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