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LT3958IUHETRPBF PDF预览

LT3958IUHETRPBF

更新时间： 2024-11-26 05:43:35
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
28页 320K
描述
High Input Voltage, Boost, Flyback, SEPIC and Inverting Converter

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中文翻译

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LT3958IUHETRPBF 数据手册

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LT3958  
High Input Voltage,  
Boost, Flyback, SEPIC and  
Inverting Converter  
FEATURES  
DESCRIPTION  
The LT®3958 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  
84V at 3.3A and driven from an internal regulated 7.2V  
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: 5V to 80V  
n
Single Feedback Pin for Positive or Negative  
Output Voltage  
n
Internal 3.3A/84V Power Switch  
n
Current Mode Control Provides Excellent Transient  
Response  
n
Programmable Operating Frequency (100kHz to  
1MHz) with One External Resistor  
n
Synchronizeable to an External Clock  
n
Low Shutdown Current < 1μA  
The operating frequency of LT3958 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 5V, and a low  
shutdown quiescent current of less than 1μA, make the  
LT3958 ideally suited for battery-powered systems.  
n
Internal 7.2V Low Dropout Voltage Regulator  
n
Programmable Input Undervoltage Lockout with  
Hysteresis  
Programmable Soft-Start  
n
n
Thermally Enhanced QFN (5mm × 6mm) Package  
The LT3958 features soft-start and frequency foldback  
functions to limit inductor current during start-up.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
APPLICATIONS  
n
Automotive  
No R  
and ThinSOT are trademarks of Linear Technology Corporation.  
SENSE  
n
Telecom  
All other trademarks are the property of their respective owners. Patents pending.  
n
Industrial  
TYPICAL APPLICATION  
High Efficiency Boost Converter  
Efficiency vs Output Current  
33μH  
V
OUT  
100  
95  
90  
85  
80  
75  
70  
V
IN  
V
= 24V  
48V  
IN  
12V TO 40V  
0.5A  
4.7μF  
s2  
4.7μF  
V
SW  
392k  
IN  
EN/UVLO  
GND  
53.6k  
LT3958  
SGND  
SYNC  
SENSE1  
464k  
SENSE2  
FBX  
INTV  
CC  
RT SS  
VC  
10k  
10nF  
15.8k  
41.2k  
300kHz  
0.33μF  
4.7μF  
0
400  
500  
100  
200  
300  
OUTPUT CURRENT (mA)  
3958 TA01b  
3958 TA01a  
3958f  
1
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