LT3472

1

3472f

TYPICAL APPLICATIO

APPLICATIO S

FEATURES

DESCRIPTIO

from a Li-Ion Cell

■

Output Voltages Up to ±34V

Value Before Negative Output Begins

Noise Outputs

Boost and Inverting

DC/DC Converter

for CCD Bias

The LT

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

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.

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.

SWP

SWN

SSP

GND

SSN

FBP

SHDN

FBN

DN

LT3472

2.2µF

2.2µF

2.2µF

100nF

47µH

100nF

550k

320k

1µF

22µH47µH

SHDN

3V TO 4.2V

15V

20mA

–8V

50mA

3472 TA01a

4.7pF

10pF

Conversion Efficiency

LOAD CURRENT (mA)

0

20

40

50

85

80

75

70

65

60

55

50

45

40

3472 TA01b

10

30

POS CHANNEL

NEG CHANNEL

Li-Ion CCD Bias Supply