Classification | PRIVATE

Data Sheet Rev. B, January 2025 | Subject to change without notice

2 of 19

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ACT4533A/B

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

ORDERING INFORMATION

PART NUMBER

OPERATION AMBIENT

TEMPERATURE RANGE

OVP/EN PIN

PACKAGE

PINS

PACKING

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

1

HSB

High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver. Connect a

22 nF capacitor from HSB pin to SW pin.

2

IN

Power Supply Input. Bypass this pin with a 10 µF ceramic capacitor to GND, placed as close to the

IC as possible.

3

SW

Power Switching Output to External Inductor.

4

GND

Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return FB, COMP, and

ISET to this GND, and connect this GND to power GND at a single point for best noise immunity.

5

FB

Feedback Input. The voltage at this pin is regulated to 0.808 V. Connect to the resistor divider between

output and GND to set the output voltage.

6

COMP

Error Amplifier Output. This pin is used to compensate the converter.

7

EN/OVP

ACT4533A: OVP input. If the voltage at this pin exceeds 0.8 V, the IC shuts down the high-side switch.

There is a 4 µA pull-up current at this pin.

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 µA pull-up current

at this pin.

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 a large ground copper area with copper and vias.