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    LTC4269 Search Results

    LTC4269 Datasheets (12)

    Linear Technology
    Part ECAD Model Manufacturer Description Datasheet Type PDF PDF Size Page count
    LTC4269CDKD-1#PBF
    Linear Technology LTC4269 - IC SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO32, 7 X 4 MM, LEAD FREE, PLASTIC, M0-229, DFN-32, Switching Regulator or Controller Original PDF 397.33KB 44
    LTC4269CDKD-1#TRPBF
    Linear Technology LTC4269 - IC SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO32, 7 X 4 MM, LEAD FREE, PLASTIC, M0-229, DFN-32, Switching Regulator or Controller Original PDF 397.33KB 44
    LTC4269CDKD-2#PBF
    Linear Technology LTC4269 - IC SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32, 7 X 4 MM, LEAD FREE, PLASTIC, M0-229, DFN-32, Switching Regulator or Controller Original PDF 397.33KB 44
    LTC4269CDKD-2#PBF
    Linear Technology PMIC - Power Over Ethernet (PoE) Controllers, Integrated Circuits (ICs), IC POE 802.3AT PD W/REG 32-DFN Original PDF 34
    LTC4269CDKD-2#TRPBF
    Linear Technology LTC4269 - IC SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32, 7 X 4 MM, LEAD FREE, PLASTIC, M0-229, DFN-32, Switching Regulator or Controller Original PDF 397.33KB 44
    LTC4269CDKD-2#TRPBF
    Linear Technology PMIC - Power Over Ethernet (PoE) Controllers, Integrated Circuits (ICs), IC POE 802.3AT PD W/REG 32-DFN Original PDF 34
    LTC4269IDKD-1#PBF
    Linear Technology LTC4269 - IC SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO32, 7 X 4 MM, LEAD FREE, PLASTIC, M0-229, DFN-32, Switching Regulator or Controller Original PDF 397.33KB 44
    LTC4269IDKD-1#TRPBF
    Linear Technology LTC4269 - IC SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO32, 7 X 4 MM, LEAD FREE, PLASTIC, M0-229, DFN-32, Switching Regulator or Controller Original PDF 397.33KB 44
    LTC4269IDKD-2#PBF
    Linear Technology LTC4269 - IC SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32, 7 X 4 MM, LEAD FREE, PLASTIC, M0-229, DFN-32, Switching Regulator or Controller Original PDF 397.33KB 44
    LTC4269IDKD-2#PBF
    Linear Technology PMIC - Power Over Ethernet (PoE) Controllers, Integrated Circuits (ICs), IC POE 802.3AT PD W/REG 32-DFN Original PDF 34
    LTC4269IDKD-2#TRPBF
    Linear Technology LTC4269 - IC SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32, 7 X 4 MM, LEAD FREE, PLASTIC, M0-229, DFN-32, Switching Regulator or Controller Original PDF 397.33KB 44
    LTC4269IDKD-2#TRPBF
    Linear Technology PMIC - Power Over Ethernet (PoE) Controllers, Integrated Circuits (ICs), IC POE 802.3AT PD W/REG 32-DFN Original PDF 34
    SF Impression Pixel

    LTC4269 Price and Stock

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    Analog Devices Inc LTC4269IDKD-1#PBF

    Pd Controller, 60V, Dfn-Ep-32; |Analog Devices, Inc. LTC4269IDKD-1#PBF
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Newark LTC4269IDKD-1#PBF Bulk 48 1
    • 1 $9.71
    • 10 $7.53
    • 100 $6.63
    • 1000 $6.37
    • 10000 $6.37
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    Richardson RFPD LTC4269IDKD-1#PBF 104
    • 1 -
    • 10 -
    • 100 $4.78
    • 1000 $4.78
    • 10000 $4.78
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    Vyrian LTC4269IDKD-1#PBF 9,048
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    Analog Devices Inc LTC4269CDKD-1#PBF

    Pd Controller, 60V, Dfn-Ep-32; |Analog Devices, Inc. LTC4269CDKD-1#PBF
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Newark LTC4269CDKD-1#PBF Bulk 9 1
    • 1 $6.92
    • 10 $5.32
    • 100 $4.67
    • 1000 $4.48
    • 10000 $4.48
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    Richardson RFPD LTC4269CDKD-1#PBF 156
    • 1 -
    • 10 -
    • 100 $4.15
    • 1000 $4.15
    • 10000 $4.15
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    Vyrian LTC4269CDKD-1#PBF 10,675
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    Analog Devices Inc LTC4269IDKD-1#TRPBF

    Pd Controller, 60V, Dfn-Ep-32; |Analog Devices, Inc. LTC4269IDKD-1#TRPBF
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Newark () LTC4269IDKD-1#TRPBF Cut Tape 1
    • 1 $7.88
    • 10 $7.88
    • 100 $5.15
    • 1000 $4.92
    • 10000 $4.92
    Buy Now
    LTC4269IDKD-1#TRPBF Tape & Reel 10
    • 1 $7.88
    • 10 $7.88
    • 100 $5.15
    • 1000 $4.92
    • 10000 $4.92
    Buy Now
    Richardson RFPD LTC4269IDKD-1#TRPBF 2,500
    • 1 -
    • 10 -
    • 100 $4.78
    • 1000 $4.78
    • 10000 $4.78
    Buy Now
    Vyrian LTC4269IDKD-1#TRPBF 10,962
    • 1 -
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    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Analog Devices Inc LTC4269CDKD-1#TRPBF

    Pd Controller, 60V, Dfn-Ep-32; |Analog Devices, Inc. LTC4269CDKD-1#TRPBF
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Newark () LTC4269CDKD-1#TRPBF Tape & Reel 10
    • 1 $6.92
    • 10 $6.92
    • 100 $4.49
    • 1000 $4.26
    • 10000 $4.26
    Buy Now
    LTC4269CDKD-1#TRPBF Cut Tape 1
    • 1 $6.92
    • 10 $6.92
    • 100 $4.49
    • 1000 $4.26
    • 10000 $4.26
    Buy Now
    Richardson RFPD LTC4269CDKD-1#TRPBF 2,500
    • 1 -
    • 10 -
    • 100 $4.15
    • 1000 $4.15
    • 10000 $4.15
    Buy Now
    Vyrian LTC4269CDKD-1#TRPBF 6,167
    • 1 -
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    • 100 -
    • 1000 -
    • 10000 -
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    Linear Technology LTC4269IDKD-1#TRPBF

    SWITCHING CONTROLLER, CURRENT-MODE, 110KHZ SWITCHING FREQ-MAX, CMOS, PDSO32
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    Quest Components LTC4269IDKD-1#TRPBF 15
    • 1 $8.41
    • 10 $4.21
    • 100 $4.21
    • 1000 $4.21
    • 10000 $4.21
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    Win Source Electronics LTC4269IDKD-1#TRPBF 470
    • 1 -
    • 10 $14.55
    • 100 $11.82
    • 1000 $11.82
    • 10000 $11.82
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    LTC4269 Datasheets Context Search

    Catalog Datasheet Type Document Tags PDF

    LTC436

    Contextual Info: RELIABILITY DATA LTC2938 / LTC2939 / LTC4224 / LTC4268 / LTC4269 / LTC4278 / LTC4360/61/62 7/7/2011 • OPERATING LIFE TEST PACKAGE TYPE SAMPLE SIZE OLDEST DATE CODE SOIC/SOT/MSOP QFN/DFN NEWEST DATE CODE 464 0804 387 0726 851 • HIGHLY ACCELERATED STRESS TEST AT +131°C/85%RH


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    ltc2938ltc2939ltc4224ltc4268+6ltc4269ltc4278ltc4360/61/62pa083800-03-6209bltc436 PDF

    340 opto isolator

    Abstract: adapter 12v,2A 5V,2A kelvin 1102 HD01 LTC4269-1 LTC4269C-1 LTC4269CDKD-1 LTC4269I-1 LTC4269IDKD-1 PA1558NL
    Contextual Info: LTC4269-1 IEEE 802.3at PD with Synchronous No-Opto Flyback Controller DESCRIPTION FEATURES n n n n n n n n n n n n The LTC 4269-1 is an integrated Powered Device PD controller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. The


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    ltc4269-1ltc4268-1750maltc4269-2+12100khz500khz42691fb340 opto isolatoradapter 12v,2a 5v,2akelvin 1102hd01ltc4269c-1ltc4269cdkd-1ltc4269i-1ltc4269idkd-1pa1558nl PDF

    ETH1-230L

    Abstract: LTC4269CDKD-2 window regulator LTC4269-2 LTC4269C-2 LTC4269I-2 LTC4269IDKD-2 TLV431 mps 0522 step up DC DC 5v converter out 12V
    Contextual Info: LTC4269-2 IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support Description Features n n n n n n n n n n n 25.5W IEEE 802.3at Compliant Type-2 PD PoE+ 2-Event Classification IEEE 802.3at High Power Available Indicator Integrated State-of-the-Art Synchronous Forward


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    ltc4269-2100khz500khz200khz+15300khzltc4268-1750ma50khz250khzltc4269-1eth1-230lltc4269cdkd-2window regulatorltc4269c-2ltc4269i-2ltc4269idkd-2tlv431mps 0522step up dc dc 5v converter out 12v PDF

    LTC4269IDKD-1

    Abstract: 2A Step Up Switching voltage Regulator
    Contextual Info: QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1335B-C HIGH POWER, HIGH EFFICIENCY POE PD INTERFACE WITH INTEGRATED SWITCHING REGULATOR LTC4269IDKD-1 DESCRIPTION Demonstration circuit 1335B-C is a high-power supply featuring the LTC 4269IDKD-1. This board acts as an IEEE 802.3at compliant, high


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    1335b-cltc4269idkd-14269idkd-1dc1366+4ieee80248vport50vport2a step up switching voltage regulator PDF

    K1A 494

    Contextual Info: LTC4269-1 IEEE 802.3at PD with Synchronous No-Opto Flyback Controller DESCRIPTION FEATURES n n n n n n n n n n n n 25.5W IEEE 802.3at Compliant Type 2 PD Integrated State-of-the-Art Synchronous Flyback Controller – Isolated Power Supply Efficiency >92%


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    ltc4269-1ltc4268-1750maltc4269-2+4100khz500khz42691fbk1a 494 PDF

    LTC4269IDKD-2

    Abstract: D1215 DC1366A "power sourcing equipment"
    Contextual Info: QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1351A SINGLE OUTPUT, HIGH POWER, HIGH EFFICIENCY POE LTC4269IDKD-2 DESCRIPTION Demonstration circuit 1351A is a high-power supply featuring the LTC 4269IDKD-2. This board acts as an IEEE 802.3at compliant, high power Power-overEthernet PoE , Powered Device (PD) and connects


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    ltc4269idkd-24269idkd-2dc1366aieee802+437vport48vportd1215power sourcing equipment PDF

    IEEE 802.3at PoE Powered Device Controllers

    Abstract: LTC4269-1 LTC4259A QFN-38 LTC4274 LTC4269 LTC4278 LTC4258 LTC4259A-1 LTC4266
    Contextual Info: PoE+ for the Power Hungry PSE PD RETURN SPARE PAIR VDD Tx Rx DATA PAIR LTC4266 PSE CONTROLLER Rx Tx VPORTP RCLASS DATA PAIR LTC4269 VEE PD CONTROLLER/SWITCHER SENSE GATE VOUT VPORTN SPARE PAIR – 54V 0.25 OPTIONAL AUXILIARY POWER Linear Technology now offers a family of Power over Ethernet interface controllers for emerging PoE+ applications, including higher


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    ltc4266ltc4269ltc4274ltc4265+9ltc4278dfn-32ltc4269-2ieee 802.3at poe powered device controllersltc4269-1ltc4259aqfn-38ltc4258ltc4259a-1 PDF

    ETH1-230LD

    Abstract: LTC3825 110 volt ac transformer less power supply 90v ltc4266 application LTC4269-2 LTC4269C-2 LTC4269CDKD-2 LTC4269I-2 LTC4269IDKD-2 TLV431
    Contextual Info: LTC4269-2 IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support DESCRIPTION FEATURES n n n n n n n n n n n 25.5W IEEE 802.3at Compliant Type-2 PD PoE+ 2-Event Classification IEEE 802.3at High Power Available Indicator Integrated State-of-the-Art Synchronous Forward


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    ltc4269-2100khz500khzltc4268-1+13750ma50khz250khzltc4269-1eth1-230ldltc3825110 volt ac transformer less power supply 90vltc4266 applicationltc4269c-2ltc4269cdkd-2ltc4269i-2ltc4269idkd-2tlv431 PDF

    LT42691

    Abstract: "power sourcing equipment" 90W 19.5V Power Adapter pcb ltc42691 QFN 0707 PSLDIC476MH 12v dc 750ma variable transformer PA1558NL lt426 pA1558
    Contextual Info: LTC4269-1 IEEE 802.3at PD with Synchronous No-Opto Flyback Controller DESCRIPTION FEATURES n n n n n n n n n n n n The LTC 4269-1 is an integrated Powered Device PD controller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. The


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    ltc4269-112-portltc4274cltc4278+1142691fclt42691power sourcing equipment90w 19.5v power adapter pcbltc42691qfn 0707psldic476mh12v dc 750ma variable transformerpa1558nllt426pa1558 PDF

    LTC4969-1

    Abstract: LTC4269-1 340 opto isolator kelvin 1102 LTC4269C-1 LTC4269CDKD-1 LTC4269I-1 LTC4269IDKD-1 of bel 187 transistor PE-68386NL
    Contextual Info: LTC4269-1 IEEE 802.3at PD with Synchronous No-Opto Flyback Controller DESCRIPTION FEATURES n n n n n n n n n n n n 25.5W IEEE 802.3at Compliant Type 2 PD Integrated State-of-the-Art Synchronous Flyback Controller – Isolated Power Supply Efficiency >92%


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    ltc4269-1300khzltc4268-1750ma+13ltc4269-2100khz500khz42691fltc4969-1340 opto isolatorkelvin 1102ltc4269c-1ltc4269cdkd-1ltc4269i-1ltc4269idkd-1of bel 187 transistorpe-68386nl PDF

    mps 0522

    Abstract: LTC4269CDKD-2 LTC3825 LTC4263 LTC4269-2 LTC4269C-2 LTC4269I-2 LTC4269IDKD-2 TLV431 Bridge rectifier 35A 100V data
    Contextual Info: LTC4269-2 IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support DESCRIPTION FEATURES n n n n n n n n n n n 25.5W IEEE 802.3at Compliant Type-2 PD PoE+ 2-Event Classification IEEE 802.3at High Power Available Indicator Integrated State-of-the-Art Synchronous Forward


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    ltc4269-2100khz500khzltc4268-1+13750ma50khz250khzltc4269-1mps 0522ltc4269cdkd-2ltc3825ltc4263ltc4269c-2ltc4269i-2ltc4269idkd-2tlv431bridge rectifier 35a 100v data PDF

    mps 0522

    Contextual Info: LTC4269-2 IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support DESCRIPTION FEATURES n n n n n n n n n n n 25.5W IEEE 802.3at Compliant Type-2 PD PoE+ 2-Event Classiication IEEE 802.3at High Power Available Indicator Integrated State-of-the-Art Synchronous Forward


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    ltc4269-2100khz500khz200khz+7300khzltc4268-1750ma50khz250khzltc4269-1mps 0522 PDF

    sg 66a

    Abstract: 1335A "Switching Regulator" t1is LTC4269IDKD-1
    Contextual Info: QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1335A-A HIGH POWER, HIGH EFFICIENCY POE PD INTERFACE WITH INTEGRATED SWITCHING REGULATOR LTC4269IDKD-1 DESCRIPTION Demonstration circuit 1335A-A is a high-power supply featuring the LTC 4269IDKD-1. This board acts


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    335a-altc4269idkd-14269idkd-1dc1366+8ieee802ltc426ulator57vport50vportsg 66a1335aswitching regulatort1is PDF

    diode 50v 5A

    Abstract: LTC4269IDKD-1 "power sourcing equipment"
    Contextual Info: QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1335A-B HIGH POWER, HIGH EFFICIENCY POE PD INTERFACE WITH INTEGRATED SWITCHING REGULATOR LTC4269IDKD-1 DESCRIPTION Demonstration circuit 1335A-B is a high-power supply featuring the LTC 4269IDKD-1. This board acts


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    335a-bltc4269idkd-14269idkd-1dc1366+5ieee802ltc426ted48vportdiode 50v 5apower sourcing equipment PDF

    NEC B1100

    Abstract: PE-68386NL PA2369NL LRC-LRF1206LF-01-R033-F GRM32ER72A225KA01 schematic diagram power supply Poe b1100 nec DO1608C-103MLB PA2467NL ETH1-230L
    Contextual Info: DEMO MANUAL DC1335B-B LTC4269-1 PoE+ 802.3at Powered Device Controller and Synchronous Flyback DESCRIPTION Demonstration circuit 1335B-B is a high-power supply featuring the LTC 4269-1. This board acts as an IEEE 802.3at compliant, high power Power-over-Ethernet


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    dc1335b-bltc4269-1dc1335bbfnec b1100+9pe-68386nlpa2369nllrc-lrf1206lf-01-r033-fgrm32er72a225ka01schematic diagram power supply poeb1100 necdo1608c-103mlbpa2467nleth1-230l PDF

    ltc4278

    Abstract: IEEE 802.3at PoE Powered Device Controllers LTC4268-1 LTC4269 LTC4269-1 LTC4269-2 "Power over Ethernet"
    Contextual Info: News Release ⎜ www.linear.com High Power PD Controllers with Built-In Switchers Address IEEE 802.3at PoE+ Standard MILPITAS, CA – June 30, 2009 – Linear Technology Corporation introduces the LTC4269-1, LTC4269-2 and LTC4278, IEEE 802.3at compliant Power over Ethernet PoE+ interface


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    ltc4269-1ltc4269-2ltc4278ltc4269+3ieee 802.3at poe powered device controllersltc4268-1power over ethernet PDF

    high voltage regulator schematic

    Abstract: t1is LTC4269IDKD-1 2A Step Up Switching voltage Regulator
    Contextual Info: QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1335A-C HIGH POWER, HIGH EFFICIENCY POE PD INTERFACE WITH INTEGRATED SWITCHING REGULATOR LTC4269IDKD-1 DESCRIPTION Demonstration circuit 1335A-C is a high-power supply featuring the LTC 4269IDKD-1. This board acts


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    335a-cltc4269idkd-14269idkd-1dc1366+7ieee802ltc426tegrated48vport50vporthigh voltage regulator schematict1is2a step up switching voltage regulator PDF

    63D14

    Abstract: PA2467NL ETH1-230LD SS-6488-NF-K1 2.2NF Switching Regulator 3528 PS2801-1-L DC-133 ETH1-230L PA2466
    Contextual Info: 5 4 3 J1 SS-6488-NF-K1 1 TX+ 9 6 SPARE1 4 2 10 5 TD- 3 OUT TXCT 11 4 RD+ 4 TO RXCT 12 3 RCT 5 PHY 13 2 RD- 6 14 1 5 C14 0.01uF 100V R4 75 C13 0.01uF 100V C15 0.01uF 100V C16 0.01uF 100V R6 75 1 C17 1000pF 2KV 1 +C5 1 C6 2.2uF 100V 1210 10uF 100V D1 SMAJ58A


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    ss-6488-nf-k11000pfeth1-230ldps2801-1-l+12do1608c-103smaj58ab1100bas21100uf63d14pa2467nl2.2nfswitching regulator 3528dc-133eth1-230lpa2466 PDF

    LTC4266 Software Programming

    Abstract: LTC4259A schematic diagram 48V power supply Poe 4266A4 LTC4266AIUHF-3#TRPBF ltc4266 application "power sourcing equipment"
    Contextual Info: LTC4266A/LTC4266C Quad PoE/PoE+/LTPoE+ PSE Controller DESCRIPTION FEATURES n n n n n n n n n n Four Independent PSE Channels Compliant with IEEE 802.3at Type 1 and 2 Low Power Dissipation 0.25Ω Sense Resistance Per Channel Very High Reliability 4-Point PD Detection


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    ltc4266a/ltc4266cltc4266altc4266ltc4266c+12400ma50khz250khz100khz500khzltc4266 software programmingltc4259aschematic diagram 48v power supply poe4266a4ltc4266aiuhf-3#trpbfltc4266 applicationpower sourcing equipment PDF

    mps 0812

    Abstract: RSIG diode LTC4274 Software Programming LTC4259A "power sourcing equipment"
    Contextual Info: LTC4274A/LTC4274C Single PoE/PoE+/LTPoE+ PSE Controller DESCRIPTION FEATURES n n n n n n n n n The LTC 4274A is a single Power Sourcing Equipment PSE controller capable of delivering up to 90W of LTPoE+ power to a compatible LTPoE+ Powered Device (PD). A


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    ltc4274a/ltc4274cltc4274altc4274ltc4274c+10400ma50khz250khz100khz500khzmps 0812rsig diodeltc4274 software programmingltc4259apower sourcing equipment PDF

    LTC4259A

    Contextual Info: LTC4274 Single PoE+ PSE Controller FEATURES n n n n n n n n n n DESCRIPTION Compliant with IEEE 802.3at Type 1 and 2 0.34Ω Total Channel Resistance 130mW/Port at 600mA Advanced Power Management 8-Bit Programmable Current Limit ILIM 7-Bit Programmable Overload Currents (ICUT)


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    ltc4274130mw/port600maltc4259a-1+7ltc426638-pin100khz500khzltc427850khzltc4259a PDF

    K1A 494

    Contextual Info: LTC4278 IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support DESCRIPTION FEATURES n n n n n n n n n n n n n 25.5W IEEE 802.3at Compliant Type 2 PD 10V to 57V Auxiliary Power Input Shutdown Pin for Flexible Auxiliary Power Support


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    ltc4278pro00v400ma300khz+4ltc4269-1ltc4269-24278fck1a 494 PDF

    i2c/poe pse

    Abstract: LTC4271 "power sourcing equipment"
    Contextual Info: LTC4290/LTC4271 8-Port PoE/PoE+/LTPoE+ PSE Controller Features Description Eight Independent PSE Channels n Compliant with IEEE 802.3at Type 1 and 2 n Chipset Provides Electrical Isolation Reduced BOM Cost Eliminates up to 6 High Speed Opto-Couplers Eliminates Isolated 3.3V Power Supply


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    ltc4290/ltc427140-leadltc429024-leification+9100khz500khz50khz250khz429071facom/ltc4290i2c/poe pseltc4271power sourcing equipment PDF

    TRANSISTOR BEL 187

    Abstract: "power sourcing equipment"
    Contextual Info: LTC4278 IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support DESCRIPTION FEATURES n n n n n n n n n n n n n The LTC 4278 is an integrated Powered Device PD controller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. With a wide input


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    ltc4278750maltc4267-1ltc4267-3+5ltc4269-1ltc4269-24278fbtransistor bel 187power sourcing equipment PDF