Active-Semi

ACT4050

Rev 2, 01-Jul-11

- 3 -

www.active-semi.com

Copyright © 2011 Active-Semi, Inc.

Innovative Power

TM

ABSOLUTE MAXIMUM RATINGS

PARAMETER

VALUE

UNIT

IN Supply Voltage

-0.3 to 15

V

SW Voltage

V

BS Voltage

V

EN, FB Voltage

-0.3 to 6

V

Continuous SW Current

Internally Limited

A

46

°C/W

Maximum Power Dissipation

1.8

W

Operating Junction Temperature

-40 to 150

°C

Storage Temperature

-55 to 150

°C

Lead Temperature (Soldering, 10 sec)

300

°C

ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Feedback Voltage

0.8

0.817

0.834

V

High-Side Switch On Resistance

0.15

Ω

Low-Side Switch On Resistance

4.5

Ω

SW Leakage

0

10

µA

High-Side Switch Peak Current

Limit

Duty Cycle = 50%

5.4

A

COMP to Current Limit

Transconductance

2.5

A/V

Error Amplifier Transconductance

650

µA/V

Error Amplifier DC Gain

4000

V/V

Switching Frequency

350

400

450

kHz

Short Circuit Switching Frequency

60

kHz

Maximum Duty Cycle

95

%

Minimum Duty Cycle

0

%

Enable Threshold Voltage

Hysteresis = 0.1V

0.8

1.1

1.4

V

Enable Pull-Up Current

Pin pulled up to 4.5V typically

when left unconnected

2

µA

Supply Current in Shutdown

12

20

µA

IC Supply Current in Operation

0.5

1

mA

Thermal Shutdown Temperature

Hysteresis = 10°C

160

°C

Input Voltage

4.5

15

V

Minimum On Time

Ton_Min

400

ns

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

affect device reliability.