ACT4513

ACT4513 Rev 7, 14-Nov-12 Wide-Input Sensorless CC/CV Step-Down DC/DC Converter FEATURES Up to 40V Input Voltage Up to 2A output current Output Voltage up to 12V Patent Pending Active CC Sensorless Constant Current Control − Integrated Current Control Improves Efficiency, Lowers Cost, and Reduces Component Count Resistor Programmable − Current Limit from 750mA to 2A − Patented Cable Compensation from 0Ω to 0.5Ω ±7.5% CC Accuracy − Compensation of Input /Output Voltage Change − Temperature Compensation − Independent of inductance and Inductor DCR 2% Feedback Voltage Accuracy Up to 93% Efficiency 210kHz Switching Frequency Eases EMI Design 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 ACT4513 is a wide input voltage, high efficiency Active CC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4513 provides up to 2A output current at 210kHz switching frequency. Active CC is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. Active CC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limit. The ACT4513 achieves hig...