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LTC3872EDDB#TRM

更新时间： 2024-01-01 16:22:18
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
32页 497K
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LTC3872EDDB#TRM 数据手册

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LT3759  
Wide Input Voltage Range  
Boost/SEPIC/Inverting  
Controller  
FEATURES  
DESCRIPTION  
The LT®3759 is a wide input range, current mode, DC/DC  
controller which is capable of regulating either positive or  
negative output voltages from a single feedback pin. It can  
be configured as a boost, SEPIC or inverting converter.  
n
Wide V Range: 1.6V to 42V  
IN  
n
Positive or Negative Output Voltage Programming  
with a Single Feedback Pin  
n
PGOOD Output Voltage Status Report  
n
Accurate 50mV SENSE Threshold Voltage  
The LT3759 drives a low side external N-channel power  
MOSFET. An internal LDO regulator draws power from  
n
Programmable Soft-Start  
n
Programmable Operating Frequency (100kHz to 1MHz)  
V or DRIVE to provide up to a 4.75V supply for the gate  
IN  
with One External Resistor  
driver. The fixed frequency, current-mode architecture  
results in stable operation over a wide range of supply  
and output voltages. The operating frequency of LT3759  
can be set over a 100kHz to 1MHz range with an external  
resistor, or can be synchronized to an external clock using  
the SYNC pin.  
n
Synchronizable to an External Clock  
n
Low Shutdown Current < 1μA  
n
INTV Regulator Supplied from V or DRIVE  
CC  
IN  
n
Programmable Input Undervoltage Lockout with  
Hysteresis  
APPLICATIONS  
The LT3759 features soft-start and frequency foldback  
functions to limit inductor current during start-up and  
output short-circuit. A window comparator on the FBX pin  
reportsviathePGOODpin,providingoutputvoltagestatus  
indication. The device is available in a 12-Lead exposed  
pad MSOP package.  
n
Datacom and Industrial Boost, SEPIC and Inverting  
Converters  
n
Distributed Power Supplies  
n
Portable Electronic Equipment  
n
Automotive  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
ThinSOT and No R  
are trademarks of Linear Technology Corporation. All other trademarks  
SENSE  
are the property of their respective owners. Protected by U.S. Patents including 7825665.  
TYPICAL APPLICATION  
2.5V to 36V Input, 12V Output SEPIC Converter  
Excellent for Automotive 12V Post Regulator  
Efficiency vs Output Current  
4.7μF ×2  
V
12V  
L1A  
OUT  
100  
V
V
= 12V  
IN  
IN  
2.5V TO  
0.5A, 2.5V ≤ V ≤ 8V  
IN  
2A, 8V < V ≤ 36V  
C
4.7μF  
×4  
36V  
IN  
IN  
95  
90  
85  
80  
75  
V
105k  
118k  
IN  
C
OUT1  
10μF  
L1B  
EN/UVLO  
LT3759  
GATE  
M1  
SENSE  
100k  
5mΩ  
PGOOD  
DRIVE  
TIE TO GND  
IF NOT USED  
SYNC  
RT  
105K  
C
+
OUT2  
47μF  
×4  
SS  
VC  
FBX  
41.2k  
200kHz  
0
0.5  
1
1.5  
2
2.5  
GND INTV  
CC  
OUTPUT CURRENT (A)  
3759 TA01b  
0.1μF  
7.5k  
22nF  
15.8K  
4.7μF  
3759 TA01a  
3759fb  
1
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