDN Input Bias Current Input Bias Current (MAX1725 only) Reverse Leakage Current Thermal Shutdown Threshold Thermal Shutdown Hysteresis VLNR VLDR IOUT SHDN SYMBOL IIN(SHDN) VOUT SHDN 12V, VOUT MAX1725 only MAX1725 +25°C +85°C -40°C +85°C 2.5V (VOUT 0.5V) IOUT 20mA, (VOUT (VOUT IOUT 20mA VOUT 2.5V, IOUT 10mA VOUT 2.5V, applicable VOUT 1.9V 12V, VOUT 2.5V SHDN 1.25V -12V, SHDN Temperature rising +25°C +85°C +25°C +85°C 0.01 -1.5 0.01 0.015 1.245 0.15 %/mA CONDITIONS UNITS
ELECTRICAL CHARACTERISTICS
12V, Ultra-Low Low-Dropout Linear Regulators
ELECTRICAL CHARACTERISTICS (continued)
PARAMETER Line-Transient Overshoot/Undershoot Load-Transient Overshoot/Undershoot Noise Note Note Note Note SYMBOL
MAX1725/MAX1726
(Circuit Figure VOUT SHDN IOUT 1mA, -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note CONDITIONS ±0.25V, IOUT from 10mA, 10Hz 100kHz UNITS µVRMS
Limits 100% production tested +25°C. temperature limits guaranteed design. Guaranteed line-regulation testing. accuracy from nominal voltage. MAX1725 tested VOUT 1.5V, 2.5V, When VOUT falls below value VOUT
Typical Operating Characteristics
(VOUT +3.3V, IOUT 1mA, +25°C, unless otherwise noted.)
SUPPLY CURRENT INPUT VOLTAGE
MAX1725/26 toc01
SUPPLY CURRENT LOAD CURRENT
MAX1725/26 toc02
SUPPLY CURRENT TEMPERATURE
MAX1725/26 toc03
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
INPUT VOLTAGE
LOAD CURRENT (mA)
TEMPERATURE (°C)
OUTPUT VOLTAGE INPUT VOLTAGE
NOMINAL OUTPUT 3.3V OUTPUT VOLTAGE (%DEVIATION) -0.2 -0.4 -0.6 -0.8 -1.0 ILOAD 20mA -1.2 -1.4 INPUT VOLTAGE ILOAD
MAX1725/26 toc04
OUTPUT VOLTAGE LOAD CURRENT
MAX1725/26 toc05
NORMALIZED OUTPUT VOLTAGE TEMPERATURE
NORMALIZED OUTPUT VOLTAGE
MAX1725/26 toc06
OUTPUT VOLTAGE DEVIATION) -0.2 -0.4 -0.6 -0.8 NOMINAL OUTPUT 3.3V 4.5V
0.30 0.20 0.10 IOUT -0.10 -0.20 -0.30
LOAD CURRENT (mA)
TEMPERATURE (°C)
12V, Ultra-Low Low-Dropout Linear Regulators MAX1725/MAX1726
Typical Operating Characteristics (continued)
(VOUT +3.3V, IOUT 1mA, +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO FREQUENCY
MAX1725/26 toc07 MAX1725/26 toc08
DROPOUT VOLTAGE LOAD CURRENT
DROPOUT VOLTAGE (mV) LOAD CURRENT (mA) -40°C 0.01 +85°C PSRR (dB)
LINE-TRANSIENT RESPONSE
COUT IOUT
MAX1725/26 toc09
VOUT 3.3V 3.3k COUT
+25°C
200mV/div
VOUT 20mV/div
FREQUENCY (kHz)
100µs/div
LOAD TRANSIENT
MAX1725/26 toc10
TURN-ON/TURN-OFF RESPONSE
COUT IOUT VSHDN 2V/div
MAX1725/26 toc11
COUT IOUT 20mA 1V/div
VOUT 100mV/div
VOUT 1V/div
400µs/div
Description
NAME MAX1725 MAX1726 SHDN Supply Voltage Input Ground Voltage Output Feedback Voltage Input Ground Active-Low Shutdown Input FUNCTION
Detailed Description
MAX1725/MAX1726 low-dropout, low-quiescentcurrent linear regulators designed primarily batterypowered applications (Figure MAX1725 provides adjustable output voltage from 1.5V using external resistor-divider. MAX1726 supplies preset output voltages 1.8V, 2.5V, 3.3V, These devices consist +1.245V error amplifier, MOSFET driver, P-channel pass transistor (Figure
12V, Ultra-Low Low-Dropout Linear Regulators
error amplifier compares 1.245V selected feedback voltage amplifies difference. feedback voltage lower than 1.245V, pass-transistor gate pulled lower, allowing more current pass, thus increasing output voltage. feedback voltage higher than 1.245V, pass-transistor gate driven higher, allowing less current pass output. output voltage back through either internal resistor voltage-divider connected (MAX1726) external resistor network connected (MAX1725). Additional features include output current limiter, reverse-battery protection, thermal sensor, shutdown logic.
MAX1725/MAX1726
Internal P-Channel Pass Transistor
MAX1725/MAX1726 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. MAX1725/MAX1726 suffer from these problems, consume only quiescent current throughout their load range (see Typical Operating Characteristics). enter shutdown, drive SHDN below 0.5V. When MAX1725/MAX1726 shut down, output pass transistor shuts off, output falls ground,
INPUT 2.5V
OUTPUT 1.5V COUT
MAX1725
SHDN
1.2M
Shutdown
Figure Typical Application Circuit
MAX1725 MAX1726
BIAS CIRCUITRY THERMAL SHUTDOWN 1.245V (MAX1726 ONLY)
SHDN
(MAX1725 ONLY)
Figure Functional Diagram
12V, Ultra-Low Low-Dropout Linear Regulators MAX1725/MAX1726
supply current drops from 0.7µA. Connect SHDN normal operation. reverse-battery protection needed, drive SHDN through 100k resistor. MAX1725 features adjustable output voltage from 1.5V using external resistors connected voltage-divider (Figure MAX1725 optimized operation with 1.2M. output voltage following equation: VOUT where typically 1.245V. simplify resistor selection: Choose 1.2M best accuracy.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation MAX1725/MAX1726. When junction temperature exceeds +150°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 devices event fault conditions. continuous operation, exceed absolute maximum junction temperature rating +150°C.
Foldback Current Limiting
MAX1725/MAX1726 also include foldback current limiter. When output shorted ground, output PMOS drive limited that output current does exceed 40mA (typ). output shorted ground indefinitely without damaging part.
Power-Supply Rejection Operation from Sources Other than Batteries
MAX1725/MAX1726 designed deliver dropout voltages quiescent currents batterypowered systems. Power-supply rejection 60dB frequencies rolls above 100Hz. high frequencies, output capacitor major contributor rejection power-supply noise (see Power-Supply Rejection Ratio Frequency graph 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 (see Supply Load Transient Response graph Typical Operating Characteristics).
Reverse-Battery Protection
MAX1725/MAX1726 have unique protection scheme that limits reverse supply current less than 10µA when forced below ground. circuitry monitors polarity input, disconnecting internal circuitry parasitic diodes when battery reversed. This feature prevents device, battery, load from overheating electrical stress. reverse-battery protection, drive SHDN through 100k resistor.
Applications Information
Capacitor Selection Regulator Stability
general purposes, capacitor MAX1725/MAX1726 input output. Larger input capacitor values lower provide better supplynoise rejection transient response. higher-value input capacitor (10µF) necessary large, fast transients anticipated device located several inches from power source. stable operation over full temperature range, minimum output. TRANSISTOR COUNT:
Chip Information
Output Voltage Selection
fixed 1.8V, 2.5V, 3.3V, output voltages, MAX1726.
12V, Ultra-Low Low-Dropout Linear Regulators MAX1725/MAX1726
Configuration
VIEW
SHDN
MAX1725 MAX1726
(GND)
SOT23-5
MAX1726 ONLY.
Package Information
SOT5L.EPS
12V, Ultra-Low Low-Dropout Linear Regulators MAX1725/MAX1726
NOTES
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 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

12V, Ultra-Low Low-Dropout Linear Regulators MAX1725/MAX1726 ultr

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