LP3984 General Description  
The LP3984 is designed for portable RF and wireless applications with demanding performance and space requirements. The LP3984 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. The LP3984 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. The LP3984 consumes less than 0.01µA in shutdown mode and has fast turn-on time less than 50µs. The other features
include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the 5-lead of SOT23-5 packages.

LP3984 Features  
 ·  Ultra-Low-Noise for RF Application 　
 ·  2V- 6.5V Input Voltage Range
 ·  Low Dropout : 220mV @ 300mA 　
 ·  1.2V, 1.5V, 1.8V, 2.5V, 2.8V 3.0V and 3.3V Fixed
 ·  300mA Output Current, 550mA Peak Current  
 ·  High PSSR:-73dB at 1KHz  
 ·  < 0.01uA Standby Current When Shutdown
 ·  Available in SOT23-5 Package 　
 ·  TTL-Logic-Controlled Shutdown Input 　
 ·  Ultra-Fast Response in Line/Load transient 　
 ·  Current Limiting and Thermal Shutdown Protection
 ·  Quick start-up (typically 50uS)

LP3984 Applications 
 · Portable Media Players/MP3 players  
 · Cellular and Smart mobile phone  
 · LCD
 · DSC Sensor
 · Wireless Card