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LT3472

更新时间： 2024-12-01 14:58:19
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
12页 227K
描述
用于 CCD 偏置的升压和负输出 DC/DC 转换器

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中文翻译

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LT3472 数据手册

 浏览型号LT3472的Datasheet PDF文件第2页浏览型号LT3472的Datasheet PDF文件第3页浏览型号LT3472的Datasheet PDF文件第4页浏览型号LT3472的Datasheet PDF文件第5页浏览型号LT3472的Datasheet PDF文件第6页浏览型号LT3472的Datasheet PDF文件第7页 
LT3472  
Boost and Inverting  
DC/DC Converter  
for CCD Bias  
U
FEATURES  
DESCRIPTIO  
The LT®3472 dual channel switching regulator generates  
positive and negative outputs for biasing CCD imagers.  
The device delivers up to –8V at 50mA and 15V at 20mA  
from a lithium-ion cell, providing bias for many popular  
CCD imagers. Switching at 1.1MHz, the LT3472 uses tiny,  
low profile capacitors and inductors and generates low  
noise outputs that are easy to filter. Schottky diodes are  
internal and the output voltages are set with one resistor  
per channel, reducing external component count. The  
entire solution is less than 1mm profile and occupies just  
50mm2.  
■
Generates 15V at 20mA, –8V at 50mA  
from a Li-Ion Cell  
■
Internal Schottky Diodes  
■
VIN Range: 2.2V to 16V  
Output Voltages Up to ±34V  
Capacitor-Programmable Soft-Start  
■
■
■
Sequencing: Positive Output Reaches 88% of Final  
Value Before Negative Output Begins  
■
Requires Only One Resistor to Set Output Voltage  
■
Constant Switching Frequency Ensures Low  
Noise Outputs  
■
Available in a 10-Lead (3mm × 3mm) DFN Package  
Internal sequencing circuitry disables the negative chan-  
nel until the positive channel has reached 88% of its final  
value, ensuring that the sum of the two outputs is always  
positive. Separate soft-start capacitors for each output  
allow the ramp of each output to be independently  
controlled.  
U
APPLICATIO S  
■
CCD Bias  
■
TFT LCD Bias  
■
OLED Bias  
■
± Rail Generation for Op Amps  
The LT3472 is available in a low profile (0.75mm) 10-pin  
3mm × 3mm DFN package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Li-Ion CCD Bias Supply  
V
IN  
Conversion Efficiency  
3V TO 4.2V  
2.2µF  
85  
1µF  
22µH  
47µH  
80  
75  
70  
65  
60  
55  
50  
45  
40  
POS CHANNEL  
NEG CHANNEL  
SWP  
V
SWN  
DN  
IN  
V
POS  
15V  
V
POS  
20mA  
550k  
47µH  
LT3472  
GND  
FBP  
4.7pF  
V
320k  
10pF  
NEG  
–8V  
FBN  
50mA  
SHDN  
SHDN  
SSP  
SSN  
100nF  
100nF  
2.2µF  
2.2µF  
0
40  
50  
10  
20  
30  
LOAD CURRENT (mA)  
3472 TA01b  
3472 TA01a  
3472f  
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