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LM74700-Q1: Please help check N MOSFET

Part Number: LM74700-Q1

Hi Expert,

Our customer would like to use MCG53N06AHE3(DFN3333) for LM747000-Q1 application. The work condition is as below. Please help to check if this N MOSFET is applicable or not. Thanks.



Elec Cheng

  • Hi Elec,

    The Mosfet selected looks good in terms of VDS rating, VGS rating, Gate-Threshold Voltage. The only other parameter we need to consider is the RDS(ON) of the Mosfet - which is 8.2 mohms (max).  The acceptable value of this parameter depends on multiple points such as,

    1. Voltage drop in steady state - The RDS(ON) x ILOAD(nominal) must be within acceptable limits as per the system specification
    2. Power loss and thermals in steady state and transient - The I2R losses in the FET and the temperature rise of the FET junction temperature must be with in acceptable limits. Some other parameters which need to be taken into consideration for calculations are FET RQJA and Max. Ambient Temp.