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LT3685EMSE

更新时间： 2024-02-11 04:31:43
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 281K
描述
36V, 2A, 2.4MHz Step-Down Switching Regulator

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中文翻译

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LT3685EMSE 数据手册

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LT3685  
36V, 2A, 2.4MHz Step-Down  
Switching Regulator  
FEATURES  
DESCRIPTION  
TheLT®3685isanadjustablefrequency(200kHzto2.4MHz)  
monolithic step-down switching regulator that accepts  
input voltages up to 38V operating and 60V maximum. An  
internal overvoltage protection circuit turns off the power  
■
Wide Input Range:  
Operation From 3.6V to 36V  
Overvoltage Lockout Protects Circuit through  
60V Transients  
■
2A Maximum Output Current  
switchwhenV isabove38Vtypical(36Vminimum)which  
IN  
■
Adjustable Switching Frequency: 200kHz to 2.4MHz  
Low Shutdown Current: I < 1μA  
Integrated Boost Diode  
Synchronizable Between 250kHz to 2MHz  
Power Good Flag  
Saturating Switch Design: 0.25 On-Resistance  
0.790V Feedback Reference Voltage  
Output Voltage: 0.79V to 20V  
then allows the part to safely withstand 60V transients. A  
high efficiency 0.25 switch is included on the die along  
with a boost Schottky diode and the necessary oscillator,  
control, and logic circuitry. Current mode topology is  
used for fast transient response and good loop stability.  
The LT3685’s high operating frequency allows the use of  
small, low cost inductors and ceramic capacitors result-  
ing in low output ripple while keeping total solution size  
to a minimum. The low current shutdown mode reduces  
input supply current to less than 1μA while a resistor and  
capacitor on the RUN/SS pin provide a controlled output  
voltage ramp (soft-start). A power good flag signals when  
■
Q
■
■
■
■
■
■
■
■
Soft-Start Capability  
Small 10-Pin Thermally Enhanced MSOP and  
(3mm × 3mm) DFN Packages  
V
reaches89%oftheprogrammedoutputvoltage.The  
OUT  
APPLICATIONS  
LT3685 is available in 10-Pin MSOP and 3mm × 3mm DFN  
■
Automotive Battery Regulation  
packages with exposed pads for low thermal resistance.  
■
Set Top Box  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
■
Distributed Supply Regulation  
■
Industrial Supplies  
■
Wall Transformer Regulation  
TYPICAL APPLICATION  
3.3V Step-Down Converter  
Efficiency  
100  
90  
80  
70  
60  
50  
V
V
3.3V  
2A  
IN  
OUT  
4.5V TO 36V  
TRANSIENT  
TO 60V  
V
= 5V  
OUT  
V
BD  
IN  
RUN/SS  
BOOST  
OFF ON  
14k  
V
= 3.3V  
OUT  
0.47μF  
4.7μH  
V
C
SW  
LT3685  
GND  
4.7μF  
R
T
470pF  
PG  
316k  
V
= 12V  
IN  
40.2k  
SYNC  
FB  
L = 5.6μH  
F = 800 kHz  
100k  
22μF  
0
0.5  
1.0  
LOAD CURRENT (A)  
1.5  
2
3685 TA01b  
3685 TA01  
3685fb  
1
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