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LT3471

更新时间： 2024-12-01 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
16页 299K
描述
3mm x 3mm DFN 封装的双通道 1.3A、1.2MHz 升压/负输出转换器

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中文翻译

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LT3471 数据手册

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LT3471  
Dual 1.3A, 1.2MHz  
Boost/Inverter in  
3mm × 3mm DFN  
FEATURES  
DESCRIPTION  
n
1.2MHz Switching Frequency  
The LT®3471 dual switching regulator combines two 42V,  
1.3A switches with error amplifiers that can sense to  
ground providing boost and inverting capability. The low  
n
Low V  
Switches: 330mV at 1.3A  
CESAT  
n
n
n
n
n
n
n
n
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High Output Voltage: Up to 40V  
Wide Input Range: 2.4V to 16V  
Inverting Capability  
5V at 630mA from 3.3V Input  
12V at 320mA from 5V Input  
–12V at 200mA from 5V Input  
Uses Tiny Surface Mount Components  
Low Shutdown Current: <1μA  
Low Profile (0.75mm) 10-Lead 3mm × 3mm  
DFN Package  
V
CESAT  
bipolar switches enable the device to deliver high  
current outputs in a small footprint. The LT3471 switches  
at1.2MHz,allowingtheuseoftiny,lowcostandlowprofile  
inductors and capacitors. High inrush current at start-up  
is eliminated using the programmable soft-start function,  
whereanexternalRCsetsthecurrentramprate.Aconstant  
frequency current mode PWM architecture results in low,  
predictable output noise that is easy to filter.  
The LT3471 switches are rated at 42V, making the device  
ideal for boost converters up to 40V as well as SEPIC  
and flyback designs. Each channel can generate 5V at  
up to 630mA from a 3.3V supply, or 5V at 510mA from  
four alkaline cells in a SEPIC design. The device can be  
configured as two boosts, a boost and inverter or two  
inverters.  
APPLICATIONS  
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Organic LED Power Supply  
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Digital Cameras  
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White LED Power Supply  
Cellular Phones  
Medical Diagnostic Equipment  
Local 5V or 12V Supply  
TFT-LCD Bias Supply  
xDSL Power Supply  
n
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The LT3471 is available in a low profile (0.75mm) 10-lead  
3mm × 3mm DFN package.  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
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TYPICAL APPLICATION  
OLED Driver  
2.2μH  
OLED Driver Efficiency  
V
OUT1  
V
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
IN  
7V  
3.3V  
350mA  
90.9k  
15k  
4.7μF  
V
OUT1  
= 7V  
CONTROL 1  
SW1  
4.7k  
SHDN/SS1  
FB1N  
FB1P  
0.33μF  
V
OUT1  
= –7V  
V
REF  
0.1μF  
V
V
LT3471  
IN  
IN  
10μF  
4.7k  
15k  
FB2N  
FB2P  
CONTROL 2  
SHDN/SS2  
GND  
SW2  
0.33μF  
75pF  
3471 TA01  
105k  
1μF  
10μH  
15μH  
V
–7V  
250mA  
OUT2  
200  
0
100  
300  
400  
V
IN  
I
(mA)  
OUT  
10μF  
3471 TA01b  
3471fb  
1
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