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LTC3787

更新时间： 2024-09-16 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
36页 1005K
描述
具有直通功能的多相同步升压控制器

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中文翻译

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LTC3787 数据手册

 浏览型号LTC3787的Datasheet PDF文件第2页浏览型号LTC3787的Datasheet PDF文件第3页浏览型号LTC3787的Datasheet PDF文件第4页浏览型号LTC3787的Datasheet PDF文件第5页浏览型号LTC3787的Datasheet PDF文件第6页浏览型号LTC3787的Datasheet PDF文件第7页 
LTC3787  
PolyPhase Synchronous  
Boost Controller  
FEATURES  
DESCRIPTION  
n
2-Phase Operation Reduces Required Input and  
The LTC®3787 is a high performance PolyPhase® single  
outputsynchronousboostconvertercontrollerthatdrives  
two N-channel power MOSFET stages out-of-phase.  
Multiphase operation reduces input and output capacitor  
requirements and allows the use of smaller inductors than  
the single-phase equivalent. Synchronous rectification in-  
creasesefficiency,reducespowerlossesandeasesthermal  
requirements, enabling high power boost applications.  
Output Capacitance and Power Supply Induced Noise  
n
Synchronous Operation for Highest Efficiency and  
Reduced Heat Dissipation  
n
Wide V Range: 4.5V to 38V (40V Abs Max) and  
IN  
Operates Down to 2.5V After Start-Up  
Output Voltage Up to 60V  
n
n
n
n
n
n
n
n
n
n
n
±±1 ±.200V Reference Voltage  
R
or Inductor DCR Current Sensing  
SENSE  
A 4.5V to 38V input supply range encompasses a wide  
range of system architectures and battery chemistries.  
When biased from the output of the boost converter or  
another auxiliary supply, the LTC3787 can operate from  
an input supply as low as 2.5V after start-up. The operat-  
ing frequency can be set for a 50kHz to 900kHz range or  
synchronized to an external clock using the internal PLL.  
PolyPhase operation allows the LTC3787 to be configured  
for 2-, 3-, 4-, 6- and 12-phase operation.  
±001 Duty Cycle Capability for Synchronous MOSFET  
Low Quiescent Current: 135μA  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Power Good Output Voltage Monitor  
Low Shutdown Current, I < 8µA  
Q
Internal LDO Powers Gate Drive from VBIAS or EXTV  
CC  
Thermally Enhanced Low Profile 28-Pin 4mm × 5mm  
QFN Package and Narrow SSOP Package  
n
The SS pin ramps the output voltage during start-up. The  
PLLIN/MODE pin selects Burst Mode® operation, pulse-  
skipping mode or forced continuous mode at light loads.  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787,  
6580258.  
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
Industrial  
n
Automotive  
n
Medical  
Military  
n
TYPICAL APPLICATION  
Efficiency and Power Loss  
vs Output Current  
±2V to 24V/±0A 2-Phase Synchronous Boost Converter  
V
4.5V TO 24V START-UP VOLTAGE  
IN  
OPERATES THROUGH TRANSIENTS DOWN TO 2.5V  
V
100  
90  
10000  
1000  
100  
10  
IN  
80  
4.7µF  
TG2  
4.7µF  
47µF  
4mΩ  
4mΩ  
70  
TG1 VBIAS INTV  
BOOST1  
CC  
60  
50  
3.3µH  
3.3µH  
BOOST2  
SW2  
0.1µF  
0.1µF  
V
40  
30  
20  
10  
0
OUT  
24V AT 10A  
SW1  
LTC3787  
BG1  
SENSE1  
SENSE1  
VFB  
FREQ  
PLLIN/MODE  
BG2  
+
V
V
= 12V  
IN  
OUT  
1
–
= 24V  
+
232k  
SENSE2  
Burst Mode OPERATION  
FIGURE 10 CIRCUIT  
–
SENSE2  
0.1  
PGND  
0.00001 0.0001 0.001 0.01  
0.1  
1
10  
OUTPUT CURRENT (A)  
ITH SS SGND  
3787 TA01b  
15nF  
8.66k  
220µF  
12.1k  
BURST EFFICIENCY  
BURST LOSS  
100pF  
0.1µF  
3787 TA01a  
Rev. D  
1
Document Feedback  
For more information www.analog.com  
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