ACT4523A

ACT4523A Rev 0, 25-Jul-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 250kHz Switching Frequency 91% Efficiency (Vout = [email protected] at Vin = 12V) Patented ActiveCC Sensorless Constant Current Control − Integrated Current Control Improves Efficiency, Lowers Cost, and Reduces Component Count Resistor Programmable − Current Limit from 1.5A to 4.0A − Patented Cable Compensation from 0 to 0.25Ω ±6.5% 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 CC/CV Supply GENERAL DESCRIPTION ACT4523A 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. ACT4523A provides up to 3.5A output current at 250kHz switching frequency. Active CC is a patented control scheme to achieve highest accuracy with sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate curre...