AAT3239
500mA MicroPower™ LDO
™
PowerLinear
General Description
Features
The AAT3239 MicroPower low dropout (LDO) linear
regulator is ideally suited for portable applications
where very fast transient response, extended battery
life, and small size are critical. The AAT3239 has
been specifically designed for high-speed turn-on
and turn-off performance, fast transient response,
good power supply rejection ratio (PSRR), and is
reasonably low noise, making it ideal for powering
sensitive circuits with fast switching requirements.
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500mA Output Current
Low Dropout: 400mV at 300mA
High Accuracy: ±2.0%
70µA Quiescent Current
Fast Line and Load Transient Response
High-Speed Device Turn-On and Shutdown
High Power Supply Rejection Ratio
Low Self Noise
Short-Circuit Protection
Over-Temperature Protection
Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
Noise Reduction Bypass Capacitor
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
TSOPJW 8-Pin Package
Other features include low quiescent current, typical-
ly 70µA, and low dropout voltage which is typically
less than 400mV at 300mA. The device is output
short-circuit protected and has a thermal shutdown
circuit for additional protection under extreme operat-
ing conditions.
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The AAT3239 also features a low-power shutdown
mode for extended battery life. A reference bypass
pin has been provided to improve PSRR perform-
ance and output noise by connecting a small exter-
nal capacitor from the AAT3239's reference output to
ground.
Applications
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Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
The AAT3239 is available in a Pb-free, 8-pin
TSOPJW package in factory-programmed voltages.
Typical Application
VIN
VOUT
IN
OUT
AAT3239
BYP
ON/OFF
1µF
EN
GND
10nF
2.2µF
GND
GND
3239.2006.03.1.2
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