ACT4527

ACT4527 Rev 1, December 28th, 2015 40V/3.0A CV/CC Buck Converter Featuring USB-PD FEATURES  USB-PD Support  40V Input Voltage Surge  4.5V-36V Operational Input Voltage  5.1V/9.1V/12.1V Output with +/-1% Accuracy  Up to 3.0A Output current  Constant Current Regulation Limit  Hiccup Mode Protection at Output Short  >90% Efficiency at Full Load  0.5mA Low Standby Input Current  5.7V/10.1V/13.5V Output Over-voltage Protection for 5.1V/9.1V/12.1V Outputs  Cord Voltage Compensation  Meet EN55022 Class B Radiated EMI Standard  SOP-8EP Package APPLICATIONS  Car Charger  Cigarette Lighter Adaptor (CLA)  Rechargeable Portable Device  CV/CC regulation DC/DC converter GENERAL DESCRIPTION ACT4527 is a wide input voltage, high efficiency step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4527 has an interface for USB-PD control via a tri-state digital pin. Vout is 5.1V if this pin is floating, Vout is 9.1V when this pin voltage is less than 0.8V and Vout is 12.1V while this pin voltage is more than 2.0V. ACT4527 has accurate output current limits under constant current regulation. It provides up to 3.0A output current at 125kHz switching frequency. ACT4527 utilizes adaptive drive technique to achieve good EMI performance while main >90% efficiency at full load for mini size CLA designs. It also has output short circuit protection with hiccup mode. The average output current is reduced to below 6mA...