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LT3500HDD-TRPBF PDF预览

LT3500HDD-TRPBF

更新时间： 2024-11-04 05:43:31
品牌 Logo 应用领域
凌特 - Linear 稳压器控制器
页数 文件大小 规格书
28页 287K
描述
Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller

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中文翻译

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LT3500HDD-TRPBF 数据手册

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LT3500  
Monolithic 2A Step-Down  
Regulator Plus Linear  
Regulator/Controller  
FEATURES  
DESCRIPTION  
The LT®3500 is a current mode PWM step-down DC/DC  
converterwithaninternal2.3Aswitch.Thewideinputrange  
of 3V to 40V makes the LT3500 suitable for regulating  
power from a wide variety of sources, including automo-  
tive batteries, 24V industrial supplies and unregulated  
wall adapters.  
n
Wide Input Range: 3V to 36V Operating,  
40V Maximum  
n
Short-Circuit Protected Over Full Input Range  
n
2A Output Current Capability  
n
Adjustable/Synchronizable Fixed Frequency  
Operation from 250kHz to 2.2MHz  
n
Soft-Start/Tracking Capability  
Resistor-programmable 250kHz to 2.2MHz frequency  
range and synchronization capability enable optimization  
between efficiency and external component size. Cycle-  
by-cycle current limit, frequency foldback and thermal  
shutdown provide protection against a shorted output.  
The soft-start feature controls the ramp rate of the output  
voltage, eliminating input current surge during start-up,  
and also provides output tracking.  
n
Output Adjustable Down to 0.8V  
n
Adjustable Linear Regulator/Driver with 13mA  
Output Capability  
n
Power Good Comparator with Complimentary  
Outputs  
Low Shutdown Current: 12μA  
n
n
Thermally Enhanced 3mm × 3mm DFN or 16-Pin  
MSOP Package  
The LT3500 contains an internal NPN transistor with feed-  
back control which can be configured as a linear regulator  
or as a linear regulator controller.  
APPLICATIONS  
n
Automotive Battery Regulation  
n
Industrial Control  
TheLT3500’slowcurrentshutdownmode(<12μA)enables  
easy power management in battery-powered systems.  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
Wall Transformer Regulation  
n
Distributed Power Regulation  
TYPICAL APPLICATION  
Dual Step-Down Converters  
Switching Converter Efficiency  
Output Voltage Ripple  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
IN  
6V TO 36V  
2.2μF  
V
BST  
SW  
IN  
0.47μF  
6.8μH  
LT3500  
V
5V  
1A  
OUT1  
V
= 5V AT 1A  
AC COUPLED  
2mV/DIV  
OUT1  
B240A  
SHDN  
SS  
42.2k  
22μF  
0.47μF  
FB  
PG  
PG  
8.06k  
V
= 3.3V AT 1A  
AC COUPLED  
2mV/DIV  
OUT2  
R
V
SYNC LDRV  
T/  
V
I
= 12V  
= 0A  
IN  
OUT2  
53.6k  
330pF  
C
1k  
V
24.9k  
8.06k  
FREQUENCY = 800kHz  
OUT2  
3.3V  
1A  
LFB  
3500 TA01c  
500ns/DIV  
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0  
40.2k  
22μF  
LOAD CURRENT (A)  
3500 TA01b  
3500 TA01a  
3500fb  
1
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