ACT4533A

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

GENERALDESCRIPTION ACT4533A/Bisawideinputvoltage,highefficiencyActiveCCstep-downDC/DCconverterthatoperatesineitherCV(ConstantOutputVoltage)modeorCC(ConstantOutputCurrent)mode.ACT4533A/Bprovidesupto3.5Aoutputcurrentat125kHzswitchingfrequency. FEATURES •40V

ACT4533A

40 V, 3.0 A Sensorless CC/CV Step-Down DC/DC Converter; • 40 V input voltage surge\n• 36 V steady state operation\n• Up to 3.5 A output current\n• Output voltage up to 12 V\n• 125 kHz switching frequency eases EMI design\n• 91% efficiency (Vout = 5V @ 2.4 A at Vin = 12 V)\n• Stable with low ESR ceramic capacitors to allow low-profile designs\n• Patent Active CC sensorless constant current control improves efficiency and lowers cost\n• Integrated over-voltage protection\n• Excellent EMI performance\n• +/- 7.5% CC accuracy\n• 2% feedback voltage accuracy\n• Advanced feature set\n;

Qorvo's ACT4533A 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. ACT4533A provides up to 3.5 A output current at 125 kHz switching frequency.\nActive CC is a patented control scheme to achieve high-accuracy sensorless constant current control. Active CC eliminates the expensive, high accuracy current sense resistor, making it ideal for Cigarette Lighter Adapter (CLA) applications.\nACT4533A integrates adaptive gate drive to achieve excellent EMI performance, passing the EN55022 Class B EMC standard without adding additional EMI components while maintaining high conversion efficiency.\nProtection features include cycle-by-cycle current limit, thermal shutdown and frequency foldback at short circuit.\nThe only difference between ACT4533A and ACT4533B is that Pin 7 provides OVP for ACT4533A and EN/OVP for ACT4533B.\nACT4533A is available in a SOP-8EP package and require very few external components for operation.\n

ACT4533AB

Wide Input Sensorless CC/CV Step-Down DC/DC Converter

FEATURES •40VInputVoltageSurge •36VSteadyStateOperation •Upto3.5Aoutputcurrent •OutputVoltageupto12V •125kHzSwitchingFrequencyEasesEMIDesign •91%Efficiency(VOUT=5V@2.4AatVIN=12V) •StablewithLow-ESRCeramicCapacitorstoAllow Low-ProfileDesi

ACT4533AYH-T

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

GENERALDESCRIPTION ACT4533A/Bisawideinputvoltage,highefficiencyActiveCCstep-downDC/DCconverterthatoperatesineitherCV(ConstantOutputVoltage)modeorCC(ConstantOutputCurrent)mode.ACT4533A/Bprovidesupto3.5Aoutputcurrentat125kHzswitchingfrequency. FEATURES •40V

ACT4533AYH-T

Wide Input Sensorless CC/CV Step-Down DC/DC Converter

FEATURES •40VInputVoltageSurge •36VSteadyStateOperation •Upto3.5Aoutputcurrent •OutputVoltageupto12V •125kHzSwitchingFrequencyEasesEMIDesign •91%Efficiency(VOUT=5V@2.4AatVIN=12V) •StablewithLow-ESRCeramicCapacitorstoAllow Low-ProfileDesi

ACT4533AYH-T

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

ACT4533AYH-T

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter