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LT3980

更新时间： 2024-09-29 14:58:15
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
24页 326K
描述
具 85μA 静态电流的 58V、2A、2.4MHz 降压型开关稳压器

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中文翻译

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LT3980 数据手册

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LT3980  
58V, 2A, 2.4MHz  
Step-Down Switching Regulator  
with 85µA Quiescent Current  
FeaTures  
DescripTion  
The LT®3980 is an adjustable frequency (100kHz to  
■
Wide Input Range: Operation from 3.6V to 58V  
■
2.4MHz)monolithicbuckswitchingregulatorthataccepts  
input voltages up to 58V (80V transient). A high efficiency  
200mΩ 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. Catch diode  
current sense (DA pin) protects the circuit during input  
voltage transients even when a high switching frequency  
is used. 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  
LT3980 can further enhance low output current efficiency  
Overvoltage Lockout Protects Circuits Through 80V  
Transients  
■ꢀ  
2A Maximum Output Current  
Low Ripple (<15mV ) Burst Mode® Operation:  
■ꢀ  
P-P  
IN  
I = 85µA at 12V to 3.3V  
Q
OUT  
■
■
■
Adjustable Switching Frequency: 100kHz to 2.4MHz  
Low Shutdown Current: I < 1µA  
Q
Catch Diode Current Sense Protects Circuit Through  
Short-Circuit and Input Overvoltage  
Synchronizable Between 250kHz to 2MHz  
Power Good Flag  
■
■
■
■
■
■
Saturating Switch Design: 200mΩ On-Resistance  
Thermal Protection  
Soft-Start Capability  
Small 16-Pin Thermally Enhanced MSOP and  
3mm × 4mm DFN Packages  
by drawing bias current from the output when V  
is  
OUT  
above 3V. 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 flag signals when V  
reaches 91% of  
OUT  
applicaTions  
the programmed output voltage. The LT3980 is available  
in 16-pin MSOP and 3mm × 4mm DFN packages with  
exposed pads for low thermal resistance.  
■
Automotive Battery Regulation  
■
Distributed Supply Regulation  
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
■
Industrial Supplies  
Wall Transformer Regulation  
■
Typical applicaTion  
5V Step-Down Converter  
Efficiency, VOUT = 5V  
V
5V  
2A  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
OUT  
V
IN  
V
= 12V  
6.5V TO 58V  
TRANSIENT  
TO 80V  
IN  
V
BD  
IN  
V
= 24V  
= 48V  
IN  
RUN/SS  
BOOST  
OFF ON  
4.75k  
V
IN  
0.47µF  
10µH  
22pF  
V
C
SW  
LT3980  
GND  
10µF  
RT  
1nF  
PG  
DA  
FB  
536k  
97.6k  
SYNC  
f = 400kHz  
D = DIODES, INC. SBR3U100LP  
100k  
47µF  
0
0.5  
1
1.5  
2
I
(A)  
LOAD  
3980 TA01  
3980 TA01b  
3980fa  
For more information www.linear.com/LT3980  
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