PRODUCT DATASHEET
AAT3238
PowerLinear
TM
300mA MicroPower
TM
High Performance LDO Linear Regulator
Features
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Low Dropout: 400mV at 300mA
Guaranteed 300mA Output
High Accuracy: ±1.5%
70µA Quiescent Current
Fast Line and Load Transient Response
High-Speed Device Turn-On and Shutdown
High Power Supply Ripple Rejection
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
Factory-Programmed Output Voltages
SOT23 6-Pin or SC70JW 8-Pin Package
General Description
The AAT3238 MicroPower low dropout (LDO) linear regu-
lator is ideally suited for portable applications where
very fast transient response, extended battery life, and
small size are critical. The AAT3238 has been specifically
designed for high-speed turn-on and turn-off perfor-
mance, fast transient response, good power supply rip-
ple rejection (PSRR), and is reasonably low noise, mak-
ing it ideal for powering sensitive circuits with fast
switching requirements.
Other features include low quiescent current, typically
70µA, and low dropout voltage, typically less than
400mV at the maximum output current level of 300mA.
The device is output short-circuit protected and has a
thermal shutdown circuit for additional protection under
extreme operating conditions.
The AAT3238 also features a low-power shutdown mode
for extended battery life. A reference bypass pin has
been provided to improve PSRR performance and output
noise by connecting a small external capacitor from the
AAT3238’s reference output to ground.
The AAT3238 is available in a Pb-free, space-saving
6-pin SOT23 or 8-pin SC70JW package in factory-pro-
grammed voltages.
Applications
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Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
V
IN
IN
OUT
V
OUT
AAT3238
ON/OFF
EN
GND
1µF
10nF
2.2µF
BYP
GND
GND
3238.2008.05.1.7
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