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LTC3414

更新时间： 2024-09-23 11:45:59
品牌 Logo 应用领域
Linear Systems 稳压器
页数 文件大小 规格书
36页 435K
描述
24V, 15A Monolithic Step Down Regulator with Differential Output Sensing

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LTC3414 数据手册

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LTC3613  
24V, 15A Monolithic  
Step Down Regulator with  
Differential Output Sensing  
DESCRIPTION  
The LTC®3613 is a monolithic synchronous step-down  
switching regulator capable of regulating outputs from 0.6V  
to5.5Vwithupto15Aoutputcurrent.Thecontrolledon-time  
constantfrequencyvalleycurrentmodearchitectureallowsfor  
bothfasttransientresponseandconstantfrequencyswitch-  
FEATURES  
n
Wide V Range: 4.5V to 24V;  
IN  
V
OUT  
Range: 0.6V to 5.5V at up to 15A  
0.67% Output Voltage Accuracy  
n
n
Controlled On-Time Valley Current Mode Architecture,  
Excellent Current Sharing Capability  
Frequency Programmable from 200kHz to 1MHz  
and Synchronizable to External Clock  
n
n
ing in steady-state operation, independent of V , V  
and  
IN OUT  
load. This also provides excellent current sharing capability.  
R
or Inductor DCR Current Sensing With  
SENSE  
Differential output voltage sensing along with a precision  
internal reference combine to offer 0.6ꢀ7 output regula-  
tion, even if the output ground reference deviates from  
local ground by 500mV. The switching frequency can be  
programmedfrom200kHzto1MHzwithanexternalresis-  
tor. The switching frequency is also phase synchronizable  
to an external clock in applications where switching noise/  
EMI reduction is crucial.  
Accurate Current Limit  
n
n
Fast Transient Response  
Differential Output Voltage Sensing Allowing 500mV  
Common Mode Remote Ground  
n
n
n
n
n
n
n
t
= 65ns; t  
= 105ns  
ON(MIN)  
OFF(MIN)  
Overvoltage Protection and Current Limit Foldback  
Power Good Output Voltage Monitor  
Voltage Tracking Start-Up  
Verylowt andt timesallowfornear07andnear1007  
External V Input for Bypassing Internal LDO  
Micropower Shutdown: I = 15μA  
ꢀmm × 9mm 56-pin QFN Package  
ON  
OFF  
CC  
duty cycles, respectively. Voltage tracking soft start-up is  
providedfortrackingandsequencingapplications.Safetyfea-  
turesincludeoutputovervoltageprotection, programmable  
current limit with foldback, and power good monitoring.  
L, LT, LTC, LTM, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks  
Q
APPLICATIONS  
n
Distributed Power System  
and Hot Swap and No R  
is a trademark of Linear Technology Corporation. All other  
SENSE  
n
trademarks are the property of their respective owners. Protected by U.S. Patents including  
54811ꢀ8, 548ꢀ554, 6580258, 6304066, 64ꢀ6589, 6ꢀꢀ4611.  
Point-of-Load Converters  
n
Servers  
TYPICAL APPLICATION  
Efficiency and Power Loss  
vs Load Current  
High Efficiency High Power Step-Down Converter  
INTV  
CC  
PV  
SV  
100  
90  
80  
ꢀ0  
60  
50  
40  
30  
20  
10  
0
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
IN  
IN  
V
IN  
4.5V TO 24V  
PULSE-SKIPPING MODE  
+
0.1μF  
82μF  
LTC3613  
PGOOD  
100k  
V
OUT  
–
10Ω  
10Ω  
0.4ꢀμH  
SENSE  
SENSE  
RUN  
1000pF  
0.1μF  
FORCED  
CONTINUOUS  
MODE  
+
V
RNG  
V
1.5V  
15A  
1.5mΩ  
OUT  
MODE/PLLIN  
SW  
0.1μF  
EXTV  
CC  
15k  
TRACK/SS  
BOOST  
4ꢀpF  
V
= 12V  
OUT  
IN  
10k  
V
= 1.5V  
INTV  
CC  
+
2ꢀ0pF  
4.ꢀμF  
330μF  
×2  
0.01  
0.1  
1
10  
21k  
PGND  
ITH  
LOAD CURRENT (A)  
115k  
3613 TA01a  
+
OSNS  
–
RT  
SGND  
V
V
OSNS  
3613 TA01  
3613fa  
1
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