General Description

The MCP16251/2 is a compact, high-efficiency, fixed frequency, synchronous step-up DC-DC converter. This family of devices 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

•650 mA Typical Peak Input Current Limit:

-IOUT > 100 mA @ 3.3V VOUT, 1.2V VIN

-IOUT > 250 mA @ 3.3V VOUT, 2.4V VIN

-IOUT > 225 mA @ 5.0V VOUT, 3.3V VIN

• Low Device Quiescent Current:

- Output Quiescent Current: < 4 µA typical, device is not switching (VOUT > VIN, excluding feedback divider current)

- Input Sleep Current: 1 µA

- No Load Input Current: 14 µA typical

• Shutdown Current: 0.6 µA typical

• Low Start-up Voltage: 0.82V, 1 mA load

• Low Operating Input Voltage: down to 0.35V

• Adjustable Output Voltage Range: 1.8V to 5.5V

• Maximum Input Voltage VOUT< 5.5V

• Automatic PFM/PWM Operation:

- PWM Operation: 500 kHz

- PFM Output Ripple: 150 mV typical

• Feedback voltage: 1.23V

• Internal Synchronous Rectifier

• Internal Compensation

• Inrush Current Limiting and Internal Soft Start (1.5 ms typical)

• Selectable, Logic Controlled, Shutdown States:

- True Load Disconnect Option (MCP16251)

- Input to Output Bypass Option (MCP16252)

• Anti-Ringing Control

• Overtemperature Protection

• Available Packages:

-SOT-23-6

-2 x 3 8-Lead TDFN



Applications:

• One, Two and Three Cell Alkaline and NiMH/NiCd Portable Products

• Solar Cell Applications

• Personal Care and Medical Products

• Bias for Status LEDs

• Smartphones, MP3 Players, Digital Cameras

• Remote controllers, Portable Instruments

• Wireless Sensors

• Bluetooth Headsets

• +3.3V to +5.0V Distributed Power Supply