LTC1707

U U FEATURES s 600mA Output Current (VIN ≥ 4V) s High Efficiency: Up to 96% s Constant Frequency: 350kHz Synchronizable to 550kHz s 2.85V to 8.5V VIN Range s 0.8V Feedback Reference Allows Low Voltage Outputs: 0.8V ≤ VOUT ≤ VIN s No Schottky Diode Required s 1.19V ±1% Reference Output Pin s Selectable Burst ModeTM Operation/Pulse Skipping Mode s Low Dropout Operation: 100% Duty Cycle s Precision 2.7V Undervoltage Lockout s Current Mode Control for Excellent Line and Load Transient Response s Low Quiescent Current: 200µA s Shutdown Mode Draws Only 11µA Supply Current s Available in 8-Lead SO Package U APPLICATIO S s Cellular Telephones s Portable Instruments s Wireless Modems s RF Communications s Distributed Power Systems s Single and Dual Cell Lithium LTC1707 High Efficiency Monolithic Synchronous Step-Down Switching Regulator DESCRIPTIO 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. The switching frequency is internally set at 350kHz, allowing the use of small surface mount inductors. For noise sensitive applications it can be externally synchronized up to 550kHz. Burst Mode operation is inhib...