Power over Ethernet Solutions GND DGND RJ45 AGND RJ45 1 LTPoE++ PSE Controller 2 DATA PAIR 3 6 VEE 1 3 DATA PAIR 6 SENSE GATE OUT –55V 0.25Ω RCLASS 5 DC/DC V CONVERTER OUT – –VOUT 4 SPARE PAIR 7 8 + PWRGD LTPoE++ PD Controller –VIN 4 PSE GND 2 5 7 SPARE PAIR 8 PoE Benefits Power and Data Over a Single Ethernet Cable nn nn nn Simplified Wire Management Reach Difficult Locations High Port Density Up to 90W of Delivered Power nn nn More End Application Features Only 1 Port and 1 Cable Required Central Power Management nn nn nn Remotely Power Nodes On/Off Monitor and Measure Energy Usage Adjust Load Profiles or Settings On-the-Fly L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE++ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. PD Power Sourcing Equipment (PSE) PSE Types 1) Endpoint—provides data and power, typically used to build new PoE networks. 2) Midspan (Injector)—provides power and passes data, typically used to add PoE capability to existing non-PoE networks. 3) Extender (Power Forwarder)—provides data and power, typically used to extend PoE networks beyond 100m. 1) Endpoint PSE 3) Extender PSE 2) Midspan PSE Endpoint Ethernet Switch Endpoint (<100m) Extender Midspan PD PD Data PD Data and Power PSE Controllers Requirements 2 Implementation Isolation Isolate supply and communications from chassis ground. The 8-port LTC®4290/LTC4271 and 12-port LTC4270/ LTC4271 PSE chipsets eliminate up to six expensive optocouplers and an isolated supply by using less expensive (and more reliable) 10/100 Ethernet transformers. Detection Detect valid PD signatures (25kΩ) using a 2-point current or 2-point voltage detection scheme, as well as reject invalid PD signatures (<15kΩ and >33kΩ). Linear Technology PSE controllers use a 4-point (two voltages and two currents) detection scheme to eliminate false-positives and not power invalid PDs, including NICs or shorted ports. Detection of legacy PDs that predate the original IEEE 802.3af standard can also be manually enabled on a per port basis. Classification Type 1 PSEs can use a 1-event hardware classification scheme to detect optional PD classification signatures and limit the power draw. Type 2 PSEs can use either 2-event hardware or software—link layer discovery protocol (LLDP) classification schemes. Linear Technology PSE controllers classify PDs. LTPoE++™ PSEs use a 3-event hardware classification scheme to classify PDs as either Type 1, Type 2 or LTPoE++; this avoids the development costs and complexity of LLDP which is transparent to LTPoE++ communications. Regulation Regulate port power-up to 15.4W for Type 1 PDs and 30W for Type 2. Linear Technology PSE controllers use external MOSFETs and sense resistors to regulate voltages and currents to IEEE standards, resulting in lower total channel resistance (higher efficiency) and increased robustness. Protection No requirement. Linear Technology PSE controllers have 70V to 80V port pins and come with standard or custom recommendations for guarding against surge. PSE Example 3.3V No Isolation Required on I2C Interface Efficient Regulation XIO0 VDD33 GP0 GP1 MID RESET MSD AUTO INT Low Cost Isolation XIO1 S1B OUTn 3.3V • • S1B GATEn –54V 0.25Ω SENSEn LTC4271 SCL SDAIN SDAOUT AD0 AD1 AD2 AD3 AD6 DGND PORTn LTC4270 3.3V • • 100V S1B PORT1 GATE1 S1B 0.25Ω SENSE1 AGND CAP2 VEE VSSK CAP1 –54V OUT1 –54V Effective Detection and Simple Classification –54V –54V Robust Surge Protection LTPoE++ Detect/ Class Signaling Waveform PD Power Available by Class Power On VHSON VHSOFF VPORT Type 1 Type 2 Class Type 1 Type 2 LTPoE++ 0 13W – 38.7W 1 3.84W – 52.7W 2 6.49W – 70W 3 13W – 90W 4 13W 25.5W 25.5W LTPoE++ VCLASSMIN VSIGMAX Detect VRESET VSIGMIN Advanced Power Management Software and Hardware Linear Technology PSEs support a variety of operating modes and include per-port current monitoring, supply monitoring, one second current averaging and fieldupgradeable firmware. Linear Technology provides C libraries for customer systems at multiple levels, from control of basic PSE operation to management of overallocated and prioritized PoE switch systems. Auto Pin Detect/ Class Power-Up Automatic ICUT/ILIM Assignment AUTO Pin 1 Enabled at Reset Automatically Yes SemiAUTO 0 Host Enabled Upon Request No Manual 0 Once Upon Request Upon Request No Shutdown 0 Disabled Disabled No Mode 3 Low EMI 40 CISPR 22 CLASS B LIMIT Linear Technology PSEs use preventative techniques to minimize electromagnetic interference (EMI). For example, the blue line in the graph shows the GTEM radiated emissions scan for the 12-port LTC4270/ LTC4271 demo board (DC1840), which is safely below the CISPR 22 Class B limit, represented by the red line, with some appreciable margin to spare. RADIATED EMISSIONS (dBµV/m) 30 20 10 DC1840 0 GTEM CELL MEASUREMENT CORRECTED PER IEC 61000-4-20 DETECTOR = PEAK HOLD RBW = 120kHz VBW = 300kHz SWEEP TIME = 680ms # OF POINTS = 8084 NOISE FLOOR –10 –20 100 0 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) PSE Controller Selection Part Number Standard Number Internal of Ports Isolation LTPoE++ PoE+ • PoE PD Input Power • • 90W 7 × 8 QFN-52/4 × 4 QFN-24 DC1679 + SB002 • • 25.5W 7 × 8 QFN-52/4 × 4 QFN-24 DC1840 • 13W 7 × 8 QFN-52/4 × 4 QFN-24 DC1680 + SB021 • • 90W 6 × 6 QFN-40/4 × 4 QFN-24 DC1679 + SB073 • • 25.5W 6 × 6 QFN-40/4 × 4 QFN-24 DC1843 • 13W 6 × 6 QFN-40/4 × 4 QFN-24 DC1680 + SB090 • • 90W 5 × 7 QFN-38 DC1815 • • 25.5W 5 × 7 QFN-38, SSOP-36 DC1366 • 13W 5 × 7 QFN-38 • • 90W 5 × 7 QFN-38 DC1814 • • 25.5W 5 × 7 QFN-38 DC1567 Packages Demo Boards LTC4270A/LTC4271 12 • LTC4270B/LTC4271 12 • LTC4270C/LTC4271 12 • LTC4290A/LTC4271 8 • LTC4290B/LTC4271 8 • LTC4290C/LTC4271 8 • LTC4266A 4 LTC4266 4 LTC4266C 4 LTC4274A 1 LTC4274 1 LTC4274C 1 • 13W 5 × 7 QFN-38 LTC4263 1 • 13W 4 × 3 DFN-14, SO-14 • • • DC981A/B Cabling and Magnetics Standard PD Input Power IEEE PoE 13W IEEE PoE+ 25.5W 38.7W Linear Technology LTPoE++ 52.7W 70W 90W 4 Number of Cables Required Pairs Used (Out of 4) Cable Bundle Size 2 Min Cable Type Max Cable Current CAT3 350mA 600mA 100 1 4 Magnetics Standard 777mA CAT5e 1.1A 80 1.54A 25 2.2A High Power Powered Device (PD) PD Examples nn Security Cameras nn Access Points, Femtocells and Antennas nn IP Telephony (VoIP) and Call Stations nn HVAC, Lighting and Signage nn Medical Equipment nn Touchscreen Panels and Infotainment nn Point-of-Sale Readers and RFID Readers PD Controllers Requirements Implementation Isolation Isolate supply and communications from chassis ground. Linear Technology PDs with integrated DC/DC converters support isolated forward and flyback topologies. Linear Technology’s active-clamp forward configuration reduces costly transformer count and sizes, while the no-opto flyback configuration eliminates expensive and unreliable opto-couplers that are typically used in the feedback circuitry. Detection Present a signature (25kΩ) to PSE. All Linear Technology PD controllers integrate a 25kΩ signature resistor to simplify designs. Classification Type 1 PDs can support 1-event hardware classification. Type 2 PDs must support both 2-event hardware and software—link layer discovery protocol (LLDP) classification. All Linear Technology PD controllers support 1-event, 2-event or 3-event hardware classification, letting the PSE know that it is a Type 1, Type 2 or LTPoE++ PD; this avoids the development costs and complexity of LLDP, which happens on the data layer and is transparent to LTPoE++ communications. Polarity Correction Power can be applied to either the data or spare pairs in the Ethernet cable. Linear Technology’s LT®4321 ideal diode bridge controller replaces the two diode bridge rectifiers, typically found at the RJ45 input, with MOSFETs to correct polarity, increase efficiency and eliminate heat issues. Regulation No requirement. Linear Technology offers PD controllers without DC/DC controllers, providing designers the flexibility to choose their own DC/DC controllers, as well as PD controllers that integrate high efficiency DC/DC controllers to simplify designs. Protection No requirement. All Linear Technology PD controllers have 100V port pins, thermal protection and come with standard recommendations for guarding against surge. The LT4275 and LT4276 support a maximum junction temperature range of –40°C to 125°C. 5 DEVICE PD LT4321 (50mΩ FETs) DIODES (S2B) POWER DISSIPATION (W) 1.2 1.0 0.8 POWER SAVED 0.6 0.4 0.2 0 0 200 400 600 800 CURRENT (mA) Extremely Low Heat LTPoE++ solutions generate much less heat while delivering much more power than alternatives. Linear Technology’s latest generation of PD controllers (LT4276 and LT4275) utilize external MOSFETs and sense resistors to enable users to choose low resistance components in order to minimize heat dissipation, while increasing efficiency and reliability. Similarly, the LT4320 and LT4321 diode bridge controllers replace diodes with MOSFETs to lower channel resistance and improve thermal performance. 6 TYPE TYPE 1 TYPE 2 38.7W 52.7W 70W 90W TYPE 1 13W 13W 13W 13W 13W 13W TYPE 2 13W 25.5W 25.5W 25.5W 25.5W 25.5W 38.7W 13W 25.5W 38.7W 38.7W 38.7W 38.7W 52.7W 13W 25.5W – 52.7W 52.7W 52.7W 70W 13W 25.5W – – 70W 70W 90W 13W 25.5W – – – 90W Using low resistance components, including low RDS(ON) MOSFETs controlled by the LT4321 ideal diode bridge controller, LTPoE++ PDs provide up to 94% efficiency from the RJ45 input to the load, for simplified thermal designs and more power to the load. The load is able to harness more energy, and designs more easily stay within power budgets. IN12 = 55V IN36 = 0V IN45 = FLOAT IN78 = FLOAT 1.4 LTPoE++ 802.3AT Very Efficient 1.8 1.6 PSE STANDARD LTPoE++ LTPoE++ PSE and PD controllers provide up to 90W of power at the PD’s RJ45 input, while ensuring backward compatibility and interoperability with finalized IEEE PoE standards. LTPoE++ is expected to be compatible with IEEE 802.3bt, which should be finalized in 2017. 802.3AT Delivered Power 1000 High Efficiency PD Solution with 1 2VDC and 24VAC Auxiliary Input AUX INPUT DC TO 600Hz LT4320 Ideal Diode Bridge Controller ■ ■ ■ ■ 1 DATA PAIRS ■ 2 3 6 FORWARD OR FLYBACK DISCRETES LT4321 4 + PD Forward/Flyback Controller ■ VOUT LT4276 SPARE PAIRS Maximizes Power Efficiency Reduces Heat, Eliminates Thermal Design Problems DC to 600Hz 9V to 72V Operating Voltage Range IQ = 1.5mA (Typical) 5 ■ ■ 7 – ■ LTPoE++/PoE+/PoE Compliant High Efficiency Forward or No-Opto Flyback Operation Superior Surge Protection (100V) Wide Junction Temperature Range (–40°C to125°C) PoE Diode Bridge Controller 8 ■ ■ ■ ■ Maximizes Power Efficiency Reduces Heat, Eliminates Thermal Design Problems Less Than 800µA Quiescent Operating Current Fully Compatible with IEEE 802.3 Detection and Classification PD Controller Selection Part Number PD Input Power Standard 90W 25.5W 13W Integrated DC/DC Controller LTC4257 PoE • LTC4267 PoE • LTC4265 PoE+ • • LTC4269-1 PoE+ • • • LTC4269-2 PoE+ • • LTC4278 PoE+ • • LT4275A LTPoE++ • LT4275B PoE+ • LT4275C PoE LT4276A LTPoE++ LT4276B PoE+ LT4276C PoE • • Topology Integrated Hot Swap MOSFET Integrated Signature Temp Resistor Range Packages • • C, I DFN-8, SO-8 • • C, I DFN-16, SO-16 • • C, I DFN-12 Flyback • • C, I DFN-32 • Forward • • C, I DFN-32 • Flyback • • C, I DFN-32 • • I, H DFN-10, MSOP-10 • • I, H DFN-10, MSOP-10 • • I, H DFN-10, MSOP-10 • Flyback • • • Forward, Flyback • I, H QFN-28 • • • Forward, Flyback • I, H QFN-28 • • Forward, Flyback • I, H QFN-28 7 PD Demo Boards nn nn nn nn Complete ready to copy-and-paste reference designs, including schematics, BOMs and layout files Simultaneously evaluate PD controllers and ideal diode bridges Magnetics sized and specified for exact load voltages and currents Compatible with existing Linear Technology PSE demo boards Standard PD Input Power Output (V/I) Input Voltage Input-toOutput Efficiency LTC4267 PoE 3.84W 3.3V/1A 38V to 57V 75.0% DC804B-A LTC4267 PoE 13W 3.3V/2.6A 37V to 57V 78.0% DC917A LTC4267 PoE 13W 12V/0.9A 37V to 57V 85.0% DC1145B LTC4267 PoE 13W 37V to 57V 76.0% DC859A LTC4265 PoE+ 1.8V/2.5A, 2.5V/1.5A, 3.3V/0.5A 25.5W – 37V to 57V – DC1415 PoE+ 25.5W 3.3V/6.6A 37V to 57V 89.0% DC1335A-A PoE+ 25.5W 5V/4.5A 37V to 57V 91.0% DC1335B-B PoE+ 25.5W 12V/2A 37V to 57V 90.8% DC1335B-C PoE+ 25.5W 5V/4.6A 37V to 57V 92.5% DC1351B LTC4278 PoE+ 25.5W 5V/4.5A 9V to 57V 89.0% DC1561 LT4275C/LT4321 PoE 13W – 37V to 57V – DC2093A-C PoE+ 25.5W – 37V to 57V – DC2093A-B DC2093A-A IC Part Number LTC4269-1 LTC4269-1 LTC4269-1 LTC4269-2 LT4275B/LT4321 LT4275A/LT4321 LT4275A/LT4321/LTM 8027 ® LT4276C/LT4321 LT4276B/LT4321 LT4276B/LT4321 LT4276B/LT4321 LT4276B/LT4321 LT4276A/LT4321 LT4276A/LT4321 LT4276A/LT4321 LT4276B/LT4321 LT4276B/LT4321 LT4276A/LT4321 Demo Board Part Number LTPoE++ 90W – 37V to 57V – LTPoE++ 38.7W 12V/3A 37V to 57V 90.0% DC2125A PoE 13W 5V/2.3A 37V to 57V 90.0% DC2046A-F PoE+ 25.5W 3.3V/6.8A 37V to 57V 90.0% DC2046A-A PoE+ 25.5W 5V/4.7A 37V to 57V 92.0% DC2046A-B PoE+ 25.5W 12V/1.9A 37V to 57V 92.0% DC2046A-C PoE+ 25.5W 24V/1A 37V to 57V 92.0% DC2046A-D LTPoE++ 38.7W 5V/7A 37V to 57V 92.0% DC2046A-E LTPoE++ 70W 5V/13A 37V to 57V 92.5% DC2262A-A LTPoE++ 90W 12V/7A 37V to 57V 93.5% DC2262A-B PoE+ 25.5W 5V/4.5A 9V to 57V 91.0% DC2047A-A PoE+ 25.5W 12V/1.9A 9V to 57V 93.5% DC2047A-B LTPoE++ 90W 5V/17A 37V to 57V 93.5% DC2262A-C www.linear.com/LTPoE n 1-800-4-LINEAR 1015