General Description
The LP3983 is designed for portable RF and wireless applications with demanding performance and space requirements. The LP3983 performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. A noise bypass pin is available for further reduction of output noise. Regulator ground current increases only slightly in dropout, further prolonging the battery life.

Features
‹ Ultra-Low-Noise for RF Application
‹ 2.5V- 6V Input Voltage Range
‹ Low Dropout : 200mV @ 300mA
‹ High PSSR:-70dB at 1KHz
‹ < 0.01uA Standby Current When Shutdown
‹ TTL-Logic-Controlled Shutdown Input
‹ Custom Voltage Available
‹ Ultra-Fast Response in Line/Load Transient
‹ Quick Start-Up (Typically 50us)
‹ Current Limiting and Thermal Shutdown Protection

Applications
— PMP/PDA/MP3 players
— Cellular and Mobile phone
— RF Module
— Sensor Module