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.
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