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LT3973

更新时间： 2023-12-20 18:44:31
品牌 Logo 应用领域
亚德诺 - ADI 二极管稳压器
页数 文件大小 规格书
24页 467K
描述
具 2.5μA 静态电流和集成型二极管的 42V、750mA 降压型稳压器

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中文翻译

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LT3973 数据手册

 浏览型号LT3973的Datasheet PDF文件第2页浏览型号LT3973的Datasheet PDF文件第3页浏览型号LT3973的Datasheet PDF文件第4页浏览型号LT3973的Datasheet PDF文件第5页浏览型号LT3973的Datasheet PDF文件第6页浏览型号LT3973的Datasheet PDF文件第7页 
LT3973/LT3973-3.3/LT3973-5  
42V, 750mA Step-Down  
Regulator with 2.5µA  
Quiescent Current and  
Integrated Diodes  
FEATURES  
DESCRIPTION  
n
Ultralow Quiescent Current  
The LT®3973 is an adjustable frequency monolithic buck  
switchingregulatorthatacceptsawideinputvoltagerange  
up to 42V, and consumes only 2.5µA of quiescent current.  
A high efficiency switch is included on the die along with  
the catch diode, boost diode, and the necessary oscillator,  
controlandlogiccircuitry.LowrippleBurstModeoperation  
maintainshighefficiencyatlowoutputcurrentswhilekeep-  
ing the output ripple below 10mV in a typical application.  
Aminimumdropoutvoltageof530mVismaintainedwhen  
theinputvoltagedropsbelowtheprogrammedoutputvolt-  
age, such as during automotive cold crank. Current mode  
topologyisusedforfasttransientresponseandgoodloop  
stability. A catch diode current limit provides protection  
against shorted outputs and overvoltage conditions, with  
thermalshutdownprovidingadditionalfaultprotection.An  
accurate programmable undervoltage lockout feature is  
available, producing a low shutdown current of 0.75µA.  
n
2.5µA I at 12V to 3.3V  
Q
IN  
OUT  
Low Ripple Burst Mode® Operation  
n
n
Output Ripple < 10mV  
P-P  
n
n
n
n
n
n
Wide Input Voltage Range: 4.2V to 42V Operating  
Adjustable Switching Frequency: 200kHz to 2.2MHz  
Integrated Boost and Catch Diodes  
750mA Output Current  
Excellent Start-Up and Dropout Performance  
Fixed Output Voltages: 3.3V, 5V  
n
1.9µA I at 12V  
Q
IN  
n
n
n
n
n
n
Accurate Programmable Undervoltage Lockout  
Low Shutdown Current: I = 0.75µA  
Internal Catch Diode Current Limit  
Power Good Flag  
Thermal Shutdown  
Small, Thermally Enhanced 10-Lead MSOP and  
(3mm × 3mm) DFN Packages  
Q
A power good flag signals when V  
reaches 90% of  
OUT  
the programmed output voltage. The LT3973 is available  
in small, thermally enhanced 10-lead MSOP and 3mm ×  
3mm DFN packages.  
APPLICATIONS  
n
Automotive Battery Regulation  
Power for Portable Products  
Industrial Supplies  
Gate Drive Bias  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
n
n
n
Efficiency  
TYPICAL APPLICATION  
90  
80  
70  
60  
50  
40  
1000  
100  
10  
V
= 12V  
IN  
5V Step-Down Converter  
V
IN  
5.6V TO 42V  
C3  
0.47µF  
V
BOOST  
LT3973  
EN/UVLO SW  
IN  
L1  
15µH  
V
OUT  
5V  
OFF ON  
1
750mA  
PG  
BD  
OUT  
FB  
15pF  
1M  
C1  
C2  
22µF  
RT  
0.1  
0.01  
4.7µF  
GND  
215k  
f = 600kHz  
316k  
3973 TA01a  
0.01  
0.1  
1
10  
100  
LOAD CURRENT (mA)  
3973 TA01b  
3973fb  
1
For more information www.linear.com/LT3973  
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