DESCRIPTION
The LTC®3406AB is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current with no load is 200µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406AB ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery run time in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. Refer to LTC3406A for applications that require Burst Mode® operation.

FEATURES
■ High Efficiency: Up to 96%
■ 600mA Output Current
■ 2.5V to 5.5V Input Voltage Range
■ 1.5MHz Constant Frequency Operation
■ No Schottky Diode Required
■ Low Dropout Operation: 100% Duty Cycle
■ Low Quiescent Current: 200µA
■ ±2% 0.6V Reference
■ Shutdown Mode Draws <1µA Supply Current
■ Internal Soft-Start Limits Inrush Current
■ Current Mode Operation for Excellent Line and
   Load Transient Response
■ Overtemperature Protected
■ Low Profile (1mm) ThinSOTTM Package

APPLICATIONS
■ Cellular Telephones
■ Satellite and GPS Receivers
■ Wireless and DSL Modems
■ Digital Still Cameras
■ Media Players
■ Portable Instruments