LT3467AIS6 Datasheet, PDF (1/18 Pages) Linear Integrated Systems – 1.1A Step-Up DC/DC Converter with

FEATURES
n _{1.3MHz Switching Frequency (LT3467)}
n _{2.1MHz Switching Frequency (LT3467A)}
n _{Low VCESAT Switch: 330mV at 1.1A}
n _{High Output Voltage: Up to 40V}
n _{Wide Input Range: 2.4V to 16V}
n _{Dedicated Soft-Start Pin}
n _{5V at 540mA from 3.3V Input (LT3467)}
n _{5V at 430mA from 3.3V Input (LT3467A)}
n _{12V at 270mA from 5V Input (LT3467)}
n _{12V at 260mA from 5V Input (LT3467A)}
n _{Uses Small Surface Mount Components}
n _{Low Shutdown Current: <1μA}
n _{Pin-for-Pin Compatible with the LT1930 and LT1613}
n _{Low Profile (1mm) ThinSOT™ Package}
n _{Low Profile (0.75mm) 8-Lead (3mm × 2mm)}
DFN Package
APPLICATIONS
n _{Digital Cameras}
n _{White LED Power Supplies}
n _{Cellular Phones}
n _{Medical Diagnostic Equipment}
n _{Local 5V or 12V Supplies}
n _{TFT-LCD Bias Supplies}
n _{xDSL Power Supplies}
LT3467/LT3467A
1.1A Step-Up DC/DC
Converter with
Integrated Soft-Start
DESCRIPTION
The LT^®3467/LT3467A switching regulators combine a
42V, 1.1A switch with a soft-start function. Pin compatible
with the LT1930, its low V_CESAT bipolar switch enables the
device to deliver high current outputs in a small footprint.
The LT3467 switches at 1.3MHz, allowing the use of tiny,
low cost and low height inductors and capacitors. The
LT3467A switches at 2.1MHz, allowing the use of even
smaller components. High inrush current at start-up is
eliminated using the programmable soft-start function.
A single external capacitor sets the current ramp rate. A
constant frequency current mode PWM architecture results
in low, predictable output noise that is easy to filter.
The high voltage switch on the LT3467/LT3467A is rated
at 42V, making the devices ideal for boost converters up
to 40V as well as SEPIC and flyback designs. The LT3467
can generate 5V at up to 540mA from a 3.3V supply or
5V at 450mA from four alkaline cells in a SEPIC design.
The LT3467A can generate 5V at up to 430mA from a 3.3V
supply or 15V at 135mA from a 3.3V supply. The LT3467/
LT3467A are available in a low profile (1mm) 6-lead SOT-23
package and tiny 3mm × 2mm DFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo 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.
TYPICAL APPLICATION
V_IN
2.6V TO
4.2V
Single Li-Ion Cell to 5V Boost Converter
2.7μH
4.7μF
OFF ON
0.047μF
V_IN
SW
SHDN
LT3467
SS
FB
GND
402k
3.3pF
V_OUT
5V
765mA AT V_IN = 4.2V,
540mA AT V_IN = 3.3V,
360mA AT V_IN = 2.6V
133k
15μF
3467 TA01a
Efficiency
95
90
85
V_IN = 4.2V
V_IN = 3.3V
80
V_IN = 2.6V
75
70
65
60
55
50
100 200 300 400 500 600 700 800 900
I_OUT (mA)
3467 TA01b
3467afe
1