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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: 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