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.