LT1374HVIR Datasheet

IC型號(hào)：
LT1374HVIR
PDF描述：
4.5A, 500kHz Step-Down Switching Regulator
文件大小：
264.57KB
PDF頁(yè)數(shù)：
28頁(yè)
芯片廠家：
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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(chǔ)

Cycle-by-Cycle Current Limiting

The LT

廬

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(chǔ). 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

數(shù)據(jù)列表
LT1374
標(biāo)準(zhǔn)包裝
50
類別
集成電路 (IC)
家庭
PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器
系列
-
類型
降壓（降壓）
輸出類型
可調(diào)式
輸出數(shù)
1
輸出電壓
2.42 V ~ 27.5 V
輸入電壓
5 V ~ 32 V
PWM 型
電流模式
頻率 - 開(kāi)關(guān)
500kHz
電流 - 輸出
4.5A
同步整流器
無(wú)
工作溫度
-40°C ~ 125°C
安裝類型
表面貼裝
封裝/外殼
TO-263-8，D²Pak（7 引線+接片），TO-263CA
包裝
管件
供應(yīng)商設(shè)備封裝
D2PAK-7

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