LT3430 Linear Technology Corporation, LT3430 Datasheet

LT3430

Manufacturer Part Number

LT3430

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LT3430.pdf (28 pages)

2.LT3430.pdf (28 pages)

Specifications of LT3430

Case

SOP8

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Download datasheet (327Kb)

FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

TO 60V

5.5V*

Wide Input Range: 5.5V to 60V

3A Peak Switch Current over All Duty Cycles

Constant Switching Frequency:

200kHz (LT3430)

100kHz (LT3430-1)

0.1Ω Switch Resistance

Current Mode

Effective Supply Current: 2.5mA

Shutdown Current: 30µA

1.2V Feedback Reference Voltage

Easily Synchronizable

Cycle-by-Cycle Current Limiting

Small, 16-Pin Thermally Enhanced TSSOP Package

Industrial and Automotive Power Supplies

Portable Computers

Battery Chargers

Distributed Power Systems

*FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY

** SEE LT3430-1 CIRCUIT IN APPLICATIONS INFORMATION SECTION

4.7µF

100V

OFF

0.022µF

SHDN

SYNC

5V, 2A Buck Converter

GND

LT3430**

3.3k

BOOST

BIAS

3430 TA01

220pF

30BQ060

0.68µF

22µH

MMSD914TI

15.4k

4.99k

100µF 10V

SOLID

TANTALUM

OUT

DESCRIPTION

The LT

regulators that accept input voltages up to 60V. A high ef-

ﬁ ciency 3A, 0.1Ω switch is included on the die along with

all the necessary oscillator, control and logic circuitry. A

current mode architecture provides fast transient response

and excellent loop stability.

Special design techniques and a new high voltage process

achieve high efﬁ ciency over a wide input range. Efﬁ ciency

is maintained over a wide output current range by using

the output to bias the circuitry and by utilizing a supply

boost capacitor to saturate the power switch. Patented

circuitry* maintains peak switch current over the full duty

cycle range. A shutdown pin reduces supply current to

30µA and a SYNC pin can be externally synchronized with

a logic level input from 228kHz to 700kHz for the LT3430

or from 125kHz to 250kHz for the LT3430-1.

The LT3430/LT3430-1 are available in a thermally enhanced

16-pin TSSOP package.

200kHz/100kHz Step-Down

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

*US Patent # 6498466

3430/LT3430-1 are monolithic buck switching

Switching Regulators

100

Efﬁ ciency vs Load Current

OUT

High Voltage, 3A,

= 5V

0.5

LT3430/LT3430-1

LOAD CURRENT (A)

1.0

LT3430-1 L = 68µH

LT3430 L =27µH

1.5

= 12V

= 42V

2.0

3430 TA02

2.5

34301fa

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