ACT4455

ACT4455 Rev 2, 21-Nov-12 36V/5A Step Down DC/DC Converter FEATURES 7.5V to 36V Input Voltage 40V Input Voltage Surge Up to 5A Output Current Up to 12V Output Voltage Dual Outputs with Independent Over Current Protection 7.5% Accurate Over Current Protection (OCP) Integrated 45mΩ High Side Power FET 90% Efficiency at Heavy Load Internal 3ms Soft Startup Low Standby Input Current Sleeping Mode at OCP, OTP and SCP Zero Input and Output Currents at Over Current and Short Circuit Protection Auto Recovery into Full Load after Faults Output Cord Voltage Drop Compensation Stable with Low ESR Ceramic Output Capacitors Internal Cycle-by-Cycle Current Control Programmable Over Current Setting SOP-8EP Package APPLICATIONS Automotive Industry Dual-Output Car Charger LCD-TV GENERAL DESCRIPTION ACT4455 is a wide input voltage step-down DC/DC converter with high-side MOSFET integrated. It provides up to 5A continuous output current at 200kHz switching frequency. The converter can be configured as single output or dual outputs with independent over current protection. The converter achieves high efficiency and excellent load and line regulation. The converter enters into hiccup and sleeping mode and the converter power consumption is nearly zero when output is overloaded or shorted to ground. Other protection features includes cycle-by-cycle current limit, under voltage protection and thermal shutdown. The device is available in SOP8-EP package. ...