General Description The MCP1640/B/C/D is a compact, high-efficiency, fixed frequency, synchronous step-up DC-DC converter. It provides an easy-to-use power supply solution for applications powered by either one-cell, two-cell, or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries. Features • Up to 96% Typical Efficiency • 800 mA Typical Peak Input Current Limit: - IOUT > 100 mA @ 1.2V VIN, 3.3V VOUT - IOUT > 350 mA @ 2.4V VIN, 3.3V VOUT - IOUT > 350 mA @ 3.3V VIN, 5.0V VOUT • Low Start-up Voltage: 0.65V, typical 3.3V VOUT @ 1 mA • Low Operating Input Voltage: 0.35V, typical 3.3VOUT @ 1 mA • Adjustable Output Voltage Range: 2.0V to 5.5V • Maximum Input Voltage ≤ VOUT < 5.5V • Automatic PFM/PWM Operation (MCP1640/C): - PFM Operation Disabled (MCP1640B/D) - PWM Operation: 500 kHz • Low Device Quiescent Current: 19 µA, typical PFM Mode • Internal Synchronous Rectifier • Internal Compensation • Inrush Current Limiting and Internal Soft-Start • Selectable, Logic Controlled, Shutdown States: - True Load Disconnect Option (MCP1640/B) - Input to Output Bypass Option (MCP1640C/D) • Shutdown Current (All States): < 1 µA • Low Noise, Anti-Ringing Control • Overtemperature Protection • Available Packages: - SOT23-6 - 2x3 8-Lead DFN Applications • One, Two and Three Cell Alkaline and NiMH/NiCd Portable Products • Single Cell Li-Ion to 5V Converters • Li Coin Cell Powered Devices • Personal Medical Products • Wireless Sensors • Handheld Instruments • GPS Receivers • Bluetooth Headsets • +3.3V to +5.0V Distributed Power Supply
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