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LTC3646

更新时间： 2023-12-20 18:46:21
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
28页 581K
描述
40V、1A、同步降压型稳压器

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中文翻译

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LTC3646 数据手册

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LTC3646/LTC3646-1  
40V, 1A Synchronous  
Step-Down Converter  
FEATURES  
DESCRIPTION  
The LTC®3646 is a high efficiency, step-down DC/DC  
converter with internal high side and synchronous power  
FETs. It draws only 140µA typical DC supply current in  
Burst Mode operation at no load while maintaining output  
voltage regulation.  
n
Wide Input Voltage Range: 4.0V to 40V  
n
1A Guaranteed Output Current  
n
High Efficiency: Up to 95%  
n
Wide Output Voltage Range  
n
LTC3646: 2.0V to 30V  
LTC3646-1: 0.6V to 15V  
n
The LTC3646 can supply up to a 1A load, and its combina-  
tion of Burst Mode operation, integrated power switches  
and low quiescent current provides high efficiency over a  
broad range of load currents. Alternatively, it can be used  
inforcedcontinuousmodeforripplesensitiveapplications.  
n
1% Accurate Reference Voltage  
Internal or External Compensation  
n
n
Switching Frequency Adjustable and Synchronizable:  
200kHz to 3MHz  
Selectable High Efficiency Burst Mode® Operation or  
n
The LTC3646 has a wide 4.0V to 40V input range and its  
patented controlled on-time architecture and 0.6V refer-  
ence voltage allow for large step-down ratios without  
the risk of output overvoltage. The frequency may be set  
between 200kHz and 3.0MHz with a program resistor or  
synchronized to an external clock.  
Forced Continuous Mode  
14 Lead 3mm × 4mm DFN or Thermally Enhanced  
16-Lead MSOP Packages  
n
APPLICATIONS  
n
Point of Load Power Supplies  
The internal soft-start, short-circuit protection and volt-  
age rating make the LTC3646 a robust part ideal for high  
voltage applications.  
n
Intermediate Bus Power  
n
Automotive Applications  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode 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 6580258, 5481178,  
5994885, 6304066, 5847554, 6476589, 6774611.  
TYPICAL APPLICATION  
Efficiency Curve  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1.0  
0.8  
0.6  
0.4  
0.2  
0
V
IN  
BOOST  
SW  
V
= 12V  
PVIN  
SVIN  
RUN  
INTV  
IN  
V
= 5V  
40V MAX  
OUT  
f = 1MHz  
0.1µF  
3.3µH  
LTC3646  
V
OUT  
= 3.3V  
V
5V  
1A  
OUT  
CC  
10µF  
MODE/SYNC  
ITH  
RT  
V
ON  
SWITCH  
CONTROL  
EXTV  
CC  
V
= 5V  
OUT  
412k  
4.7µF  
V
= 3.3V  
OUT  
+
–
15µF  
V
FB  
0.6V  
SGND  
PGND  
0.001  
0.01  
0.1  
1
56.2k  
LOAD CURRENT (A)  
3646 TA01b  
3646 TA01a  
36461fc  
1
For more information www.linear.com/LTC3646  
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