LT1374HV Linear Technology Corporation, LT1374HV Datasheet

LT1374HV

Manufacturer Part Number

LT1374HV

Description

TO-263

Manufacturer

Linear Technology Corporation

Datasheets

1.LT1374HV.pdf (28 pages)

2.LT1374HV.pdf (32 pages)

Specifications of LT1374HV

Date_code

05+

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Download datasheet (262Kb)

FEATURES

TYPICAL APPLICATIO

APPLICATIO S

** INCREASE L1 TO 10 H FOR LOAD CURRENTS ABOVE 3.5A AND TO 20 H ABOVE 4A

6V TO 25V

* RIPPLE CURRENT RATING I

SEE APPLICATIONS INFORMATION

Constant 500kHz Switching Frequency

Easily Synchronizable

Uses All Surface Mount Components

Inductor Size Reduced to 1.8 H

Saturating Switch Design: 0.07

Effective Supply Current: 2.5mA

Shutdown Current: 20 A

Cycle-by-Cycle Current Limiting

Portable Computers

Battery-Powered Systems

Battery Chargers

Distributed Power

INPUT

10 F TO

50 F

C3*

DEFAULT

= ON

OUT

5V Buck Converter

SHDN

GND

LT1374-5

BOOST

SENSE

BIAS

0.27 F

1.5nF

MBRS330T3

1N914

5 H

L1**

1374 TA01

100 F, 10V

SOLID

TANTALUM

OUTPUT**

5V, 4.25A

DESCRIPTIO

The LT

regulator. A 4.5A switch is included on the die along with

all the necessary oscillator, control and logic circuitry. High

switching frequency allows a considerable reduction in the

size of external components. The topology is current mode

for fast transient response and good loop stability. Both

fixed output voltage and adjustable parts are available.

A special high speed bipolar process and new design tech-

niques achieve high efficiency at high switching frequency.

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.

The LT1374 fits into standard 7-pin DD, TO-220 and fused

lead SO-8 packages. Full cycle-by-cycle short-circuit

protection and thermal shutdown are provided. Standard

surface mount external parts are used, including the

inductor and capacitors. There is the optional function of

shutdown or synchronization. A shutdown signal reduces

supply current to 20 A. Synchronization allows an exter-

nal logic level signal to increase the internal oscillator from

580kHz to 1MHz.

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

4.5A, 500kHz Step-Down

1374 is a 500kHz monolithic buck mode switching

Switching Regulator

100

L = 10 H

OUT

0.5

Efficiency vs Load Current

= 10V

= 5V

1.0

LOAD CURRENT (A)

1.5

2.0

2.5

3.0

LT1374

3.5

1374 TA02

4.0

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