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 (303Kb)

FEATURES

TYPICAL APPLICATIO

APPLICATIO S

TO 60V

5.5V*

Industrial and Automotive Power Supplies

Portable Computers

Battery Chargers

Distributed Power Systems

Wide Input Range: 5.5V to 60V

3A Peak Switch Current

Small Thermally Enhanced 16-Pin TSSOP Package

Constant 200kHz Switching Frequency

Saturating Switch Design: 0.1

Peak Switch Current Maintained Over

Full Duty Cycle Range

Effective Supply Current: 2.5mA

Shutdown Current: 30 A

1.2V Feedback Reference Voltage

Easily Synchronizable

Cycle-by-Cycle Current Limiting

†

FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY

UNITED CHEMI-CON

4.7 F 100V

CERAMIC

OFF

†

1, 8, 9, 16

3, 4

0.022 F

SHDN

SYNC

GND

5V, 2A Buck Converter

3.3k

BOOST

LT3430

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

BIAS

220pF

2, 5

30BQ060

0.68 F

22 H

MMSD914TI

15.4k

4.99k

DESCRIPTIO

The LT

lator that accepts input voltages up to 60V. A high efficiency

3A, 0.1 switch is included on the die along with all the nec-

essary 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 efficiency over a wide input range. Efficiency

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 30 A and a SYNC

pin can be externally synchronized from 228kHz to 700kHz

with a logic level input.

The LT3430 is available in a thermally enhanced 16-pin

TSSOP package.

100 F 10V

SOLID

TANTALUM

OUT

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

3430 TA01

3430 is a 200kHz monolithic buck switching regu-

Switching Regulator

200kHz Step-Down

High Voltage, 3A,

100

Final Electrical Specifications

L = 27 H

OUT

Efficiency vs Load Current

= 5V

0.5

LOAD CURRENT (A)

1.0

August 2002

1.5

= 12V

= 42V

LT3430

sn3430 3430is

2.0

3430 TA02

2.5

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