LT3479

1

3479fb

TYPICAL APPLICATION

DESCRIPTION

3A, Full Featured DC/DC

Converter with Soft-Start

and Inrush Current Protection

The LT

DC/DC converter with an internal 3A, 42V switch. Efficien-

cies of up to 89% can be achieved in typical applications. It

features a programmable soft-start function to limit induc-

tor current during start-up and inrush current protection

to protect the LT3479 during shorts and line transients.

Both inputs of the error amplifier are available to the user

allowing positive and negative output voltages. Through

an external resistor, the user can program the switch-

ing frequency from 200kHz to 3.5MHz. The low profile

(0.75mm) 14-pin, 4mm

× 3mm DFN package provides

excellent thermal performance in a small footprint. The

LT3479 is also available in a thermally enhanced 16-pin

TSSOP package.

5V to 12V Boost Converter

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

FEATURES

APPLICATIONS

3.5MHz

Hot Plugging

(4mm

× 3mm) DFN and 16-Lead TSSOP Packages

5V to 12V Efficiency

200k

23.2k

17.8k

10k

2.2μF

5V

4.7μH

3479 TA01

FBN

SW

L

GND

SHDN

SS

LT3479

FBP

2.2nF

10μF

12V

0.8A

10nF

0

70

80

0.8

3479 TA02

60

0.2

0.4

0.6

90

65

75

85