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LT3742EUF-TRPBF PDF预览

LT3742EUF-TRPBF

更新时间： 2024-11-06 05:43:35
品牌 Logo 应用领域
凌特 - Linear 开关控制器
页数 文件大小 规格书
24页 275K
描述
Dual, 2-Phase Step-Down Switching Controller

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中文翻译

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LT3742EUF-TRPBF 数据手册

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LT3742  
Dual, 2-Phase Step-Down  
Switching Controller  
FEATURES  
DESCRIPTION  
TheLT®3742isadualstep-downDC/DCswitchingregulator  
controllerthatdriveshighsideN-channelpowerMOSFETs.  
A 500kHz fixed frequency current mode architecture pro-  
vides fast transient response with simple loop compensa-  
tion components and cycle-by-cycle current limiting. The  
output stages of the two controllers operate 180° out of  
phase to reduce the input ripple current, minimizing the  
noise induced on the input supply, and allowing less input  
capacitance.  
■
Wide Input Voltage Range: 4V to 30V  
■
Wide Output Voltage Range: 0.8V to V  
IN  
■
Low Shutdown I : 20μA  
Q
■
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
0.8V 1.5% Voltage Reference  
■
■
■
500kHz Current Mode Fixed Frequency Operation  
Internal Boost Converter Provides Bias Rail for  
N-Channel MOSFET Gate Drive  
Power Good Voltage Monitor for Each Output  
Programmable Soft-Start  
24-Lead 4mm × 4mm × 0.75mm Package  
■
■
■
AninternalboostregulatorgeneratesabiasrailofV +7V  
IN  
to provide gate drive for the N-channel MOSFETs allowing  
low dropout and 100% duty cycle operation. The LT3742  
can be used for applications where both controllers need  
to operate independently, or where both controllers are  
used to provide a single higher current output.  
APPLICATIONS  
■
Satellite and Cable TV Set-Top Boxes  
■
Distributed Power Regulation  
The device is available in a thermally enhanced 4mm ×  
4mm QFN package.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
Automotive Systems  
Super Capacitor Charger  
■
TYPICAL APPLICATION  
8V and 5V Dual Step-Down Converter  
10μH  
V
IN  
14V  
4.7μF  
45.3k  
20.0k  
Efficiency vs Load Current  
V
SWB BIAS  
IN  
UVLO  
1μF  
100  
8V  
OUT  
90  
80  
70  
60  
50  
40  
LT3742  
5V  
OUT  
V
V
IN  
IN  
10μF  
10μF  
G1  
G2  
6.5μH  
6.5μH  
0.010Ω  
0.010Ω  
V
V
5V  
4A  
OUT1  
8V  
OUT2  
SW1  
SW2  
+
–
+
4A  
SENSE1  
SENSE1  
FB1  
SENSE2  
SENSE2  
1.8k  
1.05k  
–
FB2  
47μF  
47μF  
200Ω  
200Ω  
PG1  
PG1  
PG2  
PG2  
2.5  
LOAD CURRENT (A)  
3
0
0.5  
1
1.5  
2
3.5  
4
RUN/SS1  
RUN/SS2  
V
V
C1  
C2  
30k  
20k  
RUN1  
3742 TA03b  
RUN2  
GND  
1nF  
1000pF  
1nF 1000pF  
3742 TA03a  
3742f  
1
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中文翻译

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