DESCRIPTION
The LTC®3406-1.2 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation with only 20µA drops <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406-1.2 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications.

FEATURES
■ High Efficiency: Up to 90%
■ Very Low Quiescent Current: Only 20µA
■ 600mA Output Current at VIN = 3V
■ 2.5V to 5.5V Input Voltage Range
■ 1.5MHz Constant Frequency Operation
■ No Schottky Diode Required
■ Shutdown Mode Draws < 1µA Supply Current
■ Current Mode Operation for Excellent Line and
   Load Transient Response
■ Overtemperature Protected
■ Low Profile (1mm) ThinSOTTM Package

APPLICATIONS
■ Cellular Telephones
■ Personal Information Appliances
■ Wireless and DSL Modems
■ Digital Still Cameras
■ MP3 Players
■ Portable Instruments