Description
The MCP1612 is a 1A, 1.4 MHz, fully-integrated, current mode-controlled, synchronous buck regulator. The MCP1612 is packaged in the 8-pin MSOP and space-saving, 3x3 DFN packages. The DFN package also provides a lower thermal resistance package option for high-power, high ambient temperature applications. With an input operating range from 2.7V to 5.5V, the MCP1612 is ideal for applications that are powered by one single-cell Li-Ion, 2- to 3-cell NiMH, NiCd or alkaline sources.

Features
• Fixed Switching Frequency: 1.4 MHz
• Input Operating Voltage Range: 2.7V to 5.5V
• Integrated Buck and Synchronous Switches
• Adjustable-Output Voltage Range: 0.8V to 5.0V
• 100% Duty Cycle Capable for Low Input Voltage
• Continuous Output Current Capability: 1A
• Shutdown Control with IQ < 0.01 µA (Typ.)
• Integrated Soft-Start Feature
• Integrated Undervoltage Lockout (UVLO) Protection
• Integrated Overtemperature Protection
• Fast Dynamic Response to Line and Load Steps
• Small, 8-Pin DFN and MSOP Packages
• Operating Temperature Range: -40°C to +85°C

Applications
• Network Interface Cards
• Portable Computers
• Set-Top Boxes
• DSL Modems and Routers
• USB-Powered Devices
• GBIC Modules
• High-Speed Data System Bus Termination
• Medical Instruments
• Cellular/GSM/PHS Phones
• +5V or +3.3V Distributed Voltages