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LT3463 Datasheet

  • LT3463

  • Inverting Micropower DC/DC Converter with Schottky in ThinSO...

  • 151.35KB

  • 8頁

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LT3483
Inverting Micropower
DC/DC Converter with
Schottky in ThinSOT Package
FEATURES
鈻?/div>
鈻?/div>
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鈻?/div>
DESCRIPTIO
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鈻?/div>
鈻?/div>
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Internal 40V Schottky Diode
One Resistor Feedback (Other Resistor Inside)
Internal 40V, 200mA Power Switch
Generates Regulated Negative Outputs to 鈥?8V
Low Quiescent Current:
40碌A(chǔ) in Active Mode
<1碌A(chǔ) in Shutdown Mode
Low V
CESAT
Switch: 200mV at 150mA
Wide Input Range: 2.5V to 16V
Uses Small Surface Mount Components
Output Short-Circuit Protected
Available in a 6-Lead SOT-23 Package
APPLICATIO S
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LCD Bias
Handheld Computers
Battery Backup
Digital Cameras
OLED Bias
The LT
廬
3483 is a micropower inverting DC/DC converter
with integrated Schottky and one resistor feedback. The
small package size, high level of integration and use of tiny
surface mount components yield a solution size as small
as 40mm
2
. The device features a quiescent current of only
40碌A(chǔ) at no load, which further reduces to 0.1碌A(chǔ) in
shutdown. A current limited, fixed off-time control scheme
conserves operating current, resulting in high efficiency
over a broad range of load current. A precisely trimmed
10碌A(chǔ) feedback current enables one resistor feedback and
virtually eliminates feedback loading of the output. The
40V switch enables voltage outputs up to 鈥?8V to be
generated without the use of costly transformers. The
LT3483鈥檚 low 300ns off-time permits the use of tiny low
profile inductors and capacitors to minimize footprint and
cost in space-conscious portable applications.
The LT3483 is available in the low profile (1mm) SOT-23
(ThinSOT
TM
) package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
Patent pending.
TYPICAL APPLICATIO
0.22碌F
3.6V to 鈥?V DC/DC Converter
75
V
IN
3.6V
10碌H
Efficiency and Power Loss
V
IN
= 3.6V
EFFICIENCY
1000
10鈩?/div>
V
IN
4.7碌F
LT3483
SHDN
FB
GND
D
5pF
806k
EFFICIENCY (%)
70
V
OUT
鈥?V
25mA
2.2碌F
SW
65
POWER
LOSS
60
3483 TA01a
55
0.1
1
10
LOAD CURRENT (mA)
U
100
POWER LOSS (mW)
U
U
10
1
0.1
100
3483 TA01b
3483f
1

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