LT3487 Boost Inverting Switching Regulator Bias DESCRIPTIO LT®348
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LT3487 Boost Inverting Switching Regulator Bias DESCRIPTIO
LT®3487 dual channel switching regulator generates positive negative outputs biasing imagers. device delivers 90mA 45mA from lithium-ion cell, providing bias many popular imagers. boost regulator incorporates output disconnect technology eliminate current path from output load that present standard boost configurations. 2MHz switching frequency allows solutions using tiny, profile capacitors inductors generates noise outputs that easy filter. Schottky diodes internal output voltages with resistor channel, reducing external component count. Intelligent soft-start allows sequential soft-start channels with single capacitor. soft-start sequenced such that output ramp negative channel begins after ramp positive channel. Internal sequencing circuitry also disables negative channel until positive channel reached final value, ensuring that outputs always positive. LT3487 available 10-pin package.
Generates 45mA, 90mA from Li-Ion Cell Output Disconnect Sequencing: Positive Output Reaches Regulation Before Negative Channel Begins Switching Internal Schottky Diodes 2MHz Constant Switching Frequency Requires Only Resistor Channel Output Voltages Range: 2.3V Output Voltage Short-Circuit Robust Capacitor Programmable Soft-Start Separate VBAT Allows Separate Sources Power Control Circuitry Available 10-Lead (3mm 3mm) Package
APPLICATIO
Bias Bias OLED Bias ±Rail Generation Amps
Lare registered trademarks Linear Technology Corporation. other trademarks property their respective owners.
TYPICAL APPLICATIO
2.2µF 47pF 15µH VNEG 90mA 22µF 324k RUN/SS 100nF RUN/SS
15µH
10µH
VBAT
EFFICIENCY 549k 4.7µF 100nF VPOS VPOS 45mA 3.6V LOAD CURRENT (mA)
3487 TA01b
LT3487
3487 TA01a
Conversion Efficiency
CHANNEL
CHANNEL VPOS CHANNEL
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LT3487 ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW VBAT VPOS RUN/SS
Voltage VBAT Voltage SWP, Voltage. CAP, VPOS .30V Voltage -32V RUN/SS Voltage Voltage. Voltage -0.2V Maximum Junction Temperature 125°C Operating Temperature Range -40°C 85°C Storage Temperature Range. -65°C 125°C
PACKAGE 10-LEAD (3mm 3mm) PLASTIC 43°C/W, 3°C/W EXPOSED (PIN GND, MUST CONNECTED
ORDER PART NUMBER LT3487EDD
PART MARKING LBXB
Order Options Tape Reel: Lead Free: #PBF Lead Free Tape Reel: #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult Marketing parts specified with wider operating temperature ranges.
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 3.6V, VBAT 3.6V, unless otherwise noted.
PARAMETER Operating Voltage Range Quiescent Current RUN/SS Voltage Threshold (Full Current) RUN/SS Voltage Threshold (Shutdown) RUN/SS Current (Positive Channel) Voltage (Negative Channel) Voltage Voltage Line Regulation Voltage Line Regulation Bias Current Bias Current Threshold (Percent Final Value) Start Negative Channel Switching Frequency Maximum Duty Cycle Positive Channel Switch Current Limit Negative Channel Switch Current Limit Positive Channel VCESAT Negative Channel VCESAT (Note (Note ISWP 400mA ISWN 600mA
ELECTRICAL CHARACTERISTICS
CONDITIONS RUN/SS Switching RUN/SS (Note
UNITS mV/V
1.19
1.23 0.007 0.001 1.27
RUN/SS (Note
24.4 24.4
25.6 25.6 2.15
1.85
1090
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LT3487 ELECTRICAL CHARACTERISTICS
PARAMETER Schottky Forward Drop Schottky Forward Drop Disconnect Disconnect Current Limit VCAP VBAT Disconnect Disconnect Leakage
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 3.6V, VBAT 3.6V, unless otherwise noted.
CONDITIONS ISWP 400mA ISWN 600mA IVPOS 50mA VCAP 15V, VPOS VBAT 3.6V, VPOS ICAP 100µA VBAT 3.6V, 3.6V, VPOS 1045 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 LT3487E guaranteed meet specified performance from 85°C. Specifications over -40°C 85°C operating range assured design, characterization correlation with statistical process controls.
Note Guaranteed design, directly tested. Note Current flows pin. Note Current limit guaranteed design and/or correlation static test. Slope compensation reduces current limit higher duty cycle.
TYPICAL PERFOR CHARACTERISTICS
Shutdown Quiescent Current
PERCENTAGE FINAL VOLTAGE
QUIESCENT CURRENT (µA)
TEMPERATURE (°C)
TEMPERATURE (°C)
VFBP
3487
Positive Output Enable Inverter
1.300
Voltage
1.275
1.250
1.225
1.200
TEMPERATURE (°C)
3487
3487
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LT3487 TYPICAL PERFOR CHARACTERISTICS
Voltage
10.0 VFBN (mV) -2.5 -5.0 -7.5 -10.0 TEMPERATURE (°C) 24.0 24.0 24.5 24.5 IFBP (µA) IFBN (µA) 25.0 25.0 25.5 25.5 26.0
Positive Channel Switch VCE(SAT)
NEGATIVE SWITCH SATURATION VOLTAGE (mV) POSITIVE SWITCH SATURATION VOLTAGE (mV)
POSITIVE SCHOTTKY FORWARD CURRENT (mA)
SWITCH CURRENT (mA)
Negative Channel Schottky Characteristic
NEGATIVE SCHOTTKY FORWARD CURRENT (mA) 1000 SCHOTTKY FORWARD DROP (mV)
3487
VCAP VPOS (mV)
ICAP (mA)
3487
Bias Current
26.0
Bias Current
TEMPERATURE (°C)
TEMPERATURE (°C)
3487
3487
Negative Channel Switch VCE(SAT)
Positive Channel Schottky Characteristic
SWITCH CURRENT (mA)
3487
1000 SCHOTTKY FORWARD DROP (mV)
3487
3487
Output Disconnect Voltage Drop (50mA Load)
Maximum Disconnect Current
VCAP VPOS 500mV 25°C
TEMPERATURE (°C)
12.5
3487
VCAP VBAT
3487
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LT3487 TYPICAL PERFOR CHARACTERISTICS
Output Disconnect Current Limit
VCAP VBAT 3.6V VPOS CURRENT LIMITS (mA) 1200 1150 CHANNEL 1100 1050 1000 TEMPERATURE (°C) TEMPERATURE (°C) CHANNEL
CURRENT LIMITS (mA)
CURRENT LIMIT (mA)
Switch Current Limits RUN/SS Voltage Duty Cycle)
1000 CHANNEL CHANNEL IRUN/SS (µA)
RUN/SS CURRENT (µA)
CURRENT LIMITS (mA)
1000 RUN/SS (mV)
UVLO Voltage
VRUN/SS (mV)
UVLO
TEMPERATURE (°C)
3487
Switch Current Limits
1200 1000
Switch Current Limits Duty Cycle
CHANNEL
CHANNEL DUTY CYCLE
3487
3487
RUN/SS Current Shutdown
RUN/SS Current Shutdown
1250
1500
TEMPERATURE (°C)
3487
3487
3487
RUN/SS Shutdown Threshold
TEMPERATURE (°C)
3487
3487
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LT3487 CTIO
(Pin Disconnect-PNP Emitter Positive Schottky Cathode. Acts intermediate positive (boost) output. Connect boost output capacitor this pin. (Pin Switch Schottky Anode Positive Channel. Connect boost inductor this pin. VBAT (Pin Battery Voltage. Connect this supply voltage boost inductor. disconnect drive current returned this pin. disconnect operates until falls 1.2V above VBAT. (Pin Switch Negative (Inverter) Channel. Connect inverter input inductor flying capacitor here. (Pin Anode Internal Schottky Inverter. Connect inverter output inductor flying capacitor here. (Pin Input Supply Pin. used power control circuitry LT3487. This must locally bypassed with type ceramic capacitor. (Pin Feedback Inverter. Connect feedback resistor from this VNEG. Choose according VNEG 25µA RUN/SS (Pin Run/Soft-Start Pin. Connect opendrain transistor. transistor must sink 1.4µA from RUN/SS. Pull RUN/SS below 100mV shut down chip. Connect capacitor from RUN/SS ground program soft-start functionality. soft-start will slowly bring boost channel into regulation then slowly bring inverter. RUN/SS must above 1.6V allow both channels reach full current. soft-start required, this driven with logic signal, RUN/SS voltage must remain below VIN. (Pin Feedback Boost. Connect boost feedback resistor from CAP. Choose according VPOS 1.23 25µA
voltage when regulated.
voltage 1.23V when regulated. VPOS (Pin 10): Output Boost Channel. VPOS collector output disconnect PNP. Connect boost load VPOS. Connect capacitor between VPOS stability. Exposed (Pin 11): GND. directly ground plane through multiple vias under package optimum thermal performance.
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LT3487 BLOCK DIAGRA
49.2k
VBAT
VREF 1.23V 1.4µA 49.2k RAMP GENERATOR 2MHz OSCILLATOR 160mV 1.25V
RUN/SS
VNEG
RAMP GENERATOR VNEG
3487
Figure Block Diagram
VBAT DISCONNECT ANTISAT VBAT VPOS
VBAT
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LT3487 APPLICATIO ATIO
Operation LT3487 uses constant frequency, current mode control scheme provide excellent line load regulation. Operation best understood referring Block Diagram Figure start each oscillator cycle, latch set, 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 1.23V. this manner, error amplifier sets correct peak current level keep output regulation. error amplifier's output increases, more current delivered output; decreases, less current delivered. second channel inverting converter. basic operation same positive channel. latch also start each oscillator cycle. power switch turned same time turns based feedback loop, which consists error amplifier comparator reference voltage this negative channel ground. Voltage clamps (not shown) enforce current limit. Switching waveforms with typical load conditions shown Figure used output disconnect pass transistor. disconnects load from input during shutdown. anti-sat driver keeps edge saturation
VSWP 20V/DIV 100mA/DIV VSWN 20V/DIV ISWN 100mA/DIV 3.6V VPOS 15V, 25mA VNEG -8V, 50mA 200ns/DIV
3487
Figure Switching Waveforms
long typically 1.2V worst-case 1.6V (cold) above VBAT voltage. drive current output disconnect returned VBAT pin. This allows pass transistor turn when voltage falls less than 1.2V above VBAT. VBAT allows applications which power (inductors internal control circuitry (VIN pin) powered from different sources. Inductor Selection inductor recommended LT3487 boost channel. inverting channel uncoupled inductors, coupled inductors. Small size high efficiency major concerns most LT3487 applications. Inductors with core losses small (copper wire resistance) 2MHz good choices LT3487 applications. inductor should order half switch on-resistance channel. Some inductors this category with small size listed Table
Table Recommended Inductors
PART NUMBER DB318C-A997AS100M CDRH3D18-100 CDRH2D18HP-100 CDRH3D23-100 CDRH2D18/HP-150 CDRH3D18-150 CDRH3D23-150 INDUCTANCE 0.18 0.205 0.245 0.117 0.345 0.301 0.191 CURRENT RATING (mA) MANUFACTURER Toko www. tokoam.com Sumida www.sumida.com
Capacitor Selection small size ceramic capacitors makes them suitable LT3487 applications. types ceramic capacitors recommended because they retain their capacitance over wider voltage temperature ranges than other types such Z5U. input capacitor sufficient most LT3487 applications. output capacitors required stability depend application. typical Li-Ion +15V, application, positive channel requires 4.7F output capacitor negative channel requires least capacitance.
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LT3487 APPLICATIO ATIO
MANUFACTURER Taiyo Yuden Murata Kemet PHONE (408) 573-4150 (814) 237-1431 (408) 986-0424
Table Recommended Ceramic Capacitor Manufacturers
www.t-yuden.com www.murata.com www.kemet.com
Inrush Current LT3487 uses internal Schottky diodes. When supply voltage abruptly applied pin, voltage difference between VCAP generates inrush current flowing from input through inductor internal Schottky diode charge boost output capacitor inverting channel, there similar inrush current flowing from input through inductor path, charging flying capacitor returning through internal Schottky diode maximum current Schottky diodes LT3487 sustain selection inductor capacitor values should ensure that peak inrush current below peak inrush current calculated follows: arctan
Table Recommended Schottky Diodes
PART NUMBER PMEG2010AEB FORWARD CURRENT (mA) 1000 FORWARD VOLTAGE DROP 0.51 DIODE CAPACITANCE 10V) MANUFACTURER Philips www.semiconductors. philips.com Central Semiconductor www.centralsemi.com ROHM www.rohm.com Zetex www.zetex.com
CMDSH2-3 RSX051VA-30 ZHCS400
where inductance, resistance inductor output capacitance. inductors, which usually case this application, peak inrush current simplified follows: Table gives inrush peak currents some component selections. Note that inrush current concern input voltage rises slowly.
Table Inrush Peak Current
0.18 0.235 0.18 0.245 0.345
1.44 1.06 0.979 0.958 0.704
External Diode Selection stated previously, LT3487 internal Schottky diodes. Schottky diode, sufficient most step-up applications. However, high current inverter applications, properly selected external Schottky diode parallel with improve efficiency. external diode selection, both forward voltage drop diode capacitance need considered. Schottky diodes rated higher current usually have lower forward voltage drops larger capacitance, which cause significant switching losses 2MHz switching frequency. Some recommended Schottky diodes listed Table
0.49 0.35 0.425
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LT3487 APPLICATIO ATIO
Setting Output Voltages LT3487 accurate internal feedback resistor that trimmed feedback currents 25µA each channel. Only resistor needed output voltage each channel. output voltage according following formulas: 1.23 25µA VNEG 25µA
order maintain accuracy, high precision resistors preferred recommended). Soft-Start LT3487 single soft-start control both channels. RUN/SS 1.4A current source. soft-start ramp programmed connecting capacitor from RUN/SS ground. open-drain transistor should used pull shut down LT3487. Once transistor stops sinking 1.4A, capacitor begins charge. chip starts when RUN/SS charges 160mV. node voltage follows RUN/SS voltage continues ramp ensure slow start-up positive channel. node follows ramp voltage, down VBE. This ensures that negative channel starts after positive, still slow ramping output avoid large start-up currents.
VRUN/SS 2V/DIV 1A/DIV VPOS 10V/DIV VNEG 10V/DIV 500µs/DIV
3487 F03a
VRUN/SS 2V/DIV 500mA/DIV VPOS 10V/DIV VNEG 10V/DIV 2ms/DIV
3487 F03b
Figure VRUN/SS, VPOS, VNEG, with Soft-Start Capacitor
Figure VRUN/SS, VPOS, VNEG, with 10nF Soft-Start Capacitor
Start Sequencing LT3487 also internal sequencing circuitry that inhibits negative channel from operating until feedback voltage boost channel reaches about 1.1V (87% final voltage), ensuring that outputs always positive. There ways which negative channel start depending size soft-start capacitor. there soft-start capacitor, very small capacitor, then negative channel will start when positive output reaches final value. large enough soft-start capacitor used, then RUN/SS voltage will continue clamp negative channel past point where positive channel regulation. Figure shows start-up sequencing without soft-start, with small soft-start capacitor, large soft-start capacitor. Output Disconnect output disconnect uses transistor with circuitry that varies base current such that transistor consistently edge saturation, thus yielding best compromise between VCE(SAT) quiescent current. remain stable, this circuit requires bypass capacitor connected between VPOS between VPOS ground. ceramic capacitor with value least 0.1F good choice. Figure shows that support load currents 50mA with less than 210mV. disconnect transistor current limited provide maximum 155mA short circuit.
VRUN/SS 2V/DIV 200mA/DIV VPOS 10V/DIV VNEG 10V/DIV 10ms/DIV
3487 F03c
Figure VRUN/SS, VPOS, VNEG, with 100nF Soft-Start Capacitor
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LT3487 APPLICATIO ATIO
Choosing Feedback Node positive channel feedback resistor, connected VPOS (see Figure Regulating VPOS eliminates output offset resulting from voltage drop across output disconnect. However, case short-circuit fault VPOS pin, LT3487 will switch continuously because low. While operating this open-loop condition, rising voltage limited only current limit output disconnect. Given worst-case parameters this voltage reach Li-Ion application. Care must taken high applications when regulating from VPOS pin. When short-circuit removed, VPOS will bounce voltage pin, potentially exceeding programmed output voltage until
DISCONNECT SATURATION VOLTAGE (mV) DISCONNECT CURRENT (mA)
2400
Figure Output Disconnect
VBAT
LT3487 RUN/SS VPOS VPOS
Figure Feedback Connection Using VPOS Pins
3487f
capacitor voltages fall back into regulation. While this harmless LT3487, this should considered context external circuitry short-circuit events expected. Regulating ensures that voltage VPOS never exceeds output voltage after short-circuit event. However, this setup does compensate voltage drop across output disconnect, resulting output voltage that slightly lower than voltage feedback resistor. This voltage drop (VDISC) accounted when using feedback node setting output voltage according following formula (using VDISC from Figure VBAT VBAT innovation LT3487 that allows output disconnect operation wide range applications. VBAT allows part stay until less than 1.2V above VBAT. This ensures that positive bias doesn't fall before negative bias discharges. some applications useful power inductors from different source than VIN. this case, connect VBAT source powering inductors allow proper operation disconnect. example, automotive system there already buck regulator producing 3.3V from battery. LT3487 enables user power from 3.3V rail, power VBAT VPOS VDISC 1.23 25µA
LT3487 VBAT RUN/SS
3487
VPOS
VPOS
LT3487 APPLICATIO ATIO
inductors directly from battery higher efficiency. When part goes into shutdown, output load isolated from source soon node falls below VBAT plus 1.2V (13.2V this case). VBAT also useful system using supply (such 2-cell alkaline battery), below operating range LT3487. boost converter designed voltage operation provide 3.3V LT3487 pin, while inductors VBAT still powered from supply. shutdown, 3.3V supply will turn off, output disconnect will still decouple output load soon falls below 3.2V
VBAT
VNEG
Figure Recommended Component Placement
Board Layout Consideration with switching regulators, careful attention must paid board layout component placement. maximize efficiency, switch rise fall times made short possible. prevent electromagnetic interference (EMI) problems, proper layout high frequency switching path essential. voltage signals pins have rise fall times Minimize length area traces connected pins always ground plane under switching regulator minimize interplane coupling. Recommended component placement shown Figure
VPOS
3487
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LT3487 TYPICAL APPLICATIO
+15V Boost Inverting Bias
15µH 2.2µF 47pF 10µH LT3487 15µH VNEG 90mA 22µF 4.7µF 324k RUN/SS 100nF RUN/SS
3487 TA02a
VBAT
549k 100nF
VPOS
VPOS 45mA
TAIYO YUDEN EMK212BJ105MG TAIYO YUDEN TMK212BJ225MG TAIYO YUDEN TMK325BJ226MM TAIYO YUDEN TMK316BJ475ML-TR TOKO DB318C-A997AS-100M SUMIDA CDRH2D18/HP-150NC
VPOS Load Step Response
VNEG 20mV/DIV AC-COUPLED
VNEG Load Step Response
VPOS 100mV/DIV AC-COUPLED IPOS 45mA 15mA
-50mA INEG -90mA
3.6V
100µs/DIV
3487 TA02b
3.6V
100µs/DIV
3487 TA02c
positive channel's response stable, slightly underdamped. phase lead capacitor (C8) added provide more ideal phase margin.
VPOS Load Step Response (with Phase Lead Capacitor)
10pF
3487 TA02e
VPOS 100mV/DIV AC-COUPLED 549k IPOS 45mA 15mA
3.6V
100µs/DIV
3487 TA02d
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LT3487 TYPICAL APPLICATIO
+15V Bias
15µH 2.2µF 33pF 10µH
2.7V
15µH VNEG 80mA 22µF
TAIYO YUDEN EMK212BJ105MG TAIYO YUDEN EMK212BJ225MD-TR TAIYO YUDEN TMK325BJ226MM TAIYO YUDEN TMK316BJ475ML-TR TOKO DB318C-A997AS-100M SUMIDA CDRH2D18/HP-150NC
VNEG 90mA 10µF
VBAT
549k 4.7µF
LT3487
15pF
100nF
324k RUN/SS 100nF RUN/SS
3487 TA03
VPOS
VPOS 40mA
+15V Boost Charge Pump Bias
15µH 2.2µF 10µH
VBAT
549k 4.7µF
LT3487 20pF
100nF
324k RUN/SS 100nF RUN/SS
3487 TA04
VPOS
VPOS 45mA
TAIYO YUDEN EMK212BJ105MG TAIYO YUDEN TMK212BJ225MG TAIYO YUDEN EMK316BJ106ML TAIYO YUDEN TMK316BJ475ML-TR PHILIPS PMEG2010AEB TOKO DB318C-A997AS-100M SUMIDA CDRH2D18/HP-150NC
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LT3487 PACKAGE DESCRIPTIO
Package 10-Lead Plastic (3mm 3mm)
(Reference 05-08-1699)
0.675 ±0.05 PACKAGE OUTLINE 0.25 0.05 0.50 2.38 ±0.05 SIDES) RECOMMENDED SOLDER PITCH DIMENSIONS 0.115 0.38 0.10 3.00 ±0.10 SIDES) MARK (SEE NOTE 0.200 0.75 ±0.05 2.38 ±0.10 SIDES) BOTTOM VIEW-EXPOSED 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 1.65 0.10 SIDES)
(DD10) 1103
3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 SIDES)
0.25 0.05 0.50
0.00 0.05
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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.
LT3487 TYPICAL APPLICATIO
+24V -16V Bias
22µH 2.2µF 33pF 15µH LT3487 22µH VNEG -16V 26mA 22µF 10µF 640k RUN/SS 100nF RUN/SS
3487 TA05
VBAT
15pF 931k 100nF
VPOS
VPOS 24mA
TAIYO YUDEN EMK212BJ105MG TAIYO YUDEN TMK212BJ225MG TAIYO YUDEN TMK325BJ226MM TAIYO YUDEN TMK316BJ106KL-T SUMIDA CDRH2D18/HP-150NC TOKO D53LC-A915AY-220M
RELATED PARTS
PART NUMBER LT1944/LT1944-1 LT1945 LT1947 LTC®3450 LT3463/LT3463A LT3471 LT3472/LT3472A DESCRIPTION Dual Output 350mA/100mA ISW, Constant Off-Time, High Efficiency DC/DC Converter Dual Output, Boost/Inverter, 350mA ISW, Constant Off-Time, High Efficiency DC/DC Converter Triple Output, 3MHz, High Efficiency DC/DC Converter Triple Output, 550kHz, High Efficiency DC/DC Converter Dual Output, Boost/Inverter, 250mA ISW, Constant Off-Time, High Efficiency DC/DC Converter with Integrated Schottkys Dual Output, Boost/Inverter, 1.3A ISW, 1.2MHz, High Efficiency DC/DC Converter Dual Output, Boost/Inverter, 350mA/400mA ISW, 1.2MHz, High Efficiency DC/DC Converter with Integrated Schottkys COMMENTS VIN: 1.2V 15V, VOUT(MAX) 34V, 20µA, 1µA, 10-Lead Package VIN: 1.2V 15V, VOUT(MAX) ±34V, 40µA, 1µA, 10-Lead Package VIN: 2.6V VOUT(MAX) ±34V, 9.5mA, 1µA, 10-Lead Package VIN: 1.4V 4.6V, VOUT(MAX) ±15V, 75µA, 2µA, Package VIN: 2.2V 16V, VOUT(MAX) ±40V, 2.8mA, 1µA, Package VIN: 2.4V 16V, VOUT(MAX) ±40V, 2.5mA, 1µA, Package VIN: 2.3V 15V, VOUT(MAX) ±40V, 40µA, 1µA, Package
3487f
Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
0406 PRINTED
1630 McCarthy Blvd., Milpitas, 95035-7417
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2006
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