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15W Power Over Ethernet PoE Powered Device (PD) Controller MP8001 Rev. 1.0 www.MonolithicPower.com 1 12/12/2011 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. The Future of Analog IC Technology
DESCRIPTION
The MP8001 is an IEEE 802. 3 af POE compliant Powered Device (PD) controller. It includes detection and classification modes as well as a 100V output pass device having a temperature compensated current limit over the specified temperature range. Thermal protection is built in to accommodate both transient and/or overload conditions, shutting the part down and protecting the input source as well as the output load depending on the particular fault conditions. Inrush current limiting is included to slowly charge the input capacitor without interruption due to die heating, a problem encountered without the current limit foldback feature. EVALUATION BOARD REFERENCE Board Number Dimensions EV8001DS-00A 2.8”x1.7”x0.8” ( LxWxH)
FEATURES
Meets IEEE 802. 3 af Specifications 100V, 1 Ω Integrate DMOS Device 460mA max, Current Limit Open Drain Power Good Output 8 pin SOIC and TSSOP Packages
APPLICATIONS
VoIP Telephones Network Cards Security Camera Systems Safety Backup Power Remote Internet Power All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. ADAM (Analog Digital Adaptive Modulation) and AAM (Advanced Asynchronous Mode) are trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION
MP8001 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER MP8001 Rev. 1.0 www.MonolithicPower.com 2 12/12/2011 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking Free Air Temperature (TA) MP8001DS SOIC8 -40C to +85C * For Tape & Reel, add suffix –Z (e.g. MP8001DS–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP8001DS–LF–Z) PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS (1) I Continuous Power Dissipation(TA = +25°C) (2) Recommended Operating Conditions (3) Thermal Resistance (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature T J (MAX), the junction-to- ambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX) = (T J (MAX)-TA)/θJA. Exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. ILIM CLASS DET VSS VDD NC PG RTN TOP VIEW MP8001_PD01
MP8001 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER MP8001 Rev. 1.0 www.MonolithicPower.com 3 12/12/2011 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VDD = 48V, all voltages with respect to VSS, VSS = 0V; RDET = 26.1kΩ, RCLASS = 4.42KΩ, RILIM = 178kΩ, TA = 25C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Detection Detection on V DET_ON V DD=VRTN=VPG=1.9V 1.9 V Detection off V DET_OFF V DD=VRTN=VPG=11V 11 V Detection on/off Hysteresis VDET_H Falling below 11V on Threshold 0.2 V DET Leakage Current V DET_LK V DET=VVDD=57V, Measure IDET 0.1 5 μA VDD= 3V 135 140 145 μA Detection Current I DET VVDD=VRTN RDET=26.1kΩ, Measure IVDD+IRTN+IDET VDD= 10.1V 405 420 435 μA Classification VCLASS Output Voltage V CL Over a Load Range of 1mA to 41.2 mA 9.6 10 10.3 V RCLASS=4420Ω, 13≤VVDD≤21V (guar by VCL) 2.2. 2.4 2.8 RCLASS=953Ω, 13≤VVDD≤21V (guar by VCL) 10.3 10.6 11.3 RCLASS=549Ω, 13≤VVDD≤21V (guar by VCL) 17.7 18.3 19.5 RCLASS=357Ω, 13≤VVDD≤21V (guar by VCL) 27.1 28 29.5 Classification Current I CLASS RCLASS=255Ω, 13≤VVDD≤21V (guar by VCL) 38 39.4 41.2 mA Classification Lower Threshold VCL_ON Regulator Turns on, V VDD Rising 10.2 11.3 13 V Classification Upper Threshold VCU_OFF Regulator Turns off, V VDD Rising 21 21.9 23 V V CU_H Hysteresis 0.4 V IC Supply Current during Classification IIN_CLASS VDD = 17.5V, CLASS Floating, RTN Tied to VSS 300 500 μA Leakage Current I LEAKAGE V CLASS = 0 V, VVDD = 57V 1 μA Pass Device On Resistance R DS(ON) I RTN=300mA 1.0 1.2 Ω Leakage Current I SW_LK V VDD=VRTN=57V 1 15 μA Current Limit I LIMIT V RTN=1V 380 420 460 mA Inrush Limit I INRUSH V RTN=2V, RILM=178kΩ 120 150 180 mA PG Latchoff Voltage Threshold Rising V RTN Rising (5) 9.5 10 10.5 V Latchoff Voltage Threshold Falling V RTN Falling (5) 1.2 V PG Deglitch Delay Rising and Falling PDG (5) 75 150 225 μs Output Low Voltage I PG = 400 μA 0.12 0.4 V
MP8001 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER MP8001 Rev. 1.0 www.MonolithicPower.com 4 12/12/2011 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS(continued) VDD = 48V, all voltages with respect to VSS, VSS = 0V; RDET = 26.1kΩ, RCLASS = 4.42KΩ, RILIM = 178kΩ, TA = 25C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Leakage Current V PG = 57 V, VRTN = 0 V 0.1 1 μA UVLO V VDD Rising (including 1.4V Diode drop) 38 40 42 Voltage at VVDD V VDD Falling (including 1.4V Diode drop) 30.2 31.5 32.8 V Thermal Shutdown Thermal Shut down Temperature TRISE Temperature Rising 135 ºC Hysteresis T HYS 40 ºC Thermal Shut down Counter TCOUNT Events Prior to Latch off (5) 8 counts Thermal Counter Reset Voltage VCRST Must Drop below Classification Range (5) 10.8 V Bias Current Operating Current I Q(VDD) VDD = 48V, Pins 5, 6 Floating Measure IVDD 240 450 μA Notes: 5) Guaranteed by Design.
MP8001 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER MP8001 Rev. 1.0 www.MonolithicPower.com 5 12/12/2011 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 ILIM Startup I LIM Value Set (optional at this point). 2 CLASS Classification Resistor. 3 DET 26.1k Ω Detection Resistor. 4 VSS Negative Power Supply Terminal. 5 RTN Powered Device Negative Power Terminal. 6 PG Power Good Indicator. 7 NC No Connect. Possible post-package trim input. 8 VDD Positive Power Supply Terminal. OPERATION The MP8001 operates in the manner described here and in the IEEE 802.3af Powered Device (PD) Specifications. This device (along with the power sourcing element (PSE)) operates as a safety device to supply potentially lethal voltages only when the power sourcing element recognizes a unique, tightly specified resistance at the end of an unknown length of Ethernet cable. A 25kΩ resistance is presented as a load to the PSE in Detection Mode, when the PSE applies two “safe” voltages of less than 10.1V each while measuring the change in current drawn in order to determine the load resistance. If the PSE “sees” the correct load, then it may either further increase the applied voltage to enter the “classification” range of operation or switch on the nominal 48V power to the load. The classification mode can further specify to the PSE the expected load range of the device under power so that the PSE can intelligently distribute power to as many loads as possible (within its maximum current capabilities). If a classification resistance is not present, the PD load is assumed to be the maximum of approximately 13 Watts. The classification mode is active between 14.5V and 20.5V. The main power switch will pass a limited current above 31V, charging the external DC-to-DC converter’s input capacitor in a controlled manner. The charging will continue until the controlled current drops below the either an externally programmed limiting level or 450mA, depending upon the Rlim current setting resistor. The main power switch is internally thermally protected to 100V by reducing the output current using a foldback technique. The required power dissipation of the IC drops from the allowed peak value of 26W (450mA x 57V) to 0.16W ((450mA) 2 x RON) during the normal operation at turn-on. The minimum allowed capacitance of 5µF will charge in 500µs. A larger capacitor will take a proportionally longer time to charge due to the constant current charging method. If a. A capacitor that is too large will overheat the part and force it into thermal shutdown. The IC will reattempt charging for a number of cycles but ultimately will be shut down until the input voltage from the PSE is recycled. This is the way the IC protects itself under overload and/or shorted conditions.
MP8001 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER MP8001 Rev. 1.0 www.MonolithicPower.com 6 12/12/2011 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. BLOCK DIAGRAM DETECTION 2.7V - 10.1V CLASSIFICATION 14.5V - 20.5V Enable Chip CONTROL LOGIC AND GATE DRIVE RTN PG VDD DET ILIM CLASS Optional Classification Resistor MP8001_F01_BD02 Startup Resistor VSS RSENSE HV HV VSTARTUP VIN Figure 1—PD Block Diagram
MP8001 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER MP8001 Rev. 1.0 www.MonolithicPower.com 7 12/12/2011 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.
PACKAGE INFORMATION
MP8001 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER NOTICE: The information in this document is subject to change wi thout notice. Please contact M PS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights ar e not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP8001 Rev. 1.0 www.MonolithicPower.com 8 12/12/2011 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. TSSOP8 PACKAGE OUTLINE DRAWING FOR 8-TSSOP MF-PO-D-0038 revision 0.0 NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING CONFORMS TO JEDEC MO-153, VARIATION AA. 6) DRAWING IS NOT TO SCALE. 0.19 0.30 2.90 3.10 SEATING PLANE 0.65 BSC PIN 1 ID 4.30 4.50 6.20 6.60 0.80 1.05 1.20 MAX 0.05 0.15 TOP VIEW FRONT VIEW SIDE VIEW 0.09 0.20 RECOMMENDED LAND PATTERN 5.80 TYP 1.60 TYP 0.40 TYP 0.65 BSC SEE DETAIL "A" DETAIL 揂 0.45 0.750o-8o