ACT4525

ACT4525 Rev 1.1, December 17th, 2015 40V/3.5A CV/CC Buck Converter with USB Auto –Detect FEATURES  Pass Apple MFi Test  40V Input Voltage Surge  4.5V-36V Operational Input Voltage  Dual 5.1V Outputs with 1% Accuracy  Up to 3.5A Output Current  2.65A Constant Current Regulation for VOUT1  1.2A Constant Current Regulation for VOUT2  USB Auto-detect Support Apple 2.4A, Samsung and BC1.2 Devices  Hiccup Mode Protection at Output Short  90% Efficiency at Full Load  0.5mA Low Standby Input Current  5.7V Output Over Voltage Protection  Cord Voltage Drop Compensation  Meet EN55022 Class B Radiated EMI Standard  8kV ESD HBM Protection on DP and DM  SOP-8EP Package APPLICATIONS  Car Charger  Cigarette Lighter Adaptor (CLA)  Rechargeable Portable Device  CV/CC regulation DC/DC converter GENERAL DESCRIPTION ACT4525 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. ACT4525 has separated output current limits for dual port CLA applications. With the separated current limits, the CLA can meet Apple’s MFi standard. ACT4525 provides up to 3.5A output current at 125kHz switching frequency. ACT4525 builds in USB autodetect algorithms to recognize Apple, Samsung, and BC1.2 devices to ensure maximum charge current to attached devices. ACT4525 utilize adaptive drive technique to achieve good EMI performance while main 90% efficiency at full load for mini size CLA ...