AAT3218
150mA MicroPower™ High Performance LDO
™
PowerLinear
General Description
Features
The AAT3218 MicroPower low dropout linear regula-
tor is ideally suited for portable applications where
very fast transient response, extended battery life,
and small size are critical. The AAT3218 has been
specifically designed for high-speed turn-on and turn-
off performance, fast transient response, and good
power supply ripple rejection (PSRR), and is reason-
ably low noise, making it ideal for powering sensitive
circuits with fast switching requirements.
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Low Dropout: 200mV at 150mA
Guaranteed 150mA 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 and Over-Temperature
Protection
Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
Output Noise Reduction Bypass Capacitor
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
Other features include low quiescent current, typical-
ly 70µA, and low dropout voltage, typically less than
200mV at the maximum output current level of
150mA. The device is output short-circuit protected
and has a thermal shutdown circuit for additional pro-
tection under extreme operating conditions.
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16 Factory-Programmed Output Voltages
SOT23 5-Pin or SC70JW 8-Pin Package
The AAT3218 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
external capacitor from device reference output to
ground.
Applications
The AAT3218 is available in a Pb-free, space-sav-
ing 5-pin SOT23 or 8-pin SC70JW package in 16
factory-programmed voltages: 1.2V, 1.4V, 1.5V,
1.8V, 1.9V, 2.0V, 2.3V, 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 2.9V, 3.0V, 3.3V, or 3.5V.
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Bluetooth™ Headsets
Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
VIN
VOUT
IN
OUT
BYP
AAT3218
ON/OFF
EN
GND
1μF
10nF
2.2μF
GND
GND
3218.2006.04.1.8
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