LT1374CR-SYNC Datasheet

IC型号：
LT1374CR-SYNC
PDF描述：
Linear Technology [4.5A, 500kHz Step-Down Switching Regulat...
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LT1374

4.5A, 500kHz Step-Down

Switching Regulator

FEATURES

DESCRIPTIO

Constant 500kHz Switching Frequency

Easily Synchronizable

Uses All Surface Mount Components

Inductor Size Reduced to 1.8

碌

Saturating Switch Design: 0.07鈩?/div>

Effective Supply Current: 2.5mA

Shutdown Current: 20碌A

Cycle-by-Cycle Current Limiting

The LT

庐

1374 is a 500kHz monolithic buck mode switching

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碌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.

APPLICATIO S

Portable Computers

Battery-Powered Systems

Battery Chargers

Distributed Power

TYPICAL APPLICATIO

5V Buck Converter

1N914

0.27碌F

INPUT

6V TO 25V

BOOST

100

C3*

10碌F TO

50碌F

DEFAULT

= ON

OUTPUT**

5V, 4.25A

EFFICIENCY (%)

L1**

5碌H

0.5

1.0

1.5 2.0 2.5 3.0

LOAD CURRENT (A)

3.5

4.0

LT1374-5 BIAS

SHDN

GND

SENSE

1.5nF

MBRS330T3

100碌F, 10V

SOLID

TANTALUM

1374 TA01

* RIPPLE CURRENT RATING

鈮?/div>

OUT

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

SEE APPLICATIONS INFORMATION

Efficiency vs Load Current

OUT

= 5V

= 10V

L = 10碌H

1374 TA02

LT1374CR-SYNC PDF文件相关型号

LT1374CS8-5SYNC

LT1374CR-SYNC 产品属性

数据列表
LT1374
标准包装
50
类别
集成电路 (IC)
家庭
PMIC - 稳压器 - DC DC 开关稳压器
系列
-
类型
降压（降压）
输出类型
可调式
输出数
1
输出电压
2.42 V ~ 21.5 V
输入电压
5 V ~ 25 V
PWM 型
电流模式
频率 - 开关
500kHz
电流 - 输出
4.5A
同步整流器
无
工作温度
0°C ~ 125°C
安装类型
表面贴装
封装/外壳
TO-263-8，D²Pak（7 引线+接片），TO-263CA
包装
管件
供应商设备封装
D2PAK-7

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