ACT4523A Wide Input Sensorless CC/CV Step-Down DC/DC Converter FEATURES APPLICATIONS 40V Input Voltage Surge Car Charger / Adaptor Rechargeable Portable Devices 30V Steady State Operation General-Purpose CC/CV Supply Up to 3.5A Output Current Output Voltage up to 12V 250kHz Switching Frequency GENERAL DESCRIPTION 91% Efficiency (Vout = 5V 3.5A at Vin = 12V) ACT4523A is a wide input voltage, high efficiency Patented ActiveCC Sensorless Constant Current ActiveCC step-down DC/DC converter that operates in Control either CV (Constant Output Voltage) mode or CC Integrated Current Control Improves Efficiency, (Constant Output Current) mode. ACT4523A provides Lowers Cost, and Reduces Component Count up to 3.5A output current at 250kHz switching frequency. Resistor Programmable ActiveCC is a patented control scheme to achieve Current Limit from 1.5A to 4.0A highest accuracy with sensorless constant current Patented Cable Compensation from 0 to 0.25 control. ActiveCC eliminates the expensive, high accuracy current sense resistor, making it ideal for 6.5% CC Accuracy battery charging applications and adaptors with Compensation of Input/Output Voltage Change accurate current limit. The ACT4523A achieves higher Temperature Compensation efficiency than traditional constant current switching Independent of inductance and Inductor DCR regulators by eliminating its associated power loss on 2% Feedback Voltage Accuracy the sensing resistor. ACT4523A provides OVP pin for Advanced Feature Set output over voltage protection. Integrated Soft Start Protection features include cycle-by-cycle current limit, Thermal Shutdown thermal shutdown, and frequency foldback at short circuit. The devices are available in a SOP-8EP Secondary Cycle-by-Cycle Current Limit package and require very few external devices for Protection Against Shorted ISET Pin operation. SOP-8EP Package Data Sheet Rev. 1.0, January 19, 2020 Subject to change without notice 1 of 16 www.qorvo.com ACT4523A Wide Input Sensorless CC/CV Step-Down DC/DC Converter ORDERING INFORMATION PART NUMBER OPERATION TEMPERATURE RANGE PACKAGE PINS PACKING ACT4523AYH-T -40C to 85C SOP-8EP 8 TAPE & REEL PIN CONFIGURATION PIN DESCRIPTIONS PIN NAME DESCRIPTION High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver. Connect a 1 HSB 22nF capacitor from HSB pin to SW pin. Power Supply Input. Bypass this pin with a 10F ceramic capacitor to GND, placed as close to the IC 2 IN as possible. 3 SW Power Switching Output to External Inductor. Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return FB, COMP, 4 GND and ISET to this GND, and connect this GND to power GND at a single point for best noise immunity. Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to the resistor divider be- 5 FB tween output and GND to set the output voltage. 6 COMP Error Amplifier Output. This pin is used to compensate the converter. 7 OVP OVP input. If the voltage at this pin exceeds 0.8V, the IC shuts down high-side switch. 8 ISET Output Current Setting Pin. Connect a resistor from ISET to GND to program the output current. Exposed Pad Heat Dissipation Pad. Connect this exposed pad to large ground copper area with copper and vias. Data Sheet Rev. 1.0, January 19, 2020 Subject to change without notice 2 of 16 www.qorvo.com