The RICHTEK IC is high quality!  Ultra-Low-Noise for RF Application
 Ultra-Fast Response in Line/Load Transient
 Quick Start-Up (Typically 40μs)<0.1μA Standby Current When Shutdown
 Low Dropout : 240mV at 1A
 Wide Operating Voltage Ranges : 2.5V to 5.5V
 TTL-Logic-Controlled Shutdown Input
 Current Limiting Protection
 Thermal Shutdown Protection
 Only 2.2μF Output Capacitor Required for Stability
 High Power Supply Rejection Ratio
 RoHS Compliant and 100% Lead (Pb)-Free
Applications
 CDMA/GSM Cellular Handsets
 Battery-Powered Equipment
 Laptop, Palmtops, Notebook Computers
 Hand-Held Instruments
 Mini PCI & PCI-Express Cards
PCMCIA & New Cards
 Portable Information Appliances