LT3460/LT3460-1
1
3460fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.3 MHz/650kHz Step-Up
DC/DC Converter in SC70,
ThinSOT and DFN
The LT
®
3460/LT3460-1 are general purpose step-up DC/
DC converters. The LT3460/LT3460-1 switch at 1.3MHz/
650kHz, allowing the use of tiny, low cost and low height
capacitors and inductors. The constant frequency results
in low, predictable output noise that is easy to fi lter.
The high voltage switches in the LT3460/LT3460-1 are
rated at 38V, making the device ideal for boost converters
up to 36V. The LT3460 can generate 12V at up to 70mA
from a 5V supply.
The low 1mA quiescent current and 650kHz switching
frequency of LT3460-1 make it ideal for lower current
applications.
The LT3460 is available in SC70 and SOT-23 packages.
The LT3460-1 is available in SC70 and 2mm × 2mm DFN
packages.
5V to 12V, 70mA Step-Up DC/DC Converter
n
1.3MHz (LT3460) Switching Frequency
n
650kHz (LT3460-1) Switching Frequency
n
High Output Voltage: Up to 36V
n
300mA Integrated Switch (LT3460)
n
180mA Integrated Switch (LT3460-1)
n
Wide Input Range: 2.5V to 16V
n
Uses Small Surface Mount Components
n
Low Shutdown Current: <1μA
n
Low Profi le (1mm) SC70 (LT3460 and LT3460-1),
SOT-23 (ThinSOT™) (LT3460) and 2mm × 2mm DFN
(LT3460-1) Packages
n
Digital Cameras
n
CCD Bias Supply
n
XDSL Power Supply
n
TFT-LCD Bias Supply
n
Local 5V or 12V Supply
n
Medical Diagnostic Equipment
n
Battery Backup
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is
a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Effi ciency
Switching Waveforms
LOAD CURRENT (mA)
0
EFFICIENCY (%)
90
85
80
75
70
65
60
20 40 60 80
3460 F01a
0.2μs/DIV
3460 F01b
I
L
100mA/DIV
V
SW
5V/DIV
OFF ON
V
IN
5V
22μH
130k
15k
1μF
22pF
4.7μF
V
OUT
12V
70mA
V
IN
SW
FB
SHDN
GND
LT3460
3460 F01