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LT3694

更新时间： 2024-11-11 11:42:31
品牌 Logo 应用领域
凌特 - Linear 调节器
页数 文件大小 规格书
24页 293K
描述
36V 500mA Step-Down Regulator and 200mA LDO

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中文翻译

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LT3694 数据手册

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LT3645  
36V 500mA Step-Down  
Regulator and 200mA LDO  
FEATURES  
DESCRIPTION  
TheLT®3645isadualoutputregulatorcombininga500mA  
buck regulator and a 200mA low dropout linear regula-  
tor (LDO). The wide input voltage range of 3.6V to 36V  
makes the LT3645 suitable for regulating power from a  
wide variety of sources, including 24V industrial supplies  
and automotive batteries. Its high operating frequency  
allows the use of tiny, low cost inductors and capacitors,  
resulting in a very small solution.  
n
Wide Input Range:  
Operation from 3.6V to 36V  
Overvoltage Lockout Protects Circuit Through  
55V Transients on Input  
n
500mA Output Current Switching Regulator  
n
High Switching Frequency: 750kHz  
n
200mA Low Dropout Linear Regulator  
1.2V to 16V Input; 0.8V to 8V Output  
310mV Dropout Voltage V  
to OUT2  
CC2  
Cycle-by-cycle current limit and frequency foldback pro-  
vide protection against shorted outputs. Soft-start and  
frequency foldback eliminate input current surge during  
start-up.  
n
n
n
n
n
Precision Programmable Undervoltage Lockout  
Short-Circuit Robust  
Internal Soft-Start  
<2μA Shutdown Current  
ThelinearregulatoroperatesfromtheV pinatvoltages  
Small Thermally Enhanced 16-Lead (3mm × 3mm)  
QFN and 12-Lead MSE Packages  
CC2  
down to 1.2V. It supplies 200mA of output current with a  
typical dropout voltage of 310mV.  
Other features of the LT3645 include a <2μA shutdown,  
short circuit protection, soft-start and thermal shutdown.  
The LT3645 is available in the thermally enhanced 16-lead  
(3mm × 3mm) QFN package, or a 12-lead MSE package.  
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
APPLICATIONS  
n
Automotive CMOS Image Sensors  
n
Industrial/Automotive Micro-Controller Supply  
TYPICAL APPLICATION  
Buck Regulator Efficiency  
3.3V/5V Step-Down Converter  
90  
0.1μF  
V
= 5V  
OUT  
BOOST  
15μH  
5V  
6.2V TO 36V  
SW  
V
IN  
300mA  
80  
70  
60  
50  
1μF  
LT3645  
V
OUT  
= 3.3V  
52.3k  
10k  
DA  
FB  
10μF  
ON OFF  
EN/UVLO  
NPG  
EN2  
V
PGOOD  
CC2  
V
= 12V  
3.3V  
200mA  
IN  
OUT2  
0
100  
300  
LOAD CURRENT (mA)  
400  
500  
200  
31.6k  
10k  
2.2μF  
FB2  
3645 TA01b  
GND  
3645 TA01a  
3645f  
1
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