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General Description

The MCP1623/24 is a compact, high-efficiency, fixed-frequency, synchronous step-up DC-DC converter. It provides an easy-to-use power supply solution for PIC? microcontroller applications powered by either single-cell, two-cell, or three-cell alkaline, NiCd, NiMH, and single-cell Li-Ion or Li-Polymer batteries.

Features

? Up to 96% Typical Efficiency

? 425 mA Typical Peak Input Current Limit:

- IOUT > 50 mA @ 1.2V VIN, 3.3V VOUT

- IOUT > 175 mA @ 2.4V VIN, 3.3V VOUT

- IOUT > 175 mA @ 3.3V VIN, 5.0V VOUT

? Low Start-Up Voltage: 0.65V, 3.3V VOUT @ 1 mA (typical)

? 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 (MCP1624)

? PWM-Only Operation (MCP1623)

? 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

? True Load Disconnect

? Shutdown Current (All States): <1 μA

? Low Noise, Anti-Ringing Control

? Overtemperature Protection

? Available Packages:

- 6-Lead SOT-23

- 8-Lead 2 x 3 DFN

Applications

? One, Two and Three-Cell Alkaline and NiMH/NiCd Low-Power PIC? Microcontroller Applications