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LTC3851IUD-1-PBF PDF预览

LTC3851IUD-1-PBF

更新时间： 2024-01-05 15:01:41
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 337K
描述
Synchronous Step-Down Switching Regulator Controller

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LTC3851IUD-1-PBF 数据手册

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LTC3851-1  
Synchronous  
Step-Down Switching  
Regulator Controller  
FEATURES  
DESCRIPTION  
The LTC®3851-1 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
Power Good Output Voltage Monitor  
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 LTC3851-1 features a precision 0.8V  
referenceandapowergoodindicator.Awide4Vto38V(40V  
absolutemaximum)inputsupplyrangeencompassesmost  
battery configurations and intermediate bus voltages.  
Output Overvoltage Protection  
OPTI-LOOP® Compensation Minimizes C  
OUT  
Selectable Continuous, Pulse-Skipping or  
Burst Mode® Operation at Light Loads  
The TK/SS pin ramps the output voltage during start-up  
and shutdown with coincident or ratiometric tracking.  
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.  
n
n
n
Low Shutdown I : 20μA  
Q
V
Range: 0.8V to 5.5V  
OUT  
Thermally Enhanced 16-Lead MSOP  
or 3mm × 3mm QFN Package  
APPLICATIONS  
n
Automotive Systems  
The LTC3851-1 is identical to the LTC3851 except that the  
n
Telecom Systems  
I
pin is replaced by PGOOD.  
LIM  
n
Industrial Equipment  
Distributed DC Power Systems  
L, 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
TYPICAL APPLICATION  
High Efficiency Synchronous Step-Down Converter  
Efficiency and Power Loss  
vs Load Current  
100k  
V
IN  
PGO0D  
FREQ/PLLFLTR TG  
INTV  
V
CC  
IN  
4.5V TO 38V  
100  
95  
10000  
1000  
100  
22μF  
V
V
= 12V  
IN  
OUT  
0.68μH  
3.01k  
V
3.3V  
15A  
330μF  
s2  
= 3.3V  
OUT  
0.1μF  
82.5k  
RUN  
LTC3851-1  
SW  
EFFICIENCY  
90  
0.1μF  
TK/SS  
BOOST  
85  
0.1μF  
80  
75  
POWER LOSS  
INTV  
CC  
2200pF  
4.7μF  
BG  
I
70  
65  
60  
55  
50  
TH  
GND  
15k  
330pF  
+
SENSE  
PLLIN/MODE  
SENSE  
0.047μF  
30.1k  
–
154k  
10  
V
FB  
10  
100  
1000  
10000  
100000  
LOAD CURRENT (mA)  
48.7k  
38511TA01b  
38511 TA01a  
38511f  
1
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