General Description  
The LP3980 is designed for portable RF and wireless  applications demanding performance and space  requirements. The LP3980 performance is optimized  for battery-powered systems to deliver ultra low noise  and low quiescent current. Regulator ground current  increases only slightly in dropout, further prolonging  the battery life. The LP3980 also works with low-ESR  ceramic capacitors, reducing the amount of board  space necessary for power applications, critical in  hand-held wireless devices. The LP3980 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.
Applications
? Portable Media Players/MP3 players  
? Cellular and Smart mobile phone  
? LCD ? DSC Sensor
? Wireless Card
Features
? 1.6V- 5.5V Input Voltage Range
? Low Dropout : 240mV @ 300mA,3.3V
? 300mA Output Current
? High PSRR: -76dB at 1KHz
? ＜1μA Standby Current When Shutdown
? Ultra-Fast Response in Line/Load transient
? Current Limiting
? Thermal Shutdown Protection
? Available in SOT23-5/SOT23/TDFN-4 Package