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LTC3805EMSE-5-TRMPBF PDF预览

LTC3805EMSE-5-TRMPBF

更新时间： 2024-10-01 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
20页 206K
描述
Adjustable Frequency Current Mode Flyback/ Boost/SEPIC DC/DC Controller

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LTC3805EMSE-5-TRMPBF 数据手册

 浏览型号LTC3805EMSE-5-TRMPBF的Datasheet PDF文件第2页浏览型号LTC3805EMSE-5-TRMPBF的Datasheet PDF文件第3页浏览型号LTC3805EMSE-5-TRMPBF的Datasheet PDF文件第4页浏览型号LTC3805EMSE-5-TRMPBF的Datasheet PDF文件第5页浏览型号LTC3805EMSE-5-TRMPBF的Datasheet PDF文件第6页浏览型号LTC3805EMSE-5-TRMPBF的Datasheet PDF文件第7页 
LTC3805-5  
Adjustable Frequency  
Current Mode Flyback/  
Boost/SEPIC DC/DC Controller  
FEATURES  
DESCRIPTION  
The LTC®3805-5 is a current mode DC/DC controller de-  
signed to drive an N-channel MOSFET in flyback, boost  
and SEPIC converter applications. Operating frequency  
and slope compensation can be programmed by external  
resistors. Programmable overcurrent sensing protects  
the converter from overload and short-circuit conditions.  
Soft-start can be programmed using an external capacitor  
and the soft-start capacitor also programs an automatic  
restart feature.  
■
V and V  
Limited Only by External Components  
IN  
OUT  
■
■
■
4.5V Undervoltage Lockout Threshold  
Adjustable Slope Compensation  
Adjustable Overcurrent Protection with Automatic  
Restart  
■
Adjustable Operating Frequency (70kHz to 700kHz)  
with One External Resistor  
Synchronizable to an External Clock  
±±.5ꢀ ꢁeference Accuracy  
Only ±00mV Current Sense Voltage Drop  
ꢁUN Pin with Precision Threshold and Adjustable  
Hysteresis  
Programmable Soft-Start with One External Capacitor  
Low Quiescent Current: 360μA  
Small ±0-Lead MSOP and 3mm × 3mm DFN  
■
■
■
■
The LTC3805-5 provides ±±.5ꢀ output voltage accuracy  
and consumes only 360μA of quiescent current during  
normaloperationandonly40μAduringmicropowerstart-  
up. Using a 9.5V internal shunt regulator, the LTC3805-5  
■
■
■
can be powered from a high V through a resistor or it  
IN  
can be powered directly from a low impedance DC voltage  
from 4.7V to 8.8V.  
APPLICATIONS  
The LTC3805-5 is available in the ±0-lead MSOP package  
and the 3mm × 3mm DFN package.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
Automotive Power Supplies  
■
Telecom Power Supplies  
■
Isolated Electronic Equipment  
■
Auxiliary/Housekeeping Power Supplies  
■
Power over Ethernet  
TYPICAL APPLICATION  
Efficiency and Power Loss vs Load Current  
100  
95  
90  
85  
80  
75  
2.5  
2.0  
1.5  
1
5V to 12V/1A Boost Converter  
UPS840  
4.3μH  
V
12V  
1A  
5V EFFICIENCY  
8.5V EFFICIENCY  
OUT  
V
5V  
IN  
22μF  
×2  
100μF  
V
CC  
RUN  
GATE  
8.5V LOSS  
5V LOSS  
LTC3805-5  
1.33k  
3k  
I
OC  
TH  
191k  
SSFLT  
FS  
I
SENSE  
FB  
0.1μF  
20k  
470pF  
0.5  
0
SYNC GND  
118k  
8mΩ  
13.7k  
1
10  
0.01  
0.1  
38055 TA01  
LOAD CURRENT (A)  
38055TA01b  
38055fa  
1
1234567...20

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