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MIC2591B-2BTQ Datasheet(PDF) 4 Page - Micrel Semiconductor |
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MIC2591B-2BTQ Datasheet(HTML) 4 Page - Micrel Semiconductor |
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4 / 34 page  MIC2591B Micrel March 2005 4 M9999-033105 Pin Description Pin Number Pin Name Pin Function 5 12VINA 12V Supply Power and Sense Inputs: Two pins are provided for Kelvin 32 12VINB connection (one for each slot). Pin 5 is the (+) Kelvin-sense connection to the supply side of the sense resistor for 12V Slot A. Pin 32 is the (+) Kelvin- sense connection to the supply side of the sense resistor for 12V 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. 12 3VINA 3.3V Supply Power and Sense Inputs: Two pins are provided for 25 3VINB connection (one for each slot). Pin 12 is the (+) Kelvin-sense connection to the supply side of the sense resistor for 3V Slot A. Pin 25 is the (+) Kelvin- sense connection to the supply side of the sense resistor for 3V 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. 16 3VOUTA 3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs (i.e., the 21 3VOUTB source terminal of the external power MOSFET). Used to monitor the 3.3V output voltages for Power-is-Good status. 10 12VOUTA 12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs (i.e., the drain 27 12VOUTB terminal of the external power MOSFET). Used to monitor the12V output voltages for Power-is-Good status. 8 12VSENSEA 12V Circuit Breaker Sense Inputs: The current limit thresholds are set 29 12VSENSEB by connecting sense resistors between these pins and 12VIN[A/B]. When the current limit threshold of IR = 50mV is reached, the 12VGATE[A/B] pin is modulated to maintain a constant voltage across the sense resistor and therefore a constant current into the load. If the 50mV threshold is exceeded for tFLT, the circuit breaker is tripped and the GATE pin for the affected 12V supply’s external MOSFET is immediately pulled high. 13 3VSENSEA 3V Circuit Breaker Sense Inputs: The current limit thresholds are set by 24 3VSENSEB connecting sense resistors between these pins and 3VIN[A/B]. When the current limit threshold of IR = 50mV is reached, the 3VGATE[A/B] pin is modulated to maintain a constant voltage across the sense resistor and therefore a constant current into the load. If the 50mV threshold is exceeded for tFLT, the circuit breaker is tripped and the GATE pin for the affected 3V supply’s external MOSFET is immediately pulled low. 3 12VGATEA 12V Gate Drive Outputs: Each pin connects to the gate of an external 34 12VGATEB P-Channel MOSFET. During power-up, the CGATE and the CGS of the MOSFETs are connected to a 25µA current sink. This controls the value of dv/dt seen at the source of the MOSFETs. During current limit events, the voltage at this pin is adjusted to maintain constant current through the switch for a period of tFLT. Whenever an overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the GATE pin for the affected slot is immediately brought high. These pins are charged by an internal current source during power-down. Also, the 3V supply for the affected slot is shut-down. 14 3VGATEA 3V Gate Drive Outputs: Each pin connects to the gate of an external 23 3VGATEB N-Channel MOSFET. During power-up, the CGATE and the CGS of the MOSFETs are connected to a 25µA current source. This controls the value of dv/dt seen at the source of the MOSFETs, and hence the current flowing into the load capacitance. During current limit events, the voltage at this pin is adjusted to maintain constant current through the switch for a period of tFLT. Whenever an overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the GATE pin for the affected slot is immediately brought low. During power- down, these pins are discharged by an internal current source. Also, the 12V supply for the affected slot is shut down. Pin Number Pin Name Pin Function 32 12VINB connection (one for each slot). Pin 5 is the (+) Kelvin-sense connection to the supply side of the sense resistor for 12V Slot A. Pin 32 is the (+) Kelvin- 25 3VINB connection (one for each slot). Pin 12 is the (+) Kelvin-sense connection to 16 3VOUTA 3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs (i.e., the 21 3VOUTB source terminal of the external power MOSFET). Used to monitor the 3.3V output voltages for Power-is-Good status. 10 12VOUTA 12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs (i.e., the drain 27 12VOUTB terminal of the external power MOSFET). Used to monitor the12V output voltages for Power-is-Good status. 8 12VSENSEA 12V Circuit Breaker Sense Inputs: The current limit thresholds are set 29 12VSENSEB by connecting sense resistors between these pins and 12VIN[A/B]. When 13 3VSENSEA 3V Circuit Breaker Sense Inputs: The current limit thresholds are set by 24 3VSENSEB connecting sense resistors between these pins and 3VIN[A/B]. When the 3 12VGATEA 12V Gate Drive Outputs: Each pin connects to the gate of an 34 12VGATEB P-Channel MOSFET. During power-up, the C MOSFETs are connected to a 25µA current sink. This controls the value of dv/dt seen at the source of the MOSFETs. constant current through the switch for a period of t overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the GATE pin for the affected slot is immediately brought high. are charged by an internal current source during power-down. supply for th 14 3VGATEA 3V Gate Drive Outputs: Each pin connects to the gate of an external 23 3VGATEB N-Channel MOSFET. During power-up, the C MOSFETs are connected to a 25µA current source. This controls the value of dv/dt seen at the source of the MOSFETs, and hence the current flowing into the load capacitance. constant current through the switch for a period of t overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the GATE pin for the affected slot is immediately brought low. During power- down, these pins are discharged by an internal current source. supply for the affected slot is shut down. Pin Number Pin Name Pin Function 5 12VINA 12V Supply Power and Sense Inputs: Two pins are provided for Kelvin 32 12VINB connection (one for each slot). Pin 5 is the (+) Kelvin-sense connection to the supply side of the sense resistor for 12V Slot A. Pin 32 is the (+) Kelvin- 12 3VINA 3.3V Supply Power and Sense Inputs: Two pins are provided for 25 3VINB connection (one for each slot). Pin 12 is the (+) Kelvin-sense connection to 16 3VOUTA 3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs (i.e., the 21 3VOUTB source terminal of the external power MOSFET). Used to monitor the 3.3V output voltages for Power-is-Good status. 10 12VOUTA 12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs (i.e., the drain 27 12VOUTB terminal of the external power MOSFET). Used to monitor the12V output voltages for Power-is-Good status. 8 12VSENSEA 12V Circuit Breaker Sense Inputs: The current limit thresholds are set 29 12VSENSEB by connecting sense resistors between these pins and 12VIN[A/B]. When 13 3VSENSEA 3V Circuit Breaker Sense Inputs: The current limit thresholds are set by 24 3VSENSEB connecting sense resistors between these pins and 3VIN[A/B]. When the 3 12VGATEA 12V Gate Drive Outputs: Each pin connects to the gate of an 34 12VGATEB P-Channel MOSFET. During power-up, the C MOSFETs are connected to a 25µA current sink. This controls the value of dv/dt seen at the source of the MOSFETs. constant current through the switch for a period of t overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the GATE pin for the affected slot is immediately brought high. are charged by an internal current source during power-down. supply for th 14 3VGATEA 3V Gate Drive Outputs: Each pin connects to the gate of an external 23 3VGATEB N-Channel MOSFET. During power-up, the C MOSFETs are connected to a 25µA current source. This controls the value of dv/dt seen at the source of the MOSFETs, and hence the current flowing into the load capacitance. constant current through the switch for a period of t overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the GATE pin for the affected slot is immediately brought low. During power- down, these pins are discharged by an internal current source. supply for the affected slot is shut down. Pin Number Pin Name Pin Function 5 12VINA 12V Supply Power and Sense Inputs: Two pins are provided for Kelvin 32 12VINB connection (one for each slot). Pin 5 is the (+) Kelvin-sense connection to the supply side of the sense resistor for 12V Slot A. Pin 32 is the (+) Kelvin- 12 3VINA 3.3V Supply Power and Sense Inputs: Two pins are provided for 25 3VINB connection (one for each slot). Pin 12 is the (+) Kelvin-sense connection to 16 3VOUTA 3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs (i.e., the 21 3VOUTB source terminal of the external power MOSFET). Used to monitor the 3.3V output voltages for Power-is-Good status. 10 12VOUTA 12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs (i.e., the drain 27 12VOUTB terminal of the external power MOSFET). Used to monitor the12V output voltages for Power-is-Good status. 8 12VSENSEA 12V Circuit Breaker Sense Inputs: The current limit thresholds are set 29 12VSENSEB by connecting sense resistors between these pins and 12VIN[A/B]. When 13 3VSENSEA 3V Circuit Breaker Sense Inputs: The current limit thresholds are set by 24 3VSENSEB connecting sense resistors between these pins and 3VIN[A/B]. When the 3 12VGATEA 12V Gate Drive Outputs: Each pin connects to the gate of an 34 12VGATEB P-Channel MOSFET. During power-up, the C MOSFETs are connected to a 25µA current sink. This controls the value of dv/dt seen at the source of the MOSFETs. constant current through the switch for a period of t overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the GATE pin for the affected slot is immediately brought high. are charged by an internal current source during power-down. supply for th 14 3VGATEA 3V Gate Drive Outputs: Each pin connects to the gate of an external 23 3VGATEB N-Channel MOSFET. During power-up, the C MOSFETs are connected to a 25µA current source. This controls the value of dv/dt seen at the source of the MOSFETs, and hence the current flowing into the load capacitance. constant current through the switch for a period of t overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the GATE pin for the affected slot is immediately brought low. During power- down, these pins are discharged by an internal current source. supply for the affected slot is shut down. |
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