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