DESCRIPTION
The LTC®1707 is a high efficiency monolithic current mode synchronous buck regulator using a fixed frequency architecture. The operating supply range is from 8.5V down to 2.85V, making it suitable for both single and dual lithium-ion battery-powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, extending operating time in battery-powered systems.

FEATURES
■ 600mA Output Current (VIN ≥ 4V)
■ High Efficiency: Up to 96%
■ Constant Frequency: 350kHz Synchronizable to 550kHz
■ 2.85V to 8.5V VIN Range
■ 0.8V Feedback Reference Allows Low Voltage Outputs: 0.8V ≤ VOUT ≤ VIN
■ No Schottky Diode Required
■ 1.19V ±1% Reference Output Pin
■ Selectable Burst ModeTM Operation/Pulse Skipping Mode
■ Low Dropout Operation: 100% Duty Cycle
■ Precision 2.7V Undervoltage Lockout
■ Current Mode Control for Excellent Line and Load Transient Response
■ Low Quiescent Current: 200µA
■ Shutdown Mode Draws Only 15µA Supply Current
■ Available in 8-Lead SO Package

APPLICATIONS
■ Cellular Telephones
■ Portable Instruments
■ Wireless Modems
■ RF Communications
■ Distributed Power Systems
■ Single and Dual Cell Lithium