19-2420; Rev 0; 4/02 Dual PCI 2.2 Hot-Swap Controllers Features ♦ PCI 2.2 Compliant The MAX5915/MAX5916 provide independent power controls for +3.3V, +5V, ±12V, and +3.3V auxiliary supplies of two PCI cards. The MAX5915/MAX5916 provide intelligent selective thermal shutdown control that shuts down the channel with an overcurrent fault. Both the MAX5915 and MAX5916 include internal power MOSFETs for the +12V, -12V, and +3.3V auxiliary outputs. The MAX5915/MAX5916 use internal charge pumps to activate the gates of the internal FETs controlling the +3.3V auxiliary supply. Internal FETs and currentsense circuitry regulate the ±12V and the +3.3V auxiliary supplies. Channels A and B operate independently, allowing a single MAX5915/MAX5916 to monitor two PCI card slots. ♦ Separate ON/OFF Control Input for Each Channel ♦ Independent Power Controls for +3.3V, +5V, ±12V, and +3.3V Auxiliary Supplies of Two PCI Cards ♦ Internal MOSFET Switches for ±12V and +3.3V Auxiliary Outputs ♦ Independent +3.3V Auxiliary Output ON/OFF Control ♦ Overcurrent Foldback with Timeout and Shutdown Protection for ±12V and +3.3V Auxiliary Rails with Status Report ♦ Brick Wall with Timeout and Shutdown Protection for +5V and +3.3V Rails with Status Report ♦ Output Undervoltage Monitoring for +3.3V, +5V, +12V, and +3.3V Auxiliary Rails with Status Report ♦ +3.3V Auxiliary Autorestart The MAX5915 offers latched fault protection and the MAX5916 offers autorestart fault protection. The devices are available in the low-profile 28-pin TSSOP package and are specified over the -40°C to +85°C extended temperature range. ♦ Intelligent Selective Thermal Shutdown Control Shuts Down Only the Channel with an Overcurrent Fault ♦ 28-Pin TSSOP Package Applications Ordering Information PCI 2.2 Server PCI Server FAULT MANAGEMENT PART RAID TEMP RANGE PINPACKAGE MAX5915EUI Latched -40°C to +85°C 28 TSSOP MAX5916EUI Autorestart -40°C to +85°C 28 TSSOP Pin Configuration, Functional Diagram, and Typical Operating Circuit appear at end of data sheet. Typical Application Circuit +3.3V FAIRCHILD FDS6670A 0.005Ω 470µF FAIRCHILD FDS6670A +5V 0.005Ω +12V 4.7µF 0.1µF -12V 4.7µF 0.1µF +3.3VAUX +12VIN -12VIN 3.3VAUXIN 4.7µF 0.1µF ON ON_ OFF 10kΩ 3.3VGATE_ 3.3VSEN_ 3.3VO_ 5VGATE_ 5VSEN_ 470µF 5VO_ +12VO_ -12VO_ 3.3VAUXO_ 47µF 47µF MAX5915 MAX5916 47µF 5V ON AUXON_ OFF 10kΩ GND PGOOD_ ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX5915/MAX5916 General Description The MAX5915/MAX5916 dual PCI 2.2 hot-swap controllers allow for safe insertion and removal of two PCI cards into live PCI slots or backplanes by limiting the inrush current at startup. After startup, the MAX5915/MAX5916 provide protection against shortcircuit, overcurrent, and undervoltage conditions. MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers ABSOLUTE MAXIMUM RATINGS +12VIN to GND ...................................................-0.3V to +14.0V -12VIN to GND........................................................-14V to +0.3V -12VO_ to GND......................................+0.3V to (V-12VIN - 0.3V) +12VO_, 3.3VGATE_, 5VGATE_ to GND..................................................-0.3V to (V+12VIN + 0.3V) Any Other Pin to GND ...........................................-0.3V to +6.0V Continuous Power Dissipation (TA = +70°C) 28-Pin TSSOP (derate 23.8mW/°C above +70°C) ...........1.9W Maximum Junction Temperature .....................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V-12VIN = -12V, V+12VIN = +12V, V3.3VAUXIN = +3.3V, VON_ = VAUXON_ = +5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 10.8 12 13.2 V 9.6 10 10.8 V POWER SUPPLIES Main Supply Input Voltage Range V+12VIN Main Supply Undervoltage Lockout (UVLO) V+12UVLO Main Supply UVLO Hysteresis VUVLO, HYS Main Input UVLO Delay Time tDEG, UVLO Supply Current V+12VIN rising 100 Figures 1 and 2 (Note 1) mV 1.6 IQ ms 2.5 5.0 mA +3.3V SUPPLY CONTROL Gate Charge Current I3.3VGATE_, CHG V3.3VGATE _ = +6V, V3.3VSEN_ = +3.3V, V3.3VO_ = +3.3V 5 15 30 µA Gate Discharge Current I3.3VGATE_, DIS V3.3VGATE _ = +12V, VON_ = 0 50 150 250 µA V+12VIN V Gate High Voltage V3.3VGATE_, HIGH I3.3VGATE _ = 1µA Gate Low Voltage V3.3VGATE_, LOW I3.3VGATE _ = 1µA, VON_ = 0 3.3VO_ Input Bias Current 3.3VO_ Internal Pulldown 3.3VSEN_ Input Bias Current I3.3VO_, BIAS RPD V+12VIN 0.5 0.1 V3.3VO_ = +3.3V VON_ = 0 V3.3VSEN_ = +3.3V Current-Limit Threshold V3.3V, LIM V3.3VGATE _ = +6V 41 Output Undervoltage Threshold V3.3VIN, UV V3.3VGATE _ falling 2.79 2 V 20 µA 1 I3.3VSEN_, BIAS Output Undervoltage Threshold Hysteresis 0.4 kΩ 10 µA 46 51 mV 2.89 2.99 V 30 _______________________________________________________________________________________ mV Dual PCI 2.2 Hot-Swap Controllers (V-12VIN = -12V, V+12VIN = +12V, V3.3VAUXIN = +3.3V, VON_ = VAUXON_ = +5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5 15 30 µA 50 150 250 µA V+12VIN V +5V SUPPLY CONTROL Gate Charge Current I5VGATE_, CHG V5VGATE_ = +6V, V5VSEN_ = +5V, V5VO_ = +5V Gate Discharge Current I5VGATE_, DIS V5VGATE_ = +12V, VON_ = 0 Gate High Voltage V5VGATE_, HIGH I5VGATE_ = 1µA Gate Low Voltage V5VGATE_, LOW I5VGATE_ = 1µA, VON_ = 0 5VO_ Input Bias Current I5VO_, BIAS V5VO_ = +5V 5VO_ Internal Pulldown R5VO_, PD VON_ = 0 5VSEN_ Input Bias Current I5VSEN_, BIAS V5VSEN_ = +5V Current-Limit Threshold V5VO_, LIM V5VGATE_ falling Output Undervoltage Threshold V5VO_, UV Output falling V+12VIN 0.5V 0.1 0.4 V 20 µA 1 kΩ 10 µA 27 31 35 mV 4.34 4.50 4.70 V Output Undervoltage Threshold Hysteresis 45 mV +12V SUPPLY CONTROL On-Resistance of Internal Switch Foldback Current Limit RDS(ON), +12V I+12VIN, LIM Current-Foldback Threshold TA = +25°C, ID = 0.5A 0.32 TA = +85°C, ID = 0.5A V+12VO_ = 0 0.5 0.68 Output current rising (Note 2) Output Undervoltage Threshold V+12VO_, UV Output falling +12VO_ Internal Pulldown R+12VO_, PD VON_ = 0 0.38 1 1.36 1.4 10.00 10.4 Ω A A 10.82 1 V kΩ -12V SUPPLY CONTROL On-Resistance of Internal Switch Foldback Current Limit RDS(ON), -12V TA = +25°C, ID = 0.1A I-12VIN, LIM V-12VO_ = 0 -12VO_ Internal Pullup R-12VO_, PU VON_ = 0 +3.3VAUX SUPPLY CONTROL Input Voltage Range V3.3VAUXIN Current-Foldback Threshold 3.3VAUXIN Undervoltage Lockout Hysteresis Supply Current 0.58 TA = +85°C, ID = 0.1A 136 Output current rising (Note 2) VUVLO, AUX Input rising 0.9 1.3 205 273 Ω mA 240 mA 1 kΩ 3.0 3.3 3.6 V 2.65 2.75 2.85 V 2 mA VUVLO-AUX, HYS 30 IQ, 3.3VAUX 1 mV _______________________________________________________________________________________ 3 MAX5915/MAX5916 ELECTRICAL CHARACTERISTICS (continued) MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers ELECTRICAL CHARACTERISTICS (continued) (V-12VIN = -12V, V+12VIN = +12V, V3.3VAUXIN = +3.3V, VON_ = VAUXON_ = +5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) PARAMETER SYMBOL On-Resistance of Internal Switch RDS(ON), 3.3VAUX Foldback Current Limit I3.3VAUXIN, LIM Current-Foldback Threshold CONDITIONS TA = +25°C, ID = 0.4A MIN TYP 0.24 TA = +85°C, ID = 0.4A V3.3VAUXO_ = 0 MAX 0.4 0.6 0.5 0.75 2.76 2.89 Output current rising (Note 2) 1.0 1.2 UNITS Ω A A Output Undervoltage Threshold V3.3VAUXIN, UV 2.99 Auxiliary Input UVLO Delay Time tDEG, UVLO (Note 1) 1.6 ms V 3.3VAUXO_ Internal Pulldown R3.3VAUXO_ ON_ = 0 1 kΩ ON AND AUXON COMPARATORS Threshold Voltage Hysteresis Input Bias Current ON_ and AUXON_ Deglitch Time 1.0 VHYS 2.1 25 IB, COMP tDEG mV 20 Figures 5–8 (Note 3) V µA µs 4 FAULT RESPONSE, PGOOD_ STATUS OUTPUT PGOOD_ Output Overcurrent and Undervoltage Response Time tRESP Figures 5–8 Output Overcurrent and Undervoltage Deglitch Time tDELAY Figures 3–7 16 ✕ tRESP ms PGOOD_ Startup Time Out tSTART See Figures 1, 2, 5, 6, 7, and 8 4✕ tDELAY ms Delay time to restart after OC and/or UV shutdown 64 ✕ tSTART ms Autorestart Delay PGOOD_ Output Low Voltage PGOOD_ Output High Leakage Current tRESTART VOL ILEAK Thermal Shutdown Threshold TSD Thermal Shutdown Hysteresis THYS Full Thermal Shutdown Threshold TSD, FULL Full Thermal Shutdown Hysteresis THYS, FULL Note 1: Note 2: Note 3: Note 4: Note 5: 4 ISINK = 2mA, ON_ = 0 0.5 1.5 0.5 0.7 V 1 µA VPGOOD_ = +5.5V (Note 4) (Note 5) ms 125 °C 5 °C TSD + 20 °C 5 °C tDEG, UVLO is negative edge triggered. There is no time delay when the inputs rise above the UVLO threshold. The current threshold when the output current starts to fold back. See the Typical Operating Characteristics. tDEG is negative edge triggered. ON_ or AUXON_ transition from low to high has no delay. Temperature threshold at which the outputs of the channel with overcurrent shut down. The temperature threshold at which both channels shut down. _______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers +12VO_ VOLTAGE vs. OUTPUT CURRENT +12VO_ CURRENT FOLDBACK vs. DIFFERENTIAL SWITCH VOLTAGE 11.6 11.5 11.4 0.1 1.5 1.0 4 2 -12VO_ CURRENT FOLDBACK vs. DIFFERENTIAL SWITCH VOLTAGE 5VO_ VOLTAGE vs. OUTPUT CURRENT 5VO_ VOLTAGE (V) MAX5915 toc05 4.98 4.96 4.94 4.92 4.90 4.88 4.86 4.84 0 4.82 4.80 4 2 6 8 10 4 3.3VO_ VOLTAGE vs. OUTPUT CURRENT 3.3VO_ SENSE RESISTOR VOLTAGE vs. DIFFERENTIAL SWITCH VOLTAGE 3.26 3.24 3.22 3.20 FAIRCHILD FDS6670A 0 2 6 4 OUTPUT CURRENT (A) 8 36 34 32 30 28 26 24 DURING CURRENT LIMIT FAIRCHILD FDS6670A 22 1.0 48 46 44 40 38 36 DURING CURRENT LIMIT FAIRCHILD FDS6670A 32 2.0 2.5 3.0 3.5 4.0 4.5 5.0 3.3VAUX_ VOLTAGE vs. OUTPUT CURRENT 42 34 1.5 VIN - V5VSEN_ (V) 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 30 3.16 250 40 3.3VAUX_ VOLTAGE (V) MAX5915 toc07 3.28 200 100 150 OUTPUT CURRENT (mA) 38 5 V-12VIN - V-12VO_ (V) 3.30 50 20 1 2 3 OUTPUT CURRENT (A) 3.32 3.18 FAIRCHILD FDS6670A 0 12 3.3VO_ CURRENT-LIMIT THRESHOLD (mV) 0 0 5VO_ SENSE RESISTOR VOLTAGE vs. DIFFERENTIAL SWITCH VOLTAGE 5.00 50 -11.9 12 10 5.02 MAX5915 toc04 100 -11.8 -12.1 0 OUTPUT CURRENT (A) 150 -11.7 -12.0 8 6 V+12VIN - V+12VO_ (V) 200 MAX5915 toc03 MAX5915 toc02 0.3 5VO_ CURRENT-LIMIT THRESHOLD (mV) 0.5 250 -12VO_ CURRENT FOLDBACK (mA) 0.5 -0.1 0 3.3VO_ VOLTAGE (V) 0.7 MAX5915 toc06 11.7 -11.6 MAX5915 toc09 11.8 0.9 -12VO_ VOLTAGE (V) 11.9 -11.5 MAX5915 toc08 +12VO_ VOLTAGE (V) 12.0 1.1 +12VO_ CURRENT FOLDBACK (A) MAX5915 toc01 12.1 -12VO_ VOLTAGE vs. OUTPUT CURRENT 2.5 1.0 1.5 2.0 2.5 VIN - V3.3VSEN_ (V) 3.0 3.5 0 0.15 0.30 0.45 0.60 0.75 0.90 1.05 1.20 OUTPUT CURRENT (A) _______________________________________________________________________________________ 5 MAX5915/MAX5916 Typical Operating Characteristics (V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005Ω, R3.3VSEN_ = 0.005Ω, C3.3VO_ = C5VO_ = 470µF, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47µF, TA = +25°C, unless otherwise noted. See Typical Application Circuit.) Typical Operating Characteristics (continued) (V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005Ω, R3.3VSEN_ = 0.005Ω, C3.3VO_ = C5VO_ = 470µF, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47µF, TA = +25°C, unless otherwise noted. See Typical Application Circuit.) 5VGATE_ AND 3.3VGATE_ CHARGE CURRENT vs. TEMPERATURE 650 600 550 23.5 21.5 19.5 17.5 15.5 13.5 3.3VGATE_ 11.5 175 CGATE = 1nF 9.5 500 3.0 -40 MAX5915 toc13 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 3.3V AUXILIARY INTERNAL SWITCH RON (Ω) +12V INTERNAL SWITCH RON vs. TEMPERATURE -15 10 35 60 -15 10 35 60 145 0.20 0.15 0.10 0.05 -40 35 60 85 0.7 0.6 0.5 0.4 0.3 0.2 0 -15 10 35 60 85 -40 TEMPERATURE (°C) TIME-TO-CHARGE GATE (CGATE = 1nF) 10 35 60 TIME-TO-CHARGE GATE (CGATE = 10nF) MAX5915 toc17 85 MAX5915 toc18 ON_, 5V/div 3.3VGATE_, 5V/div 3.3VGATE_, 5V/div 3.3VGATE_, 5V/div 5VGATE_, 5V/div 5VGATE_, 5V/div 5VGATE_, 5V/div 200µs/div -15 TEMPERATURE (°C) ON_, 5V/div 6 10 0.8 ON_, 5V/div 100µs/div -15 0.1 -40 MAX5915 toc16 CGATE = 1nF -12V INTERNAL SWITCH RON vs. TEMPERATURE 0.25 TIME-TO-CHARGE GATE (CGATE = 0.1nF) 5VGATE_ 140 3.3V AUXILIARY INTERNAL SWITCH RON vs. TEMPERATURE 0.30 TEMPERATURE (°C) 150 TEMPERATURE (°C) 0.35 85 155 85 0 -40 3.3VGATE_ 160 TEMPERATURE (°C) -12V INTERNAL SWITCH RON (Ω) 1.0 1.5 2.0 2.5 V3.3VAUXIN - V3.3VAUXO_ (V) 165 130 MAX5915 toc14 0.5 170 135 5VGATE_ 7.5 0 MAX5915 toc12 25.5 180 GATE DISCHARGE CURRENT (µA) 700 MAX5915 toc11 750 27.5 GATE CHARGE CURRENT (µA) MAX5915 toc10 3.3VAUX_ CURRENT FOLDBACK (mA) 800 5VGATE_ AND 3.3VGATE_ DISCHARGE CURRENT vs. TEMPERATURE MAX5915 toc15 3.3VAUX_ CURRENT FOLDBACK vs. DIFFERENTIAL SWITCH VOLTAGE +12V INTERNAL SWITCH RON (Ω) MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers 2ms/div _______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers 2.7 2.6 2.5 2.4 2.3 2.2 2.1 1.75 1.50 1.25 1.00 0.75 0.50 MAX5915 toc21 2.00 0 -15 10 35 60 85 2.05 2.00 1.95 RISING 1.90 FALLING 1.85 1.80 -40 -15 10 35 60 85 -40 10 35 60 TEMPERATURE (°C) +12V OUTPUT UNDERVOLTAGE THRESHOLD vs. TEMPERATURE 5V OUTPUT UNDERVOLTAGE THRESHOLD vs. TEMPERATURE 3.3V OUTPUT UNDERVOLTAGE THRESHOLD vs. TEMPERATURE 10.6 10.5 10.4 10.3 10.2 4.63 4.58 4.53 4.48 4.43 4.38 -15 10 35 60 85 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 -40 -15 10 35 60 85 -40 -15 10 35 60 TEMPERATURE (°C) TEMPERATURE (°C) 3.3V AUXILIARY OUTPUT UNDERVOLTAGE THRESHOLD vs. TEMPERATURE 3.3V AUXILIARY INPUT UVLO THRESHOLD vs. TEMPERATURE +12V INPUT UVLO THRESHOLD vs. TEMPERATURE 3.1 3.0 2.9 2.8 2.7 3.2 3.1 3.0 2.9 2.8 2.7 2.6 -15 10 35 TEMPERATURE (°C) 60 85 10.4 10.3 10.2 10.1 10.0 9.9 9.8 9.7 9.6 9.5 2.5 -40 10.5 85 MAX5915 toc27 3.3 +12V INPUT UVLO THRESHOLD (V) MAX5915 toc25 3.2 3.3V AUXILIARY INPUT UVLO THRESHOLD (V) TEMPERATURE (°C) 3.3 85 MAX5915 toc24 MAX5915 toc23 MAX5915 toc22 10.7 4.68 3.3V OUTPUT UNDERVOLTAGE THRESHOLD (V) TEMPERATURE (°C) 10.8 -40 -15 TEMPERATURE (°C) 5V OUTPUT UNDERVOLTAGE THRESHOLD (V) -40 +12V OUTPUT UNDERVOLTAGE THRESHOLD (V) 2.25 2.10 0.25 2.0 3.3V AUXILIARY OUTPUT UNDERVOLTAGE THRESHOLD (V) MAX5915 toc20 2.8 ON_ AND AUXON_ THRESHOLD vs. TEMPERATURE MAX5915 toc26 +12VIN SUPPLY CURRENT (mA) 2.9 2.50 3.3VAUXIN SUPPLY CURRENT (mA) MAX5915 toc19 3.0 3.3VAUXIN SUPPLY CURRENT vs. TEMPERATURE ON_ AND AUXON_ THRESHOLD (V) +12VIN SUPPLY CURRENT vs. TEMPERATURE -40 -15 10 35 TEMPERATURE (°C) 60 85 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 7 MAX5915/MAX5916 Typical Operating Characteristics (continued) (V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005Ω, R3.3VSEN_ = 0.005Ω, C3.3VO_ = C5VO_ = 470µF, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47µF, TA = +25°C, unless otherwise noted. See Typical Application Circuit.) Typical Operating Characteristics (continued) (V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005Ω, R3.3VSEN_ = 0.005Ω, C3.3VO_ = C5VO_ = 470µF, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47µF, TA = +25°C, unless otherwise noted. See Typical Application Circuit.) +12V OUTPUT CURRENT FOLDBACK vs. TEMPERATURE 0.9 0.8 0.7 230 210 190 170 150 -15 10 35 60 85 45 43 41 39 DURING CURRENT LIMIT 35 -40 -15 10 35 60 -40 85 -15 10 35 60 TEMPERATURE (°C) TEMPERATURE (°C) 3.3V AUXILIARY CURRENT FOLDBACK vs. TEMPERATURE 5VO_ SENSE RESISTOR VOLTAGE vs. TEMPERATURE MAIN SUPPLY TURN-ON WAVEFORMS 775 700 625 550 475 MAX5915 toc32 850 38 36 ON_ 5V/div 34 32 30 5VO_ 5V/div 28 26 12VO_ 10V/div 24 DURING CURRENT LIMIT 22 PGOOD_ 5V/div 20 -15 10 35 60 85 -40 TEMPERATURE (°C) -15 10 35 60 10ms/div 85 AUXON_ 5V/div MAIN SUPPLY TURN-OFF WAVEFORMS TURN-ON DELAY MAX5915 toc34 ON_ 5V/div 5VO_ 5V/div +12VO_ 10V/div 3.3VAUXO_ 2V/div MAX5915 toc36 MAX5915 toc35 +12VIN 10V/div +12VO_ 10V/div 3.3VAUXIN_ 2V/div ON_ = 5V AUXON_ = 5V ON_ = 5.0V 10ms/div AUXON_ = 5V TEMPERATURE (°C) AUXILIARY SUPPLY TURN-ON WAVEFORMS PGOOD_ 5V/div 85 MAX5915 toc33 40 5V0_ SENSE RESISTOR VOLTAGE (mV) 925 -40 47 TEMPERATURE (°C) MAX5915 toc31 -40 49 37 130 MAX5915 toc30 MAX5915 toc29 250 3.3V SENSE RESISTOR VOLTAGE (mV) 1.0 -12V OUTPUT CURRENT FOLDBACK (mA) MAX5915 toc28 +12V OUTPUT CURRENT FOLDBACK (A) 1.1 0.6 8 3.3VO_ SENSE RESISTOR VOLTAGE vs. TEMPERATURE -12V OUTPUT CURRENT FOLDBACK vs. TEMPERATURE 1.2 3.3V AXILIARY CURRENT FOLDBACK (mA) MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers 3.3VAUXO_ 2V/div 200µs/div PGOOD_ 5V/div 40ms/div _______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers AUXILIARY SUPPLY TURN-OFF WAVEFORMS tDEG DELAY TIME MAX5915 toc37 ON_ 5V/div MAIN SUPPLY LATCHED FAULT MANAGEMENT MAX5915 toc39 MAX5915 toc38 ON_ 5V/div +12VO_ 5V/div 3.3VAUXO_ 2V/div 5VO_ 2V/div 3.3VAUXO_ 2V/div 3.3VAUXO_ 5V/div PGOOD_ 5V/div PGOOD_ 5V/div PGOOD_ 5V/div 20ms/div 2µs/div 2ms/div MAIN SUPPLY AUTORESTART FAULT MANAGEMENT AUXILIARY SUPPLY FAULT MANAGEMENT +12VO_ IMMEDIATE SHORT-CIRCUIT RESPONSE MAX5915 toc40 +12VO_ 5V/div 5VO_ 2V/div MAX5915 toc41 +12VO_ 5V/div +12VO_ 5V/div 5VO_ I+12VO_ 10A/div 3.3VAUXO_ 5V/div 3.3VAUXO_ 5V/div PGOOD_ 5V/div PGOOD_ 5V/div PGOOD_ 5V/div 400ms/div 400ms/div 1µs/div -12VO_ IMMEDIATE SHORT-CIRCUIT RESPONSE +12VO_ CURRENT FOLDBACK MAX5915 toc43 +12VO_ 5V/div MAX5915 toc42 -12VO_ CURRENT FOLDBACK MAX5915 toc45 MAX5915 toc44 -12VO_ 5V/div -12VO_ 5V/div I-12VO_ 2A/div I-12VO_ 500mA/div I+12VO_ 5A/div PGOOD_ 5V/div 2ms/div PGOOD_ 5V/div 200ns/div PGOOD_ 5V/div 2ms/div _______________________________________________________________________________________ 9 MAX5915/MAX5916 Typical Operating Characteristics (continued) (V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005Ω, R3.3VSEN_ = 0.005Ω, C3.3VO_ = C5VO_ = 470µF, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47µF, TA = +25°C, unless otherwise noted. See Typical Application Circuit.) MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers Typical Operating Characteristics (continued) (V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005Ω, R3.3VSEN_ = 0.005Ω, C3.3VO_ = C5VO_ = 470µF, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47µF, TA = +25°C, unless otherwise noted. See Typical Application Circuit.) 5VO_ IMMEDIATE SHORT-CIRCUIT RESPONSE MAX5915 toc47 MAX5915 toc46 5VO_ 5V/div I5VO_ 10A/div PGOOD_ 5V/div FAIRCHILD FDS6670A MAX5915 toc48 5VO_ 5V/div 3.3VO_ 2V/div I5VO_ 10A/div I3.3VO_ 10A/div PGOOD_ 5V/div 40µs/div 3.3VO_ IMMEDIATE SHORT-CIRCUIT RESPONSE 5VO_ CURRENT LIMIT PGOOD_ 5V/div 2ms/div 3.3VAUXO_ IMMEDIATE SHORT-CIRCUIT RESPONSE 3.3VO_ CURRENT LIMIT 3.3VAUXO_ CURRENT FOLDBACK MAX5915 toc51 3.3VO_ 2V/div 3.3VAUXO_ 2V/div 3.3VAUXO_ 2V/div I3.3VO_ 10A/div I3.3VAUXO_ 10A/div I3.3VAUXO_ 1A/div 10 2ms/div 20µs/div MAX5915 toc50 MAX5915 toc49 PGOOD_ 5V/div FAIRCHILD FDS6670A PGOOD_ 5V/div 2µs/div PGOOD_ 5V/div 2ms/div ______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers PIN NAME FUNCTION 1 +12VOA 2 3.3VGATEA 3 3.3VSENA 4 3.3VOA 5 ONA Channel A Master ON/OFF Output Control. Drive ONA logic high to enable channel A +3.3V, +5V, and ±12V outputs. V+12VIN must be > UVLO threshold. 6 ONB Channel B Master ON/OFF Output Control. Drive ONB logic high to enable channel B +3.3V, +5V, and ±12V outputs. V+12VIN must be > UVLO threshold. 7 GND Ground 8 PGOODA Channel A Power-Good Output. PGOODA is an open-drain output that pulls low when a fault is detected on channel A outputs. 9 PGOODB Channel B Power-Good Output. PGOODB is an open-drain output that pulls low when a fault is detected on channel B outputs. 10 AUXONA Channel A 3.3VAUX ON/OFF Control Input. Drive AUXONA logic high to enable channel A +3.3V auxiliary output. 11 AUXONB Channel B 3.3VAUX ON/OFF Control Input. Drive AUXONB logic high to enable channel B +3.3V auxiliary output. Channel A +12V Output Channel A +3.3V External N-Channel MOSFET Gate Drive. 3.3VGATEA driven by +12VIN. Channel A External 3.3V Current-Sense Input Channel A +3.3V Output Sense 12 3.3VAUXOA Channel A 3.3VAUX Output 13 3.3VAUXIN 14 3.3VAUXOB Channel B 3.3VAUX Output 3.3VAUX Input. Provides power to the +3.3V auxiliary channels. 15 -12VOB Channel B -12V Output 16 -12VIN -12V Input 17 -12VOA Channel A -12V Output 18 5VOB 19 5VSENB 20 5VGATEB 21 5VOA 22 5VSENA 23 5VGATEA 24 3.3VOB 25 3.3VSENB 26 3.3VGATEB 27 +12VOB Channel B +12V Output 28 +12VIN +12V Input. +12VIN powers the main supplies of the MAX5915/MAX5916. Channel B +5V Output Sense Channel B External +5V Current-Sense Input Channel B +5V External N-Channel MOSFET Gate Drive. 5VGATEB driven by +12VIN. Channel A +5V Output Sense Channel A External +5V Current-Sense Input Channel A +5V External N-Channel MOSFET Gate Drive. 5VGATEA driven by +12VIN. Channel B +3.3V Output Sense Channel B External +3.3V Current-Sense Input Channel B +3.3V External N-Channel MOSFET Gate Drive. 3.3VGATEB driven by +12VIN. ______________________________________________________________________________________ 11 MAX5915/MAX5916 Pin Description MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers Table 1. PCI Standard Maximum Values SUPPLY VOLTAGE (V)* VOLTAGE TOLERANCE (%) MAX CURRENT (A) MAX POWER (W) +5 ±5 5 25 +3.3 ±0.3V 7.6 25 +12 ±5 0.5 6 -12 ±10 0.1 1.2 +3.3 aux (enabled) ±10 0.375 1.24 +3.3 aux (disabled) ±10 0.02 0.066 *Supply voltage is referenced to the output of the MAX5915/MAX5916. Detailed Description The MAX5915/MAX5916 are circuit-breaker ICs for hotswap applications where a PCI card is inserted into a slot that is connected to a live backplane. Normally, when a card is plugged into a live backplane, the card’s discharged capacitors provide a low-impedance path that can momentarily cause the main power supply to collapse. Both devices provide startup current limiting and undervoltage/overcurrent monitoring of two separate PCI card slots. Current limiting and short-circuit protection are achieved using external N-channel MOSFETs on the +3.3V and +5V supply lines and internal MOSFETs on the ±12V and +3.3V auxiliary supply lines. External sense resistors monitor the output currents of the +3.3V and +5V supplies. These external sense resistors adjust the overcurrent trip threshold. PCI standards dictate maximum values for the supply power and total power drawn from the backplane. The maximum power that any one PCI board can draw is 25W. Table 1 lists PCI standard maximum voltage, current, and power for each supply. Table 1 illustrates that both the +5V and +3.3V supplies can draw up to 25W. Total combination of output power should be limited to 25W based on PCI standard. Startup Mode The +12V input powers the internal circuitry of the MAX5915/MAX5916. The main supply outputs (3.3VO_, 5VO_, +12VO_, and -12VO_) can become active only after both of the following events have occurred: • V+12VIN is above its undervoltage lockout (UVLO) threshold. • ON_ is driven high. Figure 1 displays typical startup waveforms. The main supplies can be enabled without using the auxiliary supply; however, PGOOD_ remains in a low state if the 12 auxiliary supply is not used. The auxiliary supply (3.3VAUXO_) is available after both of these events have occurred: • V3.3VAUXIN is above its UVLO threshold. • AUXON_ is driven high. Normal Operation +3.3V, +5V, ±12V Outputs The internal circuitry for the MAX5915/MAX5916 monitors the output voltage on all channels except the -12V supply. All outputs are monitored for overcurrent. An undervoltage condition occurs when any supply’s output voltage falls below the set undervoltage level. An overcurrent fault occurs when a monitored output current reaches the set overcurrent threshold. Each supply has its own overcurrent and undervoltage thresholds. If any of the monitored voltages fall below their respective undervoltage level, or if any of the monitored output currents reach their overcurrent threshold, for a time period, tDELAY, the controller disables the channel with the fault condition (see the Fault Management section). External sense resistors monitor current through the external MOSFETs of the +3.3V and +5V outputs, while the current for the ±12V supplies are internally monitored. A fault condition on one of the main outputs causes all the channel’s main outputs to shut down after t DELAY and then either latch off (MAX5915) or automatically restart after tRESTART (MAX5916). A fault on any of the channel’s main outputs does not affect the channel’s auxiliary outputs. Normal Operation +3.3V Auxiliary Output Auxiliary output voltage and current are monitored internally. The +3.3V auxiliary output is independent of the main outputs but the main outputs are dependent on the auxiliary outputs. Fault conditions on the main outputs do not affect the auxiliary. A fault on the auxiliary supply causes the controller to dis- ______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5916 +12V UVLO THRESHOLD +12VIN 3.3VAUX UVLO THRESHOLD 3.3VAUXIN ON_ AUXON_ +12VO_ -12VO_ 5VO_ 3.3VO_ 3.3VAUXO_ PGOOD_ tSTART TIMING NOT TO SCALE Figure 1. Startup Waveforms able all of the affected channel outputs, auxiliary and main. A fault condition occurs when the output voltage falls below the set undervoltage threshold or the output current reaches the overcurrent threshold. When a fault occurs, all supplies of the affected channel are disabled after a time period tDELAY. All outputs are automatically restarted after a time equal to tRESTART. This reset is built into both the MAX5915/MAX5916. Current Limits All supplies are protected against output overcurrent or short-circuit conditions. The MAX5915 and MAX5916 employ a “brickwall” current limit on the +3.3V and +5V supplies and a current-foldback scheme on the ±12V and +3.3V auxiliary supplies. Brickwall A brickwall current limit protects the +3.3V and +5V main supplies by limiting the load current. The external sense resistors and the current-limit threshold set the brickwall current limits. A fault occurs when the load current reaches the brickwall limit. The main outputs shut down after tDELAY if the fault remains. The brickwall feature limits inrush current caused by positive supply voltage steps. Foldback The ±12V and +3.3V auxiliary supplies employ an internal current-foldback scheme. The MAX5915/MAX5916 gradually limit the load current once the current-foldback threshold is reached. If the overcurrent condition lasts longer than a fast transient, the output current is reduced to the foldback current limit and remains at that level for tDELAY unless the overcurrent condition is cleared. See the Typical Operating Characteristics. ______________________________________________________________________________________ 13 MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers +12VIN +12V UVLO THRESHOLD 3.3VAUX UVLO THRESHOLD 3.3VAUXIN ON_ AUXON_ +12VO_ 5VO_ 3.3VO_ -12VO_ 3.3VAUXO_ PGOOD_ tDEG.UVLO TIMING NOT TO SCALE tSTART tDEG.UVLO tSTART Figure 2. Input UVLO Fault Management in the MAX5915/MAX5916 Input Undervoltage Lockout UVLO prevents the MAX5915/MAX5916 from turning on internal/external MOSFETs until the input voltage exceeds the lockout threshold. The UVLO protects the MOSFETs from insufficient gate-drive voltage. Figure 2 shows that if an input undervoltage condition exists for more than tDEG,UVLO, the outputs are disabled and PGOOD_ goes low immediately. The time delay t DEG,UVLO is negative edge delayed and acts as a deglitch. Fault Management When a fault is detected on one of the main outputs, the MAX5915/MAX5916 disable the channel outputs after tDELAY. A fault occurs when any of the output voltages fall below their output undervoltage threshold or any of the output currents exceed their output overcurrent threshold. PGOOD_ pulls low if a fault persists for more than tRESP. The channel with the fault is disabled after tDELAY. If the fault is removed before tDELAY, the channel remains on and PGOOD_ pulls high immediately. 14 Latched Fault Protection The MAX5915 latches off the appropriate channel’s main outputs. Toggling +12VIN or ON_ restarts the main outputs. Figure 3 outlines the logic for the main and auxiliary shutdown control of the MAX5915, while fault handling is shown in Figures 5 and 6. Autoretry Fault Protection The MAX5916 automatically restarts the outputs after tRESTART. Both the MAX5915 and the MAX5916 handle faults on the auxiliary outputs by automatically restarting the appropriate channel. Figure 4 outlines the logic for the main and auxiliary shutdown control of the MAX5916, while fault handling is shown in Figures 6 and 7. Output Overcurrent External sense resistors monitor the current on the +5V and +3.3V outputs, while the +3.3V auxiliary and ±12V output currents are monitored internally. Figures 5, 6, and 7 show overcurrent fault management for the MAX5915/MAX5916. ______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5916 ENABLE_+12VIN MAIN ON HIGH = MAIN SUPPLIES ARE TURNED OFF STARTUP_+12VIN AUX OFF ENABLE_3.3VAUXIN HIGH = AUX SUPPLY TURNED OFF V D STARTUP_3.3VAUXIN tRESTART Q RESET Q OC_3.3VAUXO_ tDELAY tRESTART POSITIVE EDGE TRIGGERED D FLIP-FLOP, RESET IS ACTIVE LOW RESET UV_3.3VAUXO_ V = INTERNAL SUPPLY LOGIC GENERATED BY THE 12VIN OR THE 3.3VAUXIN, WHICHEVER IS HIGHER OC_3.3VO_ OC_5VO_ V tDELAY OC_+12VO_ OC_-12VO_ UV_3.3VO_ D Q RESET Q tDELAY POSITIVE EDGE TRIGGERED D FLIP-FLOP, RESET IS ACTIVE LOW UV_5VO_ UV_+12VO_ SEE TABLE 2 FOR EXPLANATION OF SIGNALS. Figure 3. Main and Auxiliary Supply Shutdown Control Logic for MAX5915 Output Undervoltage PGOOD_ Operation The output voltages on all supplies, except the -12V supply, are monitored for undervoltage. Output undervoltage fault management is identical to the output overcurrent fault management. Figures 5, 6, and 7 can be used to illustrate undervoltage faults on both the MAX5915/MAX5916. Both the MAX5915/MAX5916 incorporate a PGOOD_ output to report when power is good to a microprocessor or controller. PGOOD_ remains low if the auxiliary outputs are not powered, for PCI and compact PCI systems where the 3.3VAUX is not available. Connect 3.3VAUXIN to 3.3VIN and connect AUXON_ to ON_ to allow PGOOD_ to transition high when the main supplies are available. The open-drain structure of PGOOD_ requires an external pullup resistor (see the Functional Diagram). Figure 8 shows the internal logic of the PGOOD_ output. Thermal Shutdown Control The MAX5915/MAX5916 feature internal thermal protection. Two thresholds detect when the device is overheated. If the first threshold is reached, the channel that is in overcurrent shuts down. If the second thermal threshold is reached, the entire device shuts down. The device cannot be restarted until the thermal condition is cleared. For the MAX5915, the main channels turn back on after +12VIN or ON_ is toggled. For the MAX5916, the main channels turn back on after tRESTART. The auxiliary channels for both the MAX5915/MAX5916 restart after tRESTART. ______________________________________________________________________________________ 15 MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers ENABLE_+12VIN MAIN OFF HIGH = MAIN SUPPLIES ARE TURNED OFF STARTUP_+12VIN AUX OFF ENABLE_3.3VAUXIN HIGH = AUX SUPPLY TURNED ON V D STARTUP_3.3VAUXIN Q tRESTART RESET Q OC_3.3VAUXO_ tDELAY POSITIVE EDGE TRIGGERED D FLIP-FLOP, RESET IS ACTIVE LOW RESET UV_3.3VAUXO_ V = INTERNAL SUPPLY LOGIC GENERATED BY THE 12VIN OR THE 3.3VAUXIN, WHICHEVER IS HIGHER V OC_3.3VO_ OC_5VO_ D tDELAY OC_+12VO_ OC_-12VO_ UV_3.3VO_ Q tRESTART RESET Q tDELAY RESET POSITIVE EDGE TRIGGERED D FLIP-FLOP, RESET IS ACTIVE LOW UV_5VO_ UV_+12VO_ SEE TABLE 2 FOR EXPLANATION OF SIGNALS. tRESTART Figure 4. Main and Auxiliary Supply Shutdown Control Logic for MAX5916 Applications Information Component Selection External MOSFETs Select the external N-channel MOSFETs according to the application’s current requirement. Limit switch power dissipation by choosing a MOSFET with an RDS(ON) low enough to have a minimum voltage drop at full load. High RDS(ON) causes output ripple if the board has pulsing loads. High RDS(ON) can trigger an external undervoltage fault at full load. Determine the MOSFET’s power rating requirement to accommodate a short-circuit condition on the board during startup (see the External MOSFET Thermal Considerations section). Table 3 lists MOSFET and sense resistor manufacturers. 16 Sense Resistors The overcurrent sense voltage threshold on the +3.3V output is 46mV and 31mV on the +5V output. Choose a sense resistor using the following equation: RSENSE = (V-ILIM / ILOAD where ILOAD is the brickwall current limit for the output. Choose the sense resistors’ power rating to accommodate the overload current: PSENSE = (ILOAD)2 x RSENSE Additional External Gate Capacitance Connecting an external capacitance from the gates of the external MOSFETs to GND slows the turn on of the +5V and +3.3V supplies. ______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5916 Table 2. Logic Diagram Signal Descriptions SIGNAL NAME DESCRIPTION Enable_+12VIN Signal is HIGH: 1. +12VIN > VUVLO, +12V 2. ON_ = HIGH 3. Thermal shutdown NOT active Startup_+12VIN Signal is HIGH: 1. +12VIN > VUVLO, +12V 2. ON_ = HIGH 3. tSTART has elapsed Enable_3.3VAUXIN Signal is HIGH 1. 3.3VAUXIN > VUVLO, AUX 2. AUXON_ = HIGH 3. Thermal shutdown NOT active Startup_3.3VAUXIN Signal is HIGH: 1. 3.3VAUXIN > VUVLO, AUX 2. AUXON_ = HIGH 3. tSTART has elapsed OC_ Signal is HIGH when an overcurrent condition exists on the output of the supply. UV_ Signal is HIGH when an undervoltage condition exists on the output of the supply. Maximum Load Capacitance Layout Considerations Large capacitive loads can cause a problem when inserting discharged PCI cards into the live backplane. If the time needed to charge the capacitance of the board is greater than the typical startup time, 50ms, a fault can occur after startup. To take full advantage of the switch response time to an output fault condition, keep all traces as short as possible and maximize the high-current trace dimensions to reduce the effect of undesirable parasitic inductance. Place the MAX5915/MAX5916 close to the PCI card’s connector. Use a ground plane to minimize impedance and inductance. Minimize the current-sense resistor trace length and ensure accurate current sensing with Kelvin connections (Figure 9). When an output is short circuited, the voltage drop across the external MOSFET becomes large. Hence the power dissipation across the switch and die temperature both increase. An efficient way to achieve good power dissipation on a surface-mount package is to lay out two copper pads directly under the package on both sides of the board. Connect the two pads to the ground plane through vias, and use enlarged copper mounting pads on the topside of the board. The MAX5915/MAX5916 are able to withstand large capacitive loads due to their long startup time. Each supply has its own current-limit threshold. Calculate the maximum load capacitance as follows: CBOARD < 50ms x I_, LIM / VSUPPLY Input Transients The +12V and +3.3VAUX supplies must be above their respective UVLO thresholds before startup can occur. Input transients can cause the input voltage to sag below the UVLO threshold. The MAX5915/MAX5916 reject input transients that are shorter than tDEG, UVLO. External MOSFET Thermal Considerations The power dissipation of the external MOSFET is low when it is on, PD = ILOAD2 x RDS(ON). A considerable amount of power is dissipated during startup and continuous short-circuit conditions. The design must take into consideration the worst-case scenario. Chip Information TRANSISTOR COUNT: 1021 PROCESS: BiCMOS ______________________________________________________________________________________ 17 MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers +12VIN +12V UVLO THRESHOLD OVERCURRENT THRESHOLD IOUT (+12VO_, 5VO_, 3.3VO-, OR -12VO_) ON_ +12VO_ 5VO_ 3.3VO_ tDEG -12VO_ 3.3VAUXO_ PGOOD_ tRESP tDELAY tSTART OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE. Figure 5. Main Outputs Overcurrent Fault Management in the MAX5915 18 ______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5916 +12VIN +12V UVLO THRESHOLD OVERCURRENT UVLO THRESHOLD IOUT (3.3VAUXO_) ON_ +12VO_ 5VO_ 3.3VO_ tDEG -12VO_ 3.3VAUXO_ PGOOD_ tRESP tDELAY tRESTART tSTART OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE. Figure 6. Auxiliary Outputs Overcurrent Fault Management in the MAX5915/MAX5916 ______________________________________________________________________________________ 19 MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers +12VIN +12V UVLO THRESHOLD OVERCURRENT THRESHOLD IOUT (+12VO_, 5VO_, 3.3VO_, OR- 12VO_) ON_ +12VO_ 5VO_ 3.3VO_ -12VO_ 3.3VAUXO_ PGOOD_ tRESP tDELAY tRESTART tSTART OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE. Figure 7. Main Outputs Overcurrent Fault Handling in the MAX5916 20 ______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5916 tDEG tDEG, UVLO tDEG ON_ tSTART UVLO_+12VIN tDEG, UVLO tSTART UVLO_3.3VAUXIN PGOOD_ tDEG AUXON_ tDEG, UVLO GND OC_MAIN_OUTPUTS UV_MAIN_OUTPUTS tRESP tRESP OC_3.3VAUXO_ UV_3.3VAUXO_ Figure 8. PGOOD_ Logic Diagram ______________________________________________________________________________________ 21 MAX5915/MAX5916 Dual PCI 2.2 Hot-Swap Controllers Table 3. Component Manufacturers COMPONENT MANUFACTURER PHONE WEBSITE Dale-Vishay 402-564-3131 www.vishay.com IRC 704-264-8861 www.irctt.com Fairchild 888-522-5372 www.fairchildsemi.com International Rectifier 310-322-3331 www.irf.com Motorola 602-244-3576 www.mot-sps.com/ppd/ Sense Resistors MOSFETs Pin Configuration HIGH-CURRENT PATH TOP VIEW SENSE RESISTOR +12VOA 1 28 +12VIN 3.3VGATEA 2 27 +12VOB 3.3VSENA 3 26 3.3VGATEB 3.3VOA 4 25 3.3VSENB ONA 5 ONB 6 MAX5915 MAX5916 Figure 9. Kelvin Connections for Sense Resistors 24 3.3VOB MAX5915 MAX5916 GND 7 23 5VGATEA 22 5VSENA PGOODA 8 21 5VOA PGOODB 9 20 5VGATEB AUXONA 10 19 5VSENB AUXONB 11 18 5VOB 3.3VAUXOA 12 17 -12VOA 3.3VAUXIN 13 16 -12VIN 3.3VAUXOB 14 15 -12VOB TSSOP 22 ______________________________________________________________________________________ Dual PCI 2.2 Hot-Swap Controllers PCI CARD A +12V 3.3VAUX -12V +12VIN 3.3VAUXIN -12VIN PCI SLOT A BACKPLANE PCI SLOT B PCI CARD B +12V +12VOA +12VOB +12V -12V -12VOA -12VOB -12V 3.3VAUX 3.3VAUXOA 3.3VAUXOB 5VOA 5VSENA MAX5915 MAX5916 5VGATEA 5VSENB 5VGATEB ON OFF 3.3VAUX 5VOB ON ONA OFF ONB +5V +5V +5V +5V +3.3V +3.3V GND GND +3.3V ON OFF PGOODA PGOODB AUXONA AUXONB 3.3VGATEA 3.3VGATEB 3.3VSENA 3.3VSENB 3.3VOA +3.3V ON OFF 3.3VOB GND ______________________________________________________________________________________ 23 MAX5915/MAX5916 Typical Operating Circuit Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5916 Functional Diagram +12VIN -12VIN 3.3V 3.3V -12VOA -12VOB +12VOA +12VOB 3.3VGATEB 3.3VGATEA 3.3VSENA CHANNEL B CONTROL CHANNEL A CONTROL 3.3VSENB RSENSE RSENSE 3.3VOA 3.3VOB 5V 5VGATEA 5VSENA RSENSE 5V BIAS, BANDGAP REFERENCE, AND UVLO 5VGATEB 5VSENB TEMPERATURE SENSOR 5VOA RSENSE MAX5915 MAX5916 VPULLUP 5VOB CHARGE PUMP AND GATE CONTROL ONA ONB PGOODA PGOODB AUXONA 3.3VAUXIN 3.3VAUXOA AUXONB 3.3VAUXOB GND 24 ______________________________________________________________________________________ VPULLUP Dual PCI 2.2 Hot-Swap Controllers TSSOP,NO PADS.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX5915/MAX5916 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)