DESCRIPTION
The LTC®3406A is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 20μA, dropping to ≤1μA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406A ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery runtime portable systems. Automatic Burst Mode operation increases efficiency at light loads, further extending battery runtime.

FEATURES
■ High Effi ciency: Up to 96%
■ Very Low Quiescent Current: Only 20µA
■ Low Output Ripple Voltage During Burst Mode®
   Operation
■ 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
■ ±2% 0.6V Reference
■ Shutdown Mode Draw ≤1µA Supply Current
■ Internal Soft-Start Limits Inrush Current
■ Current Mode Operation for Excellent Line and
   Load Transient Response
■ Overtemperature Protected
■ Low Profi le (1mm) ThinSOTTM Package

APPLICATIONS
■ Cellular Telephones
■ Wireless and DSL Modems
■ Digital Still Cameras
■ Media Players
■ Portable Instruments
■ Point of Load Regulation