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LTC3851EUD-TRPBF

更新时间： 2024-11-07 05:43:55
品牌 Logo 应用领域
凌特 - Linear 开关控制器
页数 文件大小 规格书
28页 321K
描述
Synchronous Step-Down Switching Regulator Controller

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中文翻译

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LTC3851EUD-TRPBF 数据手册

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LTC3851  
Synchronous  
Step-Down Switching  
Regulator Controller  
FEATURES  
DESCRIPTION  
The LTC®3851 is a high performance synchronous  
step-down switching regulator controller that drives  
an all N-channel synchronous power MOSFET stage. A  
constant frequency current mode architecture allows a  
phase-lockable frequency of up to 750kHz.  
n
Wide V Range: 4V to 38V Operation  
SENSE  
±±1 Output Voltage Accuracy  
IN  
n
R
or DCR Current Sensing  
n
n
n
n
n
n
n
n
n
n
Phase-Lockable Fixed Frequency: 250kHz to 750kHz  
Dual N-Channel MOSFET Synchronous Drive  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Output Current Foldback Limiting  
OPTI-LOOP compensation allows the transient response  
to be optimized over a wide range of output capacitance  
and ESR values. The LTC3851 features a precision 0.8V  
reference that is compatible with a wide 4V to 38V input  
supply range.  
Output Overvoltage Protection  
5V Internal Regulator  
OPTI-LOOP® Compensation Minimizes C  
OUT  
The TK/SS pin ramps the output voltage during start-up.  
Current foldback limits MOSFET heat dissipation during  
short-circuit conditions. The MODE/PLLIN pin selects  
among Burst Mode operation, pulse skipping mode or  
continuousinductorcurrentmodeatlightloadsandallows  
the IC to be synchronized to an external clock.  
Selectable Continuous, Pulse-Skipping or  
Burst Mode® Operation at Light Loads  
n
n
n
Low Shutdown I : 20μA  
Q
V
Range: 0.8V to 5.5V  
OUT  
16-Lead Narrow SSOP or 3mm × 3mm QFN Package  
APPLICATIONS  
, LT, LTC, LTM, Burst Mode 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 5408150, 5481178, 5705919, 5929620, 6304066,  
6498466, 6580258, 6611131.  
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  
V
IN  
I
V
LIM  
IN  
100  
95  
10000  
1000  
100  
4V TO 38V  
150μF  
V
V
= 12V  
IN  
OUT  
FREQ/PLLFLTR TG  
= 3.3V  
0.68μH  
10k  
V
3.3V  
10A  
OUT  
RUN  
SW  
90  
EFFICIENCY  
LTC3851  
0.22μF  
85  
TK/SS  
BOOST  
330μF  
0.1μF  
80  
75  
INTV  
CC  
10nF  
1k  
POWER LOSS  
70  
65  
60  
55  
50  
BG  
I
TH  
GND  
100pF  
+
SENSE  
PLLIN/MODE  
SENSE  
0.22μF  
13k  
–
62.5k  
20k  
10  
10000  
10  
100  
1000  
V
FB  
LOAD CURRENT (mA)  
3851TA01b  
3851 TA01a  
3851f  
1
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