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LTC3786IUD-PBF

更新时间： 2024-09-15 12:19:15
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
34页 407K
描述
Low IQ Synchronous Boost Controller

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LTC3786IUD-PBF 数据手册

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LTC3786  
Low I Synchronous  
Q
Boost Controller  
FeaTures  
DescripTion  
n
Synchronous Operation For Highest Efficiency and  
The LTC®3786 is a high performance synchronous boost  
converter controller that drives all N-channel power  
MOSFETs. Synchronous rectification increases efficiency,  
reduces power losses and eases thermal requirements,  
allowing the LTC3786 to be used in high power boost  
applications.  
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 Voltages Up to 60V  
n
n
n
n
n
n
n
n
n
n
n
n
1ꢀ 1.2V 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 LTC3786 can operate from  
an input supply as low as 2.5V after start-up. The 55µA  
no-load quiescent current extends operating run time in  
battery-powered systems.  
100ꢀ DutyCycle Capability forSynchronous MOSFET  
Low Quiescent Current: 55µA  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Adjustable Output Voltage Soft-Start  
Power Good Output Voltage Monitor  
Low Shutdown Current I : <8µA  
Internal 5.4V LDO for Gate Drive Supply  
Thermally Enhanced 16-Pin 3mm × 3mm QFN and  
MSOP Packages  
Q
The operating frequency can be set for a 50kHz to 900kHz  
range or synchronized to an external clock using the  
internal PLL. The LTC3786 also features a precision 1.2V  
reference and a power good output indicator. The SS pin  
rampstheoutputvoltageduringstart-up.ThePLLIN/MODE  
pin selects among Burst Mode® operation, pulse-skipping  
mode or continuous inductor current mode at light loads.  
applicaTions  
n
Industrial and Automotive Power Supplies  
n
Automotive Start-Stop Systems  
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are  
n
Medical Devices  
High Voltage Battery-Powered Systems  
registered trademarks 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  
5408150, 5481178, 5705919, 5929620, 6177787, 6498466, 6580258, 6611131.  
Typical applicaTion  
12V to 24V/5A Synchronous Boost Converter  
Efficiency and Power Loss  
vs Load Current  
V
4.5V TO 24V  
IN  
VBIAS  
SENSE  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10000  
1000  
100  
10  
+
LTC3786  
220µF  
4mΩ  
BURST  
–
EFFICIENCY  
SENSE  
BURST  
LOSS  
PGOOD  
PLLIN/MODE  
RUN  
3.3µH  
FREQ  
TG  
0.1µF  
V
24V  
5A  
OUT  
SS  
SW  
0.1µF  
15nF  
220µF  
8.66k  
12.1k  
BOOST  
BG  
ITH  
V
V
= 12V  
220pF  
IN  
OUT  
1
= 24V  
Burst Mode OPERATION  
FIGURE 8 CIRCUIT  
INTV  
CC  
VFB  
0.1  
4.7µF  
0.00001 0.0001 0.001 0.01  
0.1  
1
10  
GND  
232k  
OUTPUT CURRENT (A)  
3786 TA01a  
3786 TA01b  
3786fa  
1
1234567...34

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