LT4295

LT4295 (Rev. B)

Document overview

• Manufacturer or author: Analog Devices, Inc.
• PDF pages: 32

Technical content

Rev. BFor more information www.analog.com TYPICAL APPLICATION FEATURES DESCRIPTION IEEE 802.3bt PD Interface with Forward/Flyback Controller IEEE 802.3bt 71.3W (Class 8) PD Controller and Power Supply in Forward Mode

APPLICATIONS

n High Power Wireless Data Systems n Outdoor Security Camera Equipment n Commercial and Public Information Displays n High Temperature Applications n IEEE 802.3af/at/bt Powered Device (PD) with Forward/Flyback Controller n Supports Up to 71.3W PDs n 5-Event Classification Sensing n Superior Surge Protection (100V Absolute Maximum) n Wide Junction Temperature Range (–40°C to 125°C) n >94% End-to-End Efficiency with LT4321 Ideal Bridge n External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency n No-Opto Flyback Operation n Auxiliary Power Support as Low as 9V n Easy Migration of L TPoE++® PDs to IEEE 802.3bt PDs n Pin Compatible with LT4276A/B/C n 28-Lead 4mm × 5mm QFN Package The LT®4295 is an IEEE 802.3af/at/bt-compliant powered device (PD) interface controller with a switching regulator controller . The T2P output indicates the number of clas- sification events received during IEEE 802.3bt-compliant mutual identification and negotiation of available power The LT4295 supports both forward and flyback power supply topologies. The flyback topology supports No-Opto feedback. Auxiliary input voltages can be accurately sensed with just a resistor divider connected to the AUX pin. The LT4295 utilizes an external, low R DS(on) N-channel hot swap MOSFET and supports the LT4320/LT4321 ideal diode bridges, to extend the end-to-end power delivery efficiency and eliminate costly heat sinks. The LT4295 also includes an on-chip detection signature resistor , thermal protection, slope compensation, and many user configurable settings including classification signature, inrush current, switcher frequency, gate drive delay, soft-start and load compensation.••VPORT VPORT RCLASS AUX RCLASS++ SW VCC VCCVIN VCC 0.1µF 10µFBAV19WS (TRR ≤50ns) 22µF HS GATE HS SRC FFS D LY PG SG ITHB TO MICROPROCESSOR ISEN+ ISEN–

4295 TA01

100µH AUX 37V TO 57V FMMT723 20m/uni03A9 13A –3.3k 10k0.1µF 100pF 10nF 100k L T4295 OPTO Single-Signature Power Classification (at PD Input) CLASS POWER 0 13W 1 3.84W 2 6.49W 3 13W 4 25.5W 5 40W 6 51W 7 62W 8 71.3W All registered trademarks and trademarks are the property of their respective owners. Document Feedback

Rev. B For more information www.analog.com PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS RCLASS, RCLASS++ Voltages SFST, FFSDLY, ITHB, T2P Voltages FB31 Voltage 0mA AUX Current ROSC Current RLDCMP Current T2P Current Operating Junction Temperature Range (Note 3) LT4 295I LT4 295H to 125°C Storage Temperature Range (Notes 1, 2) 9 10 TOP VIEW UFD PACKAGE 28-LEAD (4mm × 5mm) PLASTIC QFN TJMAX = 150°C, θJC = 3.4°C/W EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB 11 12 13 28 27 26 25 24 1GND AUX RCLASS++ RCLASS T2P VCC VCC VCC DNC VCC PG GND SG ISEN ISEN– RLDCMP VPORT NC HSGATE HSSRC V IN SWVCC VCC ROSC SFST FFSDLY ITHB FB31 8 15 GND LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT4295IUFD#PBF LT4295IUFD#TRPBF 4295 28-Lead (4mm × 5mm) Plastic QFN –40°C to 85°C LT4295HUFD#PBF LT4295HUFD#TRPBF 4295 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container . Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. ORDER INFORMATION

Rev. BFor more information www.analog.com

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VPORT, HSSRC, VIN Operating Voltage At VPORT Pin l 60 V VSIG VPORT Detection Signature Range At VPORT Pin l 1.5 10 V VCLASS VPORT Classification Signature Range At VPORT Pin l 12.5 21 V VMARK VPORT Mark Event Range At VPORT Pin, After 1st Classification Event l 5.6 10 V VPORT AUX Range At VPORT Pin, VAUX ≥ 6.45V l 8 60 V Detect/Class Hysteresis Window l 1.0 V Reset Threshold l 2.6 5.6 V VHSON Hot Swap Turn-On Voltage l 35 37 V VHSOFF Hot Swap Turn-Off Voltage l 30 31 V Hot Swap On/Off Hysteresis Window l 3 V Supply Current VPORT, HSSRC and VIN Supply Current V VPORT = VHSSRC = VVIN = 60V l 2 mA VPORT Supply Current During Classification V VPORT = 17.5V, RCLASS, RCLASS++ Open l 0.7 1.0 1.3 mA VPORT Supply Current During Mark Event V VPORT = VMARK after 1st Classification Event l 0.4 2.2 mA Detection and Classification Signature Detection Signature Resistance VSIG (Note 4) l 23.6 24.4 25.5 kΩ Resistance During Mark Event VMARK (Note 4) l 5.2 8.3 11.4 kΩ RCLASS/RCLASS++ Voltage –10mA ≥ IRCLASS ≥ –36mA, VCLASS l 1.36 1.40 1.43 V Classification Signature Stability Time V VPORT Step GND to 17.5V, 35.7Ω from RCLASS to GND l 2 ms Digital Interface T2P Output High VVCC - VT2P, –1mA Load l 0.3 V T2P Leakage VT2P = 0V l –1 1 µA Hot Swap Control I GPU HSGATE Pull Up Current VHSGATE - VHSSRC = 5V (Note 5) l –27 –22 –18 µA HSGATE Voltage –10µA Load, with Respect to HSSRC l 10 14 V HSGATE Pull Down Current VHSGATE - VHSSRC = 5V l 400 µA VCC Supply VCCREG V CC Regulation Voltage l 7.2 7.6 8.0 V Feedback Amplifier V FB FB31 Regulation Voltage l 3.11 3.17 3.23 V FB31 Pin Bias Current RLDCMP Open -0.1 µA gm Feedback Amplifier Average Trans-Conductance Time Average, –2µA < IITHB < 2µA l –52 –40 –26 µA/V ISINK ITHB Average Sink Current Time Average, VFB31 = 0V l 4.4 8.0 13.4 µA Soft-Start I SFST Charging Current VSFST = 0.5V, 3.0V l –49 –42 –36 µA The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VVPORT = VHSSRC = VVIN = 40V, VVCC = VCCREG, ROSC, PG, and SG Open, RFFSDLY = 5.23kΩ to GND. AUX connected to GND unless otherwise specified. (Note 2)

Rev. B For more information www.analog.com SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Outputs PG, SG Output High Level I = –1mA l VCC –0.1 V PG, SG Output Low Level I = 1mA l 1 V PG Rise Time, Fall Time PG = 1000pF 15 ns SG Rise Time, Fall Time SG = 400pF 15 ns Current Sense/Overcurrent VFAULT Overcurrent Fault Threshold VISEN+ – VISEN– l 125 140 155 mV ΔVSENSE/ ΔVITHB Current Sense Comparator Threshold with Respect to VITHB l –130 –111 –92 mV/V VITHB(OS) VITHB Offset l 3.03 3.17 3.33 V Timing fOSC Default Switching Frequency ROSC Pin Open l 200 214 223 kHz Switching Frequency 45.3kΩ from ROSC to GND l 280 300 320 kHz fT2P T2P Signal Frequency fSW/256 T2P Duty Cycle in PoE Operation (Note 7) After 4-Event Classification After 5-Event Classification (RCLASS++ Has Resistor to GND) T2P Duty Cycle in Auxiliar y Supply Operation (Note 7) V(AUX) > VAUXT, and RCLASS++ Has Resistor to GND 25 % tMIN Minimum PG On Time l 175 250 330 ns DMAX Maximum PG Duty Cycle l 63 66 70 % tPGDELAY PG Turn-On Delay-Flyback PG Turn-On Delay-Forward 5.23kΩ from FFSDL Y to GND 52.3kΩ from FFSDLY to GND 10.5kΩ from FFSDLY to V CC 52.3kΩ from FFSDLY to VCC 171 391 ns ns ns ns t FBDLY Feedback Amp Enable Delay Time 350 ns tFB Feedback Amp Sense Interval 550 ns tPGSG PG Falling to SG Rising Delay Time-Flyback PG Falling to SG Falling Delay Time- Forward Resistor from FFSDL Y to GND 10.5kΩ from FFSDL Y to VCC 52.3kΩ from FFSDL Y to VCC 301 ns ns ns t START Start Timer (Note 6) Delay After Power Good l 80 86 93 ms tFAULT Fault Timer (Note 6) Delay After Overcurrent Fault l 80 86 93 ms IMPS MPS Current l 10 12 14 mA ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VVPORT = VHSSRC = VVIN = 40V, VVCC = VCCREG, ROSC, PG, and SG Open, RFFSDLY = 5.23kΩ to GND. AUX connected to GND unless otherwise specified. (Note 2) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2. All voltages with respect to GND unless otherwise noted. Positive currents are into pins; negative currents are out of pins unless otherwise noted. Note 3. This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature can exceed 150°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 4. Detection signature resistance specifications do not include resistance added by the external diode bridge which can add as much as 1.1kΩ to the port resistance. Note 5. I GPU available in PoE powered operation. That is, available after V(VPORT) > VHSON and V(AUX) < VAUXT, over the range where V(VPORT) is between VHSOFF and 60V. Note 6. Guaranteed by design, not subject to test. Note 7. Specified as the percentage of the period which T2P is low impedance with respect to V CC.

Rev. BFor more information www.analog.com TYPICAL PERFORMANCE CHARACTERISTICS VFB31 vs Temperature Feedback Amplifier Output Current vs VFB31 Switching Frequency vs Temperature Current Sense Voltage vs Duty Cycle, I THB PG Delay Time vs Temperature in Flyback Mode PG, SG Delay Time vs Temperature in Forward Mode Input Current vs Input Voltage 25k Detection Signature Range Detection Signature Resistance vs Input Voltage V CC Current vs Temperature VPORT VOL TAGE (V) VPORT CURRENT (mA) 0.4 0.3 0.2 0.1 0.5 6 8 102 4

4295 G01

125°C 85°C 25°C –40°C VPORT VOL TAGE (V)

23.75 SIGNATURE RESISTANCE (k/uni03A9)

25.75 25.25 24.75 24.25 26.25 6 5 8 7 92 4 3

4295 G02

125°C 85°C 25°C –40°C TEMPERATURE (°C) –50 VCC CURRENT (mA) 50 25 100 751250 –25

4295 G03

TEMPERATURE (°C) –50

3.162 VFB31 (V)

3.176 3.174 3.172 3.170 3.168 3.166 3.164 3.178 50 25 100 751250 –25

4295 G04

FB31 VOL TAGE (V) 2.57 –15 ITHB CURRENT (µA) –10

4295 G05

125°C 85°C 25°C –40°C TEMPERATURE (°C) –50 DELAY TIME (ns) 350 200 250 300 150 100 400 50 25 100 751250 –25

4295 G09

TPGDELAY, 52.3k FROM FFSDL Y TO VCC TPGSG, 52.3k FROM FFSDL Y TO VCC TPGDELAY, 10.5k FROM FFSDL Y TO VCC TPGSG, 10.5k FROM FFSDL Y TO VCC TEMPERATURE (°C) –50 175 FREQUENCY (kHz) 300 275 250 225 200 325 50 25 100 751250 –25

4295 G06

45.3k FROM ROSC TO GND ROSC OPEN VITHB = 1.8V VITHB = 2.3V VITHB = 2.6V VITHB = 2.9V DUTY CYCLE (%) V(ISEN+ - ISEN–) (mV) 140 100 120 160 40 30 60 50 7020 10

4295 G07

VITHB = 0.96V (FB31 = 0V) TEMPERATURE (°C) –50 PG DELAY TIME (ns) 200 150 100 250 50 25 100 75 1250 –25

4295 G08

TPGDELAY, 5.23k FROM FFSDL Y TO GND TPGDELAY, 52.3k FROM FFSDL Y TO GND

Rev. B For more information www.analog.com PIN FUNCTIONS GND(Pins 1, 19, Exposed Pad Pin 29): Device Ground. Exposed Pad must be electrically and thermally connected to pins 1, 19 and PCB GND. AUX (Pin 2): Auxiliary Sense. Assert AUX via a resistive divider from the auxiliary power input to set the voltage at which the auxiliary supply takes over . Asserting AUX pulls down HSGATE, disconnects the detection signature resistor and disables classification signature. The AUX pin sinks IAUXH when below its threshold voltage, of VAUXT, to provide hysteresis. Connect to GND if not used. RCLASS++ (Pin 3): Class Select Input. Connect a resistor between RCLASS++ to GND per Table 1. RCLASS (Pin 4): Class Select Input. Connect a resistor between RCLASS and GND per Table 1. T2P (Pin 5): PSE Type Indicator . Open drain with respect to V CC. See the T2P Output section for pin behavior . VCC (Pins 6, 7, 8, 9, 21): Switching Regulator Controller Supply Voltage. Connect a local ceramic capacitor from V CC pin 21 to GND pin 19 as close as possible to LT4295 as shown in Table 3. ROSC (Pin 10): Programmable Frequency Adjustment. Resistor to GND programs operating frequency. Leave open for default frequency of 214kHz. SFST (Pin 11): Soft-Start. Capacitor to GND sets soft- start timing. FFSDL Y (Pin 12): Forward/Flyback Select and Primary Gate Delay Adjustment. Resistor to GND adjusts gate drive delay for a flyback topology. Resistor to VCC adjusts gate drive delay for a forward topology. ITHB (Pin 13): Current Threshold Control. The voltage on this pin corresponds to the peak current of the exter- nal primary FET . Note that the voltage gain from ITHB to the input of the current sense comparator (V SENSE) is negative. FB31 (Pin 14): Feedback Input. In flyback mode, connect external resistive divider from the third winding feedback. Reference voltage is 3.17V. Connect to GND in forward mode. RLDCMP (Pin 15): Load Compensation Adjustment. Optional resistor to GND controls output voltage set point as a function of peak switching current. Leave RLDCMP open if load compensation is not needed. ISEN – (Pin 16): Current Sense, Negative Input. Route as a dedicated trace to the return side of the current sense resistor . ISEN+ (Pin 17): Current Sense, Positive Input. Route as a dedicated trace to the sense side of the current sense resistor . SG (Pin 18): Secondary (Synchronous) Gate Drive Output. PG (Pin 20): Primary Gate Drive Output. DNC (Pin 22): Do Not Connect. Leave pin open. SWVCC (Pin 23): Switch Driver for V CC’s Buck Regulator . This pin drives the base of a PNP in a buck regulator to generate VCC. VIN (Pin 24): Buck Regulator Supply Voltage. Usually separated from HSSRC by a pi filter . HSSRC (Pin 25): External Hot Swap MOSFET Source. Connect to source of the external MOSFET . HSGATE (Pin 26): External Hot Swap MOSFET Gate Control Output. Capacitance to GND determines inrush time. NC (Pin 27): No Connection. Not internally connected. VPORT (Pin 28): PD Interface Supply Voltage and External Hot Swap MOSFET Drain Connection.

Rev. BFor more information www.analog.com BLOCK DIAGRAM SLOPE COMP OSC TSD CP SWITCHING REGULATOR CONTROLLER PD INTERFACE CONTROLLER START-UP REGULATOR INTERNAL BUCK CONTROLLER 1.4V 1.4V HSGATE HSSRC 11V VPORT VPORT SWVCCVIN VCC ITHB SFST FFSDL Y ROSC ISEN+ ISEN– 4295 BD T2P GND PG SG VCC VPORT RCLASS RCLASS++ AUX VAUXT IAUXH FB31 RLDCMP FEEDBACK AMP gm = –40µA/V LOAD COMP CURRENT FAUL T COMPARATOR CURRENT SENSE COMPARATOR VFB VFAUL T AV = 10 AV = 1 VCC VSENSE VITHB(OS) AV = ∆VSENSE ∆VITHB

isolated power supply operation. beyond the allowable power levels of IEEE 802.3bt. ITHB pin offset voltage, VITHB(OS), is 3.17V. See Figure 1. Figure 1. VSENSE vs. VITHB overshoot using inexpensive external components. The error amp feedback voltage VFB is 3.17V. this resistor determines the tPGDELAY and tPGSG. Table 1. Single-Signature Classification, Power Levels and Resistor Selection

4295 F01

Figure 2. Type 3 or Type 4 PSE, 1-Event Class Sequence Figure 3. Type 2 PSE, 2-Event Class Sequence in the Applications Information. be used to generate the VCC supply voltage. on the input voltage sequence applied to the VPORT pin. this data sheet are limited in scope to single-signature PDs. The class/mark process varies depending on the PSE type. sification probe voltage, or powering up the PD. An example of 1-Event classification is shown in Figure 2.

4295 F02

4295 F03

operate in a lower power state. CLS and RCLS++ resistor values.

Table 2. PSE Allocated Power Note: Bold indicates the PD has been demoted. events depending on type to Class 4 PDs (see Figure 4). Figure 4. Type 3 or Type 4 PSE, 3-Event Class Sequence Figure 5. Type 3 or Type 4 PSE, 4-Event Class Sequence Figure 6. Type 4 PSE, 5-Event Class Sequence

4295 F04

4295 F05

4295 F06

demote those PDs to Class 6 (51W).

Figure 7. Programming IINRUSH Figure 8. VCC Buck Regulator 1% resistor between the RCLASS, RCLASS++ pin and GND. port as required by the IEEE 802.3 specification. inrush current, IINRUSH. Design IINRUSH to be ~100mA.

4276 F07

considerably higher than average load current on V CC.

4276 F08

dissipation, and eases thermal design. Table 3. Buck Regulator Component Selection on (VAUXON) and turn off (V AUXOFF) voltage thresholds.

an internal 6.5V Zener limits the voltage on the AUX pin. associated PSE allocated power are shown in Table 4. sized to provide at least the PD Requested Power . Class is 0−4 or 5−8, as shown in Table 1. Figure 9. AUX Threshold and Hysteresis Calculation

4295 F09

Table 4. T2P Response to Determine PSE Allocated Power

1 Hi-Z 13W

• Specified as the percentage of the period which T2P is low impedance with respect to VCC.

**Table 5. LT4295 Interoperability {T2P Response*, PSE Allocated Power , Number of Classification Events}** allocated power , and the number of classification events.

Figure 10. PG and SG Timing Relationship in Flyback Mode Figure 11. Example PG and SG Connections in Flyback Mode

4295 F10

• • PG SGGND L T4295

4295 F11

shown in Figure 11 to prevent PG from going negative. ment of the potentiometer does not exceed 52.3kΩ. vent PG from going negative. Figure 12. PG and SG Timing Relationship in Forward Mode Figure 13. Example PG and SG Connections in Forward Mode

4295 F12

• • PG VCC VCC SG GND L T4295

4295 F13

voltage discussed subsequently. primary winding on the RLDCMP pin. Figure 14. Feedback and Load Compensation Connection

4295 F15

Figure 15. Feedback Amplifier Timing Diagram

• FEEDBACKFB31 L T4295 THIRD PRIMARY

4295 F14

10kΩ may be initially used for R LDCMP and adjusted. Figure 8 once the power supply is in steady-state. to the desired soft-start time. Figure 16. Opto-isolator Feedback Connections in the

4295 F16

re peating at an inter val of tFAUL T. must be Kelvin connected to the sense resistor pads. The LT4295 incorporates current slope compensation. stability when the duty cycle is greater than or near 50%. the maximum peak current at higher duty cycles. is performed by varying RX and CX in Figure 16.

4295 F17

Figure 17. PG Waveforms with Output Shorted timing but overheats if this condition persists abnormally. ables the switching regulator operation.

Rev. B For more information www.analog.com APPLICATIONS INFORMATION A silicon diode bridge consumes up to 4% of the avail - able power . In addition, silicon diode bridges exhibit poor pairset-to-pairset unbalance performance. Each branch of a silicon diode bridge shares source/return current, and thermal runaway can cause large, non-compliant current unbalances between pairsets. While using Schottky diodes can help reduce the power loss with a lower forward voltage, the Schottky bridge may not be suitable for high temperature PD applications. Schottky diode bridges exhibit temperature induced leak- age currents. The leakage current has a voltage depen - dency that can invalidate the measured detection signa - ture. In addition, these leakage currents can back-feed through the unpowered branch and the unused bridge, violating IEEE 802.3 specifications. For high efficiency applications, the LT4295 supports an LT4321-based PoE ideal diode bridge that reduces the forward voltage drop from 0.7V to 20mV per diode while maintaining IEEE 802.3 compliance. The LT4321 simpli- fies thermal design, eliminates costly heatsinks, and can operate in space-constrained applications. MAXIMUM DUT Y CYCLE The maximum duty cycle of the PG pin is modified by the chosen tPGDELAY and fSW. It is calculated below: MAX POWER SUPPL Y DUTY CYCLE = D MAX – tPGDELAY • fSW For an appropriate margin during transient operation, the forward or flyback power supply should be designed so that its maximum steady-state duty cycle should be about 10% lower than the LT4295 Maximum Power Supply Duty Cycle calculated above. EXTERNAL INTERFACE AND COMPONENT SELECTION PoE Input Bridge A PD is required to polarity-correct its input voltage. There are several different options available for bridge rectifiers; silicon diodes, Schottky diodes, and ideal diodes. When silicon or Schottky diode bridges are used, the diode for- ward voltage drops affect the voltage at the VPORT pin. The LT4295 is designed to tolerate these voltage drops. Note, the voltage parameters shown in the Electrical Characteristics section are specified at the LT4295 pack- age pins.

Rev. BFor more information www.analog.com APPLICATIONS INFORMATION Auxiliary Input Diode Bridge Some PDs are required to receive AC or DC power from an auxiliary power source. A diode bridge is typically required to handle the voltage rectification and polarity correction. In high efficiency applications, or in low auxiliary input voltage applications, the voltage drop across the rectifier cannot be tolerated. The LT4295 can be configured with an LT4320-based ideal diode bridge to recover the diode voltage drop and ease thermal design. For applications with auxiliary input voltages below 10V, the LT4295 must be configured with an LT4320-based ideal diode bridge to recover the voltage drop and guaran- tee the minimum VPORT voltage is within the VPORT AUX range as specified in the Electrical Characteristics table. Input Capacitor A 0.1μF capacitor is needed from V PORT to GND to meet the input impedance requirement in IEEE 802.3 and to properly bypass the LT4295. When operating with the LT4321, locally bypass each with a 0.047μF capacitor , thus keeping the total port capacitance within specification. T ransient Voltage Suppressor The LT4295 specifies an absolute maximum voltage of 100V and is designed to tolerate brief overvoltage events due to Ethernet cable surges. To protect the LT4295 from an overvoltage event, install a unidirectional transient volt- age suppressor (TVS) such as an SMAJ58A between the VPORT and GND pins. For PD applications that require an auxiliary power input, install a TVS between VIN and GND. For extremely high cable discharge and surge protection, contact Analog Devices Applications.

Rev. B For more information www.analog.com TYPICAL APPLICATIONS 13W PoE Power Supply in Flyback Mode with 5V, 2.3A Output Efficiency vs Load Current VOUT vs Load Current +VOUT 5V AT 2.3A –VOUT L1: COILCRAFT , DO1813P-181HC L2: COILCRAFT , DO1608C-103 L4: COILCRAFT , DO1608C-104 C2: 22µF , 6.3V , MURATA GRM31CR70J226KE19 C5: 47µF , 6.3V , PANASONIC 6SVP47M C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35 T1: WÜRTH, 750313109 Q1: PSMN075-100MSE T2: PCA EPA4271GE OR PULSE PE-68386NL VPORT GND 10µH 180nH 100µH 10µF 100V 10nF 100V 3.3k 10µF 10V HSSRC SWVCC FB31 PG SG ITHBROSCSFSTFFSDL YRCLASSGND VPORT L T4295 HSGATE ISEN ISEN– VIN VCC 2.2µF FDN86246 BAT54WS BAT46WS

4295 TA02a

1µF 6.04k 20/uni03A9 270/uni03A9 1/4W 11/uni03A9 1/4W 60m/uni03A9 1/4W 15/uni03A9 100/uni03A9 1µF 330pF0.1µF 107k5.23k52.3/uni03A9 8.2/uni03A9 PTVS58VP1UTP 4.7nF 2.2nF 2KV 20k 10k 2.2nF 22µF 47µF 6.3V 47pF 630V 0.1µF 100V 2.2nF 2kV BAV19WS

• • FMMT723 LOAD CURRENT (A) EFFICIENCY (%) 0.5 2.51 1.5 20

4295 TA02b

VPORT = 37V VPORT = 48V VPORT = 57V LOAD CURRENT (A) 4.80 VOUT (V) 5.15 5.10 5.05 5.00 4.95 4.90 4.85 5.20 0.5 2.51 1.5 20

4295 TA02c

VPORT = 37V VPORT = 48V VPORT = 57V

Rev. BFor more information www.analog.com TYPICAL APPLICATIONS 40W PoE Power Supply in Flyback Mode with 12V, 3A Output Efficiency vs Load Current VOUT vs Load Current +VOUT 12V AT 3A –VOUT 10µH 180nH 100µH 10µF 100V 10nF 100V 3.3k 24V 8.2/uni03A9 10µF 10V HSSRC SWVCC FB31 PG SG T2P ITHBROSCSFSTFFSDL YRCLASSRCLASS++GND VPORT L T4295 HSGATE ISEN ISEN– VIN VCC 2.2µF BSZ90020NS3 BAT54WS BAT46WS MOC207M VOUT TO MICROPROCESSOR

4295 TA03a

1µF 6.65k 2.00k/uni03A9 100/uni03A9 1/2W 11/uni03A9 1/2W 25m/uni03A9 1/4W 15/uni03A9 100/uni03A9 1µF 220pF 0.1µF 107k 7.5k37.4/uni03A9 1.00k/uni03A9PTVS58VP1UTP 3.3nF 2.2nF 2KV 26.1k 10k 2.2nF C2, C3 10µF 33µF 100pF 630V 47nF 100V 2.2nF 2kV BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 47nF 100V L1: COILCRAFT , DO1813P-181HC L2: COILCRAFT , DO1608C-103 L4: COILCRAFT , DO1608C-104 C2, C3: 10µF , 16V , MURATA GRM31CR61C106KA88 C5: 33µF , 25V , PANASONIC EEHZA1E330R C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35 T1: WÜRTH, 750316115 OR PCA EPC3634G Q1-Q9: PSMN075-100MSE T2: PCA EPA4271GE OR PULSE PE-68386NL J1: WURTH 7499511001A BAV19WS 5.1k/uni03A9 10k 20/uni03A9

• • FMMT723 +VOUT 12V AT 3A –VOUT 10µH 180nH 100µH 10µF 100V 10nF 100V 3.3k 24V 8.2/uni03A9 10µF 10V HSSRC SWVCC FB31 PG SG T2P ITHBROSCSFSTFFSDL YRCLASSRCLASS++GND VPORT L T4295 HSGATE ISEN ISEN– VIN VCC 2.2µF BSZ90020NS3 BAT54WS BAT46WS MOC207M VOUT TO MICROPROCESSOR

1µF 6.65k 2.00k/uni03A9 100/uni03A9 1/2W 11/uni03A9 1/2W 25m/uni03A9 1/4W 15/uni03A9 100/uni03A9 1µF 220pF 0.1µF 107k 7.5k37.4/uni03A9 1.00k/uni03A9PTVS58VP1UTP 3.3nF 2.2nF 2KV 26.1k 10k 2.2nF C2, C3 10µF 33µF 100pF 630V 47nF 100V 2.2nF 2kV BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 47nF 100V L1: COILCRAFT , DO1813P-181HC L2: COILCRAFT , DO1608C-103 L4: COILCRAFT , DO1608C-104 C2, C3: 10µF , 16V , MURATA GRM31CR61C106KA88 C5: 33µF , 25V , PANASONIC EEHZA1E330R C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35 T1: WÜRTH, 750316115 OR PCA EPC3634G Q1-Q9: PSMN075-100MSE T2: PCA EPA4271GE OR PULSE PE-68386NL J1: WURTH 7499511001A BAV19WS 5.1k/uni03A9 10k 20/uni03A9

• • FMMT723 VPORT = 44V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 0.5 1.5 2.5 EFFICIENCY (%)

4295 TA03b

VPORT = 44V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 0.5 1.5 2.5 11.98 12.00 12.02 12.04 12.06 12.08 12.10 12.12 12.14 V (OUT) (V)

4295 TA03c

Rev. B For more information www.analog.com TYPICAL APPLICATIONS Efficiency vs Load Current VOUT vs Load Current 71.3W PoE Power Supply in Forward Mode with 5V, 13A Output CSFST (µF) t SFST (ms) 0.10 1.2 0.33 3.8 1.0 12 3.3 38 10nF 100V 3.3k 100µH 10µF 10V BAV19WS FMMT723 8.2/uni03A9 PTVS58VP1UTP 0.1µF 100V 2.2µH 100µF (×2) 100µF 6HVA100M 4.9µH 22µF 100V HSSRC SWVCC FFSDL Y PG SG ITHBROSCSFSTRCLASS++RCLASSGND FB31 T2P VPORT L T4295 HSGATE ISEN ISEN– VIN VCC VCC +VOUT +VOUT +5V AT 13A –VOUTVCC 2.2µF (×2) BAT54WS BSC190N12NS3

4295 TA04a

4.7n ZR43110k 10.0k 10.0k 10/uni03A9 10/uni03A9 CMMSH1-40L BSC054N04NSBSC054N04NS CMMSH1-40L CMMSH1-40L 8.2V CMHZ4694 18V CMHZ5248B 18V CMHZ5248B 2.2nF 2kV 33nF 0.1µF 0.1µF 10k 0.1µF FDMC2523P CMMSH1-40L M0C207M MMBT3904 VPORT GND 13k 20/uni03A9 52.3/uni03A9118/uni03A9 0.47µF 100pF 100k107k

• • L1: COILCRAFT , XAL-1010-222ME L2: WÜRTH, 744314490 L4: COILCRAFT , DO1608C-104 C5, 100µF , 6.3V , SUNCON 6HVA100M C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35L C8: 100µF , 6.3V , SUNCON 6HVA100M T1: WÜRTH, 750313095 Q1: PSMN040-100MSE TO MICROPROCESSOROPTO 10nF VPORT = 41V VPORT = 50V VPORT = 57V LOAD CURRENT (A) EFFICIENCY (%)

4295 TA04b

VPORT = 41V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 V (OUT) (V)

4295 TA04c

Rev. BFor more information www.analog.com Efficiency vs Load Current VOUT vs Load Current TYPICAL APPLICATIONS 71.3W PoE Power Supply in Forward Mode with 12V, 5.5A Output CSFST (µF) t SFST (ms) 0.10 1.5 0.33 4.9 1.0 15 3.3 48 6.5µH 22µF 100V HSSRC SWVCC FFSDL Y PG SG ITHBROSCSFSTRCLASS++RCLASSGND FB31 T2P VPORT L T4295 HSGATE ISEN+ ISEN– VIN VCC VCC +VOUT +VOUT +12V AT 5.5A –VOUT VCC 2.2µF (×2) BAT54WS BSC190N12NS3

4295 TA05a

250V0.22µF 250V 750/uni03A9 820/uni03A9 20k ZR431 10k 10.0k 100pF 38.3k 13k 10/uni03A9 CMMSH1-60 BSC123N08S3 BSC123N08S3 CMMSH1-100 CMMSH1-100 13V CMHZ4700 7.5V CMHZ5236B 2.2nF 2kV 6.8nF 0.1µF 0.1µF 10k 0.1µF FDMC2523P CMMSH1-40L M0C207M MMBT3904 29.4k VCC BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 52.3/uni03A9 118/uni03A9 1µF 100pF 100pF 100k107k 330pF 20/uni03A9 • • 7.5/uni03A9 10nF 100V47nF 100V 3.3k 100µH 10µF 10V 8.2/uni03A9 PTVS58VP1UTP 47nF 100V 8.2µH 22µF 16V (×2) C8 100µF L1: COILCRAFT , XAL-1010-822ME L2: WÜRTH, 744314650 L4: COILCRAFT , DO1608C-104 C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35L C8: 100µF , 16V , SUNCON 16HVA100M T1: PCA EPC3577G-LF T2: WÜRTH, 749022016 Q1: PSMN040-100MSE Q2-Q9: PSMN075-100MSE TO MICROPROCESSOROPTO FMMT723 820pF 100pF +VOUT +VOUT 7.5V CMHZ5236B 5.1k FMMT624 FMMT624 5.1k 100pF BAV19WS VPORT = 41V VPORT = 50V VPORT = 57V LOAD CURRENT (A) EFFICIENCY (%)

4295 TA05b

VPORT = 41V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 11.60 11.70 11.80 11.90 12.00 12.10 12.20 12.30 12.40 V (OUT) (V)

4295 TA05c

Rev. B For more information www.analog.com TYPICAL APPLICATIONS 40W PoE Power Supply in Flyback Mode with 5V, 7.3A Output Efficiency vs Load Current VOUT vs Load Current +VOUT 5V AT 7.3A –VOUT L1: COILCRAFT , DO1813P-181HC L2: COILCRAFT , DO1608C-103 L4: COILCRAFT , DO1608C-104 C2, C3: 47µF , 6.3V , GRM31CR60J476ME19L C5: 47µF , 6.3V , PANASONIC 6SVP47M C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35L T1: WÜRTH, 750314783 OR PCA EPC3586G Q1-Q9: PSMN075-100MSE T2: PCA EPA4271GE OR PULSE PE-68386NL J1: WURTH 7499511001A 10µH 180nH 100µH 10µF 100V 10nF 100V47nF 100V 3.3k 24V 8.2/uni03A9 10µF 10V HSSRC SWVCC FB31 PG SG T2P ITHBROSCSFSTFFSDL YRCLASS++RCLASS GND VPORT L T4295 HSGATE ISEN ISEN– VIN VCC 2.2µF BSZ900N20 NS3G BAT54WS BAT46WS TO MICROPROCESSOR

4295 TA06a

1µF 5.90k 2.00k/uni03A9 80/uni03A9 1/4W 5.1/uni03A9 1/4W 40m/uni03A9 1/4W 15/uni03A9 100/uni03A9 20/uni03A9 1µF 220pF0.1µF 107k7.50k RLDCMP 51k 37.4/uni03A9 1.00k/uni03A9PTVS58VP1UTP 3.3nF 2.2nF 2KV 20k 10k 2.2nF C2, C3 47µF||47µF 47µF 100pF 100V 47nF 100V 2.2nF 2kV OPTO BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 BAV19WS

• • FMMT723 VPORT = 50V VPORT = 57V LOAD CURRENT (A) EFFICIENCY (%)

4295 TA06b

VPORT = 50V VPORT = 57V LOAD CURRENT (A) 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 V (OUT) (V)

4295 TA06c

Rev. BFor more information www.analog.com TYPICAL APPLICATIONS25.5W PoE and 9V to 57V Auxiliary Input Power Supply in Flyback Mode with 12V, 1.9A Output Efficiency vs Load Current VOUT vs Load Current +VOUT 12V AT 1.9A –VOUT L1: COILCRAFT , DO1813P-561ML L2: WÜRTH, 7443330820 L3: MURATA, LQM21PN2R2NGCD L4: COILCRAFT , DO1813H-223 C2, C3: 10µF , 16V , MURATA GRM31CR61C106KA88 C5: 33µF , 20V , KEMET , T494V336M020AS C7, C8: 3.3µF , 100V , TDK C3225X7S2A335M T1: PCA EPC3601G OR WÜRTH 750315422 Q1-Q9:PSMN075-100MSE T2: PCA EPA4271GE OR PULSE PE-68386NL J1: WURTH 7499511611A 8.2µH 2.2µH 1µF 680µF 560nH 22µH 10µF 100V 100nF 100V 0.1µF 3.3k 158k 931k24V 47nF 100V 8.2/uni03A9 22µF 10V PMEG10010ELR HSSRC SWVCC FB31 PG SG T2P ITHBROSCSFSTFFSDL YRCLASSGND VPORT AUX L T4295 HSGATE ISEN ISEN– VIN VCC C7, C8 3.3µF FDMC86160 BAT54WS BAT46WS TO MICROPROCESSOR

4295 TA07a

1µF 4.75k 2.00k 62/uni03A9 1/4W 82/uni03A9||82/uni03A9 1/4W 15m/uni03A9 1/2W 15/uni03A9 100/uni03A9 1µF 220pF0.1µF 107k9.31k RLDCMP 51k35.7/uni03A9 PTVS58VP1UTP 4.7nF 2.2nF 2KV 43k 10k 2.2nF C2, C3 10µF||10µF 33µF 100pF 100V 47nF 100V 2.2nF 2kV OPTO BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 TG2 TG1 OUTP OUTN IN1 IN2 BG2 BG1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 L T4320 BSZ110N06NS3 x4 MMSD4148 x3 VAUX 9V TO 57VDC OR 24VAC 1/uni03A9

• • FMMT723 V AUX = 9V V AUX = 24V V AUX = 42.5V V AUX = 57V LOAD CURRENT (A) 0.5 1.5 EFFICIENCY (%)

4295 TA07b

V AUX = 9V V AUX = 24V V AUX = 42.5V V AUX = 57V LOAD CURRENT (A) 0.5 1.5 11.50 11.75 12.00 12.25 12.50 V (OUT) (V)

4295 TA07c

Rev. B For more information www.analog.com TYPICAL APPLICATIONS25.5W PoE Power Supply in Flyback Mode with 3.3V, 6.8A Output Efficiency vs Load Current VOUT vs Load Current +VOUT 3.3V AT 6.8A –VOUT L1: COILCRAFT , DO1813P-181HC L2: COILCRAFT , DO1608C-103 L4: COILCRAFT , DO1608C-104 C2, C3: 22µF , 6.3V , MURATA GRM31CR70J226KE19 C5: 68µF , 4V , 4SVPA68MAA C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35 T1: WÜRTH, 750310743 OR PCA EPC3408G Q1-Q9: PSMN075-100MSE T2: PCA EPA4271GE OR PULSE PE-68386NL J1: WURTH 7499511001A 10µH 180nH 100µH 10µF 100V 10nF 100V 47nF 100V 3.3k 24V 8.2/uni03A9 10µF 10V HSSRC SWVCC FB31 PG SG T2P ITHBROSCSFSTFFSDL YRCLASSGND VPORT L T4295 HSGATE ISEN ISEN– VIN VCC 2.2µF BSZ900N20NS3 BAT54WS BAT46WS TO MICROPROCESSOR

4295 TA08a

1µF 6.49k 100/uni03A9 1/4W 5.1/uni03A9 1/4W 40m/uni03A9 1/4W 15/uni03A9 100/uni03A9 1µF 470pF 0.1µF 107k6.81k35.7/uni03A9PTVS58VP1UTP 4.7nF 2.2nF 2KV 8.25k 10k 2.2nF C2, C3 22µF||22µF 68µF 100pF 100V 47nF 100V 2.2nF 2kV OPTO BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 B0540WS BAV19WS 20/uni03A9

• • FMMT723 VPORT = 42.5V VPORT = 50V VPORT = 57V LOAD CURRENT (A) EFFICIENCY (%)

4295 TA08b

VPORT = 42.5V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 3.20 3.30 3.40 3.50 V (OUT) (V)

4295 TA08c

Rev. BFor more information www.analog.com TYPICAL APPLICATIONS25.5W PoE Power Supply in Flyback Mode with 24V, 0.95A Output Efficiency vs Load Current VOUT vs Load Current +VOUT 24V AT 0.95A –VOUT L2: COILCRAFT , DO1608C-103 L4: COILCRAFT , DO1608C-104 C2: 4.7µF , 50V , MURATA GRM31CR71H475KA12 C5: 22µF , 35V , PANASONIC EEH-ZA1V220R C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35 T1: WÜRTH, 750314782 OR PCA EPC3603G Q1-Q9: PSMN075-100MSE T2: PCA EPA4271GE OR PULSE PE-68386NL J1: WURTH 7499511001 10µH 100µH 10µF 100V 10nF 100V 3.3k 24V 8.2/uni03A9 10µF 10V HSSRC SWVCC FB31 PG SG T2P ITHBROSCSFSTFFSDL YRCLASSGND VPORT L T4295 HSGATE ISEN ISEN– VIN VCC 2.2µF BSZ520N15NS3G BAT54WS BAT46WS TO MICROPROCESSOR

4295 TA09a

0.1µF 6.49k 2.00k/uni03A9 20/uni03A9 100/uni03A9 1/4W 120/uni03A9||120/uni03A9 1/4W 40m/uni03A9 1/4W 15/uni03A9 100/uni03A9 1µF 10pF0.47µF 107k5.23k RLDCMP 24k35.7/uni03A9PTVS58VP1UTP 3.3nF 2.2nF 2KV 160k 10k 2.2nF C2, C3 4.7µF 50V 22µF 47pF 100V 47nF 100V 2.2nF 2kV OPTO BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 47nF 100V BAV19WS

• • FMMT723 VPORT = 42.5V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 0.2 0.4 0.6 0.8 EFFICIENCY (%)

4295 TA09b

VPORT = 42.5V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 0.2 0.4 0.6 0.8 23.4 23.6 23.8 24.0 24.2 24.4 24.6 V (OUT) (V)

4295 TA09c

Rev. B For more information www.analog.com TYPICAL APPLICATIONS 62W PoE Power Supply in Flyback Mode with 24V, 2.4A Output Efficiency vs Load Current VOUT vs Load Current +VOUT 24V AT 2.4A –VOUT L1: COILCRAFT , DO1813H-122ML L2: WURTH, 744314490 L4: COILCRAFT , DO1608C-104 C2: MURATA GRM32ER61H106K C5: 47µF , 35V , EEE-FT1V470AR C7, C8: 2.2µF , 100V , MURATA GRM32ER72A225KA35 Q1: NXP PSMN040-100MSE Q2-Q9: PSMN075-100MSE T1: PCA EPC3630G OR WURTH 750316231 T2: PCA EPA4271GE OR PULSE PE-68386NL J1: WURTH 749022016L2 4.9µH 100µH 1.2µH 22µF 100V 10nF 100V 3.3k 24V 8.2/uni03A9 10µF 10V HSSRC SWVCC FB31 PG SG T2P ITHBROSCSFSTFFSDL YRCLASS ++ RCLASSGND VPORT L T4295 HSGATE ISEN+ ISEN– VIN VCC C7, C8 2.2µF BSC190N15NS3 BAT54WS BAT46WS TO MICROPROCESSOR

4295 TA10a

0.1µF 3.74k 2.00k/uni03A9 20/uni03A9 27/uni03A9 1/2W 18/uni03A9 15m/uni03A9 1/2W 15/uni03A9 100/uni03A9 1µF 330pF0.47µF 107k5.23k RLDCMP 36k80.6/uni03A9 64.9/uni03A9 PTVS58VP1UTP 10nF 2.2nF 2KV 22k 10k 2.2nF 10µF 50V 47µF 220pF 100V 47nF 100V 4.7nF 2kV OPTO BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 47nF 100V BAV19WS

• • FMMT723 VPORT = 41V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 0.5 1.5 2.5 EFFICIENCY (%)

4295 TA10b

VPORT = 41V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 0.5 1.5 2.5 24.0 24.1 24.2 24.3 24.4 24.5 V (OUT) (V)

4295 TA10c

Rev. BFor more information www.analog.com TYPICAL APPLICATIONS 71.3W PoE Power Supply in Forward Mode with 24V, 2.7A Output 6.5µH 22µF 100V HSSRC SWVCC FFSDL Y PG SG ITHBROSCSFSTRCLASS++RCLASSGND FB31 T2P VPORT L T4295 HSGATE ISEN+ ISEN– VIN VCC VCC +VOUT +VOUT +VOUT 24V AT 2.7A –VOUT VCC 2.2µF (×2) BAT54WS BSC190N12NS3

4295 TA11a

820/uni03A9 1.2k ZR431 10k 10.0k 1nF 86.6k 10k TPH5900CNH TPH5900CNH SMD1200PL-TP SMD1200PL-TP 13V CMHZ4700 7.5V CMHZ5236B 2.2nF 2kV 6.8nF 0.1µF 10k 0.1µF FDMC2523P CMMSH1-40L M0C207M MMBT3904 33k VCC BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 52.3/uni03A9 118/uni03A9 1µF 100pF 100k107k 3.3nF 20/uni03A9 • • 47/uni03A9 10nF 100V47nF 100V 3.3k 100µH 10µF 10V 8.2/uni03A9 PTVS58VP1UTP 47nF 100V 22µH 10µF 35V C1 47µF 35V L1: PULSE PA2050.223 L2: WÜRTH, 744314650 L4: COILCRAFT , DO1608C-104 C1: PANASONIC EEHZA1V470P C2: MURATA GRM32ER6YA106KA12 C7: 2.2µF , 100V , MURATA GRM32ER72A225KA35L Q1: PSMN040-100MSE Q2-Q9: PSMN075-100MSE T1: PCA EPC3636G T2: WÜRTH, 749022016 TO MICROPROCESSOROPTO FMMT723 220pF 47pF +VOUT +VOUT 7.5V CMHZ5236B 13k FMMT624 FMMT624 13k 47pF BAV19WS CSFST (µF) t SFST (ms) 0.10 1.4 0.22 2.4 0.47 4.4 1.0 15 3.3 46 VOUT vs Load CurrentEfficiency vs Load Current VPORT = 41V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 0.5 1.5 2.5 EFFICIENCY (%)

4295 TA11b

VPORT = 41V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 0.5 1.5 2.5 23.0 23.4 23.8 24.2 24.6 25.0 V (OUT) (V)

4295 TA11c

Rev. B For more information www.analog.com PACKAGE DESCRIPTION 4.00 ±0.10 (2 SIDES)

2.50 REF

5.00 ±0.10 (2 SIDES) NOTE: 1. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGHD-3). 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT , SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONL Y A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE PIN 1 TOP MARK (NOTE 6) 0.40 ±0.10 27 28 BOTTOM VIEW—EXPOSED PAD

3.50 REF

0.75 ±0.05 R = 0.115 TYP R = 0.05 TYP PIN 1 NOTCH R = 0.20 OR 0.35 × 45° CHAMFER 0.25 ±0.05

0.50 BSC

0.200 REF

0.00 – 0.05 (UFD28) QFN 0816 REV C RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPL Y SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 0.70 ±0.05 0.25 ±0.05 4.10 ±0.05 5.50 ±0.05 2.65 ±0.05 3.10 ±0.05 4.50 ±0.05 PACKAGE OUTLINE 2.65 ±0.10 3.65 ±0.10 3.65 ±0.05 28-Lead Plastic QFN (4mm × 5mm) (Reference LTC DWG # 05-08-1712 Rev C)

Rev. BFor more information www.analog.com Information furnished by Analog Devices is believed to be accurate and reliable. However , no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

REVISION HISTORY

REV DATE DESCRIPTION PAGE NUMBER A 09/18 Updated max input power to 71.3W per Draft 3.4 Revised T2P Output, PoE Input Bridge, Input Capacitor , and T ransient Voltage Supressor Applications Information Changed RCLASS and/or RCLASS++ resistor values Added J1 transformer recommendations 1-30 12, 17 20, 26 19, 22-26, 30 B 5/19 Removed Draft number Added Table 5–Interoperability 1-30

Rev. B For more information www.analog.com  ANALOG DEVICES, INC. 2016–2019 www.analog.com RELATED PARTS TYPICAL APPLICATION PART NUMBER DESCRIPTION COMMENTS LT4293 L TPoE++/IEEE 802.3bt PD Interface Mutually identifies with L TPoE++ and IEEE 802.3bt PSEs LT4294 IEEE 802.3bt PD Controller External Switch, IEEE 802.3bt and AUX Support LT4320/LT4320-1 Ideal Diode Bridge Controller 9V-72V, DC to 600Hz Input. Controls 4-NMOSFETs, Voltage Rectification without Diode Drops LT4321 PoE Ideal Diode Bridge Controller Controls 8-NMOSFETs for IEEE-required PD Voltage Rectification without Diode Drops LTC4292/LTC4291-1 4-Port IEEE 802.3bt PSE Controller T ransformer Isolation, Supports IEEE 802.3bt PDs 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 Forward Switching Regulator 2-Event Classification, Programmable Class, Synchronous Forward Controller , 100kHz to 500kHz, Aux Support LT4275A/B/C L TPoE++/PoE+/PoE PD Controller External Switch, L TPoE ++ Support LT4276A/B/C L TPoE++/PoE+/PoE PD with Forward/ Flyback Switching Regulator Controller External Switch, L TPoE++ Support, User-Configurable Class, Forward or No-Opto Flyback Operation, Frequency, PG/SG Delays, Soft-Start, and Aux Support as Low as 9V, Incl Housekeeping Buck, Slope Compensation 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 51W PoE Power Supply in Flyback Mode with 12V, 3.9A Output Efficiency vs Load Current VOUT vs Load Current +VOUT 12V AT 3.9A –VOUT C5: 47µF , 35V , PANASONIC EEHZA1V470P C7, C8: 2.2µF , 100V , MURATA GRM32ER72A225KA35 T1: WÜRTH, 750316116 OR PCA EPC3633G T2: PCA EPA4271GE OR PULSE PE-68386NL Q1: PSMN040-100MSE Q2-Q9: PSMN075-100MSE L1 100µH 10nF 100V 3.3k 24V 8.2/uni03A9 10µF 10V HSSRC SWVCC FB31 PG SG T2P ITHBROSCSFSTFFSDL YRCLASSRCLASS++GND VPORT L T4295 HSGATE ISEN ISEN– VIN VCC TPH1500CNH BAT54WS BAT46WS MOC207M VOUT TO MICROPROCESSOR

4295 TA12a

1µF 5.62k 2.00k/uni03A9 36/uni03A9 1/2W 20/uni03A9 1/2W 20m/uni03A9 1/2W 15/uni03A9 100/uni03A9 1µF 330pF0.1µF 107k5.23k47.5/uni03A9 150/uni03A9 PTVS58VP1UTP 3.3nF 2.2nF 2KV 30k 10k 2.2nF C2, C3 10µF 47µF 220pF 630V 47nF 100V 2.2nF 2kV BG36 L T4321 BG12 TG12 TG36 TG78TG45 BG45 BG78 OUTP OUTN EN EN IN12 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 DATA PAIRS SPARE PAIRS IN36 IN45 IN78 47nF 100V L1: WURTH 744316022 L2: WURTH 744316470 L4: COILCRAFT , DO1608C-104 C2, C3: 10µF , 16V , MURATA GRM32DR61C106KA01 J1: WURTH 7499511001A BAV19WS 5.1k/uni03A9 10k 20/uni03A9

• • 4.7µH + 10µF 100V C7, C8 2.2µF FMMT723 VPORT = 42.5V VPORT = 50V VPORT = 57V LOAD CURRENT (A) 11.94 11.95 11.96 11.97 11.98 11.99 12.00 12.01 12.02 V (OUT) (V)

4295 TA12c

VPORT = 42.5V VPORT = 50V VPORT = 57V LOAD CURRENT (A) EFFICIENCY (%)

4295 TA12b