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ACT4455

36V/5A Step Down DC/DC Converter

Active-Semi, Inc 

ACT4455

Rev 2, 21-Nov-12

ELECTRICAL CHARACTERISTICS

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

PARAMETER

SYMBOL TEST CONDITIONS

Feedback Voltage

Error Amplifier Voltage Gain

Error Amplifier Transconductance

Over Voltage Protection Threshold

Max E/A Source Current

Max E/A Sink Current

High-Side Switch ON-Resistance

Low-Side Switch ON-Resistance

Maximum Duty Cycle

Switching Frequency

Upper Switch Current Limit

COMP to Current Limit

Transconductance

VFB

AEA

GEA

VOVP

ISRCMAX

ISINKMAX

RDS(ON)1

RDS(ON)2

DMAX

FSW

ILIM

GCOMP

7.5V ≤ VIN ≤ 40V

∆ICOMP = ± 10µA

VFB = 0.5V

VFB = 1.0V

At 25°C

Duty Cycle = 65%

Minimum on Time

Input Under Voltage Lockout Thresh-

old

TON_MIN

VIN_Rise

VIN Rising

Input Under Voltage Lockout Hystere-

sis

VIN_Falling

VIN Falling

Internal Soft Startup Time

CS1 reference voltage

CS2 reference voltage

Frequency Foldback Threshold

Cord Compensation

TSS

VCS1

VCS2

VFB_Foldback

VIN = 12V, RFB1=200k, IOUT =

5A

Thermal Shutdown

MIN

798

180

6.75

113

113

TYP

808

4000

650

41

120

120

38

5

80

200

6.5

MAX

818

220

UNIT

mV

V/V

µA/V

V

µA

µA

mΩ

Ω

%

kHz

A

5

A/V

250

ns

7

7.25

V

650

mV

3.0

ms

116 119 mV

116 119 mV

0.65

V

0.35

V

150

°C

Innovative PowerTM

-4-

www.active-semi.com

Copyright © 2012 Active-Semi, Inc.

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