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19-2420; Rev 1; 4/04
Dual PCI 2.2 Hot-Swap Controllers
General Description
The MAX5915/MAX5915A/MAX5916/MAX5916A 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, these devices provide protection against shortcircuit, overcurrent, and undervoltage conditions. The MAX5915/MAX5915A/MAX5916/MAX5916A provide independent power controls for +3.3V, +5V, 12V, and +3.3V auxiliary supplies of two PCI cards. These devices provide intelligent selective thermal shutdown control that shuts down the channel with an overcurrent fault. All devices include internal power MOSFETs for the +12V, -12V, and +3.3V auxiliary outputs. These devices use internal charge pumps to activate the gates of the internal FETs controlling the +3.3V auxiliary supply. Internal FETs and current-sense circuitry regulate the 12V and the +3.3V auxiliary supplies. Channels A and B operate independently, allowing a single device to monitor two PCI card slots. The MAX5915/MAX5915A offer latched fault protection and the MAX5916/MAX5916A offer autorestart fault protection. The devices are available in the low-profile 28-pin TSSOP package and are specified over the -40C to +85C extended temperature range. o PCI 2.2 Compliant o Independent Power Controls for +3.3V, +5V, 12V, and +3.3V Auxiliary Supplies of Two PCI Cards o Internal MOSFET Switches for 12V and +3.3V Auxiliary Outputs o Separate ON/OFF Control Input for Each Channel o Independent +3.3V Auxiliary Output ON/OFF Control o Overcurrent Foldback with Timeout and Shutdown Protection for 12V and +3.3V Auxiliary Rails with Status Report o Brick Wall with Timeout and Shutdown Protection for +5V and +3.3V Rails with Status Report o Output Undervoltage Monitoring for +3.3V, +5V, +12V, and +3.3V Auxiliary Rails with Status Report o +3.3V Auxiliary Autorestart o Intelligent Selective Thermal Shutdown Control Shuts Down Only the Channel with an Overcurrent Fault o 28-Pin TSSOP Package
Features
MAX5915/MAX5915A/MAX5916/MAX5916A
Applications
PCI 2.2 Server PCI Server RAID
PART MAX5915EUI MAX5915AEUI MAX5916EUI MAX5916AEUI
Ordering Information
TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 28 TSSOP 28 TSSOP 28 TSSOP 28 TSSOP
Selector Guide, Pin Configuration, Functional Diagram, and Typical Operating Circuit appear at end of data sheet.
Typical Application Circuit
FAIRCHILD +3.3V FDS6670A 0.005 +5V FAIRCHILD FDS6670A 0.005 +12V 4.7F 0.1F -12V 4.7F 0.1F ON ON_ OFF 10k ON AUXON_ OFF 10k GND PGOOD_ +3.3VAUX 4.7F 0.1F 3.3VGATE_ +12VIN -12VIN 3.3VAUXIN 3.3VSEN_ 3.3VO_ 5VGATE_ 5VSEN_ 5VO_ +12VO_ -12VO_ 3.3VAUXO_ 47F 5V 470F 470F
47F 47F
MAX5915 MAX5915A MAX5916 MAX5916A
________________________________________________________________ Maxim Integrated Products
1
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.
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
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 = +70C) 28-Pin TSSOP (derate 23.8mW/C above +70C) ...........1.9W Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = -40C to +85C, unless otherwise specified. Typical values are at TA = +25C.)
PARAMETER POWER SUPPLIES Main Supply Input Voltage Range Main Supply Undervoltage Lockout (UVLO) Main Supply UVLO Hysteresis Main Input UVLO Delay Time Supply Current +3.3V SUPPLY CONTROL Gate Charge Current Gate Discharge Current Gate High Voltage Gate Low Voltage 3.3VO_ Input Bias Current 3.3VO_ Internal Pulldown 3.3VSEN_ Input Bias Current Current-Limit Threshold Output Undervoltage Threshold Output Undervoltage Threshold Hysteresis I3.3VGATE_, CHG I3.3VGATE_, DIS V3.3VGATE_, HIGH V3.3VGATE_, LOW I3.3VO_, BIAS RPD I3.3VSEN_, BIAS V3.3V, LIM V3.3VIN, UV V3.3VGATE _ = +6V, V3.3VSEN_ = +3.3V, V3.3VO_ = +3.3V V3.3VGATE _ = +12V, VON_ = 0V I3.3VGATE _ = 1A I3.3VGATE _ = 1A, VON_ = 0V V3.3VO_ = +3.3V VON_ = 0V V3.3VSEN_ = +3.3V V3.3VGATE _ = +6V V3.3VGATE _ falling 41 2.79 46 2.89 30 1 10 51 2.99 5 50 V+12VIN 0.5 0.1 15 150 30 250 V+12VIN 0.4 20 A A V V A k A mV V mV V+12VIN V+12UVLO VUVLO, HYS tDEG, UVLO IQ Figures 1 and 2 (Note 1) V+12VIN rising 10.8 9.6 12 10 100 1.6 2.5 5.0 13.2 10.8 V V mV ms mA SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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Dual PCI 2.2 Hot-Swap Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V-12VIN = -12V, V+12VIN = +12V, V3.3VAUXIN = +3.3V, VON_ = VAUXON_ = +5V, TA = -40C to +85C, unless otherwise specified. Typical values are at TA = +25C.)
PARAMETER +5V SUPPLY CONTROL Gate Charge Current Gate Discharge Current Gate High Voltage Gate Low Voltage 5VO_ Input Bias Current 5VO_ Internal Pulldown 5VSEN_ Input Bias Current Current-Limit Threshold Output Undervoltage Threshold Output Undervoltage Threshold Hysteresis +12V SUPPLY CONTROL On-Resistance of Internal Switch Foldback Current Limit Current-Foldback Threshold Output Undervoltage Threshold +12VO_ Internal Pulldown -12V SUPPLY CONTROL On-Resistance of Internal Switch Foldback Current Limit Current-Foldback Threshold -12VO_ Internal Pullup +3.3VAUX SUPPLY CONTROL Input Voltage Range 3.3VAUXIN Undervoltage Lockout Hysteresis Supply Current V3.3VAUXIN VUVLO, AUX VUVLO-AUX, HYS IQ, 3.3VAUX Input rising 3.0 2.65 3.3 2.75 30 1 2 3.6 2.85 V V mV mA R-12VO_, PU RDS(ON), -12V I-12VIN, LIM TA = +25C, ID = 0.1A TA = +85C, ID = 0.1A V-12VO_ = 0V Output current rising (Note 2) VON_ = 0V 136 205 240 1 0.58 0.9 1.3 273 mA mA k V+12VO_, UV R+12VO_, PD RDS(ON), +12V I+12VIN, LIM TA = +25C, ID = 0.5A TA = +85C, ID = 0.5A V+12VO_ = 0V Output current rising (Note 2) Output falling VON_ = 0V 10.00 0.68 1 1.4 10.4 1 10.82 0.32 0.38 0.5 1.36 A A V k I5VGATE_, CHG I5VGATE_, DIS V5VGATE_, HIGH V5VGATE_, LOW I5VO_, BIAS R5VO_, PD I5VSEN_, BIAS V5VO_, LIM V5VO_, UV V5VGATE_ = +6V, V5VSEN_ = +5V, V5VO_ = +5V V5VGATE_ = +12V, VON_ = 0V I5VGATE_ = 1A I5VGATE_ = 1A, VON_ = 0V V5VO_ = +5V VON_ = 0V V5VSEN_ = +5V V5VGATE_ falling Output falling 27 4.34 31 4.50 45 1 10 35 4.70 5 50 V+12VIN 0.5V 0.1 15 150 30 250 V+12VIN 0.4 20 A A V V A k A mV V mV SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5915/MAX5915A/MAX5916/MAX5916A
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Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
ELECTRICAL CHARACTERISTICS (continued)
(V-12VIN = -12V, V+12VIN = +12V, V3.3VAUXIN = +3.3V, VON_ = VAUXON_ = +5V, TA = -40C to +85C, unless otherwise specified. Typical values are at TA = +25C.)
PARAMETER On-Resistance of Internal Switch Foldback Current Limit Current-Foldback Threshold Output Undervoltage Threshold Auxiliary Input UVLO Delay Time V3.3VAUXIN, UV tDEG, UVLO (Note 1) ON_ = 0V 1.0 VHYS IB, COMP tDEG Figures 5-8 (Note 3) 4 25 20 SYMBOL RDS(ON), 3.3VAUX I3.3VAUXIN, LIM CONDITIONS TA = +25C, ID = 0.4A TA = +85C, ID = 0.4A V3.3VAUXO_ = 0V Output current rising (Note 2) 2.76 0.5 0.75 1.2 2.89 1.6 1 2.1 2.99 MIN TYP 0.24 MAX 0.4 0.6 1.0 UNITS A A V ms k V mV A s
3.3VAUXO_ Internal Pulldown R3.3VAUXO_ ON AND AUXON COMPARATORS Threshold Voltage Hysteresis Input Bias Current ON_ and AUXON_ Deglitch Time
FAULT RESPONSE, PGOOD_ STATUS OUTPUT COMPARATORS PGOOD_ Output Overcurrent and Undervoltage Response Time Output Overcurrent and Undervoltage Deglitch Time PGOOD_ Startup Timeout Autorestart Delay PGOOD_ Output Low Voltage PGOOD_ Output High Leakage Current Thermal Shutdown Threshold Thermal Shutdown Hysteresis Full Thermal Shutdown Threshold Full Thermal Shutdown Hysteresis tRESP tRESP2 tDELAY tSTART tRESTART VOL ILEAK TSD THYS TSD, FULL THYS, FULL (Note 5) Figures 5-8 Figures 5-8 Figures 3-7 See Figures 1, 2, 5, 6, 7, and 8 Delay time to restart after OC and/or UV shutdown ISINK = 2mA, ON_ = 0V VPGOOD_ = +5.5V (Note 4) 125 5 TSD + 20 5 MAX5915/MAX5916 MAX5915A/MAX5916A 0.5 100 16 x tRESP 4x tDELAY 64 x tSTART 0.5 0.7 1 1.5 ms ns ms ms ms V A C C C C
Note 1: Note 2: Note 3: Note 4: Note 5:
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.
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Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Characteristics
(V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005, R3.3VSEN_ = 0.005, C3.3VO_ = C5VO_ = 470F, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47F, TA = +25C, unless otherwise noted. See Typical Application Circuit.)
+12VO_ VOLTAGE vs. OUTPUT CURRENT
MAX5915 toc01
MAX5915/MAX5915A/MAX5916/MAX5916A
+12VO_ CURRENT FOLDBACK vs. DIFFERENTIAL SWITCH VOLTAGE
MAX5915 toc02
-12VO_ VOLTAGE vs. OUTPUT CURRENT
MAX5915 toc03
12.1 12.0 +12VO_ VOLTAGE (V) 11.9 11.8 11.7 11.6 11.5 11.4 0 0.5 1.0
1.1 +12VO_ CURRENT FOLDBACK (A) 0.9 0.7 0.5 0.3 0.1 -0.1
-11.5 -11.6 -12VO_ VOLTAGE (V) -11.7 -11.8 -11.9 -12.0 -12.1
1.5
0
2
OUTPUT CURRENT (A)
8 6 V+12VIN - V+12VO_ (V)
4
10
12
0
50
200 100 150 OUTPUT CURRENT (mA)
250
-12VO_ CURRENT FOLDBACK vs. DIFFERENTIAL SWITCH VOLTAGE
MAX5915 toc04
5VO_ VOLTAGE vs. OUTPUT CURRENT
MAX5915 toc05
5VO_ SENSE RESISTOR VOLTAGE vs. DIFFERENTIAL SWITCH VOLTAGE
5VO_ CURRENT-LIMIT THRESHOLD (mV) 38 36 34 32 30 28 26 24 22 20 1.0 DURING CURRENT LIMIT FAIRCHILD FDS6670A 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
MAX5915 toc06
250 -12VO_ CURRENT FOLDBACK (mA)
5.02 5.00 4.98 5VO_ VOLTAGE (V) 4.96 4.94 4.92 4.90 4.88 4.86 4.84 4.82 4.80
40
200
150
100
50 0 0 2 4 6 8 10 12 V-12VIN - V-12VO_ (V)
FAIRCHILD FDS6670A 0 1 2 3 OUTPUT CURRENT (A) 4 5
VIN - V5VSEN_ (V)
3.3VO_ VOLTAGE vs. OUTPUT CURRENT
MAX5915 toc07
3.3VO_ SENSE RESISTOR VOLTAGE vs. DIFFERENTIAL SWITCH VOLTAGE
3.3VO_ CURRENT-LIMIT THRESHOLD (mV)
MAX5915 toc08
3.3VAUX_ VOLTAGE vs. OUTPUT CURRENT
3.4 3.3 3.3VAUX_ VOLTAGE (V) 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5
MAX5915 toc09
3.32 3.30 3.28 3.3VO_ VOLTAGE (V) 3.26 3.24 3.22 3.20 3.18 3.16 0 2 6 4 OUTPUT CURRENT (A) 8 FAIRCHILD FDS6670A
48 46 44 42 40 38 36 34 32 30 1.0 1.5 2.0 2.5 3.0 DURING CURRENT LIMIT FAIRCHILD FDS6670A
3.5
3.5
0
0.15 0.30 0.45 0.60 0.75 0.90 1.05 1.20 OUTPUT CURRENT (A)
VIN - V3.3VSEN_ (V)
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Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
Typical Operating Characteristics (continued)
(V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005, R3.3VSEN_ = 0.005, C3.3VO_ = C5VO_ = 470F, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47F, TA = +25C, unless otherwise noted. See Typical Application Circuit.)
3.3VAUX_ CURRENT FOLDBACK vs. DIFFERENTIAL SWITCH VOLTAGE
MAX5915 toc10
5VGATE_ AND 3.3VGATE_ CHARGE CURRENT vs. TEMPERATURE
MAX5915 toc11
5VGATE_ AND 3.3VGATE_ DISCHARGE CURRENT vs. TEMPERATURE
175 GATE DISCHARGE CURRENT (A) 170 165 160 155 150 145 140 135 130 5VGATE_ CGATE = 1nF -40 -15 10 35 60 85 3.3VGATE_
MAX5915 toc12
800 3.3VAUX_ CURRENT FOLDBACK (mA) 750 700 650 600 550 500 0 0.5 1.0 1.5 2.0 2.5 V3.3VAUXIN - V3.3VAUXO_ (V) 3.0
27.5 25.5 GATE CHARGE CURRENT (A) 23.5 21.5 19.5 17.5 15.5 13.5 11.5 9.5 7.5 CGATE = 1nF 5VGATE_ -40 -15 10 35 60 3.3VGATE_
180
3.5
85
TEMPERATURE (C)
TEMPERATURE (C)
+12V INTERNAL SWITCH RON vs. TEMPERATURE
MAX5915 toc13
3.3V AUXILIARY INTERNAL SWITCH RON vs. TEMPERATURE
MAX5915 toc14
-12V INTERNAL SWITCH RON vs. TEMPERATURE
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
MAX5915 toc15
+12V INTERNAL SWITCH RON ()
0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 -40 -15 10 35 60
3.3V AUXILIARY INTERNAL SWITCH RON ()
0.45
0.35 0.30 0.25 0.20 0.15 0.10 0.05 0
0.8 -12V INTERNAL SWITCH RON ()
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
TIME-TO-CHARGE GATE (CGATE = 0.1nF)
TIME-TO-CHARGE GATE (CGATE = 1nF)
MAX5915 toc16
MAX5915 toc17
TIME-TO-CHARGE GATE (CGATE = 10nF)
MAX5915 toc18
ON_ 5V/div
ON_ 5V/div
ON_ 5V/div
3.3VGATE_ 5V/div 5VGATE_ 5V/div 100s/div
3.3VGATE_ 5V/div 5VGATE_ 5V/div 200s/div
3.3VGATE_ 5V/div 5VGATE_ 5V/div 2ms/div
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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_ = 0.005, R3.3VSEN_ = 0.005, C3.3VO_ = C5VO_ = 470F, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47F, TA = +25C, unless otherwise noted. See Typical Application Circuit.)
+12VIN SUPPLY CURRENT vs. TEMPERATURE
MAX5915 toc19
MAX5915/MAX5915A/MAX5916/MAX5916A
3.3VAUXIN SUPPLY CURRENT vs. TEMPERATURE
MAX5915 toc20
ON_ AND AUXON_ THRESHOLD vs. TEMPERATURE
MAX5915 toc21
3.0 2.9 +12VIN SUPPLY CURRENT (mA) 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 -40 -15 10 35 60
2.50 3.3VAUXIN SUPPLY CURRENT (mA) 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0
2.10 ON_ AND AUXON_ THRESHOLD (V) 2.05 2.00 1.95 RISING 1.90 1.85 1.80 FALLING
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
+12V OUTPUT UNDERVOLTAGE THRESHOLD vs. TEMPERATURE
+12V OUTPUT UNDERVOLTAGE THRESHOLD (V)
MAX5915 toc22
5V OUTPUT UNDERVOLTAGE THRESHOLD vs. TEMPERATURE
MAX5915 toc23
3.3V OUTPUT UNDERVOLTAGE THRESHOLD vs. TEMPERATURE
3.3V OUTPUT UNDERVOLTAGE THRESHOLD (V) 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 -40 -15 10 35 60 85
MAX5915 toc24
10.7 10.6 10.5 10.4 10.3 10.2 -40 -15 10 35 60
5V OUTPUT UNDERVOLTAGE THRESHOLD (V)
10.8
4.68 4.63 4.58 4.53 4.48 4.43 4.38
3.3
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
3.3V AUXILIARY OUTPUT UNDERVOLTAGE THRESHOLD (V)
3.3V AUXILIARY OUTPUT UNDERVOLTAGE THRESHOLD vs. TEMPERATURE
MAX5915 toc25
3.3V AUXILIARY INPUT UVLO THRESHOLD vs. TEMPERATURE
3.3V AUXILIARY INPUT UVLO THRESHOLD (V)
MAX5915 toc26
+12V INPUT UVLO THRESHOLD vs. TEMPERATURE
10.4 +12V INPUT UVLO THRESHOLD (V) 10.3 10.2 10.1 10.0 9.9 9.8 9.7 9.6 9.5
MAX5915 toc27
3.3 3.2 3.1 3.0 2.9 2.8 2.7 -40 -15 10 35 60
3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 -40 -15 10 35 60
10.5
85
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
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Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
Typical Operating Characteristics (continued)
(V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005, R3.3VSEN_ = 0.005, C3.3VO_ = C5VO_ = 470F, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47F, TA = +25C, unless otherwise noted. See Typical Application Circuit.)
+12V OUTPUT CURRENT FOLDBACK vs. TEMPERATURE
MAX5915 toc28
-12V OUTPUT CURRENT FOLDBACK vs. TEMPERATURE
-12V OUTPUT CURRENT FOLDBACK (mA) 3.3V SENSE RESISTOR VOLTAGE (mV) 250 230 210 190 170 150 130
MAX5915 toc29
3.3VO_ SENSE RESISTOR VOLTAGE vs. TEMPERATURE
49 47 45 43 41 39 37 35 DURING CURRENT LIMIT -40 -15 10 35 60 85
MAX5915 toc30
1.2 +12V OUTPUT CURRENT FOLDBACK (A) 1.1 1.0 0.9 0.8 0.7 0.6 -40 -15 10 35 60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
3.3V AUXILIARY CURRENT FOLDBACK vs. TEMPERATURE
MAX5915 toc31
5VO_ SENSE RESISTOR VOLTAGE vs. TEMPERATURE
5V0_ SENSE RESISTOR VOLTAGE (mV) 38 36 34 32 30 28 26 24 22 20 -40 DURING CURRENT LIMIT -15 10 35 60 85 5VO_ 5V/div 12VO_ 10V/div PGOOD_ 5V/div
MAX5915 toc32
MAIN SUPPLY TURN-ON WAVEFORMS
MAX5915 toc33
40
3.3V AXILIARY CURRENT FOLDBACK (mA)
925 850 775 700 625 550 475 -40 -15 10 35 60
ON_ 5V/div
AUXON_ = 5V 10ms/div
85
TEMPERATURE (C)
TEMPERATURE (C)
AUXILIARY SUPPLY TURN-ON WAVEFORMS
MAX5915 toc34
TURN-ON DELAY
MAX5915 toc35
MAIN SUPPLY TURN-OFF WAVEFORMS
MAX5915 toc36
AUXON_ 5V/div
+12VIN 10V/div +12VO_ 10V/div 3.3VAUXIN_ 2V/div
ON_ 5V/div 5VO_ 5V/div +12VO_ 10V/div
3.3VAUXO_ 2V/div
PGOOD_ 5V/div
ON_ = 5.0V 10ms/div
3.3VAUXO_ 2V/div 200s/div
ON_ = 5V AUXON_ = 5V
PGOOD_ 5V/div
40ms/div
8
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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_ = 0.005, R3.3VSEN_ = 0.005, C3.3VO_ = C5VO_ = 470F, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47F, TA = +25C, unless otherwise noted. See Typical Application Circuit.)
AUXILIARY SUPPLY TURN-OFF WAVEFORMS
MAX5915 toc37
MAX5915/MAX5915A/MAX5916/MAX5916A
tDEG DELAY TIME
MAIN SUPPLY LATCHED FAULT MANAGEMENT
MAX5915 toc38 MAX5915 toc39
ON_ 5V/div
ON_ 5V/div 3.3VAUXO_ 2V/div
+12VO_ 5V/div
3.3VAUXO_ 2V/div
5VO_ 2V/div 3.3VAUXO_ 5V/div PGOOD_ 5V/div PGOOD_ 5V/div 2s/div 2ms/div
PGOOD_ 5V/div
20ms/div
MAIN SUPPLY AUTORESTART FAULT MANAGEMENT
MAX5915 toc40
AUXILIARY SUPPLY FAULT MANAGEMENT
MAX5915 toc41
+12VO_ IMMEDIATE SHORT-CIRCUIT RESPONSE
MAX5915 toc42
+12VO_ 5V/div
+12VO_ 5V/div
+12VO_ 5V/div
5VO_ 2V/div 3.3VAUXO_ 5V/div
5VO_ 3.3VAUXO_ 5V/div PGOOD_ 5V/div 400ms/div 400ms/div
I+12VO_ 10A/div PGOOD_ 5V/div
PGOOD_ 5V/div
1s/div
+12VO_ CURRENT FOLDBACK
MAX5915 toc43
-12VO_ IMMEDIATE SHORT-CIRCUIT RESPONSE
MAX5915 toc44
-12VO_ CURRENT FOLDBACK
MAX5915 toc45
+12VO_ 5V/div
-12VO_ 5V/div
-12VO_ 5V/div
I+12VO_ 5A/div
I-12VO_ 2A/div
I-12VO_ 500mA/div
PGOOD_ 5V/div 2ms/div
PGOOD_ 5V/div 200ns/div
PGOOD_ 5V/div 2ms/div
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9
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
Typical Operating Characteristics (continued)
(V+12VIN = +12V, V3.3VAUXIN = +3.3V, V-12VIN = -12V, V5V = +5V, V3.3V = +3.3V, R5VSEN_ = 0.005, R3.3VSEN_ = 0.005, C3.3VO_ = C5VO_ = 470F, C+12VO_ = C-12VO_ = C3.3VAUXO_ = 47F, TA = +25C, unless otherwise noted. See Typical Application Circuit.)
5VO_ IMMEDIATE SHORT-CIRCUIT RESPONSE
MAX5915 toc46
5VO_ CURRENT LIMIT
MAX5915 toc47
3.3VO_ IMMEDIATE SHORT-CIRCUIT RESPONSE
MAX5915 toc48
5VO_ 5V/div
5VO_ 5V/div
3.3VO_ 2V/div
I5VO_ 10A/div
I5VO_ 10A/div
I3.3VO_ 10A/div FAIRCHILD FDS6670A
PGOOD_ 5V/div
FAIRCHILD FDS6670A PGOOD_ 5V/div 40s/div 2ms/div
PGOOD_ 5V/div
20s/div
3.3VO_ CURRENT LIMIT
MAX5915 toc49
3.3VAUXO_ IMMEDIATE SHORT-CIRCUIT RESPONSE
MAX5915 toc50
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 PGOOD_ 5V/div 2s/div 2ms/div
PGOOD_ 5V/div 2ms/div
PGOOD_ 5V/div
MAX5915A/MAX5916A 12VO_ SHORT CIRCUIT
MAX5915 toc52
MAX5915A/MAX5916A 3.3VO_ SHORT CIRCUIT
MAX5915 toc53
MAX5915A/MAX5916A 3.3VAUXO_ SHORT CIRCUIT
MAX5915 toc54
12VO_ 5V/div
3.3VO_ 1V/div
3.3VAUXO_ 1V/div
PGOOD_ 5V/div
tRESP2
PGOOD_ 5V/div
tRESP2
PGOOD_ 5V/div
tRESP2
100ns/div
100ns/div
100ns/div
10
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Dual PCI 2.2 Hot-Swap Controllers
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 NAME +12VOA 3.3VGATEA 3.3VSENA 3.3VOA ONA ONB GND PGOODA PGOODB AUXONA AUXONB 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 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. 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. Ground Channel A Power-Good Output. PGOODA is an open-drain output that pulls low when a fault is detected on channel A outputs. Channel B Power-Good Output. PGOODB is an open-drain output that pulls low when a fault is detected on channel B outputs. Channel A 3.3VAUX ON/OFF Control Input. Drive AUXONA logic high to enable channel A +3.3V auxiliary output. Channel B 3.3VAUX ON/OFF Control Input. Drive AUXONB logic high to enable channel B +3.3V auxiliary output. FUNCTION
MAX5915/MAX5915A/MAX5916/MAX5916A
3.3VAUXOA Channel A 3.3VAUX Output 3.3VAUXIN 3.3VAUX Input. Provides power to the +3.3V auxiliary channels.
3.3VAUXOB Channel B 3.3VAUX Output -12VOB -12VIN -12VOA 5VOB 5VSENB 5VGATEB 5VOA 5VSENA 5VGATEA 3.3VOB 3.3VSENB 3.3VGATEB +12VOB +12VIN Channel B -12V Output -12V Input Channel A -12V Output 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. Channel B +12V Output +12V Input. +12VIN powers the main supplies of the MAX5915/MAX5915A/MAX5916/MAX5916A.
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11
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
Table 1. PCI Standard Maximum Values
SUPPLY VOLTAGE (V)* +5 +3.3 +12 -12 +3.3 aux (enabled) +3.3 aux (disabled) VOLTAGE TOLERANCE (%) 5 0.3V 5 10 10 10 MAX CURRENT (A) 5 7.6 0.5 0.1 0.375 0.02 MAX POWER (W) 25 25 6 1.2 1.24 0.066
*Supply voltage is referenced to the output of the MAX5915/MAX5916.
Detailed Description
The MAX5915/MAX5915A/MAX5916/MAX5916A are circuit-breaker ICs for hot-swap 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.
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 these devices 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 tDELAY and then either latch off (MAX5915/MAX5915A) or automatically restart after tRESTART (MAX5916/MAX5916A). A fault on any of the channel's main outputs does not affect the channel's auxiliary outputs.
Startup Mode
The +12V input powers the internal circuitry of these devices. 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
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 disable all of the affected
______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
+12V UVLO THRESHOLD
+12VIN 3.3VAUX UVLO THRESHOLD
3.3VAUXIN ON_ AUXON_
+12VO_ -12VO_
5VO_ 3.3VO_
3.3VAUXO_
PGOOD_ TIMING NOT TO SCALE tSTART
Figure 1. Startup Waveforms
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 all devices.
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/ MAX5915A/MAX5916/MAX5916A 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.
Current Limits
All supplies are protected against output overcurrent or short-circuit conditions. The MAX5915/MAX5915A and MAX5916/MAX5916A 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
______________________________________________________________________________________
13
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
+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/MAX5915A/MAX5916/MAX5916A
Input Undervoltage Lockout
UVLO prevents these devices 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 tDEG,UVLO is negative edge delayed and acts as a deglitch.
Latched Fault Protection The MAX5915/MAX5915A latch 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/MAX5916A automatically restart the outputs after t RESTART . The MAX5915/MAX5915A/ MAX5916/MAX5916A 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.
Fault Management
When a fault is detected on one of the main outputs, the MAX5915/MAX5915A/MAX5916/MAX5916A 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. The MAX5915/MAX5916 are available with a response time of 1.5ms (t RESP ). The MAX5915A/MAX5916A offer a response time of 100ns (tRESP2). If the fault is removed before tDELAY, the channel remains on and PGOOD_ pulls high immediately.
14
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/MAX5915A/MAX5916/MAX5916A.
______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
ENABLE_+12VIN MAIN ON HIGH = MAIN SUPPLIES ARE TURNED OFF STARTUP_+12VIN ENABLE_3.3VAUXIN AUX OFF HIGH = AUX SUPPLY TURNED OFF V STARTUP_3.3VAUXIN D RESET Q POSITIVE EDGE TRIGGERED D FLIP-FLOP, RESET IS ACTIVE LOW tRESTART Q tRESTART
OC_3.3VAUXO_ tDELAY UV_3.3VAUXO_ RESET
OC_3.3VO_ OC_5VO_ tDELAY OC_+12VO_ OC_-12VO_ UV_3.3VO_ UV_5VO_ UV_+12VO_ SEE TABLE 2 FOR EXPLANATION OF SIGNALS. tDELAY
V = INTERNAL SUPPLY LOGIC GENERATED BY THE 12VIN OR THE 3.3VAUXIN, WHICHEVER IS HIGHER V D RESET Q POSITIVE EDGE TRIGGERED D FLIP-FLOP, RESET IS ACTIVE LOW Q
Figure 3. Main and Auxiliary Supply Shutdown Control Logic for MAX5915/MAX5915A
Output Undervoltage
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 the MAX5915/MAX5915A/MAX5916/MAX5916A.
PGOOD_ Operation
The MAX5915/MAX5915A/MAX5916/MAX5916A 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/MAX5915A/MAX5916/MAX5916A 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 t RESTART . The auxiliary channels for the MAX5915/ MAX5915A/MAX5916/MAX5916A restart after tRESTART.
______________________________________________________________________________________
15
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
ENABLE_+12VIN MAIN OFF HIGH = MAIN SUPPLIES ARE TURNED OFF STARTUP_+12VIN ENABLE_3.3VAUXIN V STARTUP_3.3VAUXIN D RESET Q POSITIVE EDGE TRIGGERED D FLIP-FLOP, RESET IS ACTIVE LOW Q tRESTART AUX OFF HIGH = AUX SUPPLY TURNED ON
OC_3.3VAUXO_ tDELAY UV_3.3VAUXO_ RESET
OC_3.3VO_ OC_5VO_ tDELAY OC_+12VO_ OC_-12VO_ UV_3.3VO_ UV_5VO_ UV_+12VO_ tDELAY RESET
V D RESET Q Q
V = INTERNAL SUPPLY LOGIC GENERATED BY THE 12VIN OR THE 3.3VAUXIN, WHICHEVER IS HIGHER tRESTART
POSITIVE EDGE TRIGGERED D FLIP-FLOP, RESET IS ACTIVE LOW
SEE TABLE 2 FOR EXPLANATION OF SIGNALS. tRESTART
Figure 4. Main and Auxiliary Supply Shutdown Control Logic for MAX5916/MAX5916A
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.
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.
16
______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
Table 2. Logic Diagram Signal Descriptions
SIGNAL NAME Signal is HIGH: 1. +12VIN > VUVLO, +12V 2. ON_ = HIGH 3. Thermal shutdown NOT active Signal is HIGH: 1. +12VIN > VUVLO, +12V 2. ON_ = HIGH 3. tSTART has elapsed Signal is HIGH 1. 3.3VAUXIN > VUVLO, AUX 2. AUXON_ = HIGH 3. Thermal shutdown NOT active Signal is HIGH: 1. 3.3VAUXIN > VUVLO, AUX 2. AUXON_ = HIGH 3. tSTART has elapsed Signal is HIGH when an overcurrent condition exists on the output of the supply. Signal is HIGH when an undervoltage condition exists on the output of the supply. DESCRIPTION
Enable_+12VIN
Startup_+12VIN
Enable_3.3VAUXIN
Startup_3.3VAUXIN
OC_ UV_
Maximum Load Capacitance
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. The MAX5915/MAX5915A/MAX5916/MAX5916A 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
Layout Considerations
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/MAX5915A/MAX5916/MAX5916A 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.
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/MAX5915A/ MAX5916/MAX5916A 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
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
+12VIN
+12V UVLO THRESHOLD
OVERCURRENT THRESHOLD
IOUT (+12VO_, 5VO_, 3.3VO-, OR -12VO_) ON_
+12VO_ 5VO_ 3.3VO_ tDEG
-12VO_
3.3VAUXO_
PGOOD_ tRESP (tRESP2) tDELAY OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE. ( ) FOR MAX5915A. tSTART
Figure 5. Main Outputs Overcurrent Fault Management in the MAX5915/MAX5915A
18
______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
+12VIN
+12V UVLO THRESHOLD
OVERCURRENT UVLO THRESHOLD IOUT (3.3VAUXO_)
ON_ +12VO_ 5VO_ 3.3VO_ tDEG
-12VO_
3.3VAUXO_
PGOOD_ tRESP (tRESP2) tDELAY tRESTART tSTART
OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE. ( ) FOR MAX5915A/MAX5916A.
Figure 6. Auxiliary Outputs Overcurrent Fault Management in the MAX5915/MAX5915A/MAX5916/MAX5916A
______________________________________________________________________________________
19
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
+12VIN
+12V UVLO THRESHOLD
OVERCURRENT THRESHOLD
IOUT (+12VO_, 5VO_, 3.3VO_, OR- 12VO_)
ON_ +12VO_ 5VO_ 3.3VO_
-12VO_
3.3VAUXO_ PGOOD_ tRESP (tRESP2) tDELAY tRESTART tSTART
OUTPUT UNDERVOLTAGE FAULT HANDLING RESULTS IN SIMILAR RESPONSE. TIMING NOT TO SCALE. ( ) FOR MAX5916A.
Figure 7. Main Outputs Overcurrent Fault Handling in the MAX5916/MAX5916A
20
______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
tDEG ON_ UVLO_+12VIN AUXON_ UVLO_3.3VAUXIN tDEG
tDEG, UVLO
tSTART tDEG, UVLO tSTART tDEG tDEG, UVLO GND OC_MAIN_OUTPUTS UV_MAIN_OUTPUTS tRESP tRESP (tRESP2) OC_3.3VAUXO_ UV_3.3VAUXO_ ( ) FOR MAX5915A/MAX5916A. PGOOD_
Figure 8. PGOOD_ Logic Diagram
______________________________________________________________________________________
21
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
Table 3. Component Manufacturers
COMPONENT Sense Resistors IRC Fairchild MOSFETs International Rectifier Motorola 704-264-8861 888-522-5372 310-322-3331 602-244-3576 www.irctt.com www.fairchildsemi.com www.irf.com www.mot-sps.com/ppd/ MANUFACTURER Dale-Vishay PHONE 402-564-3131 WEBSITE www.vishay.com
Pin Configuration
HIGH-CURRENT PATH
TOP VIEW
+12VOA 1 SENSE RESISTOR 3.3VGATEA 2 3.3VSENA 3 3.3VOA 4 ONA 5 ONB 6 MAX5915 MAX5915A MAX5916 MAX5916A GND 7 PGOODA 8 PGOODB 9 AUXONA 10 AUXONB 11 3.3VAUXOA 12 MAX5915 MAX5915A MAX5916 MAX5916A 28 +12VIN 27 +12VOB 26 3.3VGATEB 25 3.3VSENB 24 3.3VOB 23 5VGATEA 22 5VSENA 21 5VOA 20 5VGATEB 19 5VSENB 18 5VOB 17 -12VOA 16 -12VIN 15 -12VOB
Figure 9. Kelvin Connections for Sense Resistors
Selector Guide
PART MAX5915EUI MAX5915AEUI MAX5916EUI MAX5916AEUI FAULT MANAGEMENT Latched Latched Autorestart Autorestart PGOOD_ FAULT RESPONSE TIME (S) 1.5m 100n 1.5m 100n
3.3VAUXIN 13 3.3VAUXOB 14
TSSOP
22
______________________________________________________________________________________
Dual PCI 2.2 Hot-Swap Controllers
Typical Operating Circuit
+12V 3.3VAUX -12V
MAX5915/MAX5915A/MAX5916/MAX5916A
+12VIN
3.3VAUXIN
-12VIN
PCI CARD A +12V -12V 3.3VAUX
PCI SLOT A +12VOA -12VOA 3.3VAUXOA 5VOA 5VSENA 5VGATEA ON OFF +5V ONA MAX5915 MAX5915A MAX5916 MAX5916A +12VOB -12VOB 3.3VAUXOB 5VOB 5VSENB 5VGATEB ON ONB OFF +5V
BACKPLANE
PCI SLOT B
PCI CARD B +12V -12V 3.3VAUX
+5V +3.3V GND +3.3V ON OFF PGOODA AUXONA 3.3VGATEA 3.3VSENA 3.3VOA GND PGOODB AUXONB 3.3VGATEB 3.3VSENB 3.3VOB +3.3V ON OFF
+5V +3.3V GND
______________________________________________________________________________________
23
Dual PCI 2.2 Hot-Swap Controllers MAX5915/MAX5915A/MAX5916/MAX5916A
Functional Diagram
+12VIN 3.3V -12VOA +12VOA 3.3VGATEA 3.3VSENA RSENSE 3.3VOA 5V 5VGATEA BIAS, BANDGAP REFERENCE, AND UVLO CHANNEL A CONTROL CHANNEL B CONTROL -12VOB +12VOB 3.3VGATEB -12VIN 3.3V
3.3VSENB RSENSE 3.3VOB 5V 5VGATEB
5VSENA RSENSE 5VOA VPULLUP
TEMPERATURE SENSOR MAX5915 MAX5915A MAX5916 MAX5916A CHARGE PUMP AND GATE CONTROL
5VSENB RSENSE VPULLUP
5VOB
ONA PGOODA
ONB PGOODB
AUXONA 3.3VAUXIN 3.3VAUXOA GND
AUXONB 3.3VAUXOB
24
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Dual PCI 2.2 Hot-Swap Controllers
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.)
MAX5915/MAX5915A/MAX5916/MAX5916A
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 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
TSSOP4.40mm.EPS

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