LT®3467/LT3467A switching regulators combine 42V, 1.1A switch with sof
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LT3467/LT3467A 1.1A Step-Up DC/DC Converter with Integrated Soft-Start DESCRIPTION
LT®3467/LT3467A switching regulators combine 42V, 1.1A switch with soft-start function. compatible with LT1930, VCESAT bipolar switch enables device deliver high current outputs small footprint. LT3467 switches 1.3MHz, allowing tiny, cost height inductors capacitors. LT3467A switches 2.1MHz, allowing even smaller components. High inrush current start-up eliminated using programmable soft-start function. single external capacitor sets current ramp rate. constant frequency current mode architecture results low, predictable output noise that easy filter. high voltage switch LT3467/LT3467A rated 42V, making devices ideal boost converters well SEPIC flyback designs. LT3467 generate 540mA from 3.3V supply 450mA from four alkaline cells SEPIC design. LT3467A generate 430mA from 3.3V supply 135mA from 3.3V supply. LT3467/ LT3467A available profile (1mm) 6-lead SOT-23 package tiny package.
Lare registered trademarks Linear Technology Corporation. ThinSOT trademark Linear Technology Corporation. other trademarks property their respective owners.
1.3MHz Switching Frequency (LT3467) 2.1MHz Switching Frequency (LT3467A) VCESAT Switch: 330mV 1.1A High Output Voltage: Wide Input Range: 2.4V Dedicated Soft-Start 540mA from 3.3V Input (LT3467) 430mA from 3.3V Input (LT3467A) 270mA from Input (LT3467) 260mA from Input (LT3467A) Uses Small Surface Mount Components Shutdown Current: Pin-for-Pin Compatible with LT1930 LT1613 Profile (1mm) ThinSOTPackage Profile (0.75mm) 8-Lead (3mm 2mm) Package
APPLICATIONS
Digital Cameras White Power Supplies Cellular Phones Medical Diagnostic Equipment Local Supplies TFT-LCD Bias Supplies xDSL Power Supplies
TYPICAL APPLICATION
Efficiency
VOUT 765mA 4.2V, 540mA 3.3V, 360mA 2.6V 3.3pF EFFICIENCY
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Single Li-Ion Cell Boost Converter
2.6V 4.2V 4.7F SHDN LT3467 2.7H
4.2V 3.3V 2.6V
402k
133k
0.047F
IOUT (mA)
3467 TA01b
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LT3467/LT3467A ABSOLUTE MAXIMUM RATINGS (Note
Voltage .16V Voltage -0.4V Voltage .2.5V Current Into ±1mA SHDN Voltage Maximum Junction Temperature 125°C Operating Temperature Range (Note Grade -40°C 85°C Grade -40°C 125°C Storage Temperature Range. -65°C 150°C Lead Temperature (Soldering, sec) TSOT. 300°C
CONFIGURATION
VIEW SHDN VIEW SHDN
PACKAGE 8-LEAD (3mm 2mm) PLASTIC TJMAX 125°C, 80°C/W EXPOSED (PIN GND, MUST SOLDERED
PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX 125°C, 165°C/W, 102°C/W
ORDER INFORMATION
LEAD FREE FINISH LT3467EDDB#PBF LT3467IDDB#PBF LT3467AEDDB#PBF LT3467AIDDB#PBF LT3467IS6#PBF LT3467ES6#PBF LT3467AES6#PBF LT3467AIS6#PBF LEAD BASED FINISH LT3467EDDB LT3467IDDB LT3467AEDDB LT3467AIDDB LT3467IS6 LT3467ES6 LT3467AES67 LT3467AIS67 TAPE REEL LT3467EDDB#TRPBF LT3467IDDB#TRPBF LT3467AEDDB#TRPBF LT3467AIDDB#TRPBF LT3467IS6#TRPBF LT3467ES6#TRPBF LT3467AES6#TRPBF LT3467AIS6#TRPBF TAPE REEL LT3467EDDB#TR LT3467IDDB#TR LT3467AEDDB#TR LT3467AIDDB#TR LT3467IS6#TR LT3467ES6#TR LT3467AES6#TR LT3467AIS67#TR PART MARKING* LCPX LCPX LCKD LCKD LTACH LTACH LTBCC LTBCC PART MARKING* LCPX LCPX LCKD LCKD LTACH LTACH LTBCC LTBCC PACKAGE DESCRIPTION 8-Lead (3mm 2mm) Plastic 8-Lead (3mm 2mm) Plastic 8-Lead (3mm 2mm) Plastic 8-Lead (3mm 2mm) Plastic 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 PACKAGE DESCRIPTION 8-Lead (3mm 2mm) Plastic 8-Lead (3mm 2mm) Plastic 8-Lead (3mm 2mm) Plastic 8-Lead (3mm 2mm) Plastic 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 6-Lead Plastic TSOT-23 TEMPERATURE RANGE -40°C 85°C -40°C 125°C -40°C 85°C -40°C 125°C -40°C 125°C -40°C 85°C -40°C 85°C -40°C 125°C TEMPERATURE RANGE -40°C 85°C -40°C 125°C -40°C 85°C -40°C 125°C -40°C 125°C -40°C 85°C -40°C 85°C -40°C 125°C
Consult Marketing parts specified with wider operating temperature ranges. *The temperature grade identified label shipping container. more information lead free part marking, http://www.linear.com/leadfree/ more information tape reel specifications,
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LT3467/LT3467A ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Operating Voltage Maximum Operating Voltage Feedback Voltage Bias Current Quiescent Current Quiescent Current Shutdown Reference Line Regulation Switching Frequency (Note VSHDN 2.4V, Switching VSHDN 0.5V, 2.6V LT3467 LT3467A LT3467A LT3467 LT3467 LT3467A LT3467A Minimum Duty Cycle Maximum Duty Cycle (Note 1.1A VSHDN VSHDN 0.5V
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VSHDN unless otherwise noted. Specifications both LT3467 LT3467A unless otherwise noted.
CONDITIONS 1.230 1.220 1.255 0.01 0.01 0.01 1.270 1.280 0.05 UNITS
Maximum Duty Cycle
Minimum Duty Cycle Switch Current Limit Switch VCESAT Switch Leakage Current SHDN Input Voltage High SHDN Input Voltage SHDN Bias Current Charging Current
Note Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. Exposure Absolute Maximum Rating condition extended periods affect device reliability lifetime. Note LT3467E/LT3467AE guaranteed meet performance specifications from 85°C. Specifications over -40°C 85°C operating temperature range assured design, characterization correlation with statistical process controls. LT3467IS6 guaranteed tested over full -40°C 125°C operating temperature range.
Note Current flows pin. Note Typical Performance Characteristics guaranteed current limit duty cycle.
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LT3467/LT3467A TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current Temperature
ISHDN (mA) TEMPERATURE (°C)
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Voltage Temperature
1.26 1.25 1.24 1.23 1.22 1.21 1.20
SHDN Current SHDN Voltage
25°C
TEMPERATURE (°C)
3467
VSHDN
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Current Limit Duty Cycle
ILIM GUARANTEED VCESAT 100mV/DIV TYPICAL 25°C
Switch Saturation Voltage Switch Current
2.50 2.25 OSCILLATOR FREQUENCY (MHz) 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25
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Oscillator Frequency Temperature
LT3467A
25°C 85°C
LT3467
-40°C
CURRENT 200mA/DIV
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TEMPERATURE (°C)
3467
Soft-Start Current Soft-Start Voltage
SWITCH CURRENT 25°C (mV)
3467
Peak Switch Current Soft-Start Voltage
25°C VSHDN 2V/DIV
Start-Up Waveform (Figure Circuit)
VOUT 1V/DIV
ISUPPLY 0.5A/DIV (mV)
3467
0.5ms/DIV
3467
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LT3467/LT3467A FUNCTIONS
(DFN/TSOT)
(Pin 1/Pin Feedback Pin. Reference voltage 1.255V. Connect resistive divider here. Minimize trace area VOUT 1.255V(1 R1/R2). (Pins 9/Pin Ground. directly local ground plane. (Pins 4/Pin Switch Pin. (Collector internal power switch) Connect inductor/diode here minimize metal trace area connected this minimize EMI.
(Pin 6/Pin Input Supply Pin. Must locally bypassed. (Pin 7/Pin Soft-Start Pin. Place soft-start capacitor here. Upon start-up, current charges capacitor 1.255V. larger capacitor slower start-up. Leave floating use. SHDN (Pin 8/Pin Shutdown Pin. 2.4V more enable device. Ground shut down.
BLOCK DIAGRAM
250k 1.255V REFERENCE
COMPARATOR
VOUT (EXTERNAL) (EXTERNAL)
RAMP GENERATOR SHUTDOWN SHDN 1.3MHz OSCILLATOR*
3467
Figure Block Diagram
*2.1MHz LT3467A
DRIVER
0.01
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LT3467/LT3467A OPERATION
LT3467 uses constant frequency, current-mode control scheme provide excellent line load regulation. Refer Block Diagram. start each oscillator cycle, latch which turns power switch voltage proportional switch current added stabilizing ramp resulting into positive terminal comparator When this voltage exceeds level negative input latch reset, turning power switch. level negative input error amplifier simply amplified version difference between feedback voltage reference voltage 1.255V. this manner, error amplifier sets correct peak current level keep output regulation. error amplifier's output increases, more current delivered output. Similarly, error decreases, less current delivered. soft-start feature LT3467 allows clean start-up conditions limiting rate voltage rise output comparator which, turn, limits peak switch current. soft-start connected reference voltage 1.255V through 250k resistor, providing current charge soft-start capacitor. Typical values soft-start capacitor range from 10nF 200nF LT3467 current limit circuit shown Block Diagram. switch current constantly monitored allowed exceed maximum switch current (typically 1.4A). switch current reaches this value, latch reset regardless state comparator This current limit protects power switch well external components connected LT3467. Block Diagram LT3467A (not shown) identical except that oscillator frequency 2.1MHz.
APPLICATIONS INFORMATION
Duty Cycle typical maximum duty cycle LT3467 (88% LT3467A). duty cycle given application given VOUT VOUT VCESAT Switching Frequency Inductor Selection LT3467 switches MHz, allowing small valued inductors used. 4.7H will usually suffice. LT3467A switches 2.1MHz, allowing even smaller valued inductors used. 0.9H 6.8H will usually suffice. Choose inductor that handle least 1.2A without saturating, ensure that inductor (copper-wire resistance) minimize power losses. Note that some applications, current handling requirements inductor lower, such SEPIC topology where each inductor only carries one-half total switch current. better efficiency, similar valued inductors with larger volume. Many different sizes shapes available from various manufacturers. Choose core material that losses 1.3MHz, (2.1MHz LT3467A) such ferrite core.
where diode forward voltage drop VCESAT worst case 330mV 1.1A) LT3467 LT3467A used higher duty cycles, must operated discontinuous conduction mode that actual duty cycle reduced. Setting Output Voltage determine output voltage. VOUT 1.255V R1/R2)
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LT3467/LT3467A APPLICATIONS INFORMATION
2.6V 4.2V 2.7H 4.7F 402k 3.3pF 133k VOUT 765mA 4.2V, 540mA 3.3V, 360mA 2.6V
SHDN LT3467
0.047F
X7R, 6.3V SEMICONDUCTOR MBRM120 SUMIDA CR43-2R7
3467 TA05a
Figure Single Li-Ion Cell Boost Converter (Same Page Application) Table Inductor Manufacturers
Sumida Murata (847) 956-0666 (847) 803-6100 (714) 852-2001 (408) 432-8331 www.sumida.com www.tdk.com www.murata.com www.fdk.co.jp
VOUT 1V/DIV
Supply Current Figure During Start-Up Without Soft-Start Capacitor
Soft-Start soft-start feature provides limit inrush current drawn from supply upon start-up. internal 250k resistor charges external soft-start capacitor 1.255V. After capacitor reaches 0.15V rate voltage rise output comparator tracks rate voltage rise soft-start capacitor. This limits inrush current drawn from supply during startup. soft-start feature plays another important role applications where switch will reach levels higher. During start-up, excessively high switch current, together with presence high voltage overstress switch. properly used soft-start feature will keep switch current from overshooting. This practice will greatly improve robustness such designs. Once part shut down, soft-start capacitor quickly discharged 0.4V, then slowly discharged through 250k resistor ground. part shut down re-enabled short period time while soft-start used, must ensure that soft-start capacitor enough time discharge before re-enabling part. Typical values soft-start capacitor range from 10nF 200nF
ISUPPLY 0.5A/DIV 0.1ms/DIV
3467 AI01
Supply Current Figure During Start-Up with 47nF Soft-Start Capacitor
VOUT 1V/DIV
ISUPPLY 0.5A/DIV 0.5ms/DIV
3467 AI02
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LT3467/LT3467A APPLICATIONS INFORMATION
Capacitor Selection (equivalent series resistance) capacitors should used output minimize output ripple voltage. Multi-layer ceramic capacitors excellent choice, they have extremely available very small packages. dielectrics preferred, followed X7R, these materials retain capacitance over wide voltage temperature ranges. 4.7F output capacitor sufficient most applications, systems with very output currents need only 2.2F output capacitor. Solid tantalum OS-CON capacitors used, they will occupy more board area than ceramic will have higher ESR. Always capacitor with sufficient voltage rating. Ceramic capacitors also make good choice input decoupling capacitor, which should placed close possible LT3467. 4.7F input capacitor sufficient most applications. Table shows list several ceramic capacitor manufacturers. Consult manufacturers detailed information their entire selection ceramic parts.
Table Ceramic Capacitor Manufacturers
Taiyo Yuden Murata (408) 573-4150 (803) 448-9411 (714) 852-2001 www.t-yuden.com www.avxcorp.com www.murata.com
phase lead zero intentionally introduced placing capacitor (C4) parallel with resistor (R1) between VOUT shown Figure frequency zero determined following equation.
choosing appropriate values resistor capacitor, zero frequency designed improve phase margin overall converter. typical target value zero frequency between 35kHz 55kHz. Figure shows transient response step-up converter from Figure without phase lead capacitor Although adequate many applications, phase margin ideal evidenced "bumps" both output voltage inductor current. 22pF capacitor results ideal phase margin, which revealed Figure more damped response less overshoot. Diode Selection Schottky diode recommended with LT3467 LT3467A. Philips PMEG 2005 very good choice. Where switch voltage exceeds 20V, PMEG 3005 diode). Where switch voltage exceeds 30V, PMEG 4005 diode). These diodes rated handle average forward current 0.5A. applications where average forward current diode exceeds 0.5A, Philips PMEG 2010 rated recommended. higher efficiency, diode with better thermal characteristics such Semiconductor MBRM120 diode) MBRM140 diode).
decision either (ceramic) capacitors higher (tantalum OS-CON) capacitors affect stability overall system. capacitor, along with capacitance itself, contributes zero system. tantalum OS-CON capacitors, this zero located lower frequency higher value ESR, while zero ceramic capacitor much higher frequency generally ignored.
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LT3467/LT3467A APPLICATIONS INFORMATION
LOAD CURRENT 100mA/DIV COUPLED VOUT 200mV/DIV COUPLED
Layout Hints high speed operation LT3467/LT3467A demands careful attention board layout. will advertised performance with careless layout. Figure shows recommended component placement ThinSOT package. Figure shows recommended component placement package. Note vias under Exposed Pad. These should connect local ground plane better thermal performance.
5A/DIV COUPLED 20s/DIV
3467
Figure Transient Response Figure Step-Up Converter without Phase Lead Capacitor
VOUT LOAD CURRENT 100mA/DIV COUPLED VOUT 200mV/DIV COUPLED
SHDN
5A/DIV COUPLED 20s/DIV
3467
VOUT
3467 F05a
Figure Suggested Layout-ThinSOT
VOUT
Figure Transient Response Figure Step-Up Converter with 22pF Phase Lead Capacitor
Setting Output Voltage output voltage, select values (see Figure according following equation.
SHDN
1.255V good value 13.3k which sets current resistor divider chain 1.255V/13.3k 94A.
VOUT
3467 F05b
Figure Suggested Layout-DFN
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LT3467/LT3467A APPLICATIONS INFORMATION
Compensation-Theory Like other current mode switching regulators, LT3467/LT3467A needs compensated stable efficient operation. feedback loops used LT3467/LT3467A: fast current loop which does require compensation, slower voltage loop which does. Standard Bode plot analysis used understand adjust voltage feedback loop. with feedback loop, identifying gain phase contribution various elements loop critical. Figure shows equivalent elements boost converter. Because fast current control loop, power stage inductor diode have been replaced equivalent transconductance amplifier gmp. acts current source where output current proportional voltage. Note that maximum output current finite current limit
From Figure gain, poles zeroes calculated follows: Output Pole: COUT
Error Pole: Error Zero: GAIN: 1.255 VOUT
Zero: Zero:
RESR COUT VIN2
VOUT
High Frequency Pole: Phase Lead Zero
VOUT RESR COUT
1.255V REFERENCE
Phase Lead Pole current mode zero right-half plane zero which issue feedback control design, manageable with proper external component selection.
COMPENSATION CAPACITOR COUT: OUTPUT CAPACITOR CPL: PHASE LEAD CAPACITOR gma: TRANSCONDUCTANCE AMPLIFIER INSIDE gmp: POWER STAGE TRANSCONDUCTANCE AMPLIFIER COMPENSATION RESISTOR OUTPUT RESISTANCE DEFINED VOUT DIVIDED ILOAD(MAX) OUTPUT RESISTANCE FEEDBACK RESISTOR DIVIDER NETWORK RESR: OUTPUT CAPACITOR
Figure Boost Converter Equivalent Model
3467
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LT3467/LT3467A APPLICATIONS INFORMATION
Using circuit Figure example, following table shows parameters used generate Bode plot shown Figure
GAIN (dB) GAIN PHASE 100k FREQUENCY (Hz) -135 PHASE (DEG) -180 -225 -270 -315 -360 -405 -450
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Table Bode Plot Parameters
PARAMETER COUT RESR VOUT VALUE 10.4 1.3* UNITS COMMENT Application Specific Application Specific Application Specific Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Application Specific Application Specific Adjustable Adjustable Application Specific Adjustable
Figure Bode Plot 3.3V Application
*2.1MHz LT3467A
From Figure phase -138° when gain reaches giving phase margin 42°. This more than adequate. crossover frequency 37kHz.
TYPICAL APPLICATIONS
Lithium-Ion Step-Up DC/DC Converter
2.2H 501k 1.8pF 133k VOUT 275mA 2.7V 490mA 3.8V 590mA 4.2V EFFICIENCY X7R, 6.3V SEMICONDUCTOR MBRM120 SUMIDA CR43-2R2
3467 TA02
Li-Ion
2.7V 4.2V 2.2F SHDN
4.2V 3.8V 2.7V
SHDN LT3467
0.047F
IOUT (mA)
3467 TA02b
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LT3467/LT3467A TYPICAL APPLICATIONS
4-Cell SEPIC Converter
2.2F SHDN 4-CELL BATTERY 0.047F X7R, X7R, 6.3V VOUT 325mA 400mA 450mA 6.5V 84.5k
6.5V
SHDN LT3467
255k
4.7pF
PHILIPS PMEG 2010 MURATA LQH32CN100K33L
3467 TA03
Boost Converter
2.7H 4.7F SHDN VOUT 20mA 412k 13.3k
SHDN LT3467
0.1F
X7R, 6.3V X7R, SEMICONDUCTOR, MBRM140 SUMIDA CD43-2R7
3467 TA04a
±15V Dual Output Converter with Output Disconnect
2.2F
100mA
SHDN LT3467
147k 2.2F 13.3k 2.2F
3467 TA05
0.047F
X7R, 6.3V X7R, PHILIPS PMEG 2005 SUMIDA CR43-100
-15V 100mA
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LT3467/LT3467A TYPICAL APPLICATIONS
18V, Triple Output TFT-LCD Bias Supply with Soft-Start
0.1F 3.3V 2.2F VSHDN SHDN LT3467 3.3V 0.1F X7R, 6.3V C2,C3, X7R, X7R, PHILIPS BAT54S EQUIVALENT PHILIPS PMEG 2005 PANASONIC ELT5KT4R7M 0.1F 4.7H 220mA 124k OUTPUT 5V/DIV OUTPUT 5V/DIV
10mA
Start-Up Waveforms
OUTPUT 10V/DIV
0.5A/DIV
2ms/DIV
3467 TA06b
10mA
3467 TA06a
23V, Triple Output TFT-LCD Bias Supply with Soft-Start
0.1F
0.1F
0.1F
10mA
Start-Up Waveforms
OUTPUT 5V/DIV OUTPUT 5V/DIV
3.3V 2.2F VSHDN
4.7H
270mA 113k OUTPUT 10V/DIV
SHDN LT3467 0.1F
3.3V
0.1F
X7R, 6.3V X7R, X7R, X7R, PHILIPS BAT54S EQUIVALENT PHILIPS PMEG 2005 PANASONIC ELT5KT4R7M
0.5A/DIV
3467 TA07a
2ms/DIV
3467 TA07b
10mA
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LT3467/LT3467A TYPICAL APPLICATIONS
Single Li-Ion Cell Boost Converter
2.6V 4.2V 4.7F 0.9H 8.06k 75pF VOUT 600mA 4.2V 360mA 3.3V 250mA 2.6V EFFICIENCY
3467 TA09a
Efficiency
SHDN LT3467A 2.67k
3.3V 2.6V
4.2V
0.047F
X7R, 6.3V PHILIPS PMEG 2010 MIPW3226D0R9M 1210 LARGER PACKAGE WITH ADDITION OTHERWISE OPTIONAL
IOUT (mA)
3467 TA09b
2.6V-3.3V Boost Converter
1.5H 8.06k 56pF VOUT 430mA 3.3V 270mA 2.6V EFFICIENCY X7R, 6.3V PHILIPS PMEG 2010 MIP3226D1R5M
3467 TA08a
Efficiency
2.6V 3.3V 4.7F
SHDN LT3467A 2.67k
2.6V
3.3V
0.047F
IOUT (mA)
3467 TA08b
3.3V 15V, 135mA Step-Up Converter
6.8H 16.5k 68pF 1.5k 2.2F VOUT 135mA EFFICIENCY
Efficiency
3.3V 4.7F
SHDN LT3467A
0.047F
X7R, 6.3V X7R, PHILIPS PMEG 2010 SUMIDA CMD4D13-6R8MC
3467 TA10a
IOUT (mA)
3467 TA10b
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LT3467/LT3467A PACKAGE DESCRIPTION
Package 8-Lead Plastic (3mm 2mm)
(Reference 05-08-1702
0.61 0.05 SIDES) 0.70 0.05 2.55 0.05 1.15 0.05 PACKAGE OUTLINE 0.25 0.05 0.50 2.20 0.05 SIDES) RECOMMENDED SOLDER PITCH DIMENSIONS NOTE: DRAWING CONFORMS VERSION (WECD-1) JEDEC PACKAGE OUTLINE M0-229 DRAWING SCALE DIMENSIONS MILLIMETERS DIMENSIONS EXPOSED BOTTOM PACKAGE INCLUDE MOLD FLASH. MOLD FLASH, PRESENT, SHALL EXCEED 0.15mm SIDE EXPOSED SHALL SOLDER PLATED SHADED AREA ONLY REFERENCE LOCATION BOTTOM PACKAGE MARK (SEE NOTE 2.00 0.10 SIDES) 0.56 0.05 SIDES) 0.75 0.05 0.25 0.20 0.25 CHAMFER
(DDB8) 0905
3.00 0.10 SIDES)
0.05
0.115
0.40
0.10
0.200
0.05 2.15 0.05 SIDES)
0.50
0.05
BOTTOM VIEW-EXPOSED
Package 6-Lead Plastic TSOT-23
(Reference 05-08-1636)
0.62 0.95 2.90 (NOTE
1.22
3.85 2.62
2.80
1.50 1.75 (NOTE
RECOMMENDED SOLDER LAYOUT CALCULATOR
0.95
0.30 0.45 PLCS (NOTE
0.80 0.90 0.20 1.00 DATUM 0.01 0.10
0.30 0.50
NOTE: DIMENSIONS MILLIMETERS DRAWING SCALE DIMENSIONS INCLUSIVE PLATING DIMENSIONS EXCLUSIVE MOLD FLASH METAL BURR MOLD FLASH SHALL EXCEED 0.254mm JEDEC PACKAGE REFERENCE MO-193
0.09 0.20 (NOTE
1.90
TSOT-23 1005
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Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LT3467/LT3467A TYPICAL APPLICATIONS
4.7H 2.2F SHDN 115k
Efficiency
VOUT 270mA 22pF EFFICIENCY IOUT (mA)
SHDN LT3467
13.3k
0.047F X7R, 6.3V X7R, PHILIPS PMEG 2010 SUMIDA CR43-4R7 *OPTIONAL
3467 F08a
Figure 12V, 270mA Step-Up Converter
3.3H 115k 12pF 13.3k VOUT 260mA
3467 F08b
Efficiency
EFFICIENCY IOUT (mA)
3467 F09b
4.7F
SHDN LT3467A
0.047F
X7R, 6.3V X7R, PHILIPS PMEG 2010 SUMIDA CDRH4D18-3R3
3467 F09a
Figure 12V, 260mA Step-Up Converter
RELATED PARTS
PART NUMBER LT1615/LT1615-1 LT1618 LTC1700 LTC1871 LT1930/LT1930A LT1946/LT1946A LT1961 LTC3400/ LTC3400B LTC3401 LTC3402 LT3464 DESCRIPTION 300mA/80mA (ISW), High Efficiency Step-Up DC/DC Converter 1.5A (ISW), 1.25MHz, High Efficiency Step-Up DC/DC Converter RSENSETM, 530kHz, Synchronous Step-Up DC/DC Controller Wide Input Range, 1MHz, RSENSE Current Mode Boost, Flyback SEPIC Controller (ISW), 1.2MHz/2.2MHz, High Efficiency Step-Up DC/DC Converter 1.5A (ISW), 1.2MHz/2.7MHz, High Efficiency Step-Up DC/DC Converter with Soft-Start 1.5A (ISW), 1.25MHz, High Efficiency Step-Up DC/DC Converter 600mA (ISW), 1.2MHz, Synchronous Step-Up DC/DC Converter (ISW), 3MHz, Synchronous Step-Up DC/DC Converter (ISW), 3MHz, Synchronous Step-Up DC/DC Converter COMMENTS VIN: 15V, VOUT(MAX) 34V, 20A, ThinSOT Package Efficiency, VIN: 1.6V 18V, VOUT(MAX) 35V, 1.8mA, Package Efficiency, VIN: 0.9V 200A, 10A, Package Efficiency, VIN: 2.5V 36V, 250A, 10A, Package High Efficiency, VIN: 2.6V 16V, VOUT(MAX) 34V, 4.2mA/5.5mA, ThinSOT Package High Efficiency, VIN: 2.45V 16V, VOUT(MAX) 34V, 3.2mA, Package Efficiency, VIN: 25V, VOUT(MAX) 35V, 0.9mA, MS8E Package Efficiency, VIN: 0.85V VOUT(MAX) 19A/300A, ThinSOT Package Efficiency, VIN: 0.5V VOUT(MAX) 5.5V, 38A, Package Efficiency, VIN: 0.5V VOUT(MAX) 5.5V, 38A, Package VIN: 2.3V 10V, VOUT(MAX) 34V, 25A, ThinSOT Package
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85mA (ISW), High Efficiency Step-Up DC/DC Converter with Integrated Schottky Disconnect RSENSE trademark Linear Technology Corporation.
Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
1208 PRINTED
1630 McCarthy Blvd., Milpitas, 95035-7417
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2003
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