MIC2591B MICREL [Micrel Semiconductor], MIC2591B Datasheet
MIC2591B
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MIC2591B Summary of contents
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... General Description The MIC2591B is a dual-slot power controller supporting the power distribution requirements for Peripheral Component Interconnect Express (PCI Express) Hot-Plug compliant systems incorporating the Intelligent Platform Management Interface (IPMI) Specifi cation v1.0. The MIC2591B provides complete power control support for two PCI Express slots, including the 3.3VAUX defi ...
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... the external MOSFETs. # These components are not required for MIC2591B operation but can be implemented for GATE output slew rate control (application specific) ¥ Bold lines indicate high current paths PCI Express Connector PCI ...
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Pin Confi guration /FAULTA CFILTERA 12VGATEA GPI_A0 12VINA /PWRGDA 12VSENSEA /FORCE_ONA 12VOUTA VSTBYA 3VINA Slot A Interface March 2005 Hot-Plug Control Interface ...
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... Slot B. These two pins must ultimately connect to each other as close as possible at the MIC2591B controller in order to eliminate any IR drop between these pins. An undervoltage lockout circuit (UVLO) prevents the switches from turning on while this input is less than its lockout threshold. ...
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... Standby Input Voltage: Required to support PCI Express VAUX 3.3V Standby Input Voltage: Required to support PCI Express VAUX output(s). These inputs are the primary supply for the MIC2591B and must output(s). These inputs are the primary supply for the MIC2591B and must be applied at all times for the controller to function properly. ...
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Pin Description (continued) Pin Number Pin Number Pin Number Pin Number Pin Name Pin Name Pin Name Pin Name GPI_A0 GPI_A0 GPI_A0 GPI_A0 GPI_B0 GPI_B0 GPI_B0 GPI_B0 ...
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Absolute Maximum Ratings Supply Voltages 12VIN[A/B] ............................................................... 14V 3VIN[A/B], VSTBY[A/B] ............................................... 7V Any Logic Pin ......................... –0.5V (min) to 3.6V (max) Output Current (/FAULT[A/B], /INT, SDA) ................... 10mA Power Dissipation ..................................... Internally Limited Lead Temperature (Soldering) Standard Package (-xBTQ) (IR ...
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... Typ Typ Typ Typ Typ Typ Typ THILIMIT THILIMIT THILIMIT 4 MIC2591B-2BTQ MIC2591B-2BTQ 90 100 100 MIC2591B-3BTQ MIC2591B-3BTQ 135 150 150 MIC2591B-5BTQ MIC2591B-5BTQ MIC2591B-5BTQ MIC2591B-5BTQ MIC2591B-5BTQ MIC2591B-5BTQ MIC2591B-5BTQ Disabled Disabled Disabled Disabled Disabled Disabled Disabled 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 –0.5 2 ...
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... Delay from VAUX[A/B] Overcurrent PROP(VAUXFAULT) PROP(VAUXFAULT) PROP(VAUXFAULT) t ON[A/B], AUXEN[A/B] Pulse Width ON[A/B], AUXEN[A/B] Pulse Width W t MIC2591B Power-On Reset Time MIC2591B Power-On Reset Time POR after VSTBY[A/B] becomes valid after VSTBY[A/B] becomes valid SMBus Timing t SCL (clock) period SCL (clock) period SCL (clock) period 1 ...
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Electrical Characteristics (continued) Electrical Characteristics (continued) Electrical Characteristics (continued) Symbol Symbol Symbol Symbol Symbol Symbol Symbol Parameter Parameter Parameter Parameter Parameter Parameter Parameter 8-Bit Analog to Digital Converter Max_Error Max_Error Total unadjusted error for: Total unadjusted error for: Voltage, All ...
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Timing Diagrams Data In Data Out V – SENSE V THFAST V THILIMIT 12VGATE 0V t OFF(12V) Figure 2. 12V Current Limit Response Timing Must Trip I AUX(THRESH) May Not Trip OUT(AUX) OUT(AUX) 0 Figure ...
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... CFILTER Threshold vs. Temperature 1.30 1.29 1.28 1.27 1.26 1.25 1.24 1.23 1.22 1.21 1.20 1.20 1. TEMPERATURE (°C) Current Limit (Fast Threshold) vs. Temperature MIC2591B-2BTQ 120 115 110 105 12V 100 TEMPERATURE (° GATE vs. Temperature 12 ...
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... R5 C 15Ω 3VGATE 22nF 0.1µF 3VINA 3VSENSEA 3VGATEA 12VINA 12VSENSEA VSTBYA AUXENA MIC2591B ONA /FAULTA CFILTERA GND (Additional pins omitted for clarity - Slot A shown only) MIC2591B Test Circuit 13 V On-Resistance AUX (R ) vs. Temperature DS(ON) 400 350 300 250 200 150 100 ...
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Functional Characteristics Turn-On Response Slot A TIME (2.5ms/div.) 3V Overcurrent Fault Response R = 0.4Ω LOAD Slot A TIME (5ms/div.) Auxiliary Overcurrent Fault Response R = 3.3Ω LOAD Overcurrent on Slot B TIME (5ms/div.) March 2005 GATE Output Turn-On Response ...
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Functional Characteristics (cont.) 3V Undervoltage Fault Response +3VIN /FAULT +12VIN VSTBY MAIN(12V and 3.3V) Supplies ENABLED Slot A TIME (500µs/div.) 3V Ouput Discharge Response V UV(3V) TIME (25ms/div.) March 2005 V UVLO(3V) Output disabled by ON pin C = 1000µF ...
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... ON/OFF 100mV* ON/OFF 100mV* Overcurrent Detection V STBY(REF) I REF Current Mirror CFILTER[A/B] RFILTER[A&B] /FORCE_ON[A/B] GND GPI_[A0/B0] * MIC2591B-3BTQ fast threshold is 150mV MIC2591B-5BTQ fast threshold is disabled Contact factory for availabilty March 2005 ON[A/B] AUX[A/B] Power-on VSTBY Reset UVLO 250s Bandgap Reference V REF 12V ...
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... Suffi cient input bulk capacitance should be used to prevent the supply from "drooping", causing VSTBY[A/B] to fall below the UVLO threshold. Also, decoupling capacitors should be placed at each of the MIC2591B inputs in order to fi lter high frequency noise transients. V STBY ...
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... Table 1. 3.3V and 12V Output Slew-Rate Selection for Power-Down Cycle ] until the associated When one or more PCI slots are disabled via the MIC2591B output control pins, ON[A/B] or AUXEN[A/B], the output volt- age for each supply will discharge as a function of the RC time constant produced by the controller’s internal resistance ...
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... VSTBY[A/B] is present. Prior to standby mode, ONA and ONB (or the Control Registers' MAINA and MAINB bits) inputs should be deasserted or the MIC2591B will assert /FAULT[A/B] and /INT (if inter- rupts are enabled) output signals undervoltage condi- tion on the MAIN supply inputs is detected. ...
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... Once the input supplies are above their respective UVLO thresholds, the 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 MIC2591B to switch on the VAUX supply for either slot, the AUXEN[A/B] control must be enabled after the power-on-reset delay, t cally, 250µ ...
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... VAUX[A/B] outputs. To inhibit /FORCE_ON[A/B] operation, a Logical “1” shall be written to the CNTRL[A/B] Register Bit D[2] location(s). HPI-only Control Applications In applications where the MIC2591B is controlled only by the HPI, SMBus signals SCL, SDA, and /INT signals are con- nected shown in Figure 6. In this confi guration, as shown in Figure 6. In this confi ...
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... A new “Start” bit must then be sent to the MIC2591B, followed by a repeat of the device address with the R/W bit set to the high (read) state. The data to be read from the part may then be clocked out ...
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... MIC2591B Register Set and Programmer’s Model Target Register Target Register Target Register Label Label Label Label Label Description Description Description Description Description RESULT RESULT RESULT ADC Conversion Result Register ADC Conversion Result Register ADC Conversion Result Register ADC_CNTRL ADC_CNTRL ADC_CNTRL ...
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Detailed Register Descriptions Converter Result Register (RESULT) 8-Bits, Read-Only D[7] D[7] D[7] D[7] D[7] D[7] D[7] D[7] D[6] D[6] D[6] D[6] D[6] D[6] D[6] D[6] read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only ...
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Control Register, Slot A (CNTRLA) 8-Bits, Read/Write D[7] D[7] D[7] D[7] D[7] D[7] D[7] D[7] D[6] D[6] D[6] D[6] D[6] D[6] D[6] D[6] read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only ...
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Control Register, Slot B (CNTRLB) 8-Bits, Read/Write D[7] D[7] D[7] D[7] D[7] D[7] D[7] D[7] D[6] D[6] D[6] D[6] D[6] D[6] D[6] D[6] read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only read-only ...
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... 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 bits nor the /FAULTA pins are active when the MIC2591B 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. 3. ...
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... 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 bits nor the /FAULTB pins are active when the MIC2591B 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. 3:. ...
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... The 1 = /INT generation is disabled. The 1 = /INT generation is disabled. The 1 = /INT generation is disabled. The MIC2591B does not participate in the SMBus MIC2591B does not participate in the SMBus MIC2591B does not participate in the SMBus MIC2591B does not participate in the SMBus Alert Response Address (ARA) protocol ...
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... However, individual system analysis should be used to de- termine if fi ltering is necessary and to select the appropriate cutoff frequency for each specifi c application. Other Layout Considerations 56.7mV Figure suggested PCB layout diagram for the MIC2591B = power traces, Kelvin sense connections, and capacitor com SENSE(NOM) ponents ...
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... Power Trace From V IN PCB Track Width: 0.03" per Ampere using 1oz Cu Signal Trace to MIC2591B VIN Pin Note: Each SENSE lead trace shall be balanced for best performance & equal length/equal aspect ratio. Figure 13. 4-Wire Kelvin Sense Connections for R SENSE March 2005 ...
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Current Flow to the Load W Via to GND Plane Via to signal plane (GATE pin connection) ***C FILTER W - DRAWING IS NOT TO SCALE AND NOT ALL PINS SHOWN FOR CLARITY- *See Table 4 for part numbers and ...
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MOSFET and Sense Resistor Vendors Device types, part numbers, and manufacturer contact infor- mation for power MOSFETs and sense resistors are provided in Table 4. Some of the recommended MOSFETs include a metal (tab) heat sink on the bottom side ...
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Package Information MICREL, INC. 2180 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 ...