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LT1432CN8 PDF预览

LT1432CN8

更新时间： 2024-01-09 16:18:30
品牌 Logo 应用领域
凌特 - Linear 稳压器开关控制器
页数 文件大小 规格书
28页 609K
描述
5V High Efficiency Step-Down Switching Regulator Controller

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中文翻译

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LT1432CN8 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
零件包装代码：DIP包装说明：DIP, DIP8,.3
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.81模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：VOLTAGE-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：30 V最小输入电压：6 V
标称输入电压：12 VJESD-30 代码：R-PDIP-T8
JESD-609代码：e0长度：9.78 mm
功能数量：1端子数量：8
最高工作温度：70 °C最低工作温度：
最大输出电流：2 A封装主体材料：PLASTIC/EPOXY
封装代码：DIP封装等效代码：DIP8,.3
封装形状：RECTANGULAR封装形式：IN-LINE
认证状态：Not Qualified座面最大高度：4.445 mm
子类别：Switching Regulator or Controllers最大供电电流 (Isup)：0.5 mA
表面贴装：NO切换器配置：SINGLE
技术：BIPOLAR温度等级：COMMERCIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
宽度：7.62 mmBase Number Matches：1

LT1432CN8 数据手册

 浏览型号LT1432CN8的Datasheet PDF文件第2页浏览型号LT1432CN8的Datasheet PDF文件第3页浏览型号LT1432CN8的Datasheet PDF文件第4页浏览型号LT1432CN8的Datasheet PDF文件第5页浏览型号LT1432CN8的Datasheet PDF文件第6页浏览型号LT1432CN8的Datasheet PDF文件第7页 
LT1432  
5V High Efficiency Step-Down  
Switching Regulator Controller  
U
DESCRIPTIO  
EATURE  
S
F
■
■
■
■
■
■
■
■
The LT1432 is a control chip designed to operate with the  
LT1170/LT1270 family of switching regulators to make a  
veryhighefficiency5Vstep-down(buck)switchingregula-  
tor. A minimum of external components is needed.  
Accurate Preset +5V Output  
Up to 90% Efficiency  
Optional Burst Mode for Light Loads  
Can be Used with Many LTC Switching ICs  
Accurate Ultra-Low-Loss Current Limit  
Operates with Inputs from 6V to 30V  
Shutdown Mode Draws Only 15µA  
Uses Small 50µH Inductor  
Includedisanaccuratecurrentlimitwhichusesonly60mV  
sense voltage and uses “free” PC board trace material for  
the sense resistor. Logic controlled electronic shutdown  
mode draws only 15µA battery current. The switching  
regulator operates down to 6V input.  
The LT1432 has a logic controlled “burst” mode to achieve  
highefficiencyatverylightloadcurrents(0to100mA)such  
as memory keep-alive. In normal switching mode, the  
standby power loss is about 60mW, limiting efficiency at  
light loads. In burst mode, standby loss is reduced to  
approximately 15mW. Output current in this mode is  
typically in the 5mA to 100mA range.  
O U  
PPLICATI  
S
A
■
■
■
■
Laptop and Palmtop Computers  
Portable Data-Gathering Instruments  
DC Bus Distribution Systems  
Battery-Powered Digital Widgets  
The LT1432 is available in 8-pin surface mount and DIP  
packages. The LT1170/LT1270 family will also be available  
in a surface mount version of the 5-pin TO-220 package.  
For 3.3V versions contact Linear Technology Corporation.  
U
O
TYPICAL APPLICATI  
V
IN  
Efficiency  
10µH  
V
V
IN  
SW  
3A  
+
LT1170  
LT1271  
C1  
330µF  
35V  
+
OPTIONAL  
FB  
100  
90  
100µF  
16V  
OUTPUT  
FILTER  
V
GND  
D2  
C
1N4148  
C6  
0.02µF  
NORMAL MODE  
(USE AMPS SCALE)  
C3  
+
R1  
C5  
4.7µF  
TANT  
680Ω  
0.03µF  
L1  
50µH  
R2*  
0.013Ω  
C4  
0.1µF  
V
OUT  
80  
×
5V  
+
3A**  
BURST MODE  
(USE mA SCALE)  
D1  
MBR330p  
C2  
+
390µF  
16V  
V
V
C
DIODE  
70  
V
V
V
IN  
LIM  
LT1432  
GND  
LT1271, L = 50µH  
MODE  
OUT  
MODE LOGIC  
220pF  
60  
* R2 IS MADE FROM PC BOARD  
COPPER TRACES.  
0
0
3A  
1A  
2A  
20mA  
40mA  
60mA  
<0.3V = NORMAL MODE  
>2.5V = SHUTDOWN  
OPEN = BURST MODE  
** MAXIMUM CURRENT IS DETERMINED  
BY THE CHOICE OF LT1070 FAMILY.  
SEE APPLICATION SECTION.  
LT1432 TA02  
LT1432 TA01  
Figure 1. High Efficiency 5V Buck Converter  
1
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中文翻译

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