0.65V Start-up Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option

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