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LT3461ES6 Datasheet

  • LT3461ES6

  • 1.3MHz/3MHz Step-Up DC/DC Converters with Integrated Schottk...

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LT3461/LT3461A
1.3MHz/3MHz Step-Up
DC/DC Converters with
Integrated Schottky in ThinSOT
FEATURES
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DESCRIPTIO
Integrated Schottky Rectifier
Fixed Frequency 1.3MHz/3MHz Operation
High Output Voltage: Up to 38V
Low V
CESAT
Switch: 260mV at 250mA
12V at 70mA from 5V Input
5V at 115mA from 3.3V Input
Wide Input Range: 2.5V to 16V
Uses Small Surface Mount Components
Low Shutdown Current: <1碌A
Soft-Start
Low Profile (1mm) SOT-23 (ThinSOT
TM
) Package
APPLICATIO S
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Digital Cameras
CCD Bias Supply
XDSL Power Supply
TFT-LCD Bias Supply
Local 5V or 12V Supply
Medical Diagnostic Equipment
Battery Backup
The LT
廬
3461/LT3461A are general purpose fixed fre-
quency current mode step-up DC/DC converters. Both
devices feature an integrated Schottky and a low V
CESAT
switch allowing a small converter footprint and lower parts
cost. The LT3461 switches at 1.3MHz while the LT3461A
switches at 3MHz. These high switching frequencies en-
able the use of tiny, low cost and low height capacitors and
inductors. The constant switching frequency results in
predictable output noise that is easy to filter, and the
inductor based topology ensures an input free from switch-
ing noise typically present with charge pump solutions.
The high voltage switch in the LT3461/LT3461A is rated at
40V making the device ideal for boost converters up to
38V.
The LT3461/LT3461A are available in a low profile (1mm)
SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
L1
10碌H
1
SW
6
5
V
IN
V
OUT
LT3461A
4
3
SHDN
FB
GND
2
5V to 12V, 70mA Step-Up DC/DC Converter
85
V
IN
5V
C1
1碌F
OFF ON
80
EFFICIENCY (%)
261k
15pF
V
OUT
12V
70mA
75
30.1k
C2
1碌F
3461 TA01a
70
65
60
0
20
60
40
LOAD CURRENT (mA)
80
3461 TAO1b
U
Efficiency
V
IN
= 5V
V
IN
= 3.3V
3461af
U
U
1

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