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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 ¡Ü VOUT < 5.5V

? Automatic PFM/PWM Operation (MCP1640/C):

- PFM Operation Disabled (MCP1640B/D)

- PWM Operation: 500 kHz

? Low Device Quiescent Current: 19 ?A, 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 ?A

? 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