上海XR3406（DC/DC降压IC）

FEATURES

? High Efficiency: Up to 96%

? 1.5MHz Constant Frequency Operation

? 800mA Output Current

? No Schottky Diode Required

? 2V to 6V Input Voltage Range

? Output Voltage as Low as 0.6V

? PFM Mode for High Efficiency in Light Load

? 100% Duty Cycle in Dropout Operation

? Low Quiescent Current: 20μA

? Slope Compensated Current Mode Control forExcellent Line and Load Transient Response

? Short Circuit Protection

? Thermal Fault Protection

? Inrush Current Limit and Soft Start

? <1μA Shutdown Current

? SOT23-5 package

APPLICATIONS

? Cellular and Smart Phones

? Wireless and DSL Modems

? PDAs

? Portable Instruments

? Digital Still and Video Cameras

? DTV

GENERAL DESCRIPTION

  The XR3406 is a constant frequency, current modestep-down converter. The device integrates a mainswitch and a synchronous rectifier for highefficiency without an external Schottky diode. It isideal for powering portable equipment that runsfrom a single cell Lithium-Ion (Li+) battery. Theoutput voltage can be regulated as low as 0.6V.The XR3406 can also run at 100% duty cycle forlow dropout operation, extending battery life inportable system. This device offers two operationmodes, PWM control and PFM Mode switchingcontrol, which allows a high efficiency over thewider range of the load.

  The XR3406 is offered in a low profile 5-pin, SOTpackage, and is available in an adjustable version.