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ACT4070YH

Wide Input 3A Step Down Converter

Active-Semi, Inc 

ACT4070

ABSOLUTE MAXIMUM RATINGS

PARAMETER

IN to G

EN to G

SW to G

BS to SW

FB, COMP to G

Continuous SW Current

Junction to Ambient Thermal Resistance (θJA)

Maximum Power Dissipation

Operating Junction Temperature

Storage Temperature

Lead Temperature (Soldering, 10 sec)

VALUE

-0.3 to +34

-0.3 to VIN + 0.3

-1 to VIN + 1

-0.3 to +8

-0.3 to 6

Internally limited

46

1.8

-40 to 150

-55 to 150

300

UNIT

V

V

V

V

V

A

°C/W

W

°C

°C

°C

: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may

affect device reliability.

ELECTRICAL CHARACTERISTICS

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

PARAMETER

SYMBOL

TEST CONDITIONS

MIN TYP MAX UNIT

Input Voltage

Feedback Voltage

High-Side Switch On Resistance

Low-Side Switch On Resistance

SW Leakage

Current Limit

COMP to Current Limit Transcon-

ductance

Error Amplifier Transconductance

Error Amplifier DC Gain

Switching Frequency

Short Circuit Switching Frequency

Maximum Duty Cycle

Minimum Duty Cycle

Enable Threshold Voltage

Enable Pull Up Current

Supply Current in Shutdown

IC Supply Current in Operation

Thermal Shutdown Temperature

VIN

VFB

RONH

RONL

ILIM

GCOMP

GEA

AVEA

fSW

DMAX

VOUT = 2.5V, ILOAD = 0A to 3A

VEN = 0, VIN = 12V, VSW = 0V

4.5

30 V

1.198 1.222 1.246 V

100

mΩ

10

Ω

0 10 µA

3.5 5

A

ΔILOAD/ΔICOMP

3

A/V

ΔICOMP = ±10µA

550

µA/V

4000

V/V

340 400 460 kHz

VFB = 0V

40

kHz

VFB = 1.1V, PWM mode

VFB = 1.4V, PFM mode

90

%

0

%

Hysteresis = 0.1V

0.7 1 1.3 V

Pin pulled up to VIN when left uncon-

nected

2

µA

VEN = 0

6 20 µA

VEN = 3V, not switching

Hysteresis = 10°C

0.85 2 mA

160

°C

Innovative Products. Active Solutions.

-3-

Copyright © 2006 Active-Semi, Inc.

www.active-semi.com

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