ACT4514

Active-Semi ACT4514 Rev 1, 21-Jul-11 Wide-Input Sensorless CC/CV Step-Down DC/DC Converter FEATURES Up to 40V Input Voltage Up to 1.5A Constant Output Current Output Voltage up to 12V Patent Pending ActiveCC Constant Current Control − Integrated Current Control Improves Efficiency, Lowers Cost, and Reduces Component Count Resistor Programmable Outputs − Current Limit from 400mA to 1500mA − Patented cable compensation from DC Cable Compensation from 0Ω to 0.5Ω 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-8 Package APPLICATIONS Car Charger Rechargeable Portable Devices General-Purpose CC/CV Power Supply GENERAL DESCRIPTION ACT4514 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. ACT4514 provides up to 1.5A output current at 210kHz switching frequency. ActiveCC is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and highbrightness LED drive for architectural lighting. The ACT4514 achieves higher efficiency than traditional constant current switching regulators by elimi...