LT3467/LT3467A

1

3467afe

TYPICAL APPLICATION

DESCRIPTION

1.1A Step-Up DC/DC

Converter with

Integrated Soft-Start

The LT

42V, 1.1A switch with a soft-start function. Pin compatible

device to deliver high current outputs in a small footprint.

The LT3467 switches at 1.3MHz, allowing the use of tiny,

low cost and low height inductors and capacitors. The

LT3467A switches at 2.1MHz, allowing the use of even

smaller components. High inrush current at start-up is

eliminated using the programmable soft-start function.

A single external capacitor sets the current ramp rate. A

constant frequency current mode PWM architecture results

in low, predictable output noise that is easy to filter.

The high voltage switch on the LT3467/LT3467A is rated

at 42V, making the devices ideal for boost converters up

to 40V as well as SEPIC and flyback designs. The LT3467

can generate 5V at up to 540mA from a 3.3V supply or

5V at 450mA from four alkaline cells in a SEPIC design.

The LT3467A can generate 5V at up to 430mA from a 3.3V

supply or 15V at 135mA from a 3.3V supply. The LT3467/

LT3467A are available in a low profile (1mm) 6-lead SOT-23

package and tiny 3mm

× 2mm DFN package.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

Single Li-Ion Cell to 5V Boost Converter

FEATURES

APPLICATIONS

× 2mm)

DFN Package

GND

SW

SS

FB

2.6V TO

4.2V

2.7μH

402k

LT3467

3467 TA01a

15μF

3.3pF

4.7μF

133k

5V

SHDN

OFF ON

0.047μF

600

95

90

85

80

75

70

65

60

55

50

3467 TA01b

100

900

200 300 400 500

700 800

Efficiency