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LT3957A

更新时间： 2024-11-23 11:45:15
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
28页 495K
描述
Boost, Flyback, SEPIC and Inverting Converter

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中文翻译

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LT3957A 数据手册

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LT3957A  
Boost, Flyback, SEPIC and  
Inverting Converter  
with 5A, 40V Switch  
FEATURES  
DESCRIPTION  
The LT®3957A is a wide input range, current mode DC/DC  
converter which is capable of generating either positive or  
negative output voltages. It can be configured as either a  
boost, flyback, SEPIC or inverting converter. It features  
an internal low side N-channel power MOSFET rated for  
40V at 5A and driven from an internal regulated 5.2V  
supply. The fixed frequency, current-mode architecture  
results in stable operation over a wide range of supply  
and output voltages.  
n
Wide Input Voltage Range: 3V to 40V  
n
Single Feedback Pin for Positive or Negative  
Output Voltage  
n
Internal 5A/40V Power Switch  
n
Current Mode Control Provides Excellent Transient  
Response  
n
Programmable Operating Frequency (100kHz to  
1MHz) with One External Resistor  
n
Synchronizable to an External Clock  
n
Low Shutdown Current < 1µA  
The operating frequency of LT3957A can be set with an  
external resistor over a 100kHz to 1MHz range, and can  
be synchronized to an external clock using the SYNC pin.  
A minimum operating supply voltage of 3V, and a low  
shutdown quiescent current of less than 1µA, make the  
LT3957A ideally suited for battery-powered systems.  
n
Internal 5.2V Low Dropout Voltage Regulator  
n
Programmable Input Undervoltage Lockout with  
Hysteresis  
Programmable Soft-Start  
n
n
Thermally Enhanced QFN (5mm × 6mm) Package  
The LT3957A features soft-start and frequency foldback  
functions to limit inductor current during start-up. The  
LT3957A has improved load transient performance com-  
pared to the LT3957.  
APPLICATIONS  
n
Automotive  
n
Telecom  
n
Industrial  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
No R  
and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks  
SENSE  
are the property of their respective owners. Protected by U.S. Patents, including 7825665.  
TYPICAL APPLICATION  
High Efficiency Output Boost Converter  
Efficiency vs Output Current  
10µH  
V
OUT  
100  
95  
90  
85  
80  
75  
70  
V
IN  
V
= 12V  
24V  
IN  
4.5V TO 16V  
600mA  
10µF  
×2  
10µF  
200k  
V
SW  
IN  
EN/UVLO  
GND  
95.3k  
LT3957A  
SGND  
SYNC  
SENSE1  
226k  
SENSE2  
FBX  
INTV  
CC  
RT SS  
V
C
15.8k  
41.2k  
300kHz  
6.8k  
22nF  
4.7µF  
0.33µF  
0
400  
OUTPUT CURRENT (mA)  
500  
600  
100  
200  
300  
3957A TA01b  
3957A TA01a  
3957af  
1
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