ACT4533A/B Wide Input Sensorless CC/CV Step-DownDC/DC Converter FEATURES APPLICATIONS 40 V Input Voltage Surge Car Charger/ Adaptor 36 V Steady State Operation Rechargeable Portable Device Up to 3.5 A output current CV/CC regulation DC/DC converter Output Voltage up to 12 V 125 kHz Switching Frequency Eases EMI Design GENERAL DESCRIPTION 91% Efficiency (V = 5 V 2.4 A at V = 12 V) OUT IN ACT4533A/B is a wide input voltage, high efficiency Stable with Low-ESR Ceramic Capacitors to Allow ActiveCC step-down DC/DC converter that operates Low-Profile Designs in either CV (Constant Output Voltage) mode or Integrated Over Voltage Protection CC (Constant Output Current) mode. ACT4533A/B Excellent EMI Performance provides up to 3.5 A output current at 125 kHz switching frequency. Patented ActiveCC Sensorless Constant Current Control Improves Efficiency and Lowers Cost. ActiveCC is a patented control scheme to achieve high- Resistor Programmable accuracy sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense Current Limit from 1.5 A to 4.0 A resistor, making it ideal for CLA applications. Patented Cable Compensation from 0 to 0.25 ACT4533A/B integrates adaptive gate drive to 7.5% CC Accuracy achieve excellent EMI performance passing Compensation of Input /Output Voltage Change EN55022 Class B EMC standard without adding Temperature Compensation additional EMI components while maintaining high conversion efficiency. Independent of inductance and Inductor DCR 2% Feedback Voltage Accuracy Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short cir- Advanced Feature Set cuit. The devices are available in a SOP-8EP package Integrated Soft Start and require very few external devices for operation. Thermal Shutdown The only difference between ACT4533A and Secondary Cycle-by-Cycle Current Limit ACT4533B is that Pin 7 provides OVP for ACT4533A Protection Against Shorted ISET Pin and EN/OVP for ACT4533B. SOP-8EP Package Data Sheet Rev. A, September 2019 Subject to change without notice 1 of 18 www.qorvo.com 2020 Qorvo US, Inc. All rights reserved. ACT4533A/B Wide Input Sensorless CC/CV Step-DownDC/DC Converter ORDERING INFORMATION OPERATION AMBIENT PART NUMBER OVP/EN PIN PACKAGE PINS PACKING TEMPERATURE RANGE ACT4533AYH-T -40 C to 85 C OVP SOP-8EP 8 TAPE & REEL ACT4533BYH-T -40 C to 85 C OVP/EN 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 22 nF capacitor from HSB pin to SW pin. Power Supply Input. Bypass this pin with a 10 F ceramic capacitor to GND, placed as close to the 2 IN IC 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, and 4 GND 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 0.808 V. Connect to the resistor divider between 5 FB output and GND to set the output voltage. 6 COMP Error Amplifier Output. This pin is used to compensate the converter. ACT4533A: OVP input. If the voltage at this pin exceeds 0.8 V, the IC shuts down high-side switch. There is a 4 A pull-up current at this pin. 7 EN/OVP ACT4533B: EN/OVP input. If the voltage at this pin is below 0.65 V, the IC remains shut-off, if the Voltage at this pin exceeds 2.26 V, the IC shuts down high side switch. There is a 4 A pull-up current at this pin. 8 ISET Output Current Setting Pin. Connect a resistor from ISET to GND to program the output current. Heat Dissipation Pad. Connect this exposed pad to large ground copper area with copper and vias. Exposed Pad Data Sheet Rev. A, September 2019 Subject to change without notice 2 of 18 www.qorvo.com 2020 Qorvo US, Inc. All rights reserved.