LTC4292/LTC4291 4-Port IEEE 802.3bt PoE PSE Controller FEATURES DESCRIPTION Four PSE Ports nn Two Power Channels Per Port nn Fully Compliant IEEE 802.3bt Type 3 and 4 PSE nn Compliant Support for Type 1, 2, 3, and 4 PDs nn Low Power Path Dissipation per Channel nn 150mΩ Sense Resistance nn 30mΩ or Lower MOSFET R DS(ON) nn Chipset Provides Electrical Isolation nn Eliminates Optos and Isolated 3.3V Supply nn Very High Reliability Multipoint PD Detection nn Connection Check Distinguishes SingleSignature and Dual-Signature PDs nn Continuous, Dedicated Per-Port Power and Current Monitoring nn Per-Port Power Policing nn 1MHz I2C Compatible Serial Control Interface nn Pin or I2C Programmable PD Power Up to 71.3W nn Available in a 40-Lead 6mm × 6mm (LTC4292) and 24-Lead 4mm × 4mm (LTC4291) QFN Package The LTC®4292/LTC4291 chipset is a 4-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC4292/LTC4291 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC4292/LTC4291 chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON) external MOSFETs and 0.15Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply, resulting in significant BOM cost savings. nn Advanced power management features include perport 14‑bit current monitoring, programmable current limit, and versatile fast shut-down of preselected ports. Advanced power management host software is available under a no-cost license. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC4292/ LTC4291 includes an I2C serial interface operable up to 1MHz. The LTC4292/LTC4291 is pin or I2C programmable to negotiate PD delivered power up to 71.3W. APPLICATIONS nn nn PoE PSE Switches/Routers PoE PSE Midspans All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION AGNDP 10Ω 0.1µF GP0 3.3V >47µF VEE VDD LTC4291 DGND CAP1 4 S1B 5 7 0.1µF 2nF 2kV 6 TX3 S1B GATEnB DNA 1µF VEE OUTnB 100Ω DND 0.22µF 100V LTC4292 VEE 100Ω SDAOUT VSSKn TX2 AGNDP 100Ω 3.3V SDAIN AD0 AD1 AD2 AD3 DPA 100Ω SCL 0.15Ω SENSEnA CNA DPD 2 3 100Ω CND TX1 S1B S1B GATEnA VEE 100Ω MSD 0.22µF 100V 100Ω 3.3V RESET AGNDP AGNDP OUTnA CPA 100Ω AUTO INT PWRMD1 CPD 4PVALID (NO I2C ISOLATION REQUIRED) PWRMD0 ISOLATION GP1 1 1µF 100V CAP2 VEE VEE 0.15Ω SENSEnB VSSKn VSSKn TX4 VEE 8 1000BASE-T 0.22μF, 100V 0.15Ω (1 OF 4 PORTS) RJ45 429291 TA01a AGNDP VSSKn Rev 0 Document Feedback For more information www.analog.com 1 LTC4292/LTC4291 ABSOLUTE MAXIMUM RATINGS (Notes 1, 4) (Note 1) LTC4292 Supply Voltages AGNDP – VEE.......................................... –0.3V to 80V VSSK12, VSSK34 (Note 7).... VEE – 0.3V to VEE + 0.3V Digital Pins PWRMD0, PWRMD1......... VEE – 0.3V to CAP2 + 0.3V Analog Pins SENSEnM, GATEnM, OUTnM .VEE – 0.3V to VEE + 80V CAP2 (Note 13) ....................... VEE – 0.3V to VEE + 5V CPA, CNA, DPA, DNA...............VEE – 0.3V to VEE + 0.3 Operating Ambient Temperature Range LTC4292I..............................................–40°C to 85°C Junction Temperature (Note 2)............................. 125°C Storage Temperature Range................... –65°C to 150°C LTC4291 Supply Voltages VDD – DGND.......................................... –0.3V to 3.6V Digital Pins SCL, SDAIN, SDAOUT, INT, RESET, MSD, ADn, AUTO, 4PVALID, GPn ..................DGND – 0.3V to VDD + 0.3V Analog Pins CAP1 (Note 13)............................–0.3V to DGND + 2V CPD, CND, DPD, DND.......DGND – 0.3V to VDD + 0.3V Operating Ambient Temperature Range LTC4291I..............................................–40°C to 85°C Junction Temperature (Note 2)............................. 125°C Storage Temperature Range................... –65°C to 150°C PIN CONFIGURATION LTC4291 VEE VSSK12 5 24 GATE3B OUT2A 8 23 OUT3B GATE2B 9 22 GATE3A PWRMD1 SENSE4B SENSE4A SENSE3B SENSE3A SENSE2B SENSE2A SENSE1B SENSE1A PWRMD0 CAP1 VDD 15 INT DGND 5 14 RESET 4PVALID 6 11 12 13 14 15 16 17 18 19 20 UJ PACKAGE 40-LEAD (6mm × 6mm) PLASTIC QFN TJMAX = 125°C, θJC = 2°C/W, θJA = 33°C/W EXPOSED PAD (PIN 41) IS VEE, MUST BE SOLDERED TO PCB 16 SDAOUT 25 DGND AD3 4 21 OUT3A OUT2B 10 17 SDAIN AD2 3 25 AGNDP GATE2A 7 18 SCL AD1 2 26 VSSK34 41 VEE CAP2 6 AD0 1 13 DNC 7 8 9 10 11 12 VDD 27 OUT4A AUTO OUT1B 4 24 23 22 21 20 19 DND 28 GATE4A GP0 GATE1B 3 MSD 29 OUT4B NC OUT1A 2 CPD 30 GATE4B GP1 TOP VIEW 40 39 38 37 36 35 34 33 32 31 GATE1A 1 DPD NC VEE NC NC DNA DPA CNA CPA VEE TOP VIEW CND LTC4292 UF PACKAGE 24-LEAD (4mm × 4mm) PLASTIC QFN TJMAX = 125°C, θJC = 4°C/W, θJA = 47°C/W EXPOSED PAD (PIN 25) IS DGND, MUST BE SOLDERED TO PCB Rev 0 2 For more information www.analog.com LTC4292/LTC4291 ORDER INFORMATION http://www.linear.com/product/LTC4292#orderinfo LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4291IUF#PBF LTC4291IUF#TRPBF 4291 24-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C LTC4292IUJ#PBF LTC4292IUJ#TRPBF LTC4292UJ 40-Lead (6mm × 6mm) Plastic QFN –40°C to 85°C Consult ADI Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. Rev 0 For more information www.analog.com 3 LTC4292/LTC4291 TYPICAL APPLICATION Figure 34. IEEE 802.3bt Type 3 or Type 4 PSE, Alternative A (MDI-X) and Alternative B(S), 1000BASE-T, 1 of 4 Ports Shown GP0 D1 VEE VDD >47µF ISOLATION PWRMD1 CPD 4PVALID LTC4291 CNA DPD DPA 100Ω 3.3V SDAIN DGND CAP1 0.22µF 100V QnB GATEnB VEE 6 4 TX3 S1B 5 7 S1B 0.15Ω 0.1µF 2nF 2kV 3 TX2 OUTnB DNA 1µF 2 S1B VSSKn LTC4292 100Ω DND S1B AGNDP VEE 100Ω SDAOUT AD0 AD1 AD2 AD3 100Ω 100Ω TX1 0.15Ω SENSEnA CND SCL QnA GATEnA VEE 100Ω MSD 0.22µF 100V 100Ω 3.3V RESET 1 AGNDP AGNDP OUTnA CPA 100Ω AUTO INT 1µF 100V D2 PWRMD0 GP1 (NO I2C ISOLATION REQUIRED) AGNDP 10Ω QnA, QnB: PSMN040-100MSE D1: SMCJ58A D2: SMAJ58A 0.1µF 3.3V CAP2 VEE SENSEnB VSSKn VSSKn TX4 VEE 8 1000BASE-T 0.22μF, 100V VEE 0.15Ω RJ45 (1 OF 4 PORTS) 429291 F34 AGNDP VSSKn RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT4294 LTPoE++/PoE+/PoE PD Controller External Switch, IEEE 802.3bt Support Configurable Class LT4295 IEEE 802.3bt PD with Forward/Flyback Switching Regulator Controller External Switch, IEEE 802.3bt Support, Configurable Class, Forward or No-Opto Flyback Operation, Frequency, PG/SG Delays, Soft-Start, and Aux Support as Low as 9V, Including Housekeeping Buck, Slope Compensation LTC4257-1 IEEE 802.3af PD Interface Controller Internal 100V, 400mA Switch, Dual Current Limit, Programmable Class LTC4263 Single IEEE 802.3af PSE Controller Internal FET Switch LTC4265 IEEE 802.3at PD Interface Controller Internal 100V, 1A Switch, 2-Event Classification Recognition LTC4266 Quad IEEE 802.3at PoE PSE Controller With Programmable ICUT/ILIM, 2-Event Classification, and Port Current and Voltage Monitoring LTC4267 IEEE 802.3af PD Interface with Integrated Switching Regulator Internal 100V, 400mA Switch, Dual Inrush Current, Programmable Class LTC4269-1 IEEE 802.3at PD Interface with Integrated Flyback Switching Regulator 2-Event Classification, Programmable Class, Synchronous No-Opto Flyback Controller, 50kHz to 250kHz, Aux Support LTC4269-2 IEEE 802.3at PD Interface with Integrated 2-Event Classification, Programmable Class, Synchronous Forward Controller, 100kHz to Forward Switching Regulator 500kHz, Aux Support 12-Port PoE/PoE+/LTPoE++® PSE Controller Transformer Isolation, Supports Type 1, Type 2 and LTPoE++ PDs LTC4270/ LTC4271 LTC4278 IEEE 802.3at PD Interface with Integrated Flyback Switching Regulator 2-Event Classification, Programmable Class, Synchronous No-Opto Flyback Controller, 50kHz to 250kHz, 12V Aux Support LTC4279 Single PoE/PoE+/LTPoE++ PSE Controller Supports IEEE 802.3af, IEEE 802.3at, LTPoE++ and Proprietary PDs LTC4290/ LTC4271 8-Port PoE/PoE+/LTPoE++ PSE Controller Transformer Isolation, Supports IEEE 802.3af, IEEE 802.3at and LTPoE++ PDs Rev 0 4 D16832-0-4/18(0) www.analog.com For more information www.analog.com ANALOG DEVICES, INC. 2018