ACT4533B

ACT4533A/B Wide Input Sensorless CC/CV Step-Down DC/DC Converter FEATURES 40 V Input Voltage Surge 36 V Steady State Operation Up to 3.5 A output current Output Voltage up to 12 V 125 kHz Switching Frequency Eases EMI Design 91% Efficiency (VOUT = 5 [email protected] A at VIN = 12 V) 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 1.5 A to 4.0 A  Patented Cable Compensation from 0 to 0.25 Ω ±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 Device CV/CC regulation DC/DC converter 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 3.5 A output current at 125 kHz switching frequency. ActiveCC is a patented control scheme to achieve highaccuracy sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense...