LT1376CN85 Linear Technology Corporation, LT1376CN85 Datasheet

LT1376CN85

Manufacturer Part Number

LT1376CN85

Description

DIP-8

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1376CN85.pdf (28 pages)

Specifications of LT1376CN85

Date_code

08+

Current page: 1 of 28
Download datasheet (280Kb)

FEATURES

DESCRIPTIO

APPLICATIO S

The LT

switching regulators. A 1.5A 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

TYPICAL APPLICATIO

** INCREASE L1 TO 10 H FOR LOAD CURRENTS ABOVE 0.6A AND TO 20 H ABOVE 1A

* RIPPLE CURRENT

†

Constant 500kHz Switching Frequency

Easily Synchronizable

Uses All Surface Mount Components

Inductor Size Reduced to 5 H

Saturating Switch Design: 0.4

Effective Supply Current: 2.5mA

Shutdown Current: 20 A

Cycle-by-Cycle Current Limiting

Portable Computers

Battery-Powered Systems

Battery Charger

Distributed Power

TO 25V

FOR INPUT VOLTAGE BELOW 7.5V, SOME RESTRICTIONS MAY APPLY.

SEE APPLICATIONS INFORMATION.

INPUT

10 F TO

1375/LT1376 are 500kHz monolithic buck mode

50 F

C3*

DEFAULT

OUT

= ON

5V Buck Converter

SHDN

GND

LT1376-5

BOOST

BIAS

3.3nF

0.1 F

1N5818

1N914

5 H

L1**

100 F, 10V

SOLID

TANTALUM

OUTPUT**

5V, 1.25A

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

techniques achieve high efficiency at high switching fre-

quency. Efficiency is maintained over a wide output cur-

rent range by using the output to bias the circuitry and by

utilizing a supply boost capacitor to saturate the power

switch. A shutdown signal will reduce supply current to

20 A on both parts. The LT1375 can be externally syn-

chronized from 580kHz to 900kHz with logic level inputs.

The LT1375/LT1376 fit into standard 8-pin PDIP and SO

packages, as well as a fused lead 16-pin SO with much

lower thermal resistance. Full cycle-by-cycle short-cir-

cuit protection and thermal shutdown are provided.

Standard surface mount external parts are used, includ-

ing the inductor and capacitors.

For low input voltage applications with 3.3V output, see

LT1507. This is a functionally identical part that can

operate with input voltages between 4.5V and 12V.

1375/76 TA01

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

1.5A, 500kHz Step-Down

Switching Regulators

100

L = 10 H

OUT

Efficiency vs Load Current

= 10V

0.25

= 5V

LOAD CURRENT (A)

LT1375/LT1376

0.50

0.75

1.00

1375/76 TA02

1.25

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