EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX5954 Single PCI Express, Hot-Plug Controller General Description Features The MAX5954 hot-plug controller is designed for PCI PCI Express Compliant Express applications. The device provides hot-plug Hot Swaps 12V, 3.3V, and 3.3V Auxiliary for a Single control for 12V, 3.3V, and 3.3V auxiliary supplies of a PCI-E Slot single PCI Express (PCI-E) slot. The MAX5954s logic Integrated Power MOSFET for Auxiliary Supply Rail inputs/outputs allow interfacing directly with the system Controls dI/dt and dV/dt hot-plug management controller or through an SMBus Active Current Limiting Protects Against Overcurrent/ with an external I/O expander. Integrated debounced Short-Circuit Conditions attention switch and present-detect signals are included Programmable Current-Limit Timeout to simplify system design. PWRGD Signal Output with Programmable Power- The MAX5954 drives two external n-channel MOSFETs to On Reset (POR) (160ms Default) control the 12V and 3.3V main outputs. The 3.3V auxiliary Latched FAULT Signal Output after Overcurrent or output is controlled through an internal 0.3 n-channel Overtemperature Fault MOSFET. An internal charge pump provides gate drive for Attention Switch Input/Output with 4.4ms Debounce the 12V output while the gate drive of the 3.3V output is Present-Detect Input driven by the 12V input supply. The 3.3V auxiliary output Forced-On Input Facilitates Testing is completely independent from the main outputs with its Thermal Shutdown own charge pump. Allows Control Through SMBus with an I/O Expander At power-up, the MAX5954 keeps all of the external Applications MOSFETs off until the supplies rise above their respec- Servers tive undervoltage-lockout (UVLO) thresholds. The device Desktop Mobile Server Platforms keeps the internal MOSFET off only until the auxiliary Workstations input supply rises above its UVLO threshold. Upon a turn- Embedded Devices on command, the MAX5954 enhances the external and internal MOSFETs slowly with a constant gate current Pin Configuration to limit the power-supply inrush current. The MAX5954 actively limits the current of all outputs at all times and TOP VIEW shuts down if an overcurrent condition persists for longer than a programmable overcurrent timeout. Thermal- 27 26 25 24 23 22 21 20 19 protection circuitry also shuts down all outputs if the die 28 18 temperature exceeds +150C. After an overcurrent or TIM N.C. N.C. 29 17 N.C. overtemperature fault condition, the MAX5954L latches 30 N.C. 16 N.C. off while the MAX5954A automatically restarts after a OUTPUT 31 15 N.C. restart time delay. The device is available in a 36-pin INPUT 32 MAX5954 14 3.3VAUXIN (6mm 6mm) thin QFN package and operates over the 12VIN 33 13 3.3VAUXO -40C to +85C temperature range. GND 34 12 PWRGD PGND 35 11 FAULT Ordering Information appears at end of data sheet. PORADJ 36 10 3.3G + 1 2 3 4 5 6 7 8 9 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. THIN QFN 19-3914 Rev 2 7/19 PRES-DET N.C. FON N.C. ON T2 AUXON T1 12S+ N.C. 12S- N.C. 12G N.C. 3.3S+ N.C. 3.3S- N.C.MAX5954 Single PCI Express, Hot-Plug Controller Absolute Maximum Ratings (All voltages referenced to GND, unless otherwise noted.) Continuous Power Dissipation (T = +70C) A 12VIN.....................................................................-0.3V to +14V 36-Pin Thin QFN (derate 26.3mW/C above +70C) ..2.105W 12G ..........................................................-0.3V to (V + 6V) Operating Temperature Range ........................... -40C to +85C 12VIN 12S, 12S-, 3.3G....................................-0.3V to (V + 0.3V) Junction Temperature ......................................................+150C 12VIN 3.3VAUXIN, ON, FAULT ..........................................-0.3V to +6V Storage Temperature Range ............................ -65C to +150C PWRGD ...................................................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C PGND ...................................................................-0.3V to +0.3V All Other Pins to GND ...................-0.3V to (V + 0.3V) 3.3VAUXIN 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 = V = V = 12V, V = V = V = V = V = V = 3.3V, PWRGD = FAULT = PORADJ = 12VIN 12S- 12S+ 3.3S+ 3.3S- 3.3VAUXIN ON AUXON FON TIM = OUTPUT = 12G = 3.3G = OPEN, INPUT = PRES-DET = PGND = GND, T = -40C to +85C, unless otherwise noted. Typical A values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 12V SUPPLY 12V Supply Voltage Range V 10.8 12 13.2 V 12VIN V rising 9.5 10 10.5 12VIN Undervoltage 12VIN V V 12UVLO Lockout Hysteresis 0.1 12VIN Supply Current I V = 13.2V 0.5 1 mA 12VIN 12VIN 12VIN CONTROL 12VIN Current-Limit V 49 54 59 mV 12ILIM Threshold (V - V ) 12S+ 12S- 12G Gate Charge Current I V = GND 4 5 6 A 12G CHG 12G Normal turn-off, ON = GND, V = 2V 50 150 250 A 12G 12G Gate Discharge Output short-circuit condition, strong gate I 12G DIS Current pulldown to regulation, V - V 1V, 50 120 180 mA 12VIN 12S V = 5V 12G 12G Gate High Voltage V I = 1A 4.8 5.3 5.8 V 12GH 12G (V - V ) 12G 12VIN 12G Threshold Voltage For V Referred to V , I = 1A (Note 2) 3.0 4 4.8 V PGTH12 12VIN 12G PWRGD Assertion 12S- Input Bias Current 1 A 12S+ Input Bias Current 20 60 A 3.3V SUPPLY 3.3V Supply Voltage Range V 3.0 3.3 3.6 V 3.3S+ 3.3S+ rising 2.52 2.65 2.78 V Undervoltage Lockout (Note 3) Hysteresis 30 mV Maxim Integrated 2 www.maximintegrated.com