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1956EFE

更新时间： 2024-09-25 12:33:55
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 288K
描述
High Voltage, 1.5A, 500kHz Step-Down

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1956EFE 数据手册

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LT1956/LT1956-5  
High Voltage, 1.5A,  
500kHz Step-Down  
Switching Regulators  
U
FEATURES  
DESCRIPTIO  
The LT®1956/LT1956-5 are 500kHz monolithic buck  
switching regulators with an input voltage capability up to  
60V. Ahighefficiency1.5A, 0.2Ωswitchisincludedonthe  
diealongwithallthenecessaryoscillator,controlandlogic  
circuitry. A current mode architecture provides fast tran-  
sient response and good loop stability.  
■
Wide Input Range: 5.5V to 60V  
■
1.5A Peak Switch Current  
■
Small 16-Pin SSOP or Thermally Enhanced  
TSSOP Package  
Saturating Switch Design: 0.2Ω  
■
■
Peak Switch Current Maintained Over  
Full Duty Cycle Range  
Special design techniques and a new high voltage process  
achieve high efficiency over a wide input range. Efficiency  
ismaintainedoverawideoutputcurrentrangebyusingthe  
output to bias the circuitry and by utilizing a supply boost  
capacitor to saturate the power switch. Patented circuitry  
maintains peak switch current over the full duty cycle  
range*.Ashutdownpinreducessupplycurrentto25µAand  
the device can be externally synchronized from 580kHz to  
700kHz with a logic level input.  
■
Constant 500kHz Switching Frequency  
■
Effective Supply Current: 2.5mA  
■
Shutdown Current: 25µA  
■
1.2V Feedback Reference (LT1956)  
■
5V Fixed Output (LT1956-5)  
Easily Synchronizable  
■
■
Cycle-by-Cycle CUurrent Limiting  
APPLICATIO S  
■
The LT1956/LT1956-5 are available in fused-lead 16-pin  
SSOP and thermally enhanced TSSOP packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
*U.S. PATENT NO. 6,498,466  
High Voltage, Industrial and Automotive  
■
Portable Computers  
■
Battery-Powered Systems  
■
Battery Chargers  
■
Distributed Power Systems  
U
TYPICAL APPLICATIO  
5V Buck Converter  
Efficiency vs Load Current  
MMSD914TI  
100  
V
= 12V  
IN  
L = 18µH  
6
V
OUT  
= 5V  
0.1µF  
V
IN  
90  
80  
70  
60  
50  
BOOST  
10µH  
V
5V  
1A  
OUT  
12V  
(TRANSIENTS  
TO 60V)  
4
2
V
IN  
SW  
V
OUT  
= 3.3V  
2.2µF†  
100V  
CERAMIC  
10MQ060N  
LT1956-5  
22µF  
6.3V  
CERAMIC  
15  
14  
10  
12  
SHDN  
BIAS  
SYNC  
GND  
FB  
V
C
1, 8, 9, 16 11  
0
0.25  
0.50  
0.75  
1.00  
1.25  
220pF  
4.7k  
LOAD CURRENT (A)  
1956 TA02  
4700pF  
†UNITED CHEMI-CON THCS50EZA225ZT  
1956 TA01  
1956f  
1
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