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LT1371CSW PDF预览

LT1371CSW

更新时间: 2024-09-24 22:55:51
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
16页 323K
描述
500kHz High Efficiency 3A Switching Regulator

LT1371CSW 数据手册

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LT1371  
500kHz High Efficiency  
3A Switching Regulator  
U
DESCRIPTION  
FEATURES  
The LT®1371 is a monolithic high frequency current mode  
switching regulator. It can be operated in all standard  
switching configurations including boost, buck, flyback,  
forward, inverting and “Cuk.” A 3A high efficiency switch  
is included on the die, along with all oscillator, control and  
protection circuitry.  
Faster Switching with Increased Efficiency  
Uses Small Inductors: 4.7µH  
All Surface Mount Components  
Low Minimum Supply Voltage: 2.7V  
Quiescent Current: 4mA Typ  
Current Limited Power Switch: 3A  
Regulates Positive or Negative Outputs  
The LT1371 typically consumes only 4mA quiescent  
current and has higher efficiency than previous parts.  
High frequency switchingallows for very smallinductors  
to be used.  
Shutdown Supply Current: 12µA Typ  
Easy External Synchronization  
U
APPLICATIONS  
New design techniques increase flexibility and maintain  
ease of use. Switching is easily synchronized to an exter-  
nal logic level source. A logic low on the Shutdown pin  
reduces supply current to 12µA. Unique error amplifier  
circuitry can regulate positive or negative output voltage  
while maintaining simple frequency compensation tech-  
niques. Nonlinear error amplifier transconductance re-  
duces output overshoot on start-up or overload recovery.  
Oscillator frequency shifting protects external compo-  
nents during overload conditions.  
Boost Regulators  
Laptop Computer Supplies  
Multiple Output Flyback Supplies  
Inverting Supplies  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
5V to 12V Boost Converter  
12V Output Efficiency  
D1  
100  
5V  
L1*  
4.7µH  
V
= 5V  
MBRS330T3  
IN  
V
OUT  
12V  
90  
80  
70  
60  
50  
V
R1  
IN  
53.6k  
1%  
ON  
V
S/S  
SW  
OFF  
LT1371  
C4**  
*COILCRAFT DO3316P-472 (4.7µH),  
DO3316P-103 (10µH) OR  
+
+
C1**  
22µF  
FB  
C
22µF  
25V  
× 2  
GND  
V
SUMIDA CD104-100MC (10µH)  
25V  
**  
R2  
6.19k  
1%  
AVX TPSD226M025R0200  
MAX I  
OUT  
C2  
0.047µF  
R3  
2k  
L1  
I
OUT  
C3  
0.0047µF  
4.7µH 0.7A  
10µH 0.8A  
0.01  
0.1  
1
LT1371 • TA01  
OUTPUT CURRENT (A)  
LT1371 • TA02  
1

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