SL3053B 6.0V 3A 1.2MHz Synchronous Step-Down Regulator

General Description 

The SL3053B is a high-efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version. Supply current with no load is 40uA and drops to <1uA in shutdown The 2 5V to 6 0V input voltage range makes theSL3053B ideally suited for single Li-Ion battery powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM/PFM mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 1.2MHz, allowing the use of small surface mount inductors and capacitors. Low output voltages are easily supported with the 0.6V feedback reference voltage. 

The SL3053B is of fered i n a low profile ( 1mm) 5-pin, thin SOT packa ge, and is available in a n adjustable version. 

Features 

•   High Efficiency: Up to 96%   

•   2.5V to 6.0V Input Voltage Range   

•   Over temperature Protected 

•   Low Quiescent Current: 40µA   

•   Inrush Current Limit and Soft Start   

•   1.2MHz Constant Frequency Operation            

•   Short Circuit Protection  

•   Up to 3.0A Current Output

•   No Schottky Diode Required 

•   Low Dropout Operation:100% Duty Cycle 

•   PFM Mode for High Efficiency in Light Load      

•   SOT23-5/6 package 

Applications 

•   Cellular and Smart Phones                       

•   Portable Instruments  

•   Wireless and DSL Modems   

•   PDAs  

•   Digital Still and Video Cameras   

•   PC Cards 

Typical Application Circuit