DESCRIPTION
The LTC®3404 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 10μA and drops to < 1μA in shutdown. The 2.65V to 6V input voltage range makes the LTC3404 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.

FEATURES
■ High Efficiency: Up to 95%
■ Very Low Quiescent Current: Only 10μA
   During Operation
■ 600mA Output Current at VIN = 3.3V
■ 2.65V to 6V Input Voltage Range
■ 1.4MHz Constant Frequency Operation
■ No Schottky Diode Required
■ Low Dropout Operation: 100% Duty Cycle
■ Synchronizable from 1MHz to 1.7MHz
■ Selectable Burst Mode® Operation or
   Pulse Skipping Mode
■ 0.8V Reference Allows Low Output Voltages
■ Shutdown Mode Draws < 1μA Supply Current
■ ±2% Output Voltage Accuracy
■ Current Mode Control for Excellent Line and
   Load Transient Response
■ Overcurrent and Overtemperature Protected
■ Available in 8-Lead MSOP Package

APPLICATIONS
■ Cellular Telephones
■ Wireless and DSL Modems
■ Personal Information Appliances
■ Portable Instruments
■ Distributed Power Systems
■ Battery-Powered Equipment