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LBGC

更新时间： 2024-10-28 05:41:35

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
12页	223K
描述
Boost and Inverting DC/DC Converter for CCD Bias

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中文翻译

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LBGC 数据手册

LT3472

Boost and Inverting

DC/DC Converter

for CCD Bias

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

■

V_INRange: 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.

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.

TYPICAL APPLICATIO

Li-Ion CCD Bias Supply

Conversion Efficiency

3V TO 4.2V

2.2µF

1µF

22µH

47µH

POS CHANNEL

NEG CHANNEL

SWP

SWN

POS

15V

POS

20mA

550k

47µH

LT3472

GND

FBP

4.7pF

320k

10pF

NEG

–8V

FBN

50mA

SHDN

SSP

SSN

100nF

2.2µF

LOAD CURRENT (mA)

3472 TA01b

3472 TA01a

3472f

12 3 4 5 6 7...12

中文翻译

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