MCP1601

MCP1601 500 mA Synchronous BUCK Regulator Features Input Range of 2.7V to 5.5V 3 Operating Modes: PWM, PFM and LDO Integrated BUCK and Synchronous Switches Ceramic or Electrolytic Input/Output Filtering Capacitors 750 kHz Fixed Switching Frequency Oscillator Synchronization to 1 MHz PWM Mode Auto-Switching from PWM/PFM Operation 100% Duty Cycle Capable for Low Input Voltage 500 mA Continuous Output Current Capability Integrated Under-Voltage Lock-Out Protection Integrated Over-Temperature Protection Integrated Soft Start Circuitry Low Output Voltage Capability to 0.9V Temperature Range: -40°C to +85ºC Small 8-Pin MSOP Package Applications Low Power Handheld CPUs and DSPs Cellular Phones Organizers and PDAs Digital Cameras +5V or +3.3V Distributed Voltages USB Powered Devices Package Type 8-Pin MSOP VIN SHDN FB AGND 1 8 2 7 MCP1601 3 6 4 5 LX PGND VOUT SYNC/PWM Description The MCP1601 is a fully integrated synchronous BUCK (step down) DC/DC converter for battery powered systems. With an input operating range of 2.7V to 5.5V, the MCP1601 is ideal for applications being powered by one single cell Li-Ion, 2 to 3 cell NiMH, NiCd or alkaline sources. Output voltages can range from 0.9V to VIN to accommodate a wide range of applications. Efficiency can exceed 92% while operating at 750 kHz with load current capability up to 500 mA. The MCP1601 is used to minimize space, cost and wasted energy. The PWM mode switching frequency i...