GENERAL DESCRIPTION

The ACT6390/ACT6391 are high-performance, fixed-frequency, current-mode PWM step-up DC/DC converters that incorporate internal power MOSFETs. The ACT6390 includes an integrated 0.2Ω power MOSFET that supports peak currents of up to 1.7A, while the ACT6391’s integrated 0.15Ω power MOSFET supports currents of up to 2.5A.

FEATURES

• Greater than 90 Efficiency

• Adjustable Output Voltage Up to 12V

• Internal 14V Power MOSFET

• Two Peak Current Options:

    − ACT6390: 1.7A, 0.2Ω

    − ACT6391: 2.5A, 0.15Ω

• Selectable 700kHz/1.3MHz Frequency

• Integrated Over-Voltage Protection (OVP)

• Programmable Soft-Start Function

• Thermal Shutdown

• Cycle-by-Cycle Over-Current Protection

• Small MSOP-8 Package

APPLICATIONS

• TFT LCD Monitors

• Battery-Powered Equipment

• Set-Top Boxes

• DSL and Cable Modems and Routers