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器件3D模型￥ 43.316
LT1376IS8-5#PBF 数据手册 - Linear Technology（凌力尔特）
制造商:
Linear Technology（凌力尔特）
分类:
稳压芯片
封装:
SOIC-8
描述:
Linear Technology**Linear Technology** 提供一系列的步降（降压）切换调节器，带同步和非同步内部开关。 它们可提供 2.25V 到 30V 输入电压和多种切换频率。 它们可用于分布式供电系统、电池供电仪器和负载点电源等多种应用。### 开关电压调节器，Linear Technology**Linear Technology** 的同步型和非同步型内部开关调节器 IC 产品系列效率高、输入电压范围广、且开关频率高达 4 MHz。 该系列控制器包括多种配置：从降压（下降），升压（上压）、降压-升压、正向、隔离、反相和反激控制器。 反激、正向和隔离控制器（一次侧和二次侧）提供解决方案，帮助更换背板型电源转换中使用的直流/直流砖型转换器。
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P6P7P8P16Hot
原理图在P7P8
焊盘布局在P27P28
技术参数、封装参数在P4
应用领域在P1P4P5P7P8P9P10P11P12P13P14P15
电气规格在P3P4P5P6P10P11P24
导航目录
LT1376IS8-5#PBF数据手册
Page:
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1
LT1375/LT1376
13756fd
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
TYPICAL APPLICATIO
U
1.5A, 500kHz Step-Down
Switching Regulators
■
Constant 500kHz Switching Frequency
■
Uses All Surface Mount Components
■
Inductor Size Reduced to 5
µ
H
■
Easily Synchronizable
■
Saturating Switch Design: 0.4Ω
■
Effective Supply Current: 2.5mA
■
Shutdown Current: 20µA
■
Cycle-by-Cycle Current Limiting
■
Portable Computers
■
Battery-Powered Systems
■
Battery Charger
■
Distributed Power
The LT
®
1375/LT1376 are 500kHz monolithic buck mode
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
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
20µA 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.
5V Buck Converter
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
90
80
70
60
50
1.00
1375/76 TA02
0.25
0.50
0.75
1.25
V
OUT
= 5V
V
IN
= 10V
L = 10µH
Efficiency vs Load Current
BOOST
LT1376-5
V
IN
OUTPUT**
5V, 1.25A
* RIPPLE CURRENT ≥ I
OUT
/2
** INCREASE L1 TO 10µH FOR LOAD CURRENTS ABOVE 0.6A AND TO 20µH ABOVE 1A
†
FOR INPUT VOLTAGE BELOW 7.5V, SOME RESTRICTIONS MAY APPLY.
SEE APPLICATIONS INFORMATION.
INPUT
6V
†
TO 25V
1375/76 TA01
C2
0.1µF
C
C
3.3nF
D2
1N5818
C1
100µF, 10V
SOLID
TANTALUM
C3*
10µF TO
50µF
D2
1N914
L1**
5µH
V
SW
FB
BIAS
GND
V
C
DEFAULT
= ON
SHDN
+
+
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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