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LTC3621IMS8E#PBF

更新时间： 2024-11-21 21:01:47
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凌特 - Linear /
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LTC3621IMS8E#PBF 数据手册

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LTC3621/LTC3621-2  
17V, 1A Synchronous  
Step-Down Regulator with  
3.5µA Quiescent Current  
FeaTures  
DescripTion  
n
Wide V Range: 2.7V to 17V  
The LTC®3621/LTC3621-2 is a high efficiency 17V, 1A  
synchronousmonolithicstep-downregulator.Theswitch-  
ing frequency is fixed to 1MHz or 2.25MHz with a ±±40  
synchronizingrange.Theregulatorfeaturesultralowquies-  
IN  
OUT  
n
Wide V  
Range: 0.6V to V  
IN  
n
n
n
n
n
n
n
95% Max Efficiency  
Low I < 3.5µA, Zero-Current Shutdown  
Q
cent current and high efficiencies over a wide V  
range.  
Constant Frequency (1MHz/2.25MHz)  
OUT  
Full Dropout Operation with Low I  
1A Rated Output Current  
Q
The step-down regulator operates from an input voltage  
range of 2.7V to 17V and provides an adjustable output  
±10 Output Voltage Accuracy  
range from 4.6V to V while delivering up to 1A of output  
IN  
Current Mode Operation for Excellent Line and Load  
Transient Response  
current. A user-selectable mode input is provided to allow  
the user to trade off ripple noise for light load efficiency;  
Burst Mode operation provides the highest efficiency at  
lightloads,whilepulse-skippingmodeprovidesthelowest  
voltage ripple. The MODE pin can also be used to allow the  
user to sync the switching frequency to an external clock.  
n
n
Synchronizable to External Clock  
Pulse-Skipping, Forced Continuous, Burst Mode®  
Operation  
n
n
n
Internal Compensation and Soft-Start  
Overtemperature Protection  
Compact 6-Lead DFN (2mm × 3mm) Package or  
Thermally-Enhanced MS8E Package with Power  
Good Output and Independent SGND Pin  
LTC3621 Options  
PART NAME  
LTC3621  
FREQUENCY  
1.44MHz  
1.44MHz  
1.44MHz  
2.25MHz  
2.25MHz  
2.25MHz  
V
OUT  
Adjustable  
3.3V  
LTC3621-3.3  
LTC3621-5  
LTC3621-2  
LTC3621-23.3  
LTC3621-25  
5V  
applicaTions  
Adjustable  
3.3V  
n
Portable-Handheld Scanners  
n
Industrial and Embedded Computing  
5V  
n
Automotive Applications  
Emergency Radio  
L, LT, LTC, LTM, Burst Mode, Linear Technology, the Linear logo and LTSpice are registered  
trademarks and Hot Swap and LTpowerCAD are trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 5±81178, 6584258, 6±98±66, 6611131, 6177787, 5745919, 58±755±.  
n
Typical applicaTion  
Efficiency and Power Loss vs Load at 1MHz  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
2.5V VOUT with 400mA Burst Clamp, fSW = 1MHz  
V
= 12V  
IN  
4.7µH  
V
2.5V  
1A  
EFFICIENCY  
OUT  
V
IN  
2.7V TO 17V  
V
SW  
IN  
10µF  
604k  
191k  
22pF  
LTC3621  
RUN  
FB  
22µF  
MODE/SYNC  
3621 TA01a  
INTV  
POWER LOSS  
CC  
GND  
1µF  
V
V
V
= 5V  
= 3.3V  
= 2.5V  
OUT  
OUT  
OUT  
0
0.2  
0.4  
0.6  
0.8  
1
LOAD CURRENT (A)  
3621 TA01b  
3621fc  
1
For more information www.linear.com/LTC3621  
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