lt3467aes67 Linear Technology Corporation, lt3467aes67 Datasheet

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lt3467aes67

Manufacturer Part Number
lt3467aes67
Description
1.1a Step-up Dc/dc Converter With Integrated Soft-start
Manufacturer
Linear Technology Corporation
Datasheet
TYPICAL APPLICATIO
FEATURES
APPLICATIO S
Digital Cameras
White LED Power Supplies
Cellular Phones
Medical Diagnostic Equipment
Local 5V or 12V Supplies
TFT-LCD Bias Supplies
xDSL Power Supplies
1.3MHz Switching Frequency (LT3467)
2.1MHz Switching Frequency (LT3467A)
Low V
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
Low Profile (0.75mm) 8-Lead (3mm x 2mm)
DFN Package
2.6V TO
4.2V
V
IN
CESAT
0.047μF
OFF ON
4.7μF
Switch: 330mV at 1.1A
Single Li-Ion Cell to 5V Boost Converter
U
SHDN
SS
V
IN
LT3467
2.7μH
GND
SW
FB
Package
U
402k
133k
3.3pF
3467 TA01a
15μF
V
5V
765mA AT V
540mA AT V
360mA AT V
OUT
DESCRIPTIO
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LT
42V, 1.1A switch with a soft-start function. Pin compatible
with the LT1930, its low V
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 re-
sults 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 x 2mm DFN package.
IN
IN
IN
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
= 4.2V,
= 3.3V,
= 2.6V
®
3467/LT3467A switching regulators combine a
1.1A Step-Up DC/DC
Integrated Soft-Start
95
90
85
80
75
70
65
60
55
50
U
100
200 300 400 500
Converter with
CESAT
LT3467/LT3467A
V
Efficiency
IN
bipolar switch enables the
I
OUT
= 2.6V
(mA)
V
IN
600
= 3.3V
700 800
V
IN
3467 TA01b
= 4.2V
900
3467afc
1

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lt3467aes67 Summary of contents

Page 1

... The LT3467/ LT3467A are available in a low profile (1mm) 6-lead SOT-23 package and tiny 3mm x 2mm DFN package. , 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. ...

Page 2

... LT3467IS5 LT3467IS6#TR LT3467ES6 LT3467ES6#TR LT3467AES67 LT3467AES6#TR Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are T the LT3467 and LT3467A unless otherwise noted. PARAMETER Minimum Operating Voltage Maximum Operating Voltage Feedback Voltage FB Pin Bias Current Quiescent Current Quiescent Current in Shutdown Reference Line Regulation Switching Frequency Maximum ...

Page 4

LT3467/LT3467A W U TYPICAL PERFOR A CE CHARACTERISTICS Quiescent Current vs Temperature 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 –40 –25 – 110 125 TEMPERATURE (°C) 3467 G01 Current Limit vs ...

Page 5

CTIO S (DFN/TSOT) FB (Pin 1/Pin 3): Feedback Pin. Reference voltage is 1.255V. Connect resistive divider tap here. Minimize trace area at FB. Set V = 1.255V(1 + R1/R2). OUT GND (Pins 2, 5, 9/Pin ...

Page 6

LT3467/LT3467A U OPERATIO The LT3467 uses a constant frequency, current-mode control scheme to provide excellent line and load regula- tion. Refer to the Block Diagram above. At the start of each oscillator cycle, the SR latch is set which turns ...

Page 7

U U APPLICATIONS INFORMATION L1 2.7μ 2.6V TO 4.2V C1 4.7μ SHDN OFF ON LT3467 SS C3 GND 0.047μF C1, C2: X5R OR X7R, 6.3V D1: ON SEMICONDUCTOR MBRM120 L1: SUMIDA CR43-2R7 Figure 2. Single Li-Ion ...

Page 8

LT3467/LT3467A U U APPLICATIONS INFORMATION CAPACITOR SELECTION Low ESR (equivalent series resistance) capacitors should be used at the output to minimize the output ripple voltage. Multi-layer ceramic capacitors are an excellent choice, as they have extremely low ESR and are ...

Page 9

U U APPLICATIONS INFORMATION LOAD CURRENT 100mA/DIV AC COUPLED V OUT 200mV/DIV AC COUPLED I L1 5A/DIV AC COUPLED 20μs/DIV Figure 3. Transient Response of Figure 8's Step-Up Converter without Phase Lead Capacitor LOAD CURRENT 100mA/DIV AC COUPLED V OUT ...

Page 10

LT3467/LT3467A U U APPLICATIONS INFORMATION Compensation—Theory Like all other current mode switching regulators, the LT3467/LT3467A needs to be compensated for stable and efficient operation. Two feedback loops are used in the LT3467/LT3467A: a fast current loop which does not require ...

Page 11

U U APPLICATIONS INFORMATION Using the circuit of Figure example, the following table shows the parameters used to generate the Bode plot shown in Figure –10 –20 –30 GAIN –40 ...

Page 12

LT3467/LT3467A U TYPICAL APPLICATIO 6.5V 4-CELL BATTERY C1, C3: X5R or X7R, 10V C2: X5R or X7R, 6. C1: X5R or X7R, 6. C5: X5R or X7R, 16V D1 TO D4: PHILIPS ...

Page 13

U TYPICAL APPLICATIO S 9V, 18V, –9V Triple Output TFT-LCD Bias Supply with Soft-Start L1 4.7μ 3.3V C1 2.2μ SHDN SHDN LT3467 SS 3.3V GND C7 0V 0.1μF C1: X5R OR X7R, 6.3V C2,C3, C5, ...

Page 14

LT3467/LT3467A U TYPICAL APPLICATIO S Single Li-Ion Cell to 5V Boost Converter L1 0.9μ 2. 4.7μF SHDN OFF ON LT3467A GND 0.047μF C1, C2: X5R OR X7R, 6.3V D1: ...

Page 15

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U DDB Package 8-Lead Plastic DFN (3mm × ...

Page 16

... LTC3402 3MHz, Synchronous Step-Up DC/DC Converter SW LT3464 85mA (I ), High Efficiency Step-Up DC/DC Converter SW with Integrated Schottky and PNP Disconnect trademark of Linear Technology Corporation. SENSE Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● V OUT 12V ...

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