1

LT3463/LT3463A

3463f

Dual Micropower

DC/DC Converters

with Schottky Diodes

, LTC and LT are registered trademarks of Linear Technology Corporation.

CCD Bias Supply (15V, –8V)

Efficiency and Power Loss

The LT

verters with internal Schottky diodes in a 10-lead 3mm

×

3mm DFN package. Negative and positive LT3463 con-

verters have a 250mA current limit. The LT3463A positive

converter also has a 250mA limit, while the negative

converter has a 400mA limit. Both devices have an input

voltage range of 2.4V to 15V, making them ideal for a wide

variety of applications. Each converter features a quies-

cent current of only 20

µA, which drops to under 1µA in

shutdown. A current limited, fixed off-time control scheme

conserves operating current, resulting in high efficiency

over a broad range of load current. The 42V switch enables

high voltage outputs up to

±40V to be easily generated

without the use of costly transformers. The low 300ns off-

time permits the use of tiny, low profile inductors and

capacitors to minimize footprint and cost in space-con-

scious portable applications.

s

Generates Well-Regulated Positive and

Negative Outputs

s

Low Quiescent Current:

20

<1

s

Internal 42V Power Switches

s

Internal 42V Schottky Diodes

s

s

Input Voltage Range: 2.4V to 15V

s

High Output Voltages: Up to

±40V

s

Low Profile (0.8mm) 3mm x 3mm DFN Package

s

CCD Bias

s

LCD Bias

s

Handheld Computers

s

Digital Cameras

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

15V

10mA

–8V

50mA

SW1

FB2

LT3463A

10

µH

SHDN2

2.2

µF

2.7V

TO 5V

3463 TA01a

GND

SW2

D2

1

µF

4.7

µF

FB1

SHDN1

1M

1M

10pF

154k

90.9k

4.7

µF

10

µH

LOAD CURRENT (mA)

0.1

50

70

75

80

1

10

100

3463 TA01b

65

–8V LOSS

60

55

0

160

200

240

120

80

40

15V EFFICIENCY

–8V EFFICIENCY

15V LOSS