HM3420B

 Features  1.5MHz Constant Frequency Operation  No Schottky Diode Required  Low Dropout Operation:100% Duty Cycle  PFM Mode for High Efficiency in Light Load  Over temperature Protected  Low Quiescent Current: 40μA  Short Circuit Protection  Inrush Current Limit and Soft Start  SOT23 -5 package Applications  Cellular and Smart Phones  Wireless and DSL Modems  PDAs  Portable Instruments  Digital Still and Video Cameras  PC Cards +03420B  General Description The HM3420B 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 5.5V input voltage range makes the HM3420B 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 ...