LT3467/LT3467A
1.1A Step-Up DC/DC
Converter with Integrated Soft-Start
FEATURES
DESCRIPTION
The LT®3467/LT3467A switching regulators combine a
n
1.3MHz Switching Frequency (LT3467)
n
2.1MHz Switching Frequency (LT3467A)
42V, 1.1A switch with a soft-start function. Pin compatible
with the LT1930, its low VCESAT 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.
n
n
n
n
n
n
n
n
n
n
n
n
n
Low V
Switch: 330mV at 1.1A
CESAT
High Output Voltage: Up to 40V
Wide Input Range: 2.4V to 16V
Dedicated Soft-Start Pin
5V at 540mA from 3.3V Input (LT3467)
5V at 430mA from 3.3V Input (LT3467A)
12V at 270mA from 5V Input (LT3467)
12V at 260mA from 5V Input (LT3467A)
Uses Small Surface Mount Components
Low Shutdown Current: <1µA
Pin-for-Pin Compatible with the LT1930 and LT1613
Low Profile (1mm) ThinSOT Package
Low Profile (0.75mm) 8-Lead (3mm × 2mm)
DFN Package
AEC-Q100 Qualified for Automotive Applications
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.
™
n
APPLICATIONS
n
Digital Cameras
n
White LED Power Supplies
n
Cellular Phones
All registered trademarks and trademarks are the property of their respective owners.
n
Medical Diagnostic Equipment
n
Local 5V or 12V Supplies
n
TFT-LCD Bias Supplies
n
xDSL Power Supplies
TYPICAL APPLICATION
Efficiency
ꢐꢑ
ꢐꢏ
Single Li-Ion Cell to 5V Boost Converter
ꢙ
ꢚ ꢕ.ꢘꢙ
ꢉ.ꢎꢏH
ꢀꢋ
ꢚ ꢔ.ꢔꢙ
ꢃ
ꢒꢑ
ꢒꢏ
ꢓꢑ
ꢓꢏ
ꢎꢑ
ꢎꢏ
ꢑꢑ
ꢑꢏ
ꢄꢁ
ꢃ
ꢌꢙꢋ
ꢗꢃ
ꢎꢊꢗꢚꢔ ꢔꢋ ꢃ ꢛ ꢍ.ꢉ ꢜ
ꢉ.ꢊꢃ ꢋꢌ
ꢍ.ꢉꢃ
ꢙ
ꢀꢋ
ꢙ
ꢚ ꢘ.ꢎꢙ
ꢀꢋ
ꢄꢁ
ꢍ.ꢎꢏꢇ
ꢍꢐꢉꢑ
ꢕꢓꢓꢑ
ꢗꢍꢐꢚꢔ ꢔꢋ ꢃ ꢛ ꢓ.ꢓ ꢜ
ꢄꢁ
ꢓꢊꢐꢚꢔ ꢔꢋ ꢃ ꢛ ꢉ.ꢊꢃ
ꢃ
ꢅꢆ
ꢄꢁ
ꢄꢁ
SHDN
ꢌꢇꢇ ꢌꢁ
ꢓ.ꢓꢘꢇ
ꢒꢋꢓꢍꢊꢎ
ꢅꢅ
ꢇꢈ
ꢀꢁꢂ
ꢕꢗꢏꢇ
ꢐ.ꢐꢍꢎꢏꢇ
ꢓꢍꢊꢎ ꢋꢔꢐꢕꢖ
ꢒꢏꢏ
ꢐꢏꢏ
ꢖꢏꢏ
ꢔꢏꢏ ꢕꢏꢏ ꢑꢏꢏ
ꢓꢏꢏ
ꢘꢏꢏ
ꢎꢏꢏ
ꢀ
ꢄꢅꢆꢇ
ꢁꢂꢃ
ꢔꢕꢎꢓ ꢃꢆꢏꢖꢗ
Rev. H
1
Document Feedback
For more information www.analog.com