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LTC3621

更新时间： 2024-11-21 12:25:43
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 240K
描述
17V, 1A Synchronous Step-Down Regulator with 3.5μA Quiescent Current

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LTC3621 数据手册

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LTC3621/LTC3621-2  
17V, 1A Synchronous  
Step-Down Regulator with  
3.5µA Quiescent Current  
FeaTures  
DescripTion  
The LTC®3621/LTC3621-2 is a high efficiency 17V, 1A  
synchronousmonolithicstep-downregulator.Theswitch-  
ing frequency is fixed to 1MHz or 2.25MHz. The regulator  
features ultralow quiescent current and high efficiencies  
n
Wide V Range: 2.7V to 17V  
IN  
n
Wide V  
Range: 0.6V to V  
OUT  
IN  
n
n
n
n
n
n
n
95% Max Efficiency  
Low I < 3.5µA, Zero-Current Shutdown  
Q
Constant Frequency (1MHz/2.25MHz)  
over a wide V  
range.  
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  
1ꢀ Output Voltage Accuracy  
range from 0.6V 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  
light loads, while pulse-skipping mode provides the low-  
est voltage ripple.  
Pulse-Skipping, Forced Continuous, Burst Mode®  
Operation  
n
n
n
n
Internal Compensation and Soft-Start  
Overtemperature Protection  
Compact 6-Lead DFN (2mm × 3mm) Package or  
8-Lead MSOPE Package with Power Good Output  
and Independent SGND Pin  
List of LTC3621 Options  
PART NAME  
LTC3621  
FREQUENCY  
1.00MHz  
V
OUT  
Adjustable  
Adjustable  
LTC3621-2  
2.25MHz  
applicaTions  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents, including 5481178, 6580258,  
6498466, 6611131, 6177787, 5705919, 5847554.  
n
Portable-Handheld Scanners  
Automotive Applications  
n
n
Emergency Radio  
Typical applicaTion  
Efficiency and Power Loss vs Load  
2.5V VOUT with 400mA Burst Clamp, fSW = 1MHz  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1.0  
4.7µH  
V
2.5V  
1A  
EFFICIENCY  
OUT  
V
IN  
V
SW  
IN  
2.7V TO 17V  
0.1  
10µF  
604k  
191k  
22pF  
LTC3621  
RUN  
FB  
22µF  
MODE  
3621 TA01a  
0.01  
0.001  
0.0001  
INTV  
CC  
GND  
1µF  
POWER LOSS  
0.01  
V
= 12V  
IN  
0.0001  
0.001  
0.1  
1
LOAD CURRENT (A)  
3621 TA01b  
3621f  
1
For more information www.linear.com/LTC3621  
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