LT3467/LT3467A
1.1A Step-Up DC/DC
Converter with
Integrated Soft-Start
FEATURES DESCRIPTION
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1.3MHz Switching Frequency (LT3467) The LT 3467/LT3467A switching regulators combine a
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2.1MHz Switching Frequency (LT3467A) 42V, 1.1A switch with a soft-start function. Pin compatible
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Low V Switch: 330mV at 1.1A with the LT1930, its low V bipolar switch enables the
CESAT CESAT
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High Output Voltage: Up to 40V device to deliver high current outputs in a small footprint.
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Wide Input Range: 2.4V to 16V The LT3467 switches at 1.3MHz, allowing the use of tiny,
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Dedicated Soft-Start Pin low cost and low height inductors and capacitors. The
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5V at 540mA from 3.3V Input (LT3467) LT3467A switches at 2.1MHz, allowing the use of even
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5V at 430mA from 3.3V Input (LT3467A) smaller components. High inrush current at start-up is
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12V at 270mA from 5V Input (LT3467) eliminated using the programmable soft-start function.
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12V at 260mA from 5V Input (LT3467A) A single external capacitor sets the current ramp rate. A
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Uses Small Surface Mount Components constant frequency current mode PWM architecture results
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Low Shutdown Current: <1A in low, predictable output noise that is easy to lter.
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Pin-for-Pin Compatible with the LT1930 and LT1613
The high voltage switch on the LT3467/LT3467A is rated
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Low Pro le (1mm) ThinSOT Package
at 42V, making the devices ideal for boost converters up
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Low Pro le (0.75mm) 8-Lead (3mm 2mm)
to 40V as well as SEPIC and yback designs. The LT3467
DFN Package
can generate 5V at up to 540mA from a 3.3V supply or
5V at 450mA from four alkaline cells in a SEPIC design.
APPLICATIONS
The LT3467A can generate 5V at up to 430mA from a 3.3V
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Digital Cameras
supply or 15V at 135mA from a 3.3V supply. The LT3467/
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White LED Power Supplies
LT3467A are available in a low pro le (1mm) 6-lead SOT-23
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Cellular Phones
package and tiny 3mm 2mm DFN package.
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Medical Diagnostic Equipment
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
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Local 5V or 12V Supplies
trademarks are the property of their respective owners.
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TFT-LCD Bias Supplies
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xDSL Power Supplies
TYPICAL APPLICATION
Ef ciency
95
Single Li-Ion Cell to 5V Boost Converter
90
V = 4.2V
2.7H IN
V
85
IN
V
OUT
2.6V TO
V = 3.3V
IN
5V
80
4.2V
V = 2.6V
765mA AT V = 4.2V,
IN IN
4.7F 402k
540mA AT V = 3.3V,
IN
V SW
IN 75
360mA AT V = 2.6V
IN
SHDN
OFF ON
3.3pF 70
LT3467
SS FB
65
GND
15F 60
0.047F 133k
55
3467 TA01a 50
100 300 400 500 700 800 900
200 600
I (mA)
OUT
3467 TA01b
3467afe
1
EFFICIENCY (%)LT3467/LT3467A
ABSOLUTE MAXIMUM RATINGS (Note 1)
V Voltage ................................................................16V Operating Junction Temperature Range (Note 2)
IN
SW Voltage ................................................ 0.4V to 42V E Grade ................................................ 40C to 85C
FB Voltage ................................................................2.5V I Grade ............................................... 40C to 125C
Current Into FB Pin .............................................. 1mA Storage Temperature Range ................... 65C to 150C
SHDN Voltage ......................................................... 16V Lead Temperature (Soldering, 10 sec)
Maximum Junction Temperature ......................... 125C TSOT .................................................................300C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
FB 1 8 SHDN
SW 1 6 V
IN
GND 2 7 SS
9
GND 2 5 SS
SW 3 6 V
IN
FB 3 4SHDN
SW GND
4 5
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
DDB PACKAGE
8-LEAD (3mm s 2mm) PLASTIC DFN
T = 125C, = 165C/W, = 102C/W
JMAX JA JC
T = 125C, = 80C/W
JMAX JA
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3467EDDB#PBF LT3467EDDB#TRPBF LCPX 40C to 85C
8-Lead (3mm 2mm) Plastic DFN
LT3467IDDB#PBF LT3467IDDB#TRPBF LCPX 40C to 125C
8-Lead (3mm 2mm) Plastic DFN
LT3467AEDDB#PBF LT3467AEDDB#TRPBF LCKD 40C to 85C
8-Lead (3mm 2mm) Plastic DFN
LT3467AIDDB#PBF LT3467AIDDB#TRPBF LCKD 40C to 125C
8-Lead (3mm 2mm) Plastic DFN
LT3467IS6#PBF LT3467IS6#TRPBF LTACH 6-Lead Plastic TSOT-23 40C to 125C
LT3467ES6#PBF LT3467ES6#TRPBF LTACH 6-Lead Plastic TSOT-23 40C to 85C
LT3467AES6#PBF LT3467AES6#TRPBF LTBCC 6-Lead Plastic TSOT-23 40C to 85C
LT3467AIS6#PBF LT3467AIS6#TRPBF LTBCC 6-Lead Plastic TSOT-23 40C to 125C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3467EDDB LT3467EDDB#TR LCPX 40C to 85C
8-Lead (3mm 2mm) Plastic DFN
LT3467IDDB LT3467IDDB#TR LCPX 40C to 125C
8-Lead (3mm 2mm) Plastic DFN
LT3467AEDDB LT3467AEDDB#TR LCKD 40C to 85C
8-Lead (3mm 2mm) Plastic DFN
LT3467AIDDB LT3467AIDDB#TR LCKD 40C to 125C
8-Lead (3mm 2mm) Plastic DFN
LT3467IS6 LT3467IS6#TR LTACH 6-Lead Plastic TSOT-23 40C to 125C
LT3467ES6 LT3467ES6#TR LTACH 6-Lead Plastic TSOT-23 40C to 85C
LT3467AES67 LT3467AES6#TR LTBCC 6-Lead Plastic TSOT-23 40C to 85C
LT3467AIS67 LT3467AIS67#TR LTBCC 6-Lead Plastic TSOT-23 40C to 125C
Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container.
For more information on lead free part marking, go to: