MAX1725

Features:

2µA Supply Current
Reverse-Battery Protection
+2.5V to +12V Input Voltage Range
Fixed 1.8V, 2.5V, 3.3V, and 5V Output Voltages(MAX1726)
Adjustable 1.5V to 5V Output Voltages (MAX1725)
20mA Guaranteed Output Current
1.5% Output Voltage Accuracy
Small 1µF Output Capacitor
Short-Circuit Protection
Thermal Protection
Tiny 5-Pin SOT23 Package

Application

Smoke Detectors
Remote Transmitters
Smart Battery Packs
Industrial Control Systems
Microcontroller Power
Real-Time Clock Backup Power
PDAs and Handy-Terminals
Battery-Powered Alarms


Pinout




Specifications

IN to GND...........................................................................-14V to +14V
SHDN to GND.......-0.3V to (V_IN + 0.3V)(-0.3V to + 0.3V when V_IN < 0V)
OUT, FB (MAX1725 only) to GND................................-0.3V to +6V when  
                                          V_IN >5.7V; -0.3V to (V_IN + 0.3V) when 0V <
                                          V_IN < 5.7V; -0.3V to +0.3V when V_IN < 0V
OUT Continuous Current.............................................................200mA
OUT Short Circuit.....................................................................Indefinite
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) ...................571mW
JA ......................................................................................+140°C/W
Junction Temperature...............................................................+150°C
Operating Temperature Range ..................................-40°C to +85°C
Storage Temperature Range ...................................-65°C to +150°C
Lead Temperature (soldering, 10s) .........................................+300°C


Description

The MAX1725/MAX1726 are ultra-low supply current, low-dropout linear regulators intended for low-power applications that demand the longest possible battery life. Unlike inferior PNP-based designs, the MAX1725/ MAX1726s' PMOS pass elements maintain an ultra-low 2µA supply current throughout their entire operating range and in dropout. Despite their ultra-low power consumption, the MAX1725/MAX1726 have tight output accuracy (1.5%) and require just 1µF output capacitance to achieve good load-transient response.

These regulators have a wide input voltage range (+2.5V to +12V), making them excellent choices for systems powered from two lithium-ion (Li+) cells and 9V batteries. Other features include reverse-battery protection, short-circuit protection, and thermal protection.

The MAX1725 provides an adjustable 1.5V to 5V output using an external resistor-divider. The MAX1726 provides factory preset 1.8V, 2.5V, 3.3V, or 5V output voltages (see the Ordering Information). Both devices are available in a tiny 5-pin SOT23 package.