GENERAL DESCRIPTION

ACT4533A/B is a wide input voltage, high efficiency ActiveCC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4533A/B provides up to 3.5A output current at 125kHz switching frequency.

FEATURES

• 40V Input Voltage Surge

• 36V Steady State Operation

• Up to 3.5A output current

• Output Voltage up to 12V

• 125kHz Switching Frequency Eases EMI Design

• 91 Efficiency (Vout=5V@2.4A at Vin=12V)

• Stable with Low-ESR Ceramic Capacitors to Allow Low-Profile Designs

• Integrated Over Voltage Protection

• Excellent EMI Performance

• Patented ActiveCC Sensorless Constant Current Control Improves Efficiency and Lowers Cost.

• Resistor Programmable

    − Current Limit from 1.5A to 4.0A

    − Patented Cable Compensation from 0 to 0.25Ω

• ±7.5 CC Accuracy

    − Compensation of Input /Output Voltage Change

    − Temperature Compensation

    − Independent of inductance and Inductor DCR

• 2 Feedback Voltage Accuracy

• 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 CV/CC Power Supply