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LTC3769

更新时间： 2024-09-25 14:57:51
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
33页 1131K
描述
60V、低 IQ、同步升压型控制器

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中文翻译

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LTC3769 数据手册

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LTC3769  
60V Low I Synchronous  
Q
Boost Controller  
FEATURES  
DESCRIPTION  
n
Synchronous Operation for Highest Efficiency and  
The LTC®3769 is a high performance single output syn-  
chronous boost converter controller that drives an all  
N-channel power MOSFET stage. Synchronous rectifica-  
tion increases efficiency, reduces power losses and eases  
thermal requirements, simplifying high power boost ap-  
plications. The 28µA no-load quiescent current extends  
operating run time in battery-powered systems.  
Reduced Heat Dissipation  
n
Wide V Range: 4.5V to 60V (65V Abs Max);  
IN  
Operates Down to 2.3V After Start-Up  
n
n
n
n
n
n
n
n
n
n
n
Output Voltage Up to 60V  
±±1 ±.200V Reference Voltage  
R
or Inductor DCR Current Sensing  
SENSE  
±001 Duty Cycle Capability for Synchronous MOSFET  
A 4.5V to 60V input supply range encompasses a wide  
range of system architectures and battery chemistries.  
When biased from the output of the boost converter or  
anotherauxiliary supply, the LTC3769 can operate from an  
input supply as low as 2.3V after start-up. The operating  
frequency can be set within a 50kHz to 900kHz range or  
synchronized to an external clock using the internal PLL.  
Low Quiescent Current: 28μA  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Power Good Output Voltage Monitor  
Low Shutdown Current: 4µA  
Internal LDO Powers Gate Drive from VBIAS or EXTV  
CC  
Thermally Enhanced Low Profile 24-Pin 4mm × 4mm  
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.  
QFN Package and 20-Lead TSSOP Package  
n
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
Industrial  
n
Automotive  
n
Medical  
Military  
n
TYPICAL APPLICATION  
±20W, ±2V to 24V/5A Synchronous Boost Converter  
Efficiency and Power Loss  
vs Output Current  
3.3µH  
ꢌꢊꢊ  
ꢚꢊ  
ꢘꢊ  
ꢗꢊ  
ꢖꢊ  
ꢕꢊ  
ꢍꢊ  
ꢌꢊ  
ꢌ
4mΩ  
V
V
IN  
OUT  
24V/5A  
4.5V TO 60V  
22µF  
220µF  
DOWN TO 2.3V  
AFTER START-UP IF  
VBIAS IS POWERED  
VBIAS  
ꢅꢎꢎꢏꢄꢏꢅꢆꢄꢐ  
+
–
SENSE  
SENSE  
RUN  
SS  
10nF  
V
FOLLOWS V FOR V > 24V  
IN IN  
OUT  
FROM V  
OUT  
BG  
LTC3769  
8.66K  
100pF  
ꢃꢀꢒꢅR  
ꢓꢀꢔꢔ  
ꢊꢋꢌ  
15nF  
ITH  
TG  
ꢊꢋꢊꢌ  
SW  
PLLIN/MODE  
FREQ  
0.1µF  
BOOST  
ꢊꢋꢊꢊꢌ  
OVMODE  
ILIM  
ꢊꢋꢊꢊꢊꢌ ꢊꢋꢊꢊꢌ  
ꢊꢋꢊꢌ  
ꢊꢋꢌ  
ꢌ
ꢌꢊ  
ꢀꢁꢂꢃꢁꢂ ꢄꢁRRꢅꢆꢂ ꢇꢈꢉ  
INTV  
CC  
ꢙꢗꢖꢚ ꢂꢈꢊꢌꢛ  
4.7µF  
232k  
VFB  
PGOOD  
EXTV  
CC  
12.1k  
GND  
3769 TA01a  
Rev B  
1
For more information LTC3769  
1234567...33

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