ACT4523 Datasheet | Active-Semi

FEATURES - 40V Input Voltage Surge - 38V Steady State Operation - Up to 3A output current - Output Voltage up to 12V - Patent Pending Active CC Sensorless Constant Current Control - Integrated Current Control Improves Efficiency, Lowers Cost, and Reduces ponent Count - Resistor Programmable - Current Limit from 1.5A to 3A - Patented Cable pensation from 0Ω to 0.3Ω - ±7.5% CC Accuracy - pensation of Input /Output Voltage Change - Temperature pensation - Independent of inductance and Inductor DCR - 2% Feedback Voltage Accuracy - Up to 94% Efficiency - 225k Hz 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 ACT4523 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. ACT4523 provides up to 3A output current at 225k Hz 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 ACT4523 achieves higher efficiency than traditional constant current switching regulators by eliminating its associated power loss. Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit. The devices are available in a SOP8EP package and require very few external devices for operation. Input 10V to 40V ENABLE HSB IN SW EN FB ISET GND P C3 22n F 50V L1...