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LTC7138

更新时间： 2024-09-24 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
24页 472K
描述
高效率、140V、400mA 降压型稳压器

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中文翻译

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LTC7138 数据手册

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LTC7138  
High Efficiency, 140V  
400mA Step-Down  
Regulator  
FeaTures  
DescripTion  
The LTC®7138 is a high efficiency step-down DC/DC  
regulator with internal power switch that draws only 12μA  
typical DC supply current while maintaining a regulated  
output voltage at no load.  
n
Wide Operating Input Voltage Range: 4V to 140V  
n
Internal Low Resistance Power MOSFET  
n
No Compensation Required  
n
Adjustable 100mA to 400mA Maximum Output  
Current  
The LTC7138 can supply up to 400mA load current and  
features a programmable peak current limit that provides  
a simple method for optimizing efficiency and for reduc-  
ing output ripple and component size. The LTC7138’s  
combination of Burst Mode® operation, integrated power  
switch, low quiescent current, and programmable peak  
current limit provides high efficiency over a broad range  
of load currents.  
n
Low Dropout Operation: 100% Duty Cycle  
n
Low Quiescent Current: 12µA  
Wide Output Range: 0.8V to V  
n
IN  
n
n
n
n
n
n
n
0.8V 1% Feedback Voltage Reference  
Precise RUN Pin Threshold  
Internal or External Soft-Start  
Programmable 1.8V, 3.3V, 5V or Adjustable Output  
Few External Components Required  
Programmable Input Overvoltage Lockout  
Thermally Enhanced High Voltage MSOP Package  
Withitswideinputrangeof4Vto140Vandprogrammable  
overvoltage lockout, the LTC7138 is a robust regulator  
suitedforregulatingfromawidevarietyofpowersources.  
Additionally, theLTC7138 includesaprecise runthreshold  
and soft-start feature to guarantee that the power system  
start-up is well-controlled in any environment. A feedback  
comparator output enables multiple LTC7138s to be con-  
nected in parallel for higher current applications.  
applicaTions  
n
Industrial Control Supplies  
n
Medical Devices  
n
Distributed Power Systems  
n
Portable Instruments  
The LTC7138 is available in a thermally enhanced high  
voltage-capable16-leadMSEpackagewithfourmissingpins.  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
n
Battery-Operated Devices  
n
Avionics  
Automotive  
n
Typical applicaTion  
Efficiency and Power Loss vs Load Current  
100  
EFFICIENCY  
90  
5V to 140V Input to 5V Output, 400mA Step-Down Regulator  
80  
70  
L1  
220µH  
V
V
IN  
OUT  
V
SW  
IN  
5V TO 140V  
5V  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
C
IN  
LTC7138  
ANODE  
400mA  
C
OUT  
22µF  
1µF  
RUN  
SS  
V
V
250V  
POWER LOSS  
V
FB  
OVLO  
PRG1  
PRG2  
GND  
V
V
V
= 12V  
= 48V  
= 140V  
IN  
IN  
IN  
7138 TA01a  
1
1000  
0.1  
1
10  
100  
LOAD CURRENT (mA)  
7138 TA01b  
7138f  
1
For more information www.linear.com/LTC7138  
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