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LTC3854EMSE

更新时间： 2024-11-09 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
28页 382K
描述
Small Footprint, Wide VIN Range Synchronous Step-Down DC/DC Controller

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中文翻译

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LTC3854EMSE 数据手册

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LTC3854  
Small Footprint, Wide  
V Range Synchronous  
IN  
Step-Down DC/DC Controller  
FeaTures  
DescripTion  
n
Wide Operating V Range: 4.5V to 38V  
The LTC3854® is a high performance synchronous step-  
down switching DC/DC controller that drives an all N-  
channel synchronous power MOSFET stage.  
IN  
n
R
or DCR Current Sensing  
SENSE  
n
n
n
n
n
n
n
±±1 ꢀ.8V Reference ꢁccuracy Over ꢂemperature  
4ꢀꢀkHz Switching Frequency  
TheLTC3854featuresa400kHzconstantfrequencycurrent  
mode architecture. The LTC3854 operates from a 4.5V to  
38V (40V absolute maximum) input voltage range and  
regulates the output voltage from 0.8V to 5.5V.  
Dual N-channel MOSFET Synchronous Drive  
Very Low Dropout Operation: 97% Duty Cycle  
Starts Up Into Pre-Biased Output  
Adjustable Output Voltage Soft-Start  
Output Current Foldback Limiting  
(Disabled During Soft-Start)  
The RUN/SS pin provides both soft-start and enable  
features. OPTI-LOOP compensation allows the transient  
response to be optimized over a wide range of output ca-  
pacitanceandESRvalues.CurrentfoldbacklimitsMOSFET  
dissipationduringshortcircuitconditions.Currentfoldback  
functions are disabled during soft-start.  
n
n
n
n
n
Output Overvoltage Protection  
5V LDO for External Gate Drive  
OPTI-LOOP® Compensation Minimizes C  
OUT  
Low Shutdown I : 15µA  
Q
Tiny Thermally Enhanced 12-Pin 2mm × 3mm DFN  
The LTC3854 has a minimum on-time at 75ns, making it  
well suited for high step-down ratios. The strong onboard  
MOSFET drivers allow the use of high power external  
MOSFETs to produce output currents up to 20A.  
L, LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners. Protected by U.S. Patents, including 5705919, 6498466, 5408150, 6222231.  
and MSOP Packages  
applicaTions  
n
Automotive Systems  
n
Telecom Systems  
n
Industrial Equipment  
Distributed DC Power Systems  
n
Typical applicaTion  
High Efficiency Synchronous Step-Down Converter  
Efficiency and Power Loss  
vs Load Current  
97  
96  
95  
94  
93  
92  
2.0  
1.6  
1.2  
0.8  
0.4  
0
V
IN  
V
IN  
6V TO 38V  
47µF  
50V  
TG  
EFFICIENCY  
LTC3854  
RUN/SS BOOST  
0.1µF  
0.1µF  
4.7µF  
4.7µH  
AT 8.2mΩ DCR  
ITH  
SW  
V
5V  
7A  
OUT  
2200pF  
10k  
100pF  
+
0.22µF  
INTV  
CC  
POWER LOSS  
5.49k  
150µF  
8.06k  
42.2k  
FB  
BG  
4.99k  
V
= 12V  
IN  
6
–
+
SENSE  
SENSE  
1
2
3
4
5
7
GND  
LOAD CURRENT (A)  
3854 TA01b  
3854 TA01  
3854fa  
ꢀ
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