MCP1612 Single 1A, 1.4 MHz Synchronous Buck Regulator Features Description Fixed Switching Frequency: 1.4 MHz The MCP1612 is a 1A, 1.4MHz, fully-integrated, current mode-controlled, synchronous buck regulator. Input Operating Voltage Range: 2.7V to 5.5V The MCP1612 is packaged in the 8-pin MSOP and Integrated Buck and Synchronous Switches space-saving, 3x3 DFN packages. The DFN package Adjustable-Output Voltage Range: 0.8V to 5.0V also provides a lower thermal resistance package 100% Duty Cycle Capable for Low Input Voltage option for high-power, high ambient temperature Continuous Output Current Capability: 1A applications. With an input operating range from 2.7V Shutdown Control with I < 0.01 A (Typ.) to 5.5V, the MCP1612 is ideal for applications that are Q powered by one single-cell Li-Ion, 2- to 3-cell NiMH, Integrated Soft-Start Feature NiCd or alkaline sources. Integrated Undervoltage Lockout (UVLO) The output voltage of the MCP1612 is easily set over Protection the range of 0.8V to 5.0V by using an external resistor Integrated Overtemperature Protection divider. The external inductor and output capacitor size Fast Dynamic Response to Line and Load Steps are minimized due to an internally-fixed, 1.4 MHz clock Small, 8-Pin DFN and MSOP Packages being used to set the switching frequency. The fixed Operating Temperature Range: -40C to +85C clock allows for continuous, fixed-frequency PWM operation over the full load range. Applications The MCP1612 is designed to provide fast dynamic Network Interface Cards response to sudden changes in input voltage and load Portable Computers current to minimize the necessary amount of external Set-Top Boxes output capacitance. DSL Modems and Routers The MCP1612 can be used with ceramic, tantalum or USB-Powered Devices aluminum electrolytic output capacitors. Ceramic capacitors with values as low as 4.7 F can be used to GBIC Modules keep the output ripple voltage low. For applications that High-Speed Data System Bus Termination require better load step performance, the value of the Medical Instruments output capacitor can be increased to 47 F. Cellular/GSM/PHS Phones Additional features integrated into the MCP1612 +5V or +3.3V Distributed Voltages include shutdown capability, soft-start, UVLO, overcurrent and overtemperature protection. Package Types 8-Lead DFN 8-Lead MSOP V V L L 1 8 IN 1 8 IN X X V V 2 7 P 2 7 P CC GND CC GND SHDN SHDN 3 6 3 6 A A GND GND COMP 4 5 4 5 COMP FB FB 2004-2013 Microchip Technology Inc. DS21921C-page 1MCP1612 Functional Block Diagram Undervoltage V UVLO V CC IN Lockout (UVLO) I P-Channel Slope Comp. SENSE + + Peak Current Limit PDRV Comp Disable L V INSET X REF Circuit NDRV FB IN gm + Soft- Start Disable Disable V REF Peak Current 1.4 MHz Clock Limit P Leading- GND Edge Blank P GND V CC V CC UVLO 1.2V Disable SHDN V BG A A GND Thermal Shutdown 0.8V A GND A GND DS21921C-page 2 2004-2013 Microchip Technology Inc.