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MIC2342-3YTQ Datasheet(PDF) 5 Page - Micrel Semiconductor |
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MIC2342-3YTQ Datasheet(HTML) 5 Page - Micrel Semiconductor |
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5 / 32 page  Micrel, Inc. MIC2342/2342R June 2008 5 M9999-062008-B Pin Description Pin Number Pin Name Pin Function 5 32 12VINA 12VINB 12V Supply Power and Sense Inputs [A/B]: Two pins are provided for Kelvin 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 MIC2342 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 lower than its lockout threshold voltage. 12 25 3VINA 3VINB 3.3V Supply Power and Sense Inputs [A/B]: Two pins are provided for 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 MIC2342 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 lower than its lockout threshold voltage. 16 21 3VOUTA 3VOUTB 3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs. Used to monitor the 3.3V output voltages for 3.3V Output Power-is-Good status. 10 27 12VOUTA 12VOUTB 12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs. Used to monitor the 12V output voltages for 12V Output Power-is-Good status. 8 29 12VSENSEA 12VSENSEB 12V Circuit Breaker Sense Input [A/B]: The current limit thresholds are set by connecting sense resistors between these pins and 12VIN[A/B]. When the 12V primary overcurrent detector current-limit threshold of 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 or tDFLT (whichever is shorter), the circuit breaker is tripped and the corresponding 12VGATE pin for the affected slot is immediately pulled up to its corresponding 12VIN to turn OFF the external MOSFET. 13 24 3VSENSEA 3VSENSEB 3V Circuit Breaker Sense Input [A/B]: The current limit thresholds are set by connecting sense resistors between these pins and 3VIN[A/B]. When the 3V primary overcurrent detector current-limit threshold of 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 or tDFLT (whichever is shorter), the circuit breaker is tripped and the corresponding 3VGATE pin for the affected slot is immediately pulled down to AGND to turn OFF the external MOSFET. 3 24 12VGATEA 12VGATEB 12V Gate Drive Outputs [A/B]: Each pin connects to the gate of an external P- channel power MOSFET. During power-up, the external CGATE (if used) and the CGS of the external MOSFETs are connected to a 25µA current sink. This controls the value of dv/dt seen at the source of the MOSFETs, and hence the current flowing into the 12V load capacitance. During current limit events, the voltage at this pin is adjusted to maintain constant current through the FET for a period of tFLT or tDFLT (whichever is shorter). Whenever an overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the corresponding 12VGATE pin for the affected slot is pulled up to its corresponding 12VIN pin to turn OFF the external MOSFET. |
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