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