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LT3494_15

更新时间： 2024-09-13 01:16:35
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凌特 - Linear /
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12页 271K
描述
Micropower Low Noise Boost Converters with Output Disconnect

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LT3494_15 数据手册

 浏览型号LT3494_15的Datasheet PDF文件第2页浏览型号LT3494_15的Datasheet PDF文件第3页浏览型号LT3494_15的Datasheet PDF文件第4页浏览型号LT3494_15的Datasheet PDF文件第5页浏览型号LT3494_15的Datasheet PDF文件第6页浏览型号LT3494_15的Datasheet PDF文件第7页 
LT3494/LT3494A  
Micropower Low Noise  
Boost Converters with  
Output Disconnect  
FEATURES  
DESCRIPTION  
The LT®3494/LT3494A are low noise boost converters  
with integrated power switch, Schottky diode and output  
disconnect circuitry. The parts use a novel* control tech-  
nique resulting in low output voltage ripple as well as high  
efficiency over a wide load current range. This technique  
guarantees that the switching frequency stays above the  
audiobandfortheentireloadrange.Thepartsfeatureahigh  
performanceNPNpowerswitchwitha350mAand180mA  
currentlimitfortheLT3494AandLT3494respectively.The  
quiescent current is a low 65μA, which is further reduced  
to less than 1μA in shutdown. The internal disconnect  
circuitry allows the output voltage to be isolated from the  
inputduringshutdown.Anauxiliaryreferenceinput(CTRL  
pin) overrides the internal 1.225V feedback reference with  
any lower value allowing full control of the output voltage  
during operation. The LT3494/LT3494A are available in a  
tiny 8-lead 3mm × 2mm DFN package.  
■
Low Quiescent Current  
65μA in Active Mode  
1μA in Shutdown Mode  
■
Switching Frequency is Non-Audible Over Entire  
Load Range  
Integrated Power NPN:  
■
350mA Current Limit (LT3494A)  
180mA Current Limit (LT3494)  
■
Integrated Schottky Diode  
■
Integrated Output Disconnect  
■
Integrated Output Dimming  
■
Wide Input Range: 2.3V to 16V  
■
Wide Output Range: Up to 40V  
■
Tiny 8-Lead 3mm × 2mm DFN Package  
APPLICATIONS  
■
OLED Power  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
*Patent pending.  
■
Low Noise Power  
■
MP3 Players  
TYPICAL APPLICATION  
Output Voltage Ripple  
vs Load Current  
Efficiency and Power Loss  
vs Load Current  
OLED Power Supply from One Li-Ion Cell  
90  
80  
70  
60  
50  
40  
30  
20  
280  
240  
200  
160  
120  
80  
15  
V
= 3.6V  
LT3494  
FIGURE 5 CIRCUIT  
100MHz MEASUREMENT BW  
IN  
LOAD FROM  
CAPACITOR  
15μH  
V
IN  
3V  
LOAD FROM  
TO 4.2V  
4.7μF  
0.22μF  
V
OUT  
10  
5
SW  
CAP  
V
OUT  
16V  
V
V
OUT  
CC  
16mA  
LT3494  
2.21M  
2.2μF  
SHDN  
CTRL  
FB  
GND  
3494 TA01a  
40  
0
100  
0
0.1  
1
10  
0.1  
1
10  
100  
LOAD CURRENT (mA)  
LOAD CURRENT (mA)  
3494 TA01c  
3494 TA01b  
3494fb  
1
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