MIC2593 Micrel Semiconductor, MIC2593 Datasheet
MIC2593
Available stocks
Related parts for MIC2593
MIC2593 Summary of contents
Page 1
... MIC2593 General Description The MIC2593 is a power controller supporting power distribu- tion requirements for Peripheral Component Interconnect hot plug systems compliant to PCI v2.3 and PCI-X 1.0b. The MIC2593 provides complete power control support for two PCI slots, including the 3.3V defined by the PCI v2.3 AUX specification. Support for +5V, +3.3V, +12V, and – ...
Page 2
... VAUXA VSTBYA 11 5VINA 26 VSTBYB 5VSENSEA 5VGATEA 3 12VSLEWA 34 12VSLEWB 5VOUTA 3VINA 2 CFILTERA 35 CFILTERB 3VSENSEA 3VGATEA 3VOUTA 4 GPIA MIC2593 12VOUTA 12MVOUTA 38 GPIB 5VINB 5VSENSEB 4 45 AUXENA 42 AUXENB 5VGATEB 44 ONA 43 ONB 5VOUTB 2 3VINB 1 /FAULTA 3VSENSEB 36 /FAULTB 3VGATEB 41 A0 3VOUTB ...
Page 3
... MIC2593 Pin Configuration /FAULTA CFILTERA 12VSLEWA GPIA 12VINA 5VINA 5VSENSEA 5VGATEA 5VOUTA 12VOUTA VSTBYA 3VINA Slot A Interface April 2004 Hot Plug Control Interface ...
Page 4
... MOSFET switch for +12V Slot A. Pin 32 is the input to the drain side of the internal MOSFET switch for +12V Slot B. These two pins must ultimately connect to each other within the MIC2593. An undervoltage lockout circuit (UVLO) prevents the switches from turning on while this input is less than its lockout threshold ...
Page 5
... Standby Input Voltage: Required to support PCI VAUX output. Additionally, the SMBus logic and internal registers run off of VSTBY[A/B] to ensure that the MIC2593 is accessible during standby modes. A UVLO circuit prevents turn-on of this supply until VSTBY[A/B] rises above its UVLO threshold. Both pins must be connected together externally at the IC. ...
Page 6
... MIC2593 Pin Description (cont) Pin Number Pin Name 4 GPIA 38 GPIB SDA 47 SCL 37 /INT 33 GND 46 M9999-042204 Pin Function General Purpose Inputs: The states of these two inputs are available by reading the Common Status Register, Bits [4:5]. If not used, connect each pin to GND. A1 SMBus Address Select Pins: Connect to ground or leave open in order to A0 program device SMBus base address ...
Page 7
... MIC2593 Absolute Maximum Ratings Supply Voltage 12VIN ...................................................................... +14V 12MVIN ................................................................... –14V 5VIN .......................................................................... +7V 3VIN, VSTBY ............................................................ +7V Any Logic Pin ............................................ –0.5V to 3.6V Output Current (/FAULT[A/B], /INT, SDA) .................. 10mA Lead Temperature IR Reflow, Peak Temperature ................... 240 0 C/–5 C Storage Temperature ............................... – +150 C (3) ESD Rating Human Body Model ................................................... 2kV Machine Model ...
Page 8
... I = 100mA 125 375mA 125 12V [A/B] = Off 125 C OUT J 12MV [A/B] = Off 125 C OUT J V [A/B] = Off 125 C AUX J 12V [A/ OUT 12MV [A/ OUT MIC2593-2BTQ 12V [A/B] OUT 12MV [A/B] OUT 8 Micrel Min Typ Max Units 113 135 mV Disabled 0.5 A 0.5 A 0.8 V ...
Page 9
... AUX Figure 5 t 12V Current Limit Response, OFF(12V) Figure 3 t –12V Current Limit Response, OFF(12MV) Figure 3 t Delay from 3V[A/B] Overcurrent Limit MIC2593-2 PROP(3VFAULT) to FAULT Output t Delay from 5V[A/B] Overcurrent Limit MIC2593-2 PROP(5VFAULT) to FAULT Output t ON[A/B], AUXEN[A/B] Pulse Width W t MIC2593 Power-On Reset Time ...
Page 10
... MIC2593 Timing Diagrams SCL SDA Data In SDA Data Out V THFAST V THLIMIT 12VGATE t OFF12 Figure 2. 12V Current Limit Response Timing Must Trip I AUX(THRESH) May Not Trip I I OUT(AUX) OUT(AUX) 0 Amps Figure 4. V Current Limit Threshold AUX M9999-042204 Figure 1. SMBus Timing 6V Figure 3 ...
Page 11
... SMI, or can employ the HPl for power control while continuing to use the SMI for access to all but the power control registers. In addition to the basic power control features of the MIC2593 accessible by the HPI, the SMI also gives the host access to the following information from the part: • ...
Page 12
... VSTBY[A/B] is present. Prior to entering standby mode, ONA and ONB (or the MAINA and MAINB bits in the Control Registers) inputs should be de-asserted. If this is not done, the MIC2593 will assert /FAULT and also /INT if interrupts are enabled, when the MIC2593 detects an under- voltage condition on a supply input. ...
Page 13
... MAIN and AUX supplies. General Purpose Input (GPI) Pins Two pins on the MIC2593 are available for use as GPI pins. The logic state of each of these pins can be determined by polling Bits [4:5] of Common Status Register. Both of these ...
Page 14
... Hot Plug Interface can be utilized for power control by enabling the control input pins (AUXEN[A/B] and ON[A/B]) for each slot. In order for the MIC2593 to switch on the VAUX supply for either slot, the AUXEN[A/B] control must be enabled after the power-on-reset delay, t 500 s), has elapsed ...
Page 15
... MIC2593 dure may be used. To perform a Receive_Byte operation, the host sends an address byte to select the slave MIC2593, with the R/W bit set to the high (read) state, and then retrieves the data byte. Figures 9 through 11 show the formats for these data read and data write procedures. ...
Page 16
... MIC2593 Detailed Register Descriptions Control Register, Slot A (CNTRLA) 8-Bits, Read/Write D[7] D[6] read-only read-only read only AUXAPG MAINAPG Reserved Bit(s) AUXAPG AUX output power-good status, Slot A MAINAPG MAIN output power-good status, Slot A D[5] Reserved D[4] Reserved D[3] Reserved D[2] Reserved MAINA MAIN enable control, Slot A VAUXA VAUX enable control, Slot A ...
Page 17
... MIC2593 Control Register, Slot B (CNTRLB) 8-Bits, Read/Write D[7] D[6] read-only read-only read only AUXBPG MAINBPG Reserved Bit(s) AUXBPG AUX output power-good status, Slot B MAINBPG MAIN output power-good status, Slot B D[5] Reserved D[4] Reserved D[3] Reserved D[3] Reserved MAINB MAIN enable control, Slot B VAUXB VAUX enable control, Slot B ...
Page 18
... If an overcurrent has occurred on both a MAIN output and the VAUX output of slot A, both ONA and AUXENA of the slot must go low to reset FAULTA. 2. Neither the FAULTA bit nor the /FAULTA pin is active when the MIC2593 power paths are controlled by the System Management Interface. When using SMI power path control, AUXENA and ONA pins for that slot must be tied to GND. M9999-042204 ...
Page 19
... If an overcurrent has occurred on both a MAIN output and the VAUX output of slot B, both ONB and AUXENB of the slot must go low to reset FAULTB. 2. Neither the FAULTB bit nor the /FAULTB pin is active when the MIC2593 power paths are controlled by the System Management Interface. When using SMI power path control, the AUXENB and ONB pins for that slot must be tied to GND. April 2004 ...
Page 20
... Always read as zero State of GPIB pin State of GPIA pin 0 = /INT generation is enabled /INT generation is disabled. The MIC2593 does not participate in the SMBus Alert Response Address (ARA) protocol UVLO fault 1 = UVLO fault Set whenever a circuit breaker fault condition occurs as a result of an undervoltage lockout condition on one of the main supply inputs ...
Page 21
... A 1W sense resistor would work well in this application. April 2004 Kelvin Sensing Because of the low values of the sense resistors, special attention to the layout must be used in order for the MIC2593's circuit breaker function to operate properly. Specifically, the use of a 4-wire Kelvin connection to measure the voltage across R ...
Page 22
... In MIC2593 applications, the gates of the external MOSFETs are driven from the +12V input to the MIC2593 controller. That supply may well be at 12V + (5% x 12V) = 12.6V. At the same time, if the output of the MOSFET (its source) is suddenly shorted to ground, the gate-source voltage will go to (12.6V – ...
Page 23
... MIC2593 50ms before the MIC2593 circuit breaker trips. During that time, the dissipation in the MOSFET is given by [5V–5A(0 MOSFET P = (2V 5A) = 10W for 50ms MOSFET At first glance, it would appear that a really hefty MOSFET is required to withstand this sort of fault condition. This is where the transient thermal impedance curves become very useful ...
Page 24
... Type 2743019447 Figure 14. Filter Circuit for Noisy Supplies It is theoretically possible that high-amplitude, HF noise reflected back into one or both of the MIC2593’s –12V outputs could interfere with proper device operation, although such noisy loads are unlikely to occur in the real world. If this ...
Page 25
... GATE respective power output (e.g., 5VOUTB). These capacitors, which are typically in the 10nF range, cause the GATE outputs of the MIC2593 to have very low AC impedances to ground at any significant frequency therefore necessary to place a modest value of gate damping resistance (R between each C ...
Page 26
... MIC2593 Package Information MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...