MIC2342R-2YTQ Micrel Inc, MIC2342R-2YTQ Datasheet
MIC2342R-2YTQ
Specifications of MIC2342R-2YTQ
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MIC2342R-2YTQ Summary of contents
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General Description The MIC2342 is a dual-slot power controller supporting the power distribution requirements for Peripheral Component Interconnect Express (PCI Express systems. The MIC2342 provides complete power control support for two PCI Express slots, including the 3.3VAUX defined by the ...
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... Micrel, Inc. Ordering Information Part Number Latch Off MIC2342–2YTQ MIC2342R–2YTQ (1) MIC2342–3YTQ MIC2342R–3YTQ (1) MIC2342–5YTQ MIC2342R–5YTQ Note: 1. Contact factory for availability June 2008 12V and 3V Fast-Trip Auto-Retry Thresholds 100mV (1) 150mV (1) Disabled 2 MIC2342/2342R 3.3VAUX Nominal Package Current Limit ...
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Micrel, Inc. Typical Application June 2008 3 MIC2342/2342R M9999-062008-B ...
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Micrel, Inc. Pin Configuration June 2008 4 MIC2342/2342R M9999-062008-B ...
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Micrel, Inc. Pin Description Pin Number Pin Name 5 12VINA 32 12VINB 12 3VINA 25 3VINB 16 3VOUTA 21 3VOUTB 10 12VOUTA 27 12VOUTB 8 12VSENSEA 29 12VSENSEB 13 3VSENSEA 24 3VSENSEB 3 12VGATEA 24 12VGATEB June 2008 Pin Function ...
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Micrel, Inc. Pin Description (cont.) Pin Number Pin Name 14 3VGATEA 23 3VGATEB 11 VSTBYA 26 VSTBYB 15 VAUXA 22 VAUXB 44 ONA 43 ONB 45 AUXENA 42 AUXENB 2 CFILTERA 35 CFILTERB 6 /PWRGDA 31 /PWRGDB June 2008 Pin ...
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Micrel, Inc. Pin Description (cont.) Pin Number Pin Name 1 /FAULT_MAINA 36 /FAULT_MAINB 4 /CRSWA 39 /CRSWB 48 /FAULT_AUXA 37 /FAULT_AUXB 9 /FORCE_ONA 28 /FORCE_ONB June 2008 Pin Function /FAULT_MAIN[A/B] Outputs are open-drain, asserted active-LOW digital outputs that are normally ...
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Micrel, Inc. Pin Description (cont.) Pin Number Pin Name 47 /DLY_PWRGDA 40 /DLY_PWRGDB 46 SYSPWRGD 38 /INT 17 AGND June 2008 Pin Function /DLY_PWRGD[A/B] are open-drain, asserted active-LOW digital outputs that are ...
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Micrel, Inc. Absolute Maximum Ratings 12VIN[A/B], 12VSENSE[A/B], 12VGATE[A/B], 12VOUT[A/B] .....................................................14V 3VIN[A/B], 3VSENSE[A/B], 3VGATE[A/B], 3VOUT[A/B], VSTBY[A/B], VAUX[A/B] .......................7V Digital Inputs ON[A/B], AUXEN[A/B], /CRSW[A/B], /FORCE_ON[A/B] ..................–0.5V (min) to 3.6V (max) CFILTER[A/B], RFILTER[A&B] ...................................7V Output Current /PWRGD[A/B], /DLY_PWRGD[A/B] /FAULT_MAIN[A/B], SYSPWRGD, /INT, /FAULT_AUX[A/B] 10mA ...
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Micrel, Inc. DC Electrical Characteristics 12V = 12V 3.3V, V IN[A/B] IN[A/B] over the full operating temperature range from 0°C < T Symbol Parameter V 3VGATE[A/B] Voltage GATE(3V) I 3VGATE[A/B] Charge Current GATE(3VCHARGE) I 3VGATE[A/B] Pull-down Current GATE(3VSINK) ...
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Micrel, Inc. Symbol Parameter I Digital Output Off-State Leakage LKG(OFF) Current /FAULT_AUX[A/B], /INT, /FAULT_MAIN[A/B], /PWRGD[A/B], SYSPWRGD /DLY_PWRGD[A/B] R Internal Pull-up Resistors to PULLUP VSTBY[A] /CRSW[A/B],ON[A/B], AUXEN[A/B] I Internal Pull-up Current to PULLUP VSTBY[A] /FORCE_ON[A/B] R Internal VAUX[A/B] Power DS(AUX) MOSFET ...
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... Assertion /DLY_PWRGD Delay after /PWRGD[A/B] Assertion t Internal Primary OC Detector DFLT Response Time (MIC2342 and MIC2342R) t Auto Retry Period AUTO RETRY (MIC2342R only) Notes: 1. Exceeding measurements given within the “Absolute Maximum Ratings” section may damage the device. 2. The device is not guaranteed to function outside of the measurements given in the “Operating Ratings” section. ...
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Micrel, Inc. Timing Diagrams V June 2008 V – SENSE V THFAST V THILIMIT 12VGATE 0V t OFF(12V) Figure 1. 12V Current Limit Response Timing – SENSE V THFAST V THILIMIT 3VGATE 0V t OFF(3V) Figure ...
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Micrel, Inc. June 2008 I SC(TRAN LIM(AUX) I OUT(AUX) t SC(TRAN) 0 Figure 4. VAUX Current Limit Response Timing 14 MIC2342/2342R t M9999-062008-B ...
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... Micrel, Inc. Functional Diagram June 2008 MIC2342/MIC2342R Block Diagram 15 MIC2342/2342R M9999-062008-B ...
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Micrel, Inc. Typical Characteristics June 2008 16 MIC2342/2342R M9999-062008-B ...
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Micrel, Inc. Typical Characteristics (cont.) June 2008 17 MIC2342/2342R M9999-062008-B ...
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Micrel, Inc. Functional Description Hot Swap Insertion When circuit boards are inserted into systems carrying live supply voltages (“hot-plugged”), high inrush currents often result due to the charging of bulk capacitance that resides across the circuit board’s supply pins. This ...
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Micrel, Inc. dV 12VGATE[ × INRUSH(12V OUT[A/B LOAD(12VOU T[A/B]) = × I GATE(12VSN K) C ISSP For the same p-channel power MOSFET in the previous example 1700pF and C ISSP 100µF, ...
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... Digital Outputs.” Power-Down Cycle When a slot is turned off, resistors internal to the MIC2342/MIC2342R are connected to each of the outputs to provide a discharge path for capacitors connected to the part’s outputs. The nominal output discharge resistance values for each rail are found in the “ ...
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... FLT ON[A/B] and/or AUXEN[A/B] and/or cycling the input power supplies). Internal to the MIC2342R only, a second, or auto-retry, delay counter is initiated and commences a count-up to approximately 820ms to allow the external power MOSFET to cool before attempting another power-up sequence. ...
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... Once the internal digital filter delay counter terminates, the circuit breaker trips off the previous case, the MIC2342 latches off and the MIC2342R initiates the auto-retry delay counter to count up to 820ms before attempting another power-up cycle. 22 MIC2342/2342R ...
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... Micrel, Inc. Figure 7. MIC2342R Auto-Retry Timing Diagram and Operation in Current-limit Thermal Shutdown The internal VAUX[A/B] MOSFETs are protected against damage not only by current overtemperature protection as overcurrent condition on either VAUX[A] or VAUX[B] raise the junction temperature of the MIC2342 to 140°C, all of the outputs for that corresponding slot (including VAUX) will be shut off and that slot’ ...
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Micrel, Inc. /PWRGD[A/B] and /DLY_PWRGD Digital Outputs The MIC2342 has two /PWRGD outputs and two /DLY_PWRGD outputs, one for each slot. These are open-drain, active-low outputs that are activated after power-on-reset and are normally connected by an external 10kΩ resistor ...
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... Table 1. SYSPWRGD Truth Table are already asserted after POR, the corresponding /CRSW[A/B] control signal should be used to enable the slot’s gate drive circuits to initiate a power-up sequence. For example, in order for the MIC2342/MIC2342R to switch on the VAUX supply for either slot, the pins (/CRSW[A/B], ...
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Micrel, Inc. Figure 9. MIC2342 Output Signals’ Shutdown Responses During AUX and MAIN Overcurrent Faults June 2008 26 MIC2342/2342R M9999-062008-B ...
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Micrel, Inc. Slot[A/B] Fault Reporting The MIC2342’s /FAULT_MAIN[A/B] open-drain digital output are activated after power-on-reset and become asserted when: The ON[A/B] input signals are asserted, AND • The 12VIN[A/B] or the 3VIN[A/B] input voltages is less than its respective ULVO ...
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Micrel, Inc. Applications Information Sense Resistor Selection The 12V and the 3.3V supplies employ internal current sensing circuitry to detect overcurrent conditions that may trip the circuit breaker. An external sense resistor is used to monitor the current that passes ...
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Micrel, Inc. power ground) trace should be the same width as the positive voltage power traces (input/load) and isolated from any ground and signal planes so that the controller’s power is common mode. Also, these traces should be as short ...
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Micrel, Inc. Figure 14. Suggested PCB Layout for Sense Resistor, Power MOSFET, and Capacitors June 2008 30 MIC2342/2342R M9999-062008-B ...
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Micrel, Inc. MOSFET and Sense Resistor Vendors Device types, part numbers, and manufacturer contact information for power MOSFETs and sense resistors are provided in Table 2. Some of the recommended MOSFETs include a metal (tab) heat sink on the bottom ...
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Micrel, Inc. Package Information MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. ...