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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 back- planes by limiting the inrush current at startup. after startup, these devices provide protection against short- circuit, overcurrent, and undervoltage conditions. the max5915/max5915a/max5916/max5916a pro- vide 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 moni- tor two pci card slots. the max5915/max5915a offer latched fault protection and the max5916/max5916a offer autorestart fault pro- tection. the devices are available in the low-profile 28-pin tssop package. features ? pci 2.2 compliant ? 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 ? separate on/off control input for each channel ? 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 ? intelligent selective thermal shutdown control shuts down only the channel with an overcurrent fault ? 28-pin tssop package max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers ________________________________________________________________ maxim integrated products 1 19-2420; rev 2; 9/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information applications pci 2.2 server pci server raid part temp range pin-package max5915 eui* -40 c to +85 c 28 tssop max5915uui 0? to +85? 28 tssop max5915a eui* -40 c to +85 c 28 tssop max5915auui 0? to +85? 28 tssop max5916 eui* -40 c to +85 c 28 tssop max5916uui 0? to +85? 28 tssop max5916a eui* -40 c to +85 c 28 tssop max5916auui 0? to +85? 28 tssop selector guide, pin configuration, functional diagram, and typical operating circuit appear at end of data sheet. typical application circuit +12vin +3.3v +5v -12vin 3.3vgate_ 3.3vsen_ 3.3vo_ 5vgate_ 5vsen_ fairchild fds6670a fairchild fds6670a 0.005 ? 0.005 ? 10k ? 10k ? 5vo_ 5v 470 f 47 f 3.3vauxin 3.3vauxo_ pgood_ gnd on_ on off auxon_ +12vo_ -12vo_ max5915 max5915a max5916 max5916a 470 f 4.7 f ?? 0.1 f on off 4.7 f ?? 0.1 f 4.7 f ?? 0.1 f 47 f 47 f -12v +12v +3.3vaux * contact factory for availabilty.
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. +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 (t a = +70 c) 28-pin tssop (derate 23.8mw/ c above +70?) ...........1.9w operating temperature ranges: max591_u_ _ ......................................................0? to +85? max591_a u_ _ ...................................................0? to +85? max591_e_ _....................................................-40? to +85? max591_ ae_ _ ................................................-40? to +85? maximum junction temperature .....................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics (v -12vin = -12v, v +12vin = +12v, v 3.3vauxin = +3.3v, v on_ = v auxon_ = +5v, t a = t min to t max , unless otherwise specified. typical values are at t a = +25 c.) parameter symbol conditions min typ max units power supplies main supply input voltage range v +12vin 10.8 12 13.2 v main supply undervoltage lockout (uvlo) v +12uvlo v +12vin rising 9.6 10 10.8 v main supply uvlo hysteresis v uvlo, hys 100 mv main input uvlo delay time t deg, uvlo figures 1 and 2 (note 1) 1.6 ms supply current i q 2.5 5.0 ma +3.3v supply control gate charge current i 3.3vgate_ , chg v 3 .3 v gat e _ = + 6v , v 3 .3 v s e n _ = + 3.3v , v 3 .3 v o _ = + 3.3v 51530a gate discharge current i 3.3vgate_ , dis v 3.3vgate _ = +12v, v on_ = 0v 50 150 250 ? gate high voltage v 3.3vgate_ , high i 3.3vgate _ = 1? v +12vin - 0.5 v +12vin v gate low voltage v 3.3vgate_ , low i 3.3vgate _ = 1?, v on _ = 0v 0.1 0.4 v 3.3vo_ input bias current i 3.3vo_, bias v 3.3vo _ = +3.3v 20 ? 3.3vo_ internal pulldown r pd v on _ = 0v 1 k ? 3.3vsen_ input bias current i 3.3vsen_ , bias v 3.3vsen _ = +3.3v 10 ? current-limit threshold v 3.3v, lim v 3.3vgate _ = +6v 41 46 51 mv output undervoltage threshold v 3.3vin, uv v 3.3vgate _ falling 2.79 2.89 2.99 v output undervoltage threshold hysteresis 30 mv
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v -12vin = -12v, v +12vin = +12v, v 3.3vauxin = +3.3v, v on_ = v auxon_ = +5v, t a = t min to t max , unless otherwise specified. typical values are at t a = +25 c.) parameter symbol conditions min typ max units +5v supply control gate charge current i 5vgate _ , chg v 5vgate _ = +6v, v 5vsen _ = +5v, v 5vo _ = +5v 51530a gate discharge current i 5vgate _ , dis v 5vgate _ = +12v, v on _ = 0v 50 150 250 ? gate high voltage v 5vgate _ , high i 5vgate _ = 1? v +12vin - 0.5v v +12vin v gate low voltage v 5vgate _ , low i 5vgate _ = 1?, v on _ = 0v 0.1 0.4 v 5vo_ input bias current i 5vo _ , bias v 5vo _ = +5v 20 ? 5vo_ internal pulldown r 5vo _ , pd v on _ = 0v 1 k ? 5vsen_ input bias current i 5vsen _ , bias v 5vsen _ = +5v 10 ? current-limit threshold v 5vo _ , lim v 5vgate _ falling 27 31 35 mv output undervoltage threshold v 5vo _ , uv output falling 4.34 4.50 4.70 v output undervoltage threshold hysteresis 45 mv +12v supply control t a = +25?, i d = 0.5a 0.32 0.38 on-resistance of internal switch r ds(on), +12v t a = +85?, i d = 0.5a 0.5 ? foldback current limit i +12vin, lim v +12vo _ = 0v 0.68 1 1.36 a current-foldback threshold output current rising (note 2) 1.4 a output undervoltage threshold v +12vo _ , uv output falling 10.00 10.4 10.82 v +12vo_ internal pulldown r +12vo _ , pd v on _ = 0v 1 k ? -12v supply control t a = +25?, i d = 0.1a 0.58 0.9 on-resistance of internal switch r ds(on), -12v t a = +85?, i d = 0.1a 1.3 ? foldback current limit i -12vin, lim v -12vo_ = 0v 136 205 273 ma current-foldback threshold output current rising (note 2) 240 ma -12vo_ internal pullup r -12vo_, pu v on_ = 0v 1 k ? +3.3vaux supply control input voltage range v 3.3vauxin 3.0 3.3 3.6 v 3.3vauxin undervoltage lockout v uvlo, aux input rising 2.65 2.75 2.85 v hysteresis v uvlo-aux , hys 30 mv supply current i q, 3.3vaux 12ma
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 4 _______________________________________________________________________________________ electrical characteristics (continued) (v -12vin = -12v, v +12vin = +12v, v 3.3vauxin = +3.3v, v on_ = v auxon_ = +5v, t a = t min to t max , unless otherwise specified. typical values are at t a = +25 c.) parameter symbol conditions min typ max units t a = +25?, i d = 0.4a 0.24 0.4 on-resistance of internal switch r ds ( on ), 3.3vaux t a = +85?, i d = 0.4a 0.6 ? foldback current limit i 3.3vauxin , lim v 3.3vauxo _ = 0v 0.5 0.75 1.0 a current-foldback threshold output current rising (note 2) 1.2 a output undervoltage threshold v 3.3vauxin , uv 2.76 2.89 2.99 v auxiliary input uvlo delay time t deg, uvlo (note 1) 1.6 ms 3.3vauxo_ internal pulldown r 3.3vauxo_ on_ = 0v 1 k ? on and auxon comparators threshold voltage 1.0 2.1 v hysteresis v hys 25 mv input bias current i b, comp 20 ? on_ and auxon_ deglitch time t deg figures 5? (note 3) 4 s fault response, pgood_ status output comparators t resp figures 5? max5915/max5916 0.5 1.5 ms pgood_ output overcurrent and undervoltage response time t resp2 figures 5? max5915a/max5916a 100 ns output overcurrent and undervoltage deglitch time t delay figures 3? 16 x t resp ms pgood_ startup timeout t start see figures 1, 2, 5, 6, 7, and 8 4 x t delay ms autorestart delay t restart delay time to restart after oc and/or uv shutdown 64 x t start ms pgood_ output low voltage v ol i sink = 2ma, on_ = 0v 0.5 0.7 v pgood_ output high leakage current i leak v pgood_ = +5.5v 1 a thermal shutdown threshold t sd (note 4) 125 c thermal shutdown hysteresis t hys 5 c full thermal shutdown threshold t sd, full (note 5) t sd + 20 c full thermal shutdown hysteresis t hys, full 5 c note 1: t deg, uvlo is negative edge triggered. there is no time delay when the inputs rise above the uvlo threshold. note 2: the current threshold when the output current starts to fold back. see the typical operating characteristics . note 3: t deg is negative edge triggered. on_ or auxon_ transition from low to high has no delay. note 4: temperature threshold at which the outputs of the channel with overcurrent shut down. note 5: the temperature threshold at which both channels shut down.
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers _______________________________________________________________________________________ 5 typical operating characteristics (v +12vin = +12v, v 3.3vauxin = +3.3v, v -12vin = -12v, v 5v = +5v, v 3.3v = +3.3v, r 5vsen_ = 0.005 ? , r 3.3vsen_ = 0.005 ? , c 3.3vo_ = max5915 toc09 output current (a) 3.3vaux_ voltage (v) 1.05 0.90 0.60 0.75 0.30 0.45 0.15 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 2.5 0 1.20 3.3vaux_ voltage vs. output current 3.3vo_ sense resistor voltage vs. differential switch voltage max5915 toc08 v in - v 3.3vsen_ (v) 3.3vo_ current-limit threshold (mv) 30 34 32 36 38 42 46 44 48 40 3.0 2.5 1.5 2.0 1.0 3.5 during current limit fairchild fds6670a 3.3vo_ voltage vs. output current max5915 toc07 output current (a) 3.3vo_ voltage (v) 2 3.18 3.20 3.22 3.28 3.30 3.32 3.16 08 4 6 3.24 3.26 fairchild fds6670a 20 24 22 28 26 30 34 38 36 40 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5vo_ sense resistor voltage vs. differential switch voltage max5915 toc06 v in - v 5vsen_ (v) 5vo_ current-limit threshold (mv) 32 during current limit fairchild fds6670a 5vo_ voltage vs. output current max5915 toc05 output current (a) 5vo_ voltage (v) 1 4.82 4.84 4.86 4.88 4.90 4.92 4.80 05 23 4 4.94 4.96 4.98 5.00 5.02 fairchild fds6670a -12vo_ current foldback vs. differential switch voltage max5915 toc04 v -12vin - v -12vo_ (v) -12vo_ current foldback (ma) 2 50 100 150 200 250 0 04 6 8 10 12 -12vo_ voltage vs. output current max5915 toc03 output current (ma) -12vo_ voltage (v) 50 -12.0 -11.9 -11.8 -11.7 -11.6 -11.5 -12.1 0250 100 150 200 +12vo_ current foldback vs. differential switch voltage max5915 toc02 v +12vin - v +12vo_ (v) +12vo_ current foldback (a) 2 0.1 0.3 0.5 0.7 0.9 1.1 -0.1 0 4 6 8 10 12 +12vo_ voltage vs. output current max5915 toc01 output current (a) +12vo_ voltage (v) 1.0 0.5 11.5 11.6 11.7 11.8 11.9 12.0 12.1 11.4 0 1.5
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v +12vin = +12v, v 3.3vauxin = +3.3v, v -12vin = -12v, v 5v = +5v, v 3.3v = +3.3v, r 5vsen_ = 0.005 ? , r 3.3vsen_ = 0.005 ? , c 3.3vo_ = 2ms/div time-to-charge gate (c gate = 10nf) on_ 5v/div 3.3vgate_ 5v/div max5915 toc18 5vgate_ 5v/div 200 s/div time-to-charge gate (c gate = 1nf) on_ 5v/div 3.3vgate_ 5v/div max5915 toc17 5vgate_ 5v/div 100 s/div time-to-charge gate (c gate = 0.1nf) on_ 5v/div 3.3vgate_ 5v/div max5915 toc16 5vgate_ 5v/div max5915 toc15 temperature ( c) -12v internal switch r on ( ? ) 60 35 -15 10 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 -40 85 -12v internal switch r on vs. temperature max5915 toc14 temperature ( c) 3.3v auxiliary internal switch r on ( ? ) 60 35 10 -15 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0 -40 85 3.3v auxiliary internal switch r on vs. temperature max5915 toc13 temperature ( c) +12v internal switch r on ( ? ) 60 35 10 -15 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0 -40 85 +12v internal switch r on vs. temperature 5vgate_ and 3.3vgate_ discharge current vs. temperature max5915 toc12 temperature ( c) gate discharge current ( a) 60 35 10 -15 135 140 145 150 155 160 165 170 175 180 130 -40 85 3.3vgate_ c gate = 1nf 5vgate_ 5vgate_ and 3.3vgate_ charge current vs. temperature max5915 toc11 temperature ( c) gate charge current ( a) 60 35 10 -15 9.5 11.5 13.5 15.5 17.5 19.5 21.5 23.5 25.5 27.5 7.5 -40 85 3.3vgate_ c gate = 1nf 5vgate_ 3.3vaux_ current foldback vs. differential switch voltage max5915 toc10 v 3.3vauxin - v 3.3vauxo_ (v) 3.3vaux_ current foldback (ma) 0.5 550 600 650 700 750 800 500 0 1.0 2.0 2.5 3.0 1.5 3.5
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers _______________________________________________________________________________________ 7 typical operating characteristics (continued) (v +12vin = +12v, v 3.3vauxin = +3.3v, v -12vin = -12v, v 5v = +5v, v 3.3v = +3.3v, r 5vsen_ = 0.005 ? , r 3.3vsen_ = 0.005 ? , c 3.3vo_ = max5915 toc27 temperature ( c) +12v input uvlo threshold (v) 60 35 10 -15 9.6 9.7 9.8 9.9 10.0 10.1 10.2 10.3 10.4 10.5 9.5 -40 85 +12v input uvlo threshold vs. temperature 3.3v auxiliary input uvlo threshold vs. temperature max5915 toc26 temperature ( c) 3.3v auxiliary input uvlo threshold (v) 60 35 -15 10 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 2.5 -40 85 3.3v auxiliary output undervoltage threshold vs. temperature max5915 toc25 temperature ( c) 3.3v auxiliary output undervoltage threshold (v) 60 35 10 -15 2.8 2.9 3.0 3.1 3.2 3.3 2.7 -40 85 3.3v output undervoltage threshold vs. temperature max5915 toc24 temperature ( c) 3.3v output undervoltage threshold (v) 60 35 -15 10 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 2.5 -40 85 5v output undervoltage threshold vs. temperature max5915 toc23 temperature ( c) 5v output undervoltage threshold (v) 60 35 10 -15 4.43 4.48 4.53 4.58 4.63 4.68 4.38 -40 85 +12v output undervoltage threshold vs. temperature max5915 toc22 temperature ( c) +12v output undervoltage threshold (v) 60 35 10 -15 10.3 10.4 10.5 10.6 10.7 10.8 10.2 -40 85 on_ and auxon_ threshold vs. temperature max5915 toc21 temperature ( c) on_ and auxon_ threshold (v) 60 35 10 -15 1.85 1.90 1.95 2.00 rising falling 2.05 2.10 1.80 -40 85 3.3vauxin supply current vs. temperature max5915 toc20 temperature ( c) 3.3vauxin supply current (ma) 60 35 10 -15 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 0 -40 85 +12vin supply current vs. temperature max5915 toc19 temperature ( c) +12vin supply current (ma) 60 35 10 -15 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 2.0 -40 85
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 8 _______________________________________________________________________________________ typical operating characteristics (continued) (v +12vin = +12v, v 3.3vauxin = +3.3v, v -12vin = -12v, v 5v = +5v, v 3.3v = +3.3v, r 5vsen_ = 0.005 ? , r 3.3vsen_ = 0.005 ? , c 3.3vo_ = 40ms/div main supply turn-off waveforms on_ 5v/div +12vo_ 10v/div max5915 toc36 pgood_ 5v/div 5vo_ 5v/div 200 s/div turn-on delay +12vin 10v/div 3.3vauxin_ 2v/div max5915 toc35 3.3vauxo_ 2v/div +12vo_ 10v/div on_ = 5v auxon_ = 5v 10ms/div auxiliary supply turn-on waveforms auxon_ 5v/div 3.3vauxo_ 2v/div max5915 toc34 pgood_ 5v/div on_ = 5.0v 10ms/div main supply turn-on waveforms on_ 5v/div 12vo_ 10v/div max5915 toc33 pgood_ 5v/div 5vo_ 5v/div auxon_ = 5v 5vo_ sense resistor voltage vs. temperature max5915 toc32 temperature ( c) 5v0_ sense resistor voltage (mv) 60 35 -15 10 24 22 20 26 28 34 36 38 40 -40 85 32 30 during current limit 3.3v auxiliary current foldback vs. temperature max5915 toc31 temperature ( c) 3.3v axiliary current foldback (ma) 60 35 -15 10 475 550 625 700 775 850 925 -40 85 3.3vo_ sense resistor voltage vs. temperature max5915 toc30 temperature ( c) 3.3v sense resistor voltage (mv) 60 35 10 -15 37 39 41 43 45 35 -40 85 47 49 during current limit -12v output current foldback vs. temperature max5915 toc29 temperature ( c) -12v output current foldback (ma) 60 35 -15 10 130 150 170 190 210 230 250 -40 85 max5915 toc28 temperature ( c) +12v output current foldback (a) 60 35 10 -15 0.7 0.8 0.9 1.0 1.1 1.2 0.6 -40 85 +12v output current foldback vs. temperature
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers _______________________________________________________________________________________ 9 typical operating characteristics (continued) (v +12vin = +12v, v 3.3vauxin = +3.3v, v -12vin = -12v, v 5v = +5v, v 3.3v = +3.3v, r 5vsen_ = 0.005 ? , r 3.3vsen_ = 0.005 ? , c 3.3vo_ = -12vo_ current foldback max5915 toc45 2ms/div i -12vo_ 500ma/div pgood_ 5v/div -12vo_ 5v/div -12vo_ immediate short-circuit response max5915 toc44 200ns/div i -12vo_ 2a/div pgood_ 5v/div -12vo_ 5v/div +12vo_ current foldback max5915 toc43 2ms/div i +12vo_ 5a/div pgood_ 5v/div +12vo_ 5v/div +12vo_ immediate short-circuit response max5915 toc42 1 s/div i +12vo_ 10a/div pgood_ 5v/div +12vo_ 5v/div auxiliary supply fault management max5915 toc41 400ms/div 5vo_ +12vo_ 5v/div 3.3vauxo_ 5v/div pgood_ 5v/div 400ms/div main supply autorestart fault management +12vo_ 5v/div 5vo_ 2v/div max5915 toc40 3.3vauxo_ 5v/div pgood_ 5v/div 2ms/div main supply latched fault management +12vo_ 5v/div 5vo_ 2v/div max5915 toc39 3.3vauxo_ 5v/div pgood_ 5v/div 2 s/div t deg delay time on_ 5v/div 3.3vauxo_ 2v/div max5915 toc38 pgood_ 5v/div 20ms/div auxiliary supply turn-off waveforms on_ 5v/div 3.3vauxo_ 2v/div max5915 toc37 pgood_ 5v/div
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 10 ______________________________________________________________________________________ typical operating characteristics (continued) (v +12vin = +12v, v 3.3vauxin = +3.3v, v -12vin = -12v, v 5v = +5v, v 3.3v = +3.3v, r 5vsen_ = 0.005 ? , r 3.3vsen_ = 0.005 ? , c 3.3vo_ = 3.3vauxo_ current foldback max5915 toc51 2ms/div i 3.3vauxo_ 1a/div pgood_ 5v/div 3.3vauxo_ 2v/div 3.3vauxo_ immediate short-circuit response max5915 toc50 2 s/div i 3.3vauxo_ 10a/div pgood_ 5v/div 3.3vauxo_ 2v/div 3.3vo_ current limit max5915 toc49 2ms/div i 3.3vo_ 10a/div pgood_ 5v/div 3.3vo_ 2v/div 3.3vo_ immediate short-circuit response max5915 toc48 20 s/div i 3.3vo_ 10a/div pgood_ 5v/div 3.3vo_ 2v/div fairchild fds6670a 5vo_ current limit max5915 toc47 2ms/div i 5vo_ 10a/div pgood_ 5v/div 5vo_ 5v/div 5vo_ immediate short-circuit response max5915 toc46 40 s/div i 5vo_ 10a/div pgood_ 5v/div 5vo_ 5v/div fairchild fds6670a max5915a/max5916a 3.3vauxo_ short circuit max5915 toc54 100ns/div pgood_ 5v/div 3.3vauxo_ 1v/div t resp2 max5915a/max5916a 3.3vo_ short circuit max5915 toc53 100ns/div pgood_ 5v/div 3.3vo_ 1v/div t resp2 max5915a/max5916a 12vo_ short circuit max5915 toc52 100ns/div pgood_ 5v/div 12vo_ 5v/div t resp2
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers ______________________________________________________________________________________ 11 pin name function 1 +12voa channel a +12v output 2 3.3vgatea channel a +3.3v external n-channel mosfet gate drive. 3.3vgatea driven by +12vin. 3 3.3vsena channel a external 3.3v current-sense input 4 3.3voa channel a +3.3v output sense 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. 12 3.3vauxoa channel a 3.3vaux output 13 3.3vauxin 3.3vaux input. provides power to the +3.3v auxiliary channels. 14 3.3vauxob channel b 3.3vaux output 15 -12vob channel b -12v output 16 -12vin -12v input 17 -12voa channel a -12v output 18 5vob channel b +5v output sense 19 5vsenb channel b external +5v current-sense input 20 5vgateb channel b +5v external n-channel mosfet gate drive. 5vgateb driven by +12vin. 21 5voa channel a +5v output sense 22 5vsena channel a external +5v current-sense input 23 5vgatea channel a +5v external n-channel mosfet gate drive. 5vgatea driven by +12vin. 24 3.3vob channel b +3.3v output sense 25 3.3vsenb channel b external +3.3v current-sense input 26 3.3vgateb channel b +3.3v external n-channel mosfet gate drive. 3.3vgateb driven by +12vin. 27 +12vob channel b +12v output 28 +12vin +12v input. +12vin powers the main supplies of the max5915/max5915a/max5916/max5916a. pin description
max5915/max5915a/max5916/max5916a detailed description the max5915/max5915a/max5916/max5916a are cir- cuit-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? 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 limit- ing 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 stan- dards dictate maximum values for the supply power and total power drawn from the backplane. the maxi- mum 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 these devices. the main supply outputs (3.3vo_, 5vo_, +12vo_, and -12vo_) can become active only after both of the following events have occurred: ? +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 auxiliary supply is not used. the auxiliary supply (3.3vauxo_) is available after both of these events have occurred: ? 3.3vauxin is above its uvlo threshold. auxon_ is driven high. normal operation +3.3v, +5v, 12v outputs the internal circuitry for these devices monitors the out- put voltage on all channels except the -12v supply. all outputs are monitored for overcurrent. an undervoltage condition occurs when any supply? 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 under- voltage level, or if any of the monitored output currents reach their overcurrent threshold, for a time period, t delay , 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? main outputs to shut down after t delay and then either latch off (max5915/max5915a) or auto- matically restart after t restart (max5916/max5916a). a fault on any of the channel? main outputs does not affect the channel? auxiliary outputs. normal operation +3.3v auxiliary output auxiliary output voltage and current are monitored inter- nally. 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 out- puts 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 12 ______________________________________________________________________________________ table 1. pci standard maximum values supply voltage (v)* voltage tolerance (%) max current (a) max power (w) +5 5525 +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.
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 t delay . all outputs are automatically restarted after a time equal to t restart . this reset is built into all devices. current limits all supplies are protected against output overcurrent or short-circuit conditions. the max5915/max5915a and max5916/max5916a employ a ?rickwall?current limit on the +3.3v and +5v supplies and a current-foldback scheme on the ?2v 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 t delay if the fault remains. the brick- wall feature limits inrush current caused by positive supply voltage steps. foldback the ?2v 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 tran- sient, the output current is reduced to the foldback cur- rent limit and remains at that level for t delay unless the overcurrent condition is cleared. see the typical operating characteristics . max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers ______________________________________________________________________________________ 13 t start on_ +12vin 3.3vauxin pgood_ timing not to scale auxon_ +12v uvlo threshold 3.3vaux uvlo threshold +12vo_ 5vo_ 3.3vo_ 3.3vauxo_ -12vo_ figure 1. startup waveforms
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 t deg,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/max5915a/max5916/max5916a disable the channel outputs after t delay . a fault occurs when any of the output voltages fall below their output undervoltage threshold or any of the output currents exceed their out- put overcurrent threshold. pgood_ pulls low if a fault persists for more than t resp . the channel with the fault is disabled after t delay . the max5915/max5916 are avail- able with a response time of 1.5ms (t resp ). the max5915a/max5916a offer a response time of 100ns (t resp2 ). if the fault is removed before t delay , the chan- nel remains on and pgood_ pulls high immediately. latched fault protection the max5915/max5915a latch off the appropriate channel? 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 out- puts after t restart . the max5915/max5915a/ max5916/max5916a handle faults on the auxiliary out- puts by automatically restarting the appropriate chan- nel. 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/max5915a/max5916/max5916a. dual pci 2.2 hot-swap controllers 14 ______________________________________________________________________________________ on_ +12vin 3.3vauxin pgood_ auxon_ +12v uvlo threshold 3.3vaux uvlo threshold t start t start t deg.uvlo t deg.uvlo +12vo_ 5vo_ 3.3vo_ 3.3vauxo_ -12vo_ timing not to scale figure 2. input uvlo fault management in the max5915/max5915a/max5916/max5916a
output undervoltage the output voltages on all supplies, except the -12v supply, are monitored for undervoltage. output under- voltage 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. 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 sec- ond 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 chan- nels 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 t restart . pgood_ operation the max5915/max5915a/max5916/max5916a incor- porate 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 avail- able. 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 resis- tor (see the functional diagram ). figure 8 shows the internal logic of the pgood_ output. max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers ______________________________________________________________________________________ 15 t delay t delay t delay t restart t restart enable_+12vin startup_+12vin oc_3.3vauxo_ uv_3.3vauxo_ reset reset dq v q positive edge triggered d flip-flop, reset is active low oc_3.3vo_ oc_5vo_ oc_+12vo_ oc_-12vo_ uv_3.3vo_ uv_5vo_ uv_+12vo_ positive edge triggered d flip-flop, reset is active low high = main supplies are turned off main on aux off high = aux supply turned off enable_3.3vauxin startup_3.3vauxin v = internal supply logic generated by the 12vin or the 3.3vauxin, whichever is higher reset dq v q see table 2 for explanation of signals. figure 3. main and auxiliary supply shutdown control logic for max5915/max5915a
max5915/max5915a/max5916/max5916a applications information component selection external mosfets select the external n-channel mosfets according to the application? current requirement. limit switch power dissipation by choosing a mosfet with an r ds(on) low enough to have a minimum voltage drop at full load. high r ds(on) causes output ripple if the board has pulsing loads. high r ds(on) can trigger an external undervoltage fault at full load. determine the mosfet? power rating requirement to accommodate a short-cir- cuit 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: r sense = (v- ilim / i load ) where i load is the brickwall current limit for the output. choose the sense resistors?power rating to accommo- date the overload current: p sense = (i load ) 2 x r sense 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 16 ______________________________________________________________________________________ t delay t delay t delay t restart t restart t restart enable_+12vin startup_+12vin oc_3.3vauxo_ uv_3.3vauxo_ reset reset reset dq v q positive edge triggered d flip-flop, reset is active low oc_3.3vo_ oc_5vo_ oc_+12vo_ oc_-12vo_ uv_3.3vo_ uv_5vo_ uv_+12vo_ positive edge triggered d flip-flop, reset is active low high = main supplies are turned off main off aux off high = aux supply turned on enable_3.3vauxin startup_3.3vauxin v = internal supply logic generated by the 12vin or the 3.3vauxin, whichever is higher reset dq v q see table 2 for explanation of signals. figure 4. main and auxiliary supply shutdown control logic for max5916/max5916a
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 start- up time. each supply has its own current-limit threshold. calculate the maximum load capacitance as follows: c board < 50ms x i _, lim / v supply 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 t deg, uvlo . external mosfet thermal considerations the power dissipation of the external mosfet is low when it is on, p d = i load 2 x r ds(on) . a considerable amount of power is dissipated during startup and con- tinuous short-circuit conditions. the design must take into consideration the worst-case scenario. layout considerations to take full advantage of the switch response time to an output fault condition, keep all traces as short as possi- ble 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? 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 tempera- ture 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. chip information transistor count: 1021 process: bicmos max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers ______________________________________________________________________________________ 17 table 2. logic diagram signal descriptions signal name description enable_+12vin signal is high: 1. +12vin > v uvlo, +12v 2. on_ = high 3. thermal shutdown not active startup_+12vin signal is high: 1. +12vin > v uvlo, +12v 2. on_ = high 3. t start has elapsed enable_3.3vauxin signal is high 1. 3.3vauxin > v uvlo, aux 2. auxon_ = high 3. thermal shutdown not active startup_3.3vauxin signal is high: 1. 3.3vauxin > v uvlo, aux 2. auxon_ = high 3. t start 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.
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 18 ______________________________________________________________________________________ +12v uvlo threshold on_ +12vin pgood_ iout (+12vo_, 5vo_, 3.3vo-, or -12vo_) overcurrent threshold t start t delay t deg t resp (t resp2 ) +12vo_ 5vo_ 3.3vo_ 3.3vauxo_ -12vo_ output undervoltage fault handling results in similar response. timing not to scale. ( ) for max5915a. figure 5. main outputs overcurrent fault management in the max5915/max5915a
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers ______________________________________________________________________________________ 19 +12v uvlo threshold on_ pgood_ iout (3.3vauxo_) overcurrent uvlo threshold t start t restart t deg +12vo_ +12vin 5vo_ 3.3vo_ 3.3vauxo_ -12vo_ t delay t resp (t resp2 ) 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
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 20 ______________________________________________________________________________________ +12v uvlo threshold on_ pgood_ iout (+12vo_, 5vo_, 3.3vo_, or- 12vo_) overcurrent threshold t start t restart +12vo_ +12vin 5vo_ 3.3vo_ 3.3vauxo_ -12vo_ t delay t resp (t resp2 ) 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
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers ______________________________________________________________________________________ 21 gnd pgood_ t start t start on_ uvlo_+12vin auxon_ uvlo_3.3vauxin oc_main_outputs uv_main_outputs oc_3.3vauxo_ uv_3.3vauxo_ t deg t deg t deg t deg, uvlo t deg, uvlo t deg, uvlo t resp t resp (t resp2 ) ( ) for max5915a/max5916a. figure 8. pgood_ logic diagram
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 22 ______________________________________________________________________________________ table 3. component manufacturers component manufacturer phone website dale-vishay 402-564-3131 www.vishay.com sense resistors irc 704-264-8861 www.irctt.com fairchild 888-522-5372 www.fairchildsemi.com international rectifier 310-322-3331 www.irf.com mosfets motorola 602-244-3576 www.mot-sps.com/ppd/ sense resistor high-current path max5915 max5915a max5916 max5916a figure 9. kelvin connections for sense resistors 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 +12vin +12vob 3.3vgateb 3.3vsenb 3.3vob 5vgatea -12vob 5vsena 5voa 5vgateb 5vsenb 5vob -12voa -12vin 3.3vauxob 3.3vauxin 3.3vauxoa auxonb auxona pgoodb pgooda gnd onb ona 3.3voa 3.3vsena 3.3vgatea +12voa tssop top view max5915 max5915a max5916 max5916a pin configuration selector guide part fault management pgood_ fault response time (s) max5915 eui latched 1.5m max5915a eui latched 100n max5916 eui autorestart 1.5m max5916a eui autorestart 100n
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers ______________________________________________________________________________________ 23 on off on off on off on off max5915 max5915a max5916 max5916a pci slot b pci slot a gnd gnd gnd 3.3vauxoa 3.3vauxob 5vgatea 5vsena 5voa 5vgateb 5vsenb 5vob 3.3vgatea 3.3vsena 3.3voa 3.3vgateb 3.3vsenb 3.3vob +12voa -12voa +12vob -12vob +12vin -12vin 3.3vauxin +12v 3.3vaux -12v +5v +5v +3.3v +3.3v backplane +12v -12v 3.3vaux +5v +3.3v +12v -12v 3.3vaux +5v +3.3v ona onb pgooda pgoodb auxona auxonb pci card b pci card a typical operating circuit
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers 24 ______________________________________________________________________________________ -12vin +12vin -12vob +12vob 3.3vauxob 5v 5vsenb 5vob 5vgateb 3.3v 3.3vgateb r sense r sense 3.3vsenb 3.3vob gnd -12voa +12voa 3.3vauxoa 3.3v 3.3vgatea 3.3vsena 5v 5vsena r sense r sense 3.3voa 5voa 5vgatea 3.3vauxin ona auxona pgooda v pullup channel b control channel a control charge pump and gate control temperature sensor bias, bandgap reference, and uvlo pgoodb onb v pullup auxonb max5915 max5915a max5916 max5916a functional diagram
max5915/max5915a/max5916/max5916a dual pci 2.2 hot-swap controllers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it 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 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) tssop4.40mm.eps package outline, tssop 4.40mm body 21-0066 1 1 g

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