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LT3681

更新时间： 2024-11-09 05:43:35
品牌 Logo 应用领域
凌特 - Linear 稳压器肖特基二极管开关
页数 文件大小 规格书
24页 368K
描述
36V, 2A, 2.8MHz Step-Down Switching Regulator with Integrated Power Schottky Diode

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中文翻译

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LT3681 数据手册

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LT3681  
36V, 2A, 2.8MHz Step-Down  
Switching Regulator with  
Integrated Power Schottky Diode  
U
DESCRIPTIO  
FEATURES  
TheLT®3681isanadjustablefrequency(300kHzto2.8MHz)  
monolithic buck switching regulator that accepts input  
voltages up to 34V (36V maximum). A high efficiency  
0.18Ω switch is included on the die along with a boost  
Schottky diode and the necessary oscillator, control, and  
logic circuitry. An undedicated power Schottky diode is  
integrated into the LT3681 to minimize the solution size.  
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 LT3681 can further enhance low output  
current efficiency by drawing bias current from the output  
■
Wide Input Voltage Range: 3.6V to 34V Operating,  
36V Maximum  
■
■
2A Maximum Output Current  
Low Ripple Burst Mode® Operation  
50µA I at 12V to 3.3V  
Q
IN  
OUT  
P-P  
Output Ripple < 15mV  
■
■
■
■
■
■
■
■
■
■
Adjustable Switching Frequency: 300kHz to 2.8MHz  
Low Shutdown Current: I < 1µA  
Q
Integrated Boost Diode  
Integrated Power Schottky Diode  
Power Good Flag  
Saturating Switch Design: 0.18Ω On-Resistance  
1.265V Feedback Reference Voltage  
Output Voltage: 1.265V to 20V  
Soft-Start Capability  
when V  
is above 3V. Shutdown reduces input supply  
OUT  
current to less than 1µA while a resistor and capacitor on  
the RUN/SS pin provide a controlled output voltage ramp  
Small 14-Pin Thermally Enhanced  
(4mm x 3mm) DFN Package  
(soft-start). A power good flag signals when V  
reaches  
OUT  
90% of the programmed output voltage. The LT3681  
is available in 14-Pin 4mm x 3mm DFN package with  
exposed pads for low thermal resistance.  
, 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.  
U
APPLICATIO S  
■
Automotive Battery Regulation  
■
Power for Portable Products  
■
Distributed Supply Regulation  
■
Industrial Supplies  
■
Wall Transformer Regulation  
U
TYPICAL APPLICATIO  
5V Step-Down Converter  
Efficiency  
V
V
5V  
2A  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10.0000  
1.0000  
0.1000  
0.0100  
0.0010  
0.0001  
IN  
OUT  
6.3V TO  
34V  
V
BD  
IN  
RUN/SS  
BOOST  
OFF ON  
20k  
0.47  
F
L
6.8  
H
V
C
SW  
DC  
DA  
LT3681  
4.7  
F
RT  
PG  
330pF  
V
V
= 12V  
IN  
OUT  
BIAS  
FB  
= 3.3V  
590k  
L = 4.7  
H
60.4k  
GND  
F = 800 kHz  
200k  
22  
F
0.0001 0.001  
0.01  
0.1  
(A)  
1 10  
I
LOAD  
3681 TA01b  
3681 TA01  
L: NEC PLC-0745-6R8  
3681f  
1
1234567...24

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