General Description
The AAT3215 MicroPower™ low dropout (LDO) linear regulator is ideally suited for portable applications where low noise, extended battery life, and small size are critical. The AAT3215 has been specifically designed for very low output noise performance, fast transient response, and high power supply rejection ratio (PSRR), making it ideal for powering sensitive RF circuits.
Other features include low quiescent current, typically 95µA, and low dropout voltage which is typically 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. A reference bypass pin has been provided to improve PSRR performance and output noise by connecting an external capacitor from the AAT3215s reference output to ground.

FEATUREs
• Low Dropout: 140mV at 150mA
• Guaranteed 150mA Output
• High Accuracy ±1.5%
• 95µA Quiescent Current
• High Power Supply Ripple Rejection
   — 70dB at 1kHz
   — 50dB at 10kHz
• Very Low Self Noise: 45µVrms
• Fast Line and Load Transient Response
• 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
• Ten Factory-Programmed Output Voltages
• SOT23 5-Pin or SC70JW 8-Pin Package

APPLICATIONs
• Bluetooth™ Headsets
• Cellular Phones
• Digital Cameras
• Notebook Computers
• Personal Portable Electronics
• Portable Communication Devices