DESCRIPTION
The LTC®1878 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 LTC1878 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
■ 550kHz Constant Frequency Operation
■ Synchronizable from 400kHz to 700kHz
■ Selectable Burst ModeTM Operation or Pulse Skipping Mode
■ No Schottky Diode Required
■ Low Dropout Operation: 100% Duty Cycle
■ 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 Modems
■ Personal Information Appliances
■ Portable Instruments
■ Distributed Power Systems
■ Battery-Powered Equipment