Classification | PRIVATE

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

4 of 19

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ACT4533A/B

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

ELECTRICAL CHARACTERISTICS

(VIN = 12 V, TA = 25 °C, unless otherwise specified.)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input Voltage

10

38

V

Input Voltage Surge

40

V

VIN UVLO Turn - On Voltage

Input Voltage Rising

9.0

9.4

9.7

V

VIN UVLO Hysteresis

Input Voltage Falling

1.1

V

Standby Supply Current

VFB = 1 V

0.9

1.4

mA

Feedback Voltage

792

808

824

mV

Internal Soft-Start time

400

µs

Error Amplifier Transconductance

VFB = VCOMP = 0.808 V,

∆ICOMP = ± 10 µA

650

µA/V

Error Amplifier DC Gain

4000

V/V

Switching Frequency

VFB = 0.808 V

125

kHz

Foldback Switching Frequency

VFB = 0 V

18

kHz

Maximum Duty Cycle

86

%

Minimum On - Time

290

ns

COMP to Current Limit Transconductance

VCOMP = 1.2 V

5.1

A/V

Secondary Cycle-by-Cycle Current Limit

Duty = 0.5

6.8

A

Slope Compensation

Duty = DMAX

3.2

A

ISET Voltage

1.0

V

ISET to IOUT DC Room Temp Current Gain

IOUT/ISET, RISET = 7.87 kΩ

20000

A/A

CC Controller DC Accuracy

RISET = 7.87 kΩ, VOUT = 4.0 V

2650

mA

OVP Pin Voltage (ACT4533A)

OVP Pin Voltage Rising

0.8

V

OVP Pin Voltage (ACT4533A)

OVP Pin Voltage Falling

0.57

V

OVP Pin Voltage (ACT4533B)

OVP Pin Voltage Rising

2.26

V

OVP Pin Voltage (ACT4533B)

OVP Pin Voltage Falling

1.76

V

EN Pin Voltage (ACT4533B)

EN Pin Voltage Rising

0.65

V

EN Pin Voltage (ACT4533B)

EN Pin Voltage Falling

0.59

V

High - Side Switch ON - Resistance

85

mΩ

Thermal Shutdown Temperature

Temperature Rising

155

°C

Thermal Shutdown Temperature Hysteresis

Temperature Falling

25

°C