MAXIM INTEGRATED PRODUCTS Dual PCI Express Hot-Plug Controller MAX5946 handbook
Contents
1. CONTROL LOGIC CONTROL LOGIC AUX SLOT A AUX SLOT B 3 3VAUXOA y 3 3VAUXOB INPUT COMPARATORS AND CHIP CONTROL LOGIC ONA AUXONA PRES DEIA AUXONB FONB Figure 1 Functional Diagram 14 AVLAZXL VI Table 1 Power Requirements for PCI Express Connectors POWER RAIL X1 CONNECTOR X4 8 CONNECTOR X16 CONNECTOR Dual PCI Express Hot Plug Controller Voltage Tolerance 9 max 9 max 9 max Supply Current 3 0A max 3 0A max 3 0A max Capacitive Load Voltage Tolerance 1000yF max 8 max 1000yF max 8 max 1000yF max 8 max Supply Current 0 5A max 2 1A max 5 5A max Capacitive Load 3 3V AUXILIARY 300uF max 1000yF max 2000yF max Voltage Tolerance 9 max 9 max 9 max Supply Current Wake Enabled Supply Current Non Wake Enabled 375mA max 20mA max 375mA max 20mA max 375mA max 20mA max Capacitive Load 150yF max Table 2 Control Logic Truth Table 150yF max PRES DET 12V AND 3 3V_ OUTPUTS 150yF max 3 3VAUXO_ AUXILIARY OUTPUTS PRES DET high to low transition has a 4ms delay tDEG Startup The main supply outputs can become active on2. TIS EVA A LABL General Description The MAX5946 dual hot plug controller is designed for PCI Express applications The device provides hot plug control for 12V 3 3V and 3 3V auxiliary supplies of two PCI express slots The MAX5946 s logic inputs out puts allow interfacing directly with the system hot plug management controller or through an SMBus with an external I O expander An integrated debounced atten tion switch and present detect signals are included to simplify system design The MAX5946 drives four external n channel MOSFETs to control the 12V and 3 3V main outputs The 3 3V aux iliary outputs are controlled through internal 0 3Q n channel MOSFETs Internal charge pumps provide gate drive for the 12V outputs while the gate drive of the 3 3V output is driven by the 12V input supply The 3 3V auxiliary outputs are completely independent from the main outputs with their own charge pumps At power up the MAX5946 keeps all of the external MOSFETs off until the supplies rise above their respec tive undervoltage lockout UVLO thresholds The device keeps the internal MOSFETs off only until the auxiliary input supply rises above its UVLO threshold Upon a turn on command the MAX5946 enhances the external and internal MOSFETs slowly with a constant gate current to limit the power supply inrush current The MAX5946 actively limits the current of all outputs at all times and shuts down if an overcurrent cond
3. PORADJ Detailed Description The MAX5946 dual hot plug controller is designed for PCI express applications The device provides hot plug control for 12V 3 3V and 3 3V auxiliary supplies of two PCI express slots The MAX5946 s logic inputs outputs allow interfacing directly with the system hot plug man agement controller or through an SMBus with an exter nal I O expander An integrated debounced attention switch and present detect signals are included to sim plify system design The MAX5946 drives four external n channel MOSFETs to control the 12V and 3 3V main outputs The 3 3V aux outputs are controlled through internal 0 240 n channel MOSFETs Internal charge pumps provide a gate drive for the 12V outputs while the gate drive of the 3 3V output is driven by the 12V input supply The 3 3V auxiliary outputs are completely independent from the main outputs with their own charge pumps Power On Reset Programming Input Connect a resistor between 5000 and 500kQ from PORADJ to GND to program the POR timing Leave floating for a default value of 160ms At power up the MAX5946 keeps all of the external MOSFETs off until all supplies rise above their respec tive UVLO thresholds The device keeps the internal MOSFETs off only until the 3 3VAUXIN supply rises above its UVLO threshold Upon a turn on command the MAX5946 enhances the external and internal MOSFETS slowly with a constant gate current to limit the power s
4. 3 3VAUXO_ OUTPUT VOLTAGE 2V d iv FAULT_ 5V d iv 3 3VAUX0_ OUTPUT CURRENT 500mA div 3 3VAUX0_ OUTPUT VOLTAGE 2V d AUXO 5V d FAUL 5V d iv iv iv 9P6SXVIN MAX5946 Dual PCI Express Hot Plug Controller 10V div SV div 5V div SV div 10V div 5V div 5V div 5V div 10 Typical Operating Characteristics continued V42VIN V42SA 12V V3 3VAUXIN V3 3S_ VON VAUXON_ VINPUT_ 3 3V PRES DET_ GND FON_ PORADJ TIM float FAULT_ 10kQ to 3 3VAUXIN PWRGDA 10kQ to 3 3VAUXO_ TA 25 C unless otherwise noted see the Typical Application Circuit POWER UP INTO FAULT 3 3V MAIN MAX5946 toc34 RioAD 050 3 3V OUTPUT CURRENT 4A div 3 3G_ 5V div 3 3V 0UTPUT VOLTAGE 2V div ON_ AUXON 5V div FAULT_ 5V div 4ms div PRESENT DETECT ON OFF OPERATION MAX5946 toc36 12V OUTPUT VOLTAGE 3 3VAUXO_ OUTPUT VOLTAGE PWRGD PRES DET_ 40ms div FORCED ON ON OFF OPERATION MAX5946 toc38 12V OUTPUT VOLTAGE 3 3VAUXO_ OUTPUT VOLTAGE HHHH PWRGD FON_ 40ms div POWER UP INT0 FAULT 12V 0UTPUT MAX5946 toc35 2V OUTPUT CURRENT 5A div 26 10V div 2V OUTPUT VOLTAGE OV div ON_ AUXON_ 5V div FAULT_ 5V div 4ms div PRESENT DETECT ON OFF OPERATION MAX5946 toc37 10V div 12V OUTPUT VOLTAGE 3 3VAUX0_ 5V div OUTPUT VOLTAGE 5V div PWRGD 5V div 4
5. PRSNT2 21 9P6SXVIN MAX5946 Dual PCI Express Hot Plug Controller 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 TERMINAL FOR ODD TERMINAL SIDE R RMINA 22 SECTION C C SCALE NONE 36L 40L QFN EPS Nd 1 X e REF BOTTOM VEW 7m STANDARD DETAIL A PIN if ID AND TIE BAR MARK OPTIONS DALLAS AML AAL VI TITLE PACKAGE DUTLINE 36 40L QFN 6x6x0 90 MM DOCUMENT CONTROL ND REV 1 MAKLM Dual PCI Express Hot Plug Controller Package Information continued 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 COMMON DIMENS ED PAD VARIATI PKG 36L 6x6 40L 6x6 ze MIN NOM MIN SYMBOL MIN NOM MAX NOM 55 0 80 0 0 100 0 90 355 000 001 005 0 01 0 00 0 65 0 80 0 65 NOTES 1 DIE THICKNESS ALLOWABLE IS 0 305mm MAXIMUM 012 INCHES MAXIMUM 0 20 REF 0 20 REF 2 DIMENSIONING amp TOLERANCES CONFORM TO ASME Y14 5M 1994 023 0 30 0 23 A N IS THE NUMBER OF TERMINALS 6 00 610 6 00 Nd IS THE NUMBER OF TERMINALS IN X DIRECTION amp 575 BSC 5 75 BSC Ne IS THE NUMBER OF TERMINALS IN Y DI
6. See 3 3GA function 12 MAALM Dual PCI Express Hot Plug Controller Pin Description continued FUNCTION S B 3 3V Negative Current Sense Input See 3 3SA function B 3 3V Positive Current Sense Input Connect the positive side of the current sense resistor to B using the Kelvin sensing technique to assure accurate current sensing B 12V Gate Drive Output See 12GA function B 12V Positive Current Sense Input See 12SA function AUXONB B 3 3V Auxiliary Output Enable See AUXONA function S 3 S S 12SB S S ONB S S B 12V And 3 3V Outputs Enable See ONA function FONB B Forced On Input See FONA function PRES DETB S o 3 o ot B 12V Negative Current Sense Input See 12SA function o B Present Detect Input See PRES DETA function TIM INPUT2 Digital Logic Gate Input Overcurrent Timeout Programming Input Connect a resistor between 5000 and 500kQ from to GND to program tFAULT Leave TIM floating for a default timeout of 11ms OUTPUT2 Digital Output 4ms debounced digital output of INPUT2 OUTPUT Digital Output 4ms debounced digital output of INPUT1 12V Supply Input V42vIN drives the gates of the MOSFETs connected to 3 3GA and 3 3GB 12VIN powers an internal charge pump that drives the gates of the MOSFETs connected to 12GA and 12GB Ground PGND Power Ground Connect externally to GND
7. 9P6SXVIN MAX5946 Dual PCI Express Hot Plug Controller Typical Operating Characteristics continued V42VIN V42SA 12V V3 3VAUXIN V3 3S_ VON VAUXON_ VINPUT_ 3 3V PRES DET_ GND FON_ PORADJ TIM float FAULT_ 10kQ to 3 3VAUXIN PWRGDA 10kQ to 3 3VAUXO TA 25 unless otherwise noted see the Typical Application Circuit 12VIN UNDERVOLTAGE LOCKOUT THRESHOLD vs TEMPERATURE 10 20 MAX5946 toc10 10 15 10 10 110 05 D V 10 00 e to e UVLO THRESHO e teo e e e e 40 15 10 35 60 85 TEMPERATURE C MAX5946 toc12 12V TURN ON OFF TIME 12V OUTPUT 10V div 126 20V div ON 5V div i He PWRGD_ 5V div 40ms div 3 3V AUXILIARY TURN ON OFF TIME MAX5946 toc14 3 3AUX0_ OUTPUT VOLTAGE 2V div PWRGD 2V div AUXON_ 2V div 40ms div UVLO THRESROLD V e a 2 e aD E Ds 2 N a e 3 3VAUXIN UNDERVOLTAGE LOCKOUT THRESHOLD vs TEMPERATURE MAX5946 toc11 TEMPERATURE C 3 3V TURN ON OFF TIME MAX5946 toc13 3 3V OUTPUT 5V div 3 3G_ 10V div i i CCHHHHRHHHHHHHEHHHHHHHHHREHHHRHHHRHHH HR HH I ON 5V div PWRGD_ 5V div 40ms div 12V POWER UP MAX5946 toc15 126 20V div 12V OUTPUT 10V div 12VIN 12V INPUT 10V div PWRGD_ 5V div 40
8. COUNTING tsu POWER ON MAIN SUPPLIES FAULT AND PWRGD ARE HIGH IMPEDANCE 3 3AUXIN IS ON AND ABOVE UVLO ARE PWRGD _RESET_ THRESHOLDS PWRGD_ REACHED AFTER 1 DELAY STAY WAITING FOR BOTH ON_ AND AUXON_ TRANSITION RESET FAULT_ AND RESTART ALL SUPPLIES ASSERT PWRGD_ AFTER _ DELAY HIGH gt LOW gt HIGH Y POWER ON AUXILIARY SUPPLIES FAULT AND PWRGD ARE LATCH OFF HIGH IMPEDANCE OPTION ENABLE CHARGE ON INTERNAL AUXILIARY MOSFET BEGIN COUNTING tsu HAS tsy ELAPSED SHUT DOWN Assent EU START COUNTING WAS CURRENT LIMIT AUX SUPPLY OUTPUT ELAPSED FAULT DETECTED ON AUXILIARY IS ENABLED STAY WAITING FOR OUTPUT tpestarr ELAPSED IS FAULT STILL PRESENT RESET trAULT COUNTER Figure 6 Fault Management Flow Chart 18 MAKII Dual PCI Express Hot Plug External MOSFET Gate Drivers 12GA 12GB 3 3GA and 3 3GB The gate drive for the external MOSFETs is provided at 12GA 12GB 3 3GA and 3 3GB 12G_ is the gate drive for the 12V main supply and is boosted to 5 3V above V12VIN by an internal charge pump During turn on 12G_ sources 5yA into the external gate capacitance to control the turn on time of the external MOSFET During turn off 12G_ sinks 150 from the external gate c
9. programmable time period tFAULT see the Fault Management section Power Good PWRGD Power good PWRGD_ is an open drain output that pulls low a time HL after all of the outputs of the respective slot are fully on All outputs are considered fully on when 3 3G_ has risen to VPGTH3 3 12G_ has risen to VPGTH12 and V3 3AUXO Iis less then VPGTH3 3AUX tPOR HL is adjustable from 2 5ms to 1 5s by connecting a resistor from PORADJ to GND See the Setting the Power On Reset Timeout Period tPOR section Thermal Shutdown When the die temperature goes above Tsp 150 C an overtemperature fault occurs and the MAX5946 shuts down all outputs The device waits for the junction temper ature to decrease below Tsp Hysteresis before entering fault management see the Fault Management section MAKII Dual PCI Express Hot Plug FAULT Management A fault occurs when an overcurrent lasts longer then tFAULT or when the device experiences an overtemper ature condition e A fault on a main output 12V or 3 3V shuts down both main outputs of the respective slot The 3 3V auxiliary is not affected e A fault on the 3 3V auxiliary output shuts down all three outputs of the respective slot The MAX5946A automatically restarts from a fault shut down after the tRESTART period while the MAX5946L latches off If an overcurrent fault occurred on a main output bring ON low for at least tRESET 100us and high again to reset the f
10. 6 toc27 a STEP TO4O 3 3VAUXO_ OUTPUT CURRENT 2V OUTPUT CURRENT 500mA div 5A div 26 20V div nar OUTPUT VOLTAGE 2V OUTPUT VOLTAGE OV div FAULT_ 2V div FAULT_ 5V div 4ms div 2ms div MAXIM V12VIN V42SA 12V V3 3VAUXIN V3 3S_ VON_ VAUXON_ VINPUT_ 3 3V PRES D Dual PCI Express Hot Plug Controller Typical Operating Characteristics continued ET GND FON PORADJ TIM float FAULT_ 10kO to 3 3VAUXIN PWRGDA 10kQ to 3 3VAUXO_ TA 25 unless otherwise noted see the Typical Application Circuit SHORT CIRCUIT ON 12V OUTPUT MAX5946 toc28 4us div SHORT CIRCUIT ON 3 3V OUTPUT MAX5946 toc30 2us div SHORT CIRCUIT ON 3 3VAUXO MAX5946 toc32 2us div 12V OUTPUT CURRENT 25A div 126 20V div OV 12V OUTPUT VOLTAGE 10V div OV FAULT_ 5V div OV 3 3V OUTPUT CURRENT 10A div 336 5V div 3 3V OUTPUT VOLTAGE SV div FAULT_ 5V div OV 3 3VAUXO_ OUTPUT CURRENT 5A div 3 3VAUXO_ OUTPUT VOLTAGE 2V div FAULT_ 5V div SHORT CIRCUIT ON 3 3V OUTPUT MAX5946 toc29 i CCHHHRHHRHHHRHRREHHHHHHHHHHHHR EH HR E HH HH fH 2ms div SHORT CIRCUIT ON 3 3AUXO MAX5946 toc31 2ms div POWER UP INTO FAULT AUXILIARY SUPPLY MAX5946 toc33 u 4ms div 3 3V 2 3 3G 5V 3 3V 5V OUTPUT CURRENT iv iv OUTPUT VOLTAGE iv FAUL SV di 3 3VAUXO_ OUTPUT CURRENT 500mA div
11. DET_ high and the respective slot is shut down with no delay PRES DET_ works in conjunction with ON_ and VAUXON_ and only enables the device when ON_ and VAUXON_ are high A logic low on FON_ forces the respective slot main supplies and auxiliary to turn on regardless of the sta tus of the other logic inputs provided the UVLO thresh olds are exceeded on all of the inputs Active Current Limits Active current limits are provided for all three outputs of slot A and slot B Connect a current sense resistor between 12S_ and 12S_ to set the current limit for the 12V outputs The current limit is set to 54mV RSENSE12 RSENSE12 is either R1 or R3 in the Typical Application Circuit Connect a current sense resistor between 3 3S_ and 3 38 to set the current limit for the 3 3V main outputs to 20mV RsENSE3 3 RSENSE3 3 is either R2 or R4 in the Typical Application Circuit For the auxiliary output 3 3VAUxoO the current limit is fixed at 470 When the voltage across RSENSE12 or RSENSE3 3 reaches the current limit threshold voltage the MAX5946 regulates the gate voltage to maintain the current limit threshold voltage across the sense resis tor If the current limit lasts for tFAULT then an overcur rent fault occurs The MAX5946_ shuts down both the 12V and 3 3V outputs and asserts the FAULT_ output of the respective slot When the auxiliary output reaches the current limit 470mA for longer then tFAULT a fault occurs and the devic
12. ERATURE 505 20 a 20 z 504 2 e E 503 B 1 8 E 1 9 502 16 gd 14 17 0 500 9 0 499 Z 12 5 16 amp 0 498 gt ON_ OR AUXON_ 5 2 10 a 15 0497 o 0 496 22 08 14 85 0495 5 06 42 0 494 EC 0 493 04 12 492 0491 s 0 490 0 10 4 45 1 35 60 85 4 5 1 35 60 85 40 5 10 35 60 85 TEMPERATURE C TEMPERATURE C TEMPERATURE C 126 AND 3 3G_ GATE CHARGE 12G_ AND 3 3G_ GATE DISCHARGE 3 3VAUX0_ 0UTPUT VOLTAGE vs CURRENT CURRENT vs TEMPERATURE CURRENT vs TEMPERATURE 35 535 70 _ ee 525 X 165 25 520 E X m amp 3 36 cc JU amp 515 100 1 cu gt 510 e 15 g 505 5 155 8 fa 126 1 500 N S 4 95 S 150 05 485 45 0 01 02 03 04 05 06 4 5 10 35 60 85 40 15 1 35 60 85 OUTPUT CURRENT A TEMPERATURE C TEMPERATURE C 3 3VAUX INTERNAL SWITCH 12V AND 3 3V CURRENT LIMIT THRESHOLD AUXILIARY CURRENT LIMIT MAXIMUM DROPOUT vs TEMPERATURE VOLTAGE vs TEMPERATURE vs TEMPERATURE 60 8 0 500 AUXILIARY OUTPUT CURRENT 375mA lt E E 045 8 6 5 NEM E P ow 12V CURRENT SENSE 0490 THRESHOLD m 40 04 0 480 d s 2 3 3 3V CURRENT SENSE amp 0475 U 5 THRESHOLD 2 2 0 470 e e a 0 465 2 10 0 460 a 0 455 0 0 450 40 15 10 35 6 85 4 5 10 35 60 85 40 5 10 35 60 85 TEMPERATURE TEMPERATURE TEMPERATURE 5
13. N 12G_ Threshold Voltage For PWRGD_ Assertion Note 2 VPGTH12 Referred to Viavin l12G_ 19A 4 28 Input Bias Current 4 2S_ Input Bias Current 3 3V SUPPLY V3 3SA 3 3V Supply Voltage Range pply 9 9 V33SB Undervoltage Lockout 3 3SA rising Note 3 Hysteresis AVLAXL VI Dual PCI Express Hot Plug ELECTRICAL CHARACTERISTICS continued Vi2VIN 125_ V42S_ TIM OUTPUT 12G 3 3G_ OP Typical values are at TA 25 C Note 1 PARAMETER SYMBOL CONDITIONS Controller 12V V3 3S_ V3 3S_ V3 3VAUXIN VON VAUXON_ VFON__ 3 3V PWRGD_ FAULT_ PORADJ EN INPUT PRES_DET_ PGND GND TA 40 to 85 unless otherwise noted 3 3V CONTROL 3 3V Current Limit Threshold Va 3s V3 3S_ V3 3ILIM 3 3G_ Gate Charge Current 13 3G_CHG GND 3 3G_ Gate Discharge Current 13 3G_DIS ON_ GND V3 3G_ 2V Output short circuit condition strong gate pulldown to regulation V3 35 V3 3S_ gt 1V 5V 3 3G_ Gate High Voltage V3 3G_ V3 3S_ 3 3G_ Threshold Voltage For PWRGD_ Assertion Note 2 V3 3G_H VPGTH3 3 Sourcing 1 Referred to V3 3VAUXIN 13 3G_ 1HA 3 38 Input Bias Current 3 38 Input Bias Current 3 3V AUXILIARY SUPPLY 3 3VAU Range N Supply Voltage N Undervoltage V3 3VAUXIN 3 3VAUXIN rising Hysteresis N Supply C
14. PRES DET 4ms div FORCED ON ON OFF OPERATION MAX5946 toc39 10V div 12V OUTPUT VOLTAGE 3 3VAUXO_ 5V div OUTPUT VOLTAGE 5V div 5V div 4ms div MAXIM Dual PCI Express Hot Plug Controller Typical Operating Characteristics continued V42VIN V42SA 12V V3 3VAUXIN V3 3S_ VON VAUXON_ VINPUT_ 3 3V PRES DET_ GND FON_ PORADJ TIM float FAULT_ 10kQ to 3 3VAUXIN PWRGDA 10kQ to 3 3VAUXO TA 25 C unless otherwise noted see the Typical Application Circuit DEBOUNCED ON OFF OPERA 10ms div trAuLT ms TION MAX5946 toc40 POWER ON RESET TIME vs PORADJ RESISTOR MAX5946 toc41 INPUT_ 2200 2V div 2000 OUTPUT_ 2V div 0 100 200 300 400 500 600 700 800 9 trauct TIME DELAY vs TIM RESISTOR MAX5946 toc42 00 200 300 400 500 600 700 800 900 1000 KG 00 1000 11 9P6SXVIN MAX5946 Dual PCI Express Hot Plug Controller Pin Description FUNCTION Present Detect Input A PRES DETA accepts inputs from the PRSNT 2 pin on a PCI express connector PRES DETA has an internal pullup to 3 3VAUXIN When PRES DETA is low the outputs follow the command from ONA and AUXONA after a 4ms debounced time When PRES DETA goes from low to high all outputs of the respe
15. QFN MAX5946LETX 40 C to 85 C 36 Thin QFN 3 n Configuration TOP VIEW PRES DETA 1 r 27 PRES DETB FONA 2 T 26 FONB 3 1 25 ONB AUXONA 41 MAXIM 24 AUXONB 128 5 MAX5946 r 23 12SB r 22 12SB 21 1268 20 33SB 19 3 3SB 12SA 61 126A 71 3 35 8 3 3SA 8 3 3VAUXIN I 33VAUXOA 2 z 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 9P6SXVIN MAX5946 Dual PCI Express Hot Plug Controller ABSOLUTE MAXIMUM RATINGS All voltages referenced to GND unless otherwise noted T2M INA a tette e esee ca eger to teet tiens 0 3V to 14V 12GA 12GB 0 3V to V12vIN 6V 12SA 12SA 12SB 12SB 0 3V to V42VIN 0 3V 3 3VAUXIN ONA ONB FAULTA FAULTB 0 3V to 6V PWRGDA PWRGDB 0 3V to 6V POND Lc tod eeu e aces 0 3V to 0 3V All Other Pins to GND 0 3V to V3 3VAUXIN 0 3V Continuous Power Dissipation TA 70 C 36 Pin Thin QFN derate 26 3mW C above 70 C 2 105W Operating Temperature Range 40 to 85 C Junction Temperature 150 C Sto
16. RECTION 6 00 640 6 00 DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0 20 AND 0 25mm FROM TERMINAL TIP 59 75 BSC 5 75 BSC A THE PIN 1 IDENTIFIER MUST BE EXISTED ON THE TOP SURFACE OF THE 0 50 BSC 0 50 BSC PACKAGE BY USING INDENTATION MARK OR INK LASER MARKED DETAILS OF PIN 1 IDENTIFIER IS OPTIONAL BUT MUST BE LOCATED WITHIN ZONE INDICATED 0 60 i 0 40 EXACT SHAPE AND SIZE OF THIS FEATURE IS OPTIONAL ALL DIMENSIONS ARE IN MILLIMETERS PACKAGE WARPAGE MAX 0 05mm APPLIED FOR EXPOSED PAD AND TERMINALS EXCLUDE EMBEDDING PART OF EXPOSED PAD FROM MEASURING MEETS JEDEC M0220 THIS PACKAGE OUTLINE APPLIES TO ANVIL SINGULATION STEPPED SIDES LEADS TO BE COPLANAR 0 08 mm P BALLAS AVLAXL VI PROPRIETARY INFORMATION TITLE PACKAGE DUTLINE 36 40L QFN 6x6x0 90 MM APPROVAL DOCUMENT CONTROL NO 21 0105 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 23 2004 Maxim Integrated Products Printed USA MAXIM is registered trademark of Maxim Integrated Products 9P6SXVIN
17. URRENT PWRGD_ q FAULT_ PWRGD_ IS PULLED UP TO 3 3VAUXO_ FAULT_ IS PULLED UP TO 3 3VAUXIN A FAULT ON THE 3 3V OUTPUT OR 3 3VAUXO_ OUTPUT PRODUCES SIMILAR RESULTS Figure 4 12 Output Overcurrent Short Circuit During Normal Operation 12V and 3 3V Outputs Normal Operation The MAX5946 monitors and actively limits the current of the 12V and 3 3V outputs after the startup period Each output has its own overcurrent threshold If any of the monitored output currents rise above the overcurrent threshold for a period trAULT FAULT_ asserts and the 16 VipliMTH 3 RSENSE 1 i 126 12V OUTPUT CURRENT 3 3VAUXO PWRGD 3 3VAUXIN 2 X lrAULT RISING EDGE 3 FAULT _ PWRGD_ IS PULLED UP TO 3 3VAUXO FAULT_ IS PULLED UP TO 3 3VAUXIN A FAULT ON THE 3 3V OUTPUT OR 3 3VAUXO_ OUTPUT PRODUCES SIMILAR RESULTS Figure 3 12V Power Up Timing Turn On into Output Overcurrent Short Circuit controller disengages both the 12V and 3 3V outputs for the particular slot see the Fault Management section 3 3V Auxiliary Output Normal Operation The auxiliary output current is internally monitored and actively limited to the maximum current limit value An overcurrent fault condition occurs when the output current exceeds the overcurrent threshold for longer then tFAULT A fault on an auxiliary channel causes all supplies of the affected channel to be disabled after a
18. ad High Rps causes larger output ripple if there are pulsed loads High Rps can also trigger an external undervoltage fault at full load Determine the MOSFETs power rating requirement to accommo date a short circuit condition on the board during start up Table 3 lists MOSFETs and sense resistor manufacturers Additional External Gate External capacitance can be added from the gate of the external MOSFETs to GND to slow down the dV dt of the 12V and 3 3V outputs Maximum Load Capacitance Large capacitive loads at the 12V output the 3 3V out put and the 3 3V auxiliary output can cause a problem when inserting discharged PCI cards into live back planes A fault occurs if the time needed to charge the capacitance of the board is greater than the typical startup time 2 x tFAULT The MAX5946 can withstand 19 9bP6SXVIN MAX5946 Dual PCI Express Hot Plug Controller Table 3 Component Manufacturers COMPONENT MANUFACTURER PHONE WEBSITE Vishay Dale Sense Resistor Fairchild 402 564 3131 704 264 888 522 5372 www vishay com www irctt com www fairchildsemi com International Rectifier 310 322 3331 www irf com MOSFETs Motorola Vishay Siliconix large capacitive loads due to their adjustable startup times and adjustable current limit thresholds Calculate the maximum load capacitance as follows VOUT is either the 3 3V output the 12V output or the 3 3V auxiliary o
19. apacitance to quickly turn off the external MOSFET During short circuit events an internal 100mA current activates to rapidly bring the load current into the regu lation limits 3 3G_ is the gate drive for the 3 3V main supply s MOSFET and is driven to 5 5V above the 3 3V main sup ply The power for 3 3G_ is supplied from 12VIN and has no internal charge pump During turn on 3 3G sources 5pA into the external gate capacitance to con trol the turn on time of the external MOSFET During turn off 3 3G_ sinks 150pA to quickly turn off the exter nal MOSFET During short circuit events an internal 150mA current activates to rapidly turn off the appropri ate external MOSFET Auxiliary Supply 3 3VAUXIN 3 3VAUXIN provides power to the auxiliary outputs as well as the internal logic and references The drains of the internal auxiliary MOSFETs connect to 3 3VAUXIN through internal sense resistors and the sources con nect to the auxiliary outputs 3 3VAUXOA and 3 3VAUXOB Both MOSFETs have typical on resistance of 0 30 An internal charge pump boosts the gate drive voltage to fully turn on the internal n channel MOSFETs The auxiliary supplies have an internal current limit set to 470mA Applications Information Setting the Fault Timeout Period tFAULT tFAULT is the time an overcurrent or overtemperature fault must remain for the MAX5946 to disable the main or auxiliary channels of a particular slot Program the fault timeout perio
20. ault and restart the outputs If the overcurrent fault occurred on an auxiliary output or an overtemperature fault occurred bring both ON_ and AUXON low for a minimum of tRESET to reset the fault Bring ON_ and or AUXON high again to restart the respective outputs As an extra protection the MAX5946L waits a minimum of tRESTART before it can be restarted Debounced Logic Gate Input Output INPUT1 and INPUT2 accept inputs from mechanical switches The corresponding outputs are OUTPUT1 and OUTPUT2 OUTPUT is debounced for 4ms When INPUT_ goes from high to low OUTPUT goes low right away and stays low for at least 4ms After the debounce time OUTPUT follows INPUT_ If INPUT_ goes from low to high OUTPUT goes high right away and stays high for at least 4ms After the debounce time OUTPUT follows INPUT Figure 5 shows the tim ing diagram describing the INPUT OUTPUT debounced feature Present Detect and Forced On Inputs PRES DET FON PRES DETA and PRES DETB inputs detect the PRSNT 2 pin on a PCI express connector When the card is plugged in PRES DET_ goes low and allows the turn on of the outputs of the respective slot after a CT MM gt ippc p ipsc rt p ppc rtt DEBOUNCED OUTPUT Figure 5 INPUT_ and OUTPUT Debounced Feature MAKIM Controller 4ms debounced time When the card is removed an internal 50kQ pullup forces PRES
21. ctive slot shut down with no delay see Table 2 Forced On Input A FONA has a 50kQ internal pullup to 3 3VAUXIN A logic low on FONA turns on all Slot A outputs as long as the power inputs are within their operating range regardless of the status of e other input signals Leave FONA open for normal operation see Table 2 ot A 12V And 3 3V Outputs Enable A logic high at ONA turns on the 12V and 3 3V outputs of slot A see Table 2 Slot A 3 3V Auxiliary Output Enable A logic high at AUXONA turns on the slot A auxiliary output 3 3VAUXOA see Table 2 Slot A 12V Positive Current Sense Input Connect the positive terminal of the current sense resistor to 12SA using the Kelvin sensing technique to assure accurate current sensing AUXONA 12SA A 12V Negalive Current Sense Input Connect 12SA to the negative side of the current sense resistor using the Kelvin sensing technique to assure accurate current sensing ot A 12V Gate Drive Output Connect 12GA to the gate of slot A s 12V MOSFET At power up V12GA is raised to the internal charge pump voltage level by a constant current A 3 3V Positive Current Sense Input Connect the positive side of the current sense resistor to 3SA using the Kelvin sensing technique to assure accurate current sensing This input is also used he 3 3V supply s UVLO function A 3 3V Negative Current Sense Input Connect to the negative side of the sense resistor using t
22. d tFAULT by connecting a resistor from TIM to GND tFAULT can be calculated by the following equation tFAULT 166ns Q x RTIM The tFAULT programmed time duration must be chosen according to the total capacitance load connected to the 12G_ and 3 3G_ pins To properly power up the main supply outputs the following constraints need to be taken Controller VGATE X CLOAD ICHG where tsU 2 x tFAULT and where 1 IcHG SUA 2 VGATE 18 4V for 12G_ and VGATE 9 4V for 3 3G_ 3 CLOAD is the total capacitance load at the gate Maximum and minimum values for RTIM are 500Q and 500kQ respectively Leave TIM floating for a default tFAULT of 11ms tsu Setting the Power On Reset Timeout Period HL tPOR_HL is the time from when the gate voltages of all outputs of a slot reach their power good threshold to when PWRGD_ pulls low Program the power on reset timeout period tPoR by connecting a resistor RADJ from PORADJ to GND HL can be calculat ed by the following equation tPOR HL 2 5us Q x RPORADJ Maximum and minimum values for RPORADJ are 5000 and 500kQ respectively Leave PORADJ floating for a default tron of 160ms Component Selection Select the external n channel MOSFET according to the applications current requirement Limit the switch power dissipation by choosing a MOSFET with an Rps ON low enough to have a minimum voltage drop at full lo
23. div 100ms div FAULT CONDITION ON 12V OUTPUT LATCH OPTION MAX5946L MAX5946 toc21 12V OUTPUT CURRENT 5A div 128 20V div 12V OUTPUT VOLTAGE 10V div FAULT_ 5V div 100ms div 9P6SXVIN MAX5946 Dual PCI Express Hot Plug Controller Typical Operating Characteristics continued V12VIN V42SA 12V V3 3VAUXIN V3 3S_ VON_ VAUXON_ VINPUT_ 3 3V PRES D ET_ GND FON PORADJ TIM float FAULT_ 10kQ to 3 3VAUXIN PWRGDA 10kQ to 3 3VAUXO TA 25 C unless otherwise noted see the Typical Application Circuit FAULT CONDITION ON 3 3V OUTPUT MAX5946 toc22 v i V gg STEP T0 150 42V OUTPUT CURRENT 5A div 12G_ 20V div ee epee seit prend 12V OUTPUT VOLTAGE 10V div FAULT_ 5V div FAULT CONDITION ON 12V OUTPUT LATCH OPTION MAX5946L Roan STEP T0 0 50 MAX5946 toc23 3 3V OUTPUT CURRENT 2A div 3 3G_ 10V div 3 3V OUTPUT VOLTAGE 5V div FAULT_ 5V div 4ms div 100ms div FAULT CONDITION ON AUXILIARY OUTPUT FAULT CONDITION ON 3 3V MAIN OUTPUT LATCH OPTION MAX5946L MAX5946 toc24 MAX5946 toc25 i 3 3V OUTPUT CURRENT 3 3VAUXO_ OUTPUT CURRENT RLOAD 2A div 500mA div STEP T0 0 50 330 10V div 3 3V OUTPUT VOLTAGE 3 3VAUXO_ OUTPUT VOLTAGE 5V div 2V div EM FAULT_ FAULT_ 2V div 5V div 4ms div 100ms div FAULT CONDITION ON AUXILIARY OUTPUT SHORT CIRCUIT ON 12V OUTPUT MAX5946 toc26 MAX594
24. e shuts down all outputs and asserts FAULT of the respective slot Undervoltage Lockout Threshold The UVLO thresholds prevent the internal auxiliary MOSFETs and the external main channel MOSFETs Q1 Q4 in the Typical Application Circuit from turning on if V12VIN V3 3VIN and V3 3VAUXIN are not present Internal comparators monitor the main supplies and the auxiliary supply and keep the gate drive outputs 12GA 12GB 3 3GA and 3 3GB low until the supplies rise above their UVLO threshold The 12V main supply is monitored at 12VIN and has a UVLO threshold of 10V The 3 3V main supply is monitored at 3 3SA and has a UVLO threshold of 2 65V The auxiliary supply is monitored at 3 3VAUXIN and has a 2 65V UVLO thresh old For either main channel to operate V3 3VAUXIN must be above its UVLO threshold 17 9P6SXVIN Dual PCI Express Hot Plug Controller SHUT DOWN 12V AND 3 3V OUTPUTS ASSERT FAULT STAY WAITING FOR HAS FAULT ELAPSED START COUNTING FAULT WAS CURRENT LIMIT DETECTED ON ANY 12V OR 3 3V OUTPUT 12V AND 3 3V OUTPUTS ARE ENABLED MAX5946 IRESTART ISFAULI STILL PRESENT RESET teauyit COUNTER LATCH OFF OPTION RESET FAULT AND RESTART 12V 3 3V SUPPLIES STAY WAITING FOR ON_ TRANSITION HIGH gt LOW gt HIGH ENABLE CHARGE ON 1G AND 3 36_ HAS tsu PINS START ELAPSED
25. he elvin sensing technique to assure accurate current sensing ot A 3 3V Gate Drive Output Connect 3 3GA to the gate of slot A s 3 3V MOSFET At power up V3 3GA is charged to 5 5V above the 3 3V supply by a constant current derived from V42yIN Open Drain Fault Output Signal FAULTA latches active low whenever the slot A outputs are shut down due to a fault A fault is either of An overcurrent condition lasting longer than the overcurrent timeout FAULTA A device over temperature condition If the fault is detected in the main outputs FAULTA must be reset by toggling the ONA input If the fault is in the auxiliary output FAULTA must be reset by toggling both ONA and AUXONA For the auto restart version FAULTA is reset when the part initiates the next power on cycle Open Drain Power Good Output PWRGDA goes low tpor_HL after all outputs of slot A reach their final value and the power MOSFETS are fully enhanced 3 3VAUXOA Slot A 3 3V Auxiliary Power Supply Output PWRGDA 3 3V Auxiliary Supply Input 3 3VAUXIN is the input to a charge pump that drives the internal MOSFETs 3 3VAUXIN connecting 3 3VAUXIN to 3 3VAUXOA and 3 3VAUXOB V3 3VAUXIN is also used to power the internal control logic and analog references of the MAX5946 3 3VAUXOB Slot B 3 3V Auxiliary Power Output PWRGDB B Power Good Output See PWRGDA function FAULTB B Open Drain Fault Output See FAULTA function 3 3GB B 3 3V Gate Drive Output
26. ition persists for longer than a programmable overcurrent timeout Thermal protection circuitry also shuts down all outputs if the die temperature exceeds 150 C After an overcurrent or overtemperature fault condition the MAX5946L latches off while the MAX5946A automatical ly restarts after a restart time delay The device is avail able in a 36 pin 6mm x 6mm thin QFN package and operates over the 40 C to 85 C temperature range Applications Servers Desktop Mobile Server Platforms Workstations Embedded Devices Typical Application Circuit appears at end of data sheet SMBus is a trademark of Intel Corp PCI Express is a trademark of PCI SIG Corp MAXIM ZX LAM Dual PCI Express Hot Plug Controller Features PCI Express Compliant Hot Swaps 12V 3 3V and 3 3V Auxiliary for 2 PCI E Slots Integrated Power MOSFET for Auxiliary Supply Rails Controls dl dt and dV dt Active Current Limiting Protects Against Overcurrent Short Circuit Conditions Programmable Current Limit Timeout PWRGD Signal Outputs with Programmable Power On Reset POR 160ms Default Latched FAULT Signal Output after Overcurrent or Overtemperature Fault Attention Switch Inputs Outputs with 4ms Debounce Present Detect Inputs Forced On Inputs Facilitates Testing Thermal Shutdown Allows Control through SMBus with an I O Expander Ordering Information PART TEMP RANGE PIN PACKAGE MAX5946AETX 40 C to 85 C 36 Thin
27. ly after all the following events have occurred e V3 3VAUXIN is above its UVLO threshold e V12VIN and V3 3SA are both above their UVLO threshold ON is driven high e PRES DET_ is low for more than 4ms The auxiliary supply output is made available only after the following events have occurred e Va33VAUXIN is above its UVLO threshold e AUXON is driven high e PRES DET_ is low for more than 4ms MAKIM The FON_ input overrides all other control signals and turns on the respective slot when driven low as long as the UVLO thresholds have been reached Table 2 sum marizes the logic conditions required for startup The auxiliary supply input powers the internal control logic and analog references of the MAX5946 so the main supplies cannot be enabled if V3 3VAUXIN is not present When an output is enabled a programmable startup timer tsU begins to count the startup time duration The value of tsu is set to 2x the fault timeout period tFAULT externally connected from to GND sets the duration of tFAULT 15 9P6SXVIN MAX5946 Dual PCI Express Hot Plug Controller ON_ AUXON VPGTH12 VPGTH3 3 a 12G_ 3 3G_ 12V0_ 3 3V0_ 3 3VAUXO wa i PWRGD_ 3 3AUXIN i RISING FAULT EDGE PWRGD_ IS PULLED UP TO 3 3 FAULT_ IS PULLED UP TO 3 3AUXIN Figure 2 Power Up Timing No Fault 12G_ Vi2lLIM TH RSENSE 12V OUTPUT C
28. me tRESTART 64 X tFAULT Fault Reset Minimum Pulse Width Note 4 tRESET 100 Thermal Shutdown Threshold Tsp TJ rising 1150 Thermal Shutdown Threshold Hysteresis OUTPUT Debounce Time OUTPUT High Voltage Sourcing 2mA Note 1 100 production tested at TA 25 C Parameters over temperature are guaranteed by design Note 2 PWRGD asserts a time tpPon Hi after VPGTH12 VPGTH3 3 and VPGTH3 3AUX Conditions are met Note 3 The UVLO for the 3 3V supply is sensed at 3 3SA Note 4 This is the time that ON_ or AUXON must stay low when resetting a fault condition AVLAZXL VI Dual PCI Express Hot Plug Controller Typical Operating Characteristics V42VIN V42SA 12V V3 3VAUXIN V3 3S_ VON VAUXON_ VINPUT_ 8 3V PRES DET_ GND FON_ PORADJ TIM float FAULT_ 10kQ to 3 3VAUXIN PWRGDA 10kQ to 3 3VAUXO TA 25 unless otherwise noted see the Typical Application Circuit 12VIN INPUT SUPPLY CURRENT 3 3VAUXIN SUPPLY CURRENT ON AND AUXON LOW TO HIGH THRESHOLD vs TEMPERATURE vs TEMPERATURE VOLTAGE vs TEMP
29. ms div MAXIM Dual PCI Express Hot Plug Controller Typical Operating Characteristics continued V42VIN V42SA 12V V3 3VAUXIN V3 3S_ VON VAUXON_ VINPUT_ 3 3V PRES DET_ GND FON_ PORADJ TIM float FAULT_ 10kO to 3 3VAUXIN PWRGDA 10kQ to 3 3VAUXO_ Ta 25 unless otherwise noted see the Typical Application Circuit 3 3V INPUT 3 3V AUXILIARY INPUT POWER UP MAX5946 toc16 3 3G_ 10V div 3 3V OUTPUT 5V div 338 5V div 3 3VAUXO_ 5V div NR PWRGD 5V div 100ms div FAULT CONDITION ON 12V OUTPUT AUTORESTART OPTION MAX5946A MAX5946 toc18 i DE Rioap STEP TO 1 50 12V OUTPUT CURRENT 5A div 126 20V div 12V OUTPUT VOLTAGE 10V div FAULT_ 5V div 100ms div FAULT CONDITION ON AUXILIARY OUTPUT AUTORESTART OPTION MAX5946A MAX5946 toc20 pp STEP T040 500mA div f 2 i id 2V div IRESTART 3M FAULT 2V div 100ms div 3 3VAUXO_ OUTPUT CURRENT 3 3VAUXO_ OUTPUT VOLTAGE TURN ON DELAY 3 3V OUTPUT AND 3 3V AUXILIARY OUTPUT MAX5946 toc17 3 3VAUX0_ 5V div OUTPUT VOLTAGE 4 3 3 INPUT 3 3VAUXIN 5V div 5V div 3 3 OUTPUT VOLTAGE 5V div PWRGD 10V div 3 3G_ 4ms div FAULT CONDITION ON 3 3V OUTPUT AUTORESTART OPTION MAX5946A MAX5946 toc19 detis Ruoan STEP 050 3 3V MAIN OUTPUT CURRENT 2A div 3 3G_ 10V div 3 3V OUTPUT VOLTAGE 5V div FAULT_ 5V
30. rage Temperature Range 65 C to 150 C Lead Temperature soldering 105 300 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 ELECTRICAL CHARACTERISTICS reliability V12VIN V428 Vi28 4 12V V3 3S_ V3 3S_ V3 3VAUXIN VON_ VAUXON_ VFON__ 8 3V PWRGD_ FAULT_ PORADJ TIM OUTPUT 12G 3 3G_ OPEN INPUT_ PRES_D Typical values are at TA 25 Note 1 PARAMETER SYMBOL ET_ PGND GND TA 40 C to 85 C unless otherwise noted CONDITIONS 12V SUPPLY 12V Supply Voltage Range V42VIN Viavin rising 4 2VIN Undervoltage Lockout V42UVLO Hysteresis 12VIN Supply Current 142VIN V42VIN 13 2V 12VIN CONTROL 12VIN Current Limit T V hreshold V12s V12s 12ILIM 12G_ Gate Charge Current lh2G_cHG V12G_ GND Normal turn off ON_ GND V12G_ 2V 4 12G_ Gate High Voltage 9 9 V12G H l2G_ 1 2G Gate Discharge Current H2G DIS Output short circuit condition strong gate pulldown to regulation V1ovIN V1i28 2 1V 5V V12G_ V42VI
31. upply inrush current The MAX5946 actively imits the current of all outputs at all times and shuts down if an overcurrent condition persists for longer than a programmable overcurrent timeout Thermal protection circuitry also shuts down all outputs if the die temperature exceeds 150 C After an overcurrent or overtemperature fault condition the MAX5946L latches off while the MAX5946A automatically restarts after a restart time delay The power requirement for PCI express connectors is defined by the PCI express card specification and summarized in Table 1 13 9bP6SXVIN MAX5946 Dual PCI Express Hot Plug Controller RPoRADJ INPUT1 INPUT2 12VIN OUTPUT2 PWRGDA FAULTA PORADJ PWRGDB FAULTB T RSENSE12A RSENSE128 CHARGE CHARGE PUMP PUMP A FAULT OSCILLATOR DEBOUNCE tPOR FAST OSCILLATOR OSCILLATOR MAXIM MAX5946 g 3SA 3 388 TN RSENSE33A E _ RSENSE3 3B BIAS ERENCES AND UVLO Y Y Y Y CONTROL LOGIC CONTROL LOGIC MAIN SLOT A MAIN SLOT B 3 3VAUXIN
32. urrent 3 3VAUXIN to 3 3VAUXO_ Maximum Dropout V3 3VAUXIN 7 3 6V 13 3VAUXO_ 375mA 3 3VAUXO Current Limit Threshold 3 3VAUXO_ shorted to GND 3 3VAUXO_ Threshold For PWRGD_ Assertion V3 3VAUXIN V3 3VAUXO Note 3 VPGTH3 3AUX LOGIC SIGNALS nput Logic Threshold ON_ FON_ AUXON_ PRES DET_ INPUT_ Rising edge Hysteresis nput Bias Current ON_ AUXON_ INPUT_ FON_ PRES DET_ Internal Pullup ON_ AUXON_ High to Low Deglitch Time MAXUM 9bP6SXVIN MAX5946 Dual PCI Express Hot Plug Controller ELECTRICAL CHARACTERISTICS continued V42VIN V428 V42S_ 12V V3 33S_ V3 3S_ V3 3VAUXIN VON_ VAUXON_ VFON__ 8 3V PWRGD_ FAULT_ PORADJ TIM OUTPUT_ 12G_ 3 3G_ OPEN INPUT_ PRES_DET_ PGND GND TA 40 to 85 C unless otherwise noted Typical values are at TA 25 C Note 1 PARAMETER SYMBOL CONDITIONS PRES DET_ High to Low Deglitch Time tDEG PORADJ open PWRGD Power On Reset Bot RPORADJ 20kQ Time Note 2 RPORADJ 100kQ RPORADJ 200 PWRGD_ Low to High Deglitch Time PWRGD_ FAULT_ Output Low Voltage PWRGD_ FAULT_ Output High kage Current tPOR_LH open 5 5 11 15kQ 1 4 2 6 3 8 120kQ 12 22 32 300kQ 59 imeout tFAULT FAULT_ Timeout During Startup tsu 2 X tFAULT Autorestart Delay Ti
33. utput for slot A or slot B Input Transients The 12V input 12VIN the 3 3V input 3 3SA and the 3 3V auxiliary 3 3VAUXIN must be above their UVLO 20 602 244 3576 www mot sps com ppd www vishay com thresholds before startup can occur Input transients can cause the input voltage to sag below the UVLO threshold The MAX5496 rejects transients on the input supplies that are shorter than 4us typical _ Information TRANSISTOR COUNT 10 487 PROCESS BiCMOS MAALM PCI EXPRESS SLOTA PRSNT1 VioviN Q1 SI7448DP T1 Dual PCI Express Hot Plug Controller V33AUXIN Typical Application Circuit 03 SI7448DP T1 PCI EXPRI SLOT ESS 12V 3 3VAUX 02 SI7448DP T1 PWRGDA AAA R2 3 3VAUXOA GND PRES DETA FAULTA FAULTB W FONA FONB gt R2 3 3VAUXIN MAXIM MAX5946 gt AUXONA AUXONB OUTPUT1 OUTPUT2 gt ONB INPUT1 INPUT2 PRES DETB PWRGDB 3 3VAUXOB PORADJ ADD IN PRSNT1 12V 3 3VAUX 04 5174480 1 PRSNT2 MAKIM AA V33AUXIN T 10kQ ATTENTION SWITCHES MAX7313ATG 16 BIT 1 0 EXPANDER 0 3 3V INPUT 0 1 pF A0 2
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