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LTC3638_15

更新时间： 2024-11-24 01:22:39
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
26页 614K
描述
High Efficiency, 140V 250mA Step-Down Regulator

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中文翻译

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LTC3638_15 数据手册

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LTC3638  
High Efficiency, 140V  
250mA Step-Down  
Regulator  
FEATURES  
DESCRIPTION  
The LTC®3638 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 20mA to 250mA Maximum Output  
Current  
The LTC3638 can supply up to 250mA 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 LTC3638’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 LTC3638 is a robust regulator  
suitedforregulatingfromawidevarietyofpowersources.  
Additionally,theLTC3638includesapreciserunthreshold  
and soft-start feature to guarantee that the power system  
start-up is well-controlled in any environment. A feedback  
comparator output enables multiple LTC3638s 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 LTC3638 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, 250mA Step-Down Regulator  
80  
L1  
220µH  
70  
60  
50  
40  
30  
20  
10  
0
V
V
V
= 12V  
= 48V  
= 140V  
IN  
IN  
IN  
V
V
IN  
OUT  
V
SW  
IN  
5V TO 140V  
5V  
1000  
100  
10  
LTC3638  
250mA  
V
FB  
RUN  
C
IN  
1µF  
OVLO  
V
250V  
SS  
V
PRG1  
C
OUT  
PRG2  
22µF  
GND  
POWER LOSS  
100  
3638 TA01a  
1
0.1  
1
10  
1000  
LOAD CURRENT (mA)  
3638 TA01b  
3638fa  
1
For more information www.linear.com/LTC3638  
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