Preliminary
Information
3215.2002.03.0.91 1
General Description
The AAT3215 MicroPower™ Low Dropout Linear
Regulator is ideally suited for portable applications
where low noise, extended battery life and small
size are critical. The AAT3215 has been specifi-
cally designed for very low output noise perform-
ance, fast transient response and high power sup-
ply rejection ratio (PSRR), making it ideal for pow-
ering sensitive RF circuits.
Other features include low quiescent current, typi-
cally 95µA, and low dropout voltage which is typi-
cally less than 140mV at full output current. The
device is output short circuit protected and has a
thermal shutdown circuit for additional protection
under extreme conditions.
The AAT3215 also features a low-power shutdown
mode for extended battery life. Areference bypass
pin has been provided to improve PSRR perform-
ance and output noise, by connecting an external
capacitor from the AAT3215's reference output to
ground.
The AAT3215 is available in a space saving 5-pin
SOT-23 or 8-pin SC70-JW package in 8 factory
programmed voltages of 2.5V, 2.7V, 2.8V, 2.85V,
2.9V, 3.0V, 3.3V, or 3.5V.
Features
• Low Dropout - 140mV at 150mA
• Guaranteed 150mAOutput
• High accuracy ±1.5%
• 95µAQuiescent Current
• High Power Supply Ripple Rejection
• 70 dB at 1kHz
• 50 dB at 10kHz
• Very low self noise 45µVrms/rtHz
• Fast line and load transient response
• Short circuit protection
• Over-Temperature protection
• Uses Low ESRceramic capacitors
• Noise reduction bypass capacitor
• Shutdown mode for longer battery life
• Low temperature coefficient
• 8 Factory programmed output voltages
• SOT-23 5-pin or SC70-JW 8-pin package
Applications
• Cellular Phones
• Notebook Computers
• Portable Communication Devices
• Personal Portable Electronics
• Digital Cameras
AAT3215
150mACMOS High Performance LDO
Typical Application
AAT3215
EN
IN
OUT
BYP
GND
ON/OFF
1µF 10nF
2.2µF
V
IN
GND GND
VOUT
PowerLinear
™