LT®3471 dual switching regulator combines 42V, 1.3A switches with erro
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LT3471 Dual 1.3A, 1.2MHz Boost/Inverter DESCRIPTION
LT®3471 dual switching regulator combines 42V, 1.3A switches with error amplifiers that sense ground providing boost inverting capability. VCESAT bipolar switches enable device deliver high current outputs small footprint. LT3471 switches 1.2MHz, allowing tiny, cost profile inductors capacitors. High inrush current start-up eliminated using programmable soft-start function, where external sets current ramp rate. constant frequency current mode architecture results low, predictable output noise that easy filter. LT3471 switches rated 42V, making device ideal boost converters ±40V well SEPIC flyback designs. Each channel generate 630mA from 3.3V supply, 510mA from four alkaline cells SEPIC design. device configured boosts, boost inverter inverters. LT3471 available profile (0.75mm) 10-lead package.
Lare registered trademarks Linear Technology Corporation. other trademarks property their respective owners.
1.2MHz Switching Frequency VCESAT Switches: 330mV 1.3A High Output Voltage: Wide Input Range: 2.4V Inverting Capability 630mA from 3.3V Input 320mA from Input -12V 200mA from Input Uses Tiny Surface Mount Components Shutdown Current: Profile (0.75mm) 10-Lead Package
APPLICATIONS
Organic Power Supply Digital Cameras White Power Supply Cellular Phones Medical Diagnostic Equipment Local ±12V Supply TFT-LCD Bias Supply xDSL Power Supply
TYPICAL APPLICATION
OLED Driver
3.3V CONTROL 4.7k 0.33F 2.2H 90.9k SHDN/SS1 FB1N FB1P VREF CONTROL FB2N 4.7k 0.33F SHDN/SS2 FB2P
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4.7F
VOUT1 350mA
OLED Driver Efficiency
EFFICIENCY
VOUT1
0.1F
VOUT1
LT3471
105k
75pF VOUT2 250mA
IOUT (mA)
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LT3471 ABSOLUTE MAXIMUM RATINGS
(Note
CONFIGURATION
VIEW FB1N FB1P VREF FB2P FB2N SHDN/SS1 SHDN/SS2
Voltage .16V SW1, Voltage -0.4V FB1N, FB1P FB2N, FB2P Voltage. 1.5V SHDN/SS1, SHDN/SS2 Voltage VREF Voltage.1.5V Maximum Junction Temperature 125°C Operating Temperature Range (Note 40°C 85°C Storage Temperature Range.- 65°C 125°C
PACKAGE 10-LEAD (3mm 3mm) PLASTIC TJMAX 125°C, 43°C/ 3°C/W EXPOSED (PIN MUST SOLDERED
ORDER INFORMATION
LEAD FREE FINISH LT3471EDD#PBF LEAD BASED FINISH LT3471EDD TAPE REEL LT3471EDD#TRPBF TAPE REEL LT3471EDD#TR PART MARKING LBHM PART MARKING LBHM PACKAGE DESCRIPTION 10-Lead (3mm 3mm) Plastic PACKAGE DESCRIPTION 10-Lead (3mm 3mm) Plastic TEMPERATURE RANGE -40°C 85°C TEMPERATURE RANGE -40°C 85°C
Consult Marketing parts specified with wider operating temperature ranges. more information lead free part marking, http://www.linear.com/leadfree/ This product only offered trays. more information
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VSHDN unless otherwise noted.
PARAMETER Minimum Operating Voltage Reference Voltage Reference Voltage Current Limit Reference Voltage Load Regulation Reference Voltage Line Regulation Error Amplifier Offset Bias Current Quiescent Current Quiescent Current Shutdown Switching Frequency Maximum Duty Cycle Minimum Duty Cycle Switch Current Limit Switch VCESAT Switch Leakage Current SHDN/SS Input Voltage High Minimum Duty Cycle Maximum Duty Cycle (Note 0.5A (Note
ELECTRICAL CHARACTERISTICS
CONDITIONS
0.991 0.987
1.000 0.03
1.009 1.013 0.08
UNITS %/100A
(Note IREF 100A (Note 2.6V Transition from Switching Switching, VFBP VFBN (Note VSHDN 1.8V, Switching VSHDN 0.3V,
0.01 2.05 1.45 0.01
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LT3471 ELECTRICAL CHARACTERISTICS
PARAMETER SHDN Input Voltage SHDN Bias Current CONDITIONS Quiescent Current VSHDN VSHDN
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VSHDN unless otherwise noted.
UNITS
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 LT3471E guaranteed meet performance specifications from 70°C. Specifications over -40°C 85°C operating
temperature range assured design, characterization correlation with statistical process controls. Note Current flows pin. Note Typical Performance Characteristics guaranteed current limit duty cycle. Note VCESAT 100% tested wafer level only.
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current Temperature
1.010
VREF Voltage Temperature
VREF Voltage VREF Current
QUIESCENT CURRENT (mA)
1.005 VREF VREF VOLTAGE 100mV/DIV
1.000
0.995
VREF CURRENT 200A/DIV
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TEMPERATURE (°C)
0.990
TEMPERATURE (°C)
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SHDN/SS Current SHDN/SS Voltage
3.3V CURRENT LIMIT SHDN/SS CURRENT 20V/DIV VSHDN/SS
Current Limit Duty Cycle
25°C TYPICAL VCESAT (mV) GUARANTEED
Switch Saturation Voltage Switch Current
90°C 25°C
SHDN/SS VOLTAGE 1V/DIV
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DUTY CYCLE
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CURRENT
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LT3471 TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency Temperature
1.50 1.45 1.40 FREQUENCY (MHz) 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 TEMPERATURE (°C) SWITCH CURRENT VSHDN/SS
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Peak Switch Current SHDN/SS Voltage
25°C ISUPPLY 1A/DIV VOUT1 2V/DIV VOUT2 5V/DIV CONTROL 5V/DIV
Start-Up Waveform (Figure Circuit)
0.5ms/DIV
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FUNCTIONS
FB1N (Pin Negative Feedback Switcher Connect resistive divider here. Minimize trace area FB1N. VOUT VFB1P(1 R1/R2), connect ground inverting topologies. FB1P (Pin Positive Feedback Switcher Connect either VREF divided down version VREF, connect resistive divider inverting topologies. VREF (Pin 1.00V Reference Pin. supply current. pull this high. Must locally bypassed with less than 0.01F more than 0.1F ceramic capacitor recommended. this positive feedback reference connect resistor divider here smaller reference voltage. FB2P (Pin Same FB1P Switcher FB2N (Pin Same FB1N Switcher (Pin Switch Switcher (Collector internal power switch). Connect inductor/diode here minimize metal trace area connected this minimize EMI. SHDN/SS2 (Pin Shutdown Soft-Start Pin. 1.8V more enable device. Ground shut down. Softstart function provided when voltage this ramped slowly 1.8V with external circuit. (Pin Input Supply. Must locally bypassed. SHDN/SS1 (Pin Same SHDN/SS2 Switcher Note: taking either SHDN/SS high will enable part. Each switcher individually enabled with respective SHDN/SS pin. (Pin 10): Same Switcher Exposed (Pin 11): Ground. Connect directly local ground plane. This ground plane also serves heat sink optimal thermal performance.
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LT3471 BLOCK DIAGRAM
FB1P
DRIVER
FB1N
1.00V REFERENCE
VREF
RAMP GENERATOR
SHDN/SS1
LEVEL SHIFTER
FB2P
DRIVER
FB2N
LEVEL SHIFTER
SHDN/SS2
RAMP GENERATOR
1.2MHz OSCILLATOR
Figure Block Diagram
OPERATION
LT3471 uses constant frequency, current mode control scheme provide excellent line load regulation. Refer Block Diagram. start each oscillator cycle, latch set, which turns power switch, (Q2). voltage proportional switch current added stabilizing ramp resulting into positive terminal comparator (A4). When this voltage exceeds level negative input (A4), latch reset, turning power switch (Q2). level negative input (A4) error amplifier (A3) simply amplified version difference between negative feedback voltage positive feedback voltage, usually tied reference voltage VREG. 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. Each switcher functions independently they share same oscillator thus switchers always phase. Enabling part done taking either SHDN/SS above 1.8V. Disabling part done grounding both SHDN/SS pins. soft-start feature LT3471 allows clean start-up conditions limiting amount voltage rise output comparator which turn limits peak switching current. soft-start feature each switcher enabled slowly ramping that switcher's SHDN/SS pin, using network, example. Typical resistor capacitor values 0.33F 4.7k, allowing start-up time order milliseconds. LT3471 current limit circuit shown Block Diagram. switch current constantly monitored allowed exceed maximum switch current (typically 1.6A). switch
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0.01
0.01
LT3471 OPERATION
current reaches this value, latch reset regardless state comparator (A4). Also shown Block Diagram thermal shutdown circuit. temperature part exceeds approximately 160°C, both latches reset regardless state comparators current limit thermal shutdown circuits protect power switch well external components connected LT3471.
APPLICATIONS INFORMATION
Duty Cycle typical maximum duty cycle LT3471 94%. duty cycle given application given VOUT VOUT VCESAT inverting topologies, VFBN tied ground VFBP connected between between VFBP VREF between VFBP VOUT (see Applications section examples). this case: VOUT VREF
Where diode forward voltage drop VCESAT worst case 330mV 1.3A) LT3471 used higher duty cycles, must operated discontinuous conduction mode that actual duty cycle reduced. Setting Output Voltage Setting output voltage depends topology used. normal noninverting boost regulator topologies: VOUT VFBP where VFBN connected between (see Typical Applications section examples). Select values according following equation: VOUT VREF
Select values according following equation: R1=R2 VOUT VREF
good value 15k, which sets current resistor divider chain 1.00V/15k 67A. Switching Frequency Inductor Selection LT3471 switches MHz, allowing small valued inductors used. 4.7H will usually suffice. Choose inductor that handle least 1.4A 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 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 MHz, such ferrite core.
Table Inductor Manufacturers
Sumida Murata (847) 956-0666 (847) 803-6100 (714) 852-2001 www.sumida.com www.tdk.com www.murata.com
good value which sets current resistor divider chain 1.00V/15k 67A. VFBP usually just tied VREF 1.00V, VFBP also tied divided down version VREF some other voltage long absolute maximum ratings feedback pins exceeded (see Absolute Maximum Ratings).
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LT3471 APPLICATIONS INFORMATION
Soft-Start Shutdown Features shut down part, ground both SHDN/SS pins. shut down switcher other one, ground that switcher's SHDN/SS pin. soft-start feature provides limit inrush current drawn from supply upon start-up. soft-start feature either switcher, slowly ramp that switcher's SHDN/SS pin. rate voltage rise output switcher's comparator switcher switcher respectively) tracks rate voltage rise SHDN/SS once SHDN/SS reached about 1.1V. soft-start function will away once voltage SHDN/SS exceeds 1.8V. Peak Switch Current SHDN/SS Voltage graph Typical Performance Characteristics section. rate voltage rise SHDN/SS easily controlled with simple network connected between control signal SHDN/SS pin. Typical values network 4.7k 0.33F, giving start-up times order milliseconds. This time constant adjusted give different start-up times. different values resistance used, keep mind SHDN/SS Current SHDN/SS voltage graph along with Peak Switch Current SHDN/SS Voltage graph, both found Typical Performance Characteristics section. impedance looking into SHDN/SS depends whether SHDN/SS above below VIN. Normally SHDN/SS will driven above VIN, thus impedance looks like 100k series with diode. voltage SHDN/SS above VIN, impedance looks more like series with diode. This 100k impedance have slight effect start-up time choose soft-start network large. Another consideration selecting soft-start time that soft-start feature dominated network capacitor VREF. (See VREF voltage reference section Applications Information details.) soft-start feature particular importance applications where switch will voltage levels higher. these applications, simultaneous presence high current voltage during startup cause overstress condition switch. Therefore, depending input output voltage conditions, higher time constant values necessary improve ruggedness design. 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 LT3471. 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
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. phase lead zero intentionally introduced placing capacitor (CPL) parallel with resistor (R3) between VOUT shown Figure frequency zero determined following equation.
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LT3471 APPLICATIONS INFORMATION
2.2H CONTROL 1.8V RSS1 4.7k CSS1 0.33F RSS2 4.7k CSS2 0.33F LT3471 FB2N SHDN/SS2 FB2P
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33pF 90.9k 0.1F VOUT1 4.7F
SHDN/SS1
FB1N FB1P VREF
2.6V 4.2V Li-Ion CONTROL 1.8V
105k
75pF VOUT2
6.3V CPL: OPTIONAL
SEMICONDUCTOR MBRM-120 SUMIDA CR43-2R2 SUMIDA CDRH4D18-100 SUMIDA CDRH4D18-150
Supply Current Figure During Start-Up without Soft-Start Network
Supply Current Figure During Start-Up with Soft-Start Network
3.3V ISUPPLY 0.5A/DIV
ISUPPLY 0.5A/DIV
3.3V
VOUT1 2V/DIV
VSHDN/SS
VOUT1 2V/DIV
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VSHDN/SS
0.1ms/DIV
0.2ms/DIV
3471 F02c
Figure Li-Ion OLED Driver
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LT3471 APPLICATIONS INFORMATION
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 CPL. Although adequate many applications, phase margin ideal evidenced "bumps" both output voltage inductor current. 33pF capacitor results ideal phase margin, which revealed Figure more damped response less overshoot. VREG VOLTAGE REFERENCE LT3471 bandgap voltage reference that been divided down 1.00V buffered external use. This must bypassed with least 0.01F more than This will ensure stability well reduce noise this pin. buffer built-in current limit least (typically 1.4mA). This only means that this external reference supplemental circuitry, also means that possible provide soft-start feature this used feedback pins error amplifier. Normally soft-start time will dominated time constant discussed soft-start shutdown section. However, because finite current limit buffer VREG pin, will take some time charge bypass capacitor. During this time, voltage VREG will ramp this action provides alternate means soft-starting circuit. largest recommended bypass capacitor used, worst-case (longest) soft-start function that would provided from VREF 1.00V =1.0ms 1.0mA Choose network such that soft-start time longer than this time, choose smaller bypass capacitor VREF (but always larger than 0.01F) that network dominates soft-starting LT3471. voltage VREF also divided down used feedback pins error amplifier. This especially useful driver applications, where current through LEDs using voltage reference across sense resistor chain. Using smaller divided down reference leads less wasted power sense resistor. Typical Applications section example driving applications.
VOUT 200mV/DIV COUPLED
3.3V
0.5A/DIV AC/COUPLED LOAD CURRENT 100mA/DIV AC/COUPLED VSHDN/SS
50s/DIV
Figure Transient Response Figure Step-Up Converter without Phase Lead Capacitor
VOUT 200mV/DIV COUPLED
3.3V
0.5A/DIV AC/COUPLED LOAD CURRENT 100mA/DIV AC/COUPLED VSHDN/SS
50s/DIV
Figure Transient Response Figure Step-Up Converter with 33pF Phase Lead Capacitor
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LT3471 APPLICATIONS INFORMATION
DIODE SELECTION Schottky diode recommended with LT3471. high efficiency, diode with good thermal characteristics high currents should used such Semiconductor MBRM120. This diode. Where switch voltage exceeds 20V, MBRM140, diode. These diodes rated handle average forward current 1.0A. applications where average forward current diode less than 0.5A, Philips PMEG 2005, 3005, 4005 20V, diode, respectively). LAYOUT HINTS high speed operation LT3471 demands careful attention board layout. will advertised performance with careless layout. Figure shows recommended component placement.
CONTROL CSS1 RSS1 CSS2 RSS2 VOUT1 LT3471 VOUT2 CONTROL
Compensation-Theory Like other current mode switching regulators, LT3471 needs compensated stable efficient operation. feedback loops used LT3471: 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
SHDN/SS1
SHDN/SS2
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
FB1N
FB1P
VREF
FB2P
FB2N
Figure Boost Converter Equivalent Model
VOUT1
VOUT2
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Figure Suggested Layout Showing Boost Inverter SW2. Note Separate Ground Returns High Current Paths (Using Multilayer Board)
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1.00V REFERENCE RESR COUT VOUT
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LT3471 APPLICATIONS INFORMATION
From Figure gain, poles zeroes calculated follows: Output Pole: COUT Using circuit Figure example, Table shows parameters used generate Bode plot shown Figure
Table Bode Plot Parameters
Parameter COUT RESR VOUT Value 90.9 Units Comment Application Specific Application Specific Application Specific Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Application Specific Application Specific Adjustable Adjustable Application Specific Adjustable
Error Pole: Error Zero:
GAIN: VOUT Zero: Zero: RESR COUT VOUT
High Frequency Pole: Phase Lead Zero:
Phase Lead Pole: R1+R2
From Figure phase -115° when gain reaches giving phase margin 65°. This more than adequate. crossover frequency 50kHz.
-100 -150 -200 -250 -300 GAIN PHASE 100k FREQUENCY (Hz)
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GAIN (dB)
Current Mode zero right half plane zero which issue feedback control design, manageable with proper external component selection.
PHASE (DEG)
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-350 -400
Figure Bode Plot 3.3V Application
LT3471 TYPICAL APPLICATIONS
Li-Ion OLED Driver
2.2H CONTROL 1.8V RSS1 4.7k CSS1 0.33F RSS2 4.7k CSS2 0.33F LT3471 FB2N SHDN/SS2 FB2P
3471 TA02
33pF 90.9k VCONTROL 0.1F 4.7F VOUT1 500mA WHEN 4.2V 350mA WHEN 3.3V 250mA WHEN 2.6V
SHDN/SS1
FB1N FB1P VREF
2.6V 4.2V Li-Ion CONTROL 1.8V
105k
75pF
6.3V OPTIONAL
SEMICONDUCTOR MBRM-120 SUMIDA CR43-2R2 SUMIDA CDRH4D18-100 SUMIDA CDRH4D18-150
VOUT2 WHEN VCONTROL WHEN VCONTROL -7V, 300mA WHEN 4.2V -7V, 250mA WHEN 3.3V -7V, 200mA WHEN 2.6V
Li-Ion OLED Driver Efficiency
VOUT 4.2V 3.3V 2.6V 4.2V 3.3V 2.6V VOUT
EFFICIENCY
IOUT (mA)
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LT3471 TYPICAL APPLICATIONS
Single Li-Ion Cell Boost Converter
3.3H CONTROL 1.8V RSS1 4.7k CSS1 0.33F 4.7F CSS2 0.33F SHDN/SS2 6.8H LT3471 FB2P FB2N
3471 TA03
100pF 4.99k 0.1F
SHDN/SS1
FB1N FB1P VREF
VOUT1 900mA 4.2V 630mA 3.3V 425mA 2.6V
2.6V 4.2V CONTROL 1.8V RSS2 4.7k
220pF 54.9k 4.99k
VOUT2 300mA 4.2V 210mA 3.3V 145mA 2.6V
C1-C3: 6.3V SEMICONDUCTOR MBRM-120
SUMIDA CR43-3R3 SUMIDA CR43-6R8
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LT3471 TYPICAL APPLICATIONS
Li-Ion White Driver
2.2H CONTROL 1.8V RSS1 4.7k CSS1 0.33F 4.7F CSS2 0.33F SHDN/SS2 LT3471 FB2P FB2N
3471 TA04
0.22F FB1N FB1P VREF 0.1F 90.9k WHITE LEDs IOUT1 20mA
SHDN/SS1
2.6V 4.2V CONTROL 1.8V RSS2 4.7k
4.99 2.2H 6.3V SEMICONDUCTOR MBRM-140 SUMIDA CDRH2D-2R2 WHITE LEDs 0.22F IOUT2 20mA
4.99
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LT3471 TYPICAL APPLICATIONS
Li-Ion 4-Cell Alkaline 3.3V SEPIC
0.1F FB2P SHDN/SS2 6.3V SEMICONDUCTOR MBRM-120 L1-L4: MURATA LQH43CN100K032 56pF 60.4k FB2N
3471 TA05
4.7F
34.8k
CONTROL 1.8V
RSS1 4.7k CSS1 0.33F
SHDN/SS1 FB1N FB1P 4.7F VREF LT3471
56pF
VOUT1 3.3V 640mA 6.5V 550mA 470mA 410mA 3.3V 340mA 2.6V
2.6V 6.5V CONTROL 1.8V RSS2 4.7k
CSS2 0.33F
VOUT2 500mA 6.5V 420mA 360mA 300mA 3.3V 250mA 2.6V
PACKAGE DESCRIPTION
Package 10-Lead Plastic (3mm 3mm)
(Reference 05-08-1698)
0.115 0.675 ±0.05 0.38 0.10
3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 2.38 ±0.05 SIDES) RECOMMENDED SOLDER PITCH DIMENSIONS NOTE: DRAWING MADE JEDEC PACKAGE OUTLINE M0-229 VARIATION (WEED-2). CHECK WEBSITE DATA SHEET CURRENT STATUS VARIATION ASSIGNMENT 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
3.00 ±0.10 SIDES)
1.65 0.10 SIDES)
(DD) 1103
0.200 0.75 ±0.05 2.38 ±0.10 SIDES)
0.25 0.05 0.50
0.00 0.05
BOTTOM VIEW-EXPOSED
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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.
LT3471 TYPICAL APPLICATIONS
±12V Dual Supply Boost/Inverting Converter
CONTROL 1.8V 4.7k 0.33F CONTROL 1.8V 4.7k 0.33F 4.7F SHDN/SS2 LT3471 FB2P FB2N
3471 TA06
56pF 54.9k 4.99k 0.1F 56pF 4.7F
VOUT1 320mA
SHDN/SS1
FB1N FB1P VREF
182k 4.7F
VOUT2 -12V 200mA
6.3V SEMICONDUCTOR MBRM-120
SUMIDA CR43-10 SUMIDA CLS63-10
RELATED PARTS
PART NUMBER LT1611 LT1613 LT1614 LT1615/LT1615-1 LT1617/LT1617-1 LT1930/LT1930A LT1931/LT1931A LT1943 (Quad) LT1945 (Dual) LT1946/LT1946A LT3436 LT3462/LT3462A LT3463/LT3463A LT3464 DESCRIPTION 550mA (ISW 1.4MHz, High Efficiency Micropower Inverting DC/DC Converter 550mA (ISW 1.4MHz, High Efficiency Step-Up DC/DC Converter 750mA (ISW 600kHz, High Efficiency Micropower Inverting DC/DC Converter 300mA/80mA (ISW High Efficiency Step-Up DC/DC Converters 350mA/100mA (ISW High Efficiency Micropower Inverting DC/DC Converters (ISW 1.2MHz/2.2MHz, High Efficiency Step-Up DC/DC Converters (ISW 1.2MHz/2.2MHz High Efficiency Micropower Inverting DC/DC Converters Quad Boost, 2.6A Buck, 2.6A Boost, 0.3A Boost, 0.4A Inverter 1.2MHz DC/DC Converter Dual Output, Boost/Inverter, 350mA (ISW Constant Off-Time, High Efficiency Step-Up DC/DC Converter 1.5A (ISW 1.2MHz/2.7MHz, High Efficiency Step-Up DC/DC Converters (ISW 1MHz, Step-Up DC/DC Converter 300mA (ISW 1.2MHz/2.7MHz, High Efficiency Inverting DC/DC Converters with Integrated Schottkys COMMENTS VIN: 1.1V 10V, VOUT(MAX) -34V, 3mA, ThinSOT Package VIN: 0.9V 10V, VOUT(MAX) 34V, 3mA, ThinSOT Package VIN: 12V, VOUT(MAX) -24V, 1mA, 10A, MS8, Packages 15V, VOUT(MAX) 34V, 20A, ThinSOT Package 1.2V 15V, VOUT(MAX) -34V, 20A, ThinSOT Package VIN: 2.6V 16V, VOUT(MAX) 34V, 4.2mA/5.5mA, ThinSOT Package 2.6V 16V, VOUT(MAX) -34V, 5.8mA, ThinSOT Package 4.5V 22V, VOUT(MAX) 40V, 10A, 35A, TSSOP28E Package 1.2V 15V, VOUT(MAX) ±34V, 40A, 10-Lead Package VIN: 2.45V 16V, VOUT(MAX) 34V, 3.2mA, Package VIN: 25V, VOUT(MAX) 34V, 0.9mA, TSSOP16E Package 2.5V 16V, VOUT(MAX) -38V, 2.9mA, ThinSOT Package
2.3V 15V, VOUT(MAX) ±40V, 40A, Dual Output, Boost/Inverter, 250mA (ISW Constant Off-Time, High Efficiency Step-Up DC/DC Converters with Integrated Schottkys Package 85mA (ISW High Efficiency Step-Up DC/DC Converter with Integrated Schottky Disconnect 2.3V 10V, VOUT(MAX) 34V, 25A, ThinSOT Package
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Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
1008 PRINTED
1630 McCarthy Blvd., Milpitas, 95035-7417
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2004
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