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.

FEATURES

• Wide 4.5V to 16V Input Voltage Range

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

• Output Adjustable Down to 0.81V

• 0.3Ω 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

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