GENERAL DESCRIPTION

The ACT4082A is a current-mode step-down DC/DC converter that supplies up to 1.2A into 5V from a 12V input. 1.4MHz switching frequency allows the use of tiny external components, and internal loop compensation provides simple, stable power supplies with a minimum of external components. Optimized for use with ceramic input and output capacitors, the ACT4082A provides a very compact 1.2A power supply for space constrained mobile and consumer applications.

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FEATURES

? Wide 4.5V to 16V Input Voltage Range

? 1.2A Output Current (12VIN to 5VOUT)

? Output Adjustable Down to 0.81V

? 0.3? Internal Power MOSFET

? Up to 92 Efficiency

? Stable with Low ESR Ceramic Output Capacitors

? Fixed 1.4MHz Operating Frequency

? Internal Soft-Start Function

? Over Current Protection with Hiccup-Mode

? Thermal Shutdown

? Available in a SOT23-6 Package

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APPLICATIONS

? TFT LCD Monitors

? Portable DVDs, Headphones, MP3 Players, etc.

? Car-Powered or Battery-Powered Equipment

? Set-Top Boxes

? Telecom Power Supplies

? DSL and Cable Modems and Routers

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