LT3472 LINER [Linear Technology], LT3472 Datasheet
LT3472
Manufacturer Part Number
LT3472
Description
Boost and Inverting DC/DC Converter for CCD Bias
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT3472.pdf
(12 pages)
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FEATURES
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TYPICAL APPLICATIO
APPLICATIO S
20mA
V
, LTC and LT are registered trademarks of Linear Technology Corporation.
15V
POS
Generates 15V at 20mA, –8V at 50mA
from a Li-Ion Cell
Internal Schottky Diodes
V
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
CCD Bias
TFT LCD Bias
OLED Bias
± Rail Generation for Op Amps
IN
Range: 2.2V to 16V
SHDN
4.7pF
550k
2.2µF
3V TO 4.2V
V
FBP
SHDN
SWP
SSP
POS
Li-Ion CCD Bias Supply
U
100nF
22µH
V
IN
LT3472
GND
V
IN
47µH
SWN
U
SSN
FBN
DN
2.2µF
100nF
320k
10pF
1µF
47µH
2.2µF
3472 TA01a
V
–8V
50mA
NEG
DESCRIPTIO
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
50mm
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.
2
®
.
3472 dual channel switching regulator generates
85
80
75
70
65
60
55
50
45
40
0
Boost and Inverting
DC/DC Converter
U
Conversion Efficiency
10
LOAD CURRENT (mA)
POS CHANNEL
NEG CHANNEL
20
for CCD Bias
30
40
3472 TA01b
LT3472
50
1
3472f
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