ACT4533A

ACT4533A/B Rev 0, 14-Aug-13 Wide-Input Sensorless CC/CV Step-Down DC/DC Converter FEATURES 40V Input Voltage Surge 36V Steady State Operation Up to 3.5A output current Output Voltage up to 12V 125kHz Switching Frequency Eases EMI Design 91% Efficiency ([email protected] at Vin=12V) Stable with Low-ESR Ceramic Capacitors to Allow Low-Profile Designs Integrated Over Voltage Protection Excellent EMI Performance Patented ActiveCC Sensorless Constant Current Control Improves Efficiency and Lowers Cost. Resistor Programmable − Current Limit from 1.5A to 4.0A − Patented Cable Compensation from 0 to 0.25Ω ±7.5% CC Accuracy − Compensation of Input /Output Voltage Change − Temperature Compensation − Independent of inductance and Inductor DCR 2% Feedback Voltage Accuracy Advanced Feature Set − Integrated Soft Start − Thermal Shutdown − Secondary Cycle-by-Cycle Current Limit − Protection Against Shorted ISET Pin SOP-8EP Package APPLICATIONS Car Charger/ Adaptor Rechargeable Portable Devices General-Purpose CV/CC Power Supply GENERAL DESCRIPTION ACT4533A/B is a wide input voltage, high efficiency ActiveCC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4533A/B provides up to 3.5A output current at 125kHz switching frequency. ActiveCC is a patented control scheme to achieve high-accuracy sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current s...