GENERAL DESCRIPTION

ACT4533 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. ACT4533 provides up to 3A output current at 125kHz switching frequency.

FEATURES

• 40V Input Voltage Surge

• 32V Steady State Operation

• Up to 3A Output Current

• Constant Current Output with Input up to 32V

• Output Voltage up to 12V

• 125kHz Switching Frequency Eases EMI Design

• Good EMI Performance to Pass EN55022

   Radiation Regulation without adding EMI

   Components

• Patent Pending Active CC Sensorless Constant

   Current Control

   − Integrated Current Control Improves

      Efficiency, Lowers Cost, and Reduces

      Component Count

• Resistor Programmable

   − Current Limit from 1.5A to 3A

   − Patented Cable Compensation from 0 to 0.3Ω

• ±7.5 CC Accuracy

   − Compensation of Input /Output Voltage Change

   − Temperature Compensation

   − Independent of inductance and Inductor DCR

• 2 Feedback Voltage Accuracy

• Up to 92 Efficiency

• Advanced Feature Set

   − Integrated Soft Start

   − Thermal Shutdown

   − Secondary Cycle-by-Cycle Current Limit

   − Protection Against Shorted ISET Pin

• SOP-8EP Package

APPLICATIONS

• Car Charger/ Adaptor

• Rechargeable Portable Devices

• General-Purpose CC/CV Supply