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LT3473EDD#PBF

更新时间： 2024-11-30 13:09:39
品牌 Logo 应用领域
凌特 - Linear 转换器升压转换器
页数 文件大小 规格书
12页 266K
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LT3473EDD#PBF 数据手册

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LT3473/LT3473A  
Micropower 1A Boost  
Converter with Schottky  
and Output Disconnect  
U
FEATURES  
DESCRIPTIO  
The LT®3473/LT3473A are micropower step-up DC/DC  
converters with integrated Schottky diode and output  
disconnect circuitry in low profile DFN packages. The  
small package size, high level of integration and the use of  
tiny SMT components yield a solution size of less than  
50mm2. Theinternal1Aswitchallowsthedevicetodeliver  
25Vatupto80mAfromaLi-Ioncell,whileautomaticBurst  
Mode operation maintains efficiency at light load. An  
auxiliary reference input (CTRL) allows the user to over-  
ride the internal 1.25V feedback reference with any lower  
value, allowing full control of the output voltage during  
operation. A PGOOD pin sinks current when the output  
voltage reaches 90% of final value.  
■
Tiny Solution Size  
Low Quiescent Current:  
■
150µA in Active Mode (VIN = 3.6V, VOUT = 15V,  
No Load)  
1µA in Shutdown Mode  
■
Internal 1A, 36V Switch  
■
Integrated Schottky Diode  
■
Integrated PNP Output Disconnect  
■
Internal Reference Override Pin  
■
PGOOD Pin  
■
25V at 80mA from 3.6V Input  
■
Auxiliary NPNs for Intermediate  
Bias Voltages (LT3473A)  
Automatic Burst Mode® Operation at Light Load  
■
TheLT3473AincludestwoNPNtransistorsforgenerating  
intermediate bias voltages from the output and is offered  
in a 12-lead (4mm × 3mm) DFN package. The LT3473  
does not include these NPNs and is offered in an 8-lead  
(3mm × 3mm) package.  
■
Constant Switching Frequency: 1.2MHz  
Thermal Shutdown  
Input Range: 2.2V to 16V  
■
■
■
Low Profile (3mm × 3mm) DFN Package (LT3473)  
Low Profile (4mm × 3mm) DFN Package (LT3473A)  
■
U
The rugged 36V switch and output disconnect circuitry  
allow outputs up to 34V to be easily generated in a simple  
boost topology.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
APPLICATIO S  
■
OLED Bias  
CCD Bias  
■
U
TYPICAL APPLICATIO  
Conversion Efficiency and Power Loss vs Output Current  
80  
75  
70  
65  
60  
55  
500  
400  
300  
200  
100  
0
V
V
= 3.6V  
OUT  
IN  
= 15V  
V
OUT  
25V  
PGOOD  
CTRL  
OUT  
80mA  
2.2µF  
6.8µH  
LT3473  
V
IN  
3V TO 4.2V  
SW  
CAP  
FB  
V
IN  
2M  
0.47µF  
SHDN  
100k  
GND  
4.7µF  
3473 TA01a  
0.1  
1
10  
OUTPUT CURRENT (mA)  
100  
3473 TA01b  
3473f  
1
1234567...12

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