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