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LT3480IDD-TRPBF PDF预览

LT3480IDD-TRPBF

更新时间： 2024-09-25 05:43:31
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
24页 293K
描述
36V, 2A, 2.4MHz Step-Down Switching Regulator with 70μA Quiescent Current

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中文翻译

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LT3480IDD-TRPBF 数据手册

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LT3480  
36V, 2A, 2.4MHz Step-Down  
Switching Regulator with  
70µA Quiescent Current  
DESCRIPTION  
FEATURES  
The LT®3480 is an adjustable frequency (200kHz to  
2.4MHz) monolithic buck switching regulator that ac-  
cepts input voltages up to 36V (60V maximum). A high  
efficiency 0.25 switch is included on the die along with  
a boost Schottky diode and the necessary oscillator, con-  
trol, and logic circuitry. Current mode topology is used  
for fast transient response and good loop stability. Low  
ripple Burst Mode operation maintains high efficiency at  
low output currents while keeping output ripple below  
15mV in a typical application. In addition, the LT3480 can  
further enhance low output current efficiency by draw-  
n
Wide Input Range:  
Operation from 3.6V to 36V  
Over-Voltage Lockout Protects Circuits  
through 60V Transients  
n
2A Maximum Output Current  
Low Ripple Burst Mode® Operation  
n
70μA IQ at 12VIN to 3.3VOUT  
Output Ripple < 15mV  
n
Adjustable Switching Frequency: 200kHz to 2.4MHz  
n
Low Shutdown Current: IQ < 1μA  
Integrated Boost Diode  
n
n
Synchronizable Between 250kHz to 2MHz  
ing bias current from the output when V  
is above 3V.  
OUT  
n
Power Good Flag  
Shutdown 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  
n
Saturating Switch Design: 0.25 On-Resistance  
n
0.790V Feedback Reference Voltage  
Output Voltage: 0.79V to 20V  
Soft-Start Capability  
n
flag signals when V  
reaches 86% of the programmed  
OUT  
n
output voltage. The LT3480 is available in 10-Pin MSOP  
and 3mm × 3mm DFN packages with exposed pads for  
low thermal resistance.  
n
Small 10-Pin Thermally Enhanced MSOP and  
(3mm × 3mm) DFN Packages  
, 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.  
APPLICATIONS  
n
Automotive Battery Regulation  
n
Power for Portable Products  
n
Distributed Supply Regulation  
n
Industrial Supplies  
TYPICAL APPLICATION  
3.3V Step-Down Converter  
Efficiency  
V
V
3.3V  
2A  
100  
IN  
OUT  
4.5V TO 36V  
TRANSIENT  
V = 5V  
OUT  
V
BD  
IN  
TO 60V  
90  
80  
70  
60  
50  
RUN/SS  
BOOST  
OFF ON  
14k  
V
= 3.3V  
OUT  
0.47μF  
4.7μH  
V
C
SW  
LT3480  
GND  
4.7μF  
RT  
470pF  
PG  
316k  
V
= 12V  
40.2k  
SYNC  
FB  
IN  
L = 5.6μH  
F = 800 kHz  
100k  
22μF  
0
0.5  
1.0  
LOAD CURRENT (A)  
1.5  
2
3480 TA01  
3480 TA01b  
3480fb  
1
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