MCP1612T-ADJI/MS

The MCP1612 is a 1A, 1.4 MHz, fully-integrated, current mode-controlled, synchronous buck regulator. It 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, it is ideal for applications that are powered by one single-cell Li-Ion, 2- to 3-cell NiMH, NiCd or alkaline sources. The output voltage is easily set over the range of 0.8V to 5.0V by using an external resistor divider. The external inductor and output capacitor size are minimized due to an internally-fixed, 1.4 MHz clock being used to set the switching frequency. The fixed clock allows for continuous, fixed-frequency PWM operation over the full load range. It is designed to provide fast dynamic response to sudden changes in input voltage and load current to minimize the necessary amount of external output capacitance. It can be used with ceramic, tantalum or aluminum electrolytic output capacitors. Ceramic capacitors with values as low as 4.7 μF can be used to keep the output ripple voltage low. For applications that require better load step performance, the value of the output capacitor can be increased to 47 μF. Additional features integrated into it include shutdown capability, soft-start, UVLO, overcurrent and overtemperature protection.

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

Key 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