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.

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