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LT3990-3.3_15

更新时间： 2024-01-09 22:34:46
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
22页 305K
描述
62V, 350mA Step-Down Regulator with 2.5A Quiescent Current and Integrated Diodes

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LT3990-3.3_15 数据手册

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LT3990/LT3990-3.3/LT3990-5  
62V, 350mA Step-Down  
Regulator with 2.5µA  
Quiescent Current and  
Integrated Diodes  
FEATURES  
DESCRIPTION  
Low Ripple Burst Mode® Operation  
The LT®3990 is an adjustable frequency monolithic buck  
switching regulator that accepts a wide input voltage  
range up to 62V, 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 neces-  
saryoscillator, controlandlogiccircuitry. LowrippleBurst  
Mode operation maintains high efficiency at low output  
currents while keeping the output ripple below 5mV in a  
typical application. Current mode topology is used for fast  
transient response and good loop stability. A catch diode  
current limit provides protection against shorted outputs  
and overvoltage conditions. An accurate programmable  
undervoltage lockout feature is available, producing a low  
shutdowncurrentof0.7µA.Apowergoodflagsignalswhen  
n
2.5µA I at 12V to 3.3V  
Q
IN  
OUT  
Output Ripple < 5mV  
P-P  
n
n
n
n
n
Wide Input Voltage Range: 4.2V to 62V Operating  
Adjustable Switching Frequency: 200kHz to 2.2MHz  
Integrated Boost and Catch Diodes  
350mA Output Current  
Fixed Output Voltages: 3.3V, 5V  
2µA I at 12V  
Q
IN  
n
n
Accurate Programmable Undervoltage Lockout  
FMEA Fault Tolerant (MSOP Package)  
OutputStaysatorBelowRegulationVoltageDuring  
Adjacent Pin Short or When a Pin is Left Floating  
n
n
n
n
Low Shutdown Current: I = 0.7µA  
Q
Internal Sense Limits Catch Diode Current  
Power Good Flag  
Small, Thermally Enhanced 16-Pin MSOP  
and (3mm × 3mm) DFN Packages  
V
reaches90%oftheprogrammedoutputvoltage.The  
OUT  
LT3990 is available in small, thermally enhanced 16-pin  
MSOP and 3mm × 3mm DFN packages.  
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.  
APPLICATIONS  
n
Automotive Battery Regulation  
n
Power for Portable Products  
n
Industrial Supplies  
TYPICAL APPLICATION  
Power Loss  
1000  
V
= 12V  
IN  
5V Step-Down Converter  
100  
10  
V
IN  
6.5V TO 62V  
0.22µF  
33µH  
V
BOOST  
LT3990-5  
EN/UVLO SW  
IN  
V
OUT  
5V  
OFF ON  
1
350mA  
PG  
BD  
0.1  
RT  
V
OUT  
22µF  
2.2µF  
GND  
374k  
f = 400kHz  
0.01  
3990 TA01a  
0.001 0.01  
0.1  
1
10  
100  
LOAD CURRENT (mA)  
3990 TA01b  
3990fa  
1
1234567...22

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