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TPS22976: On-state resistance

K.Yaita
Guru 29720 points
Part Number: TPS22976

Hi Team,

The datasheet shows the value under Iout=-200mA for On-state resistance (Ron).
Is there any data (max value of Ron) under Iout=-1A?

I would like to know the value under VBIAS=5V and VBIAS=3.3V conditions.

Best Regards,
Yaita

  • 0
    TI__Genius 15780 points

    Hi Yaita,

    On-resistance varies as a result of higher temperature, not higher current. Therefore, the on-resistance at IOUT=1A is dependent on how much the device heats up because of the dissipated power. For this device, the typical on-resistance is ~14mΩ, so with 1A of current passing through it, it will dissipate 14mW of power. Since the theta-JA resistance for this device is 50.8°C/W, the device will only heat up 0.71°C. Because the self-heating is very small, the typical on-resistance value at IOUT=200mA can be used.

    For VBIAS=5V, the typical on-resistance is 14mΩ. For VBIAS=3.3V, it will be between 14mΩ and 18mΩ. What VIN voltage are you looking to get the on-resistance for?

    Thanks,

    Alek Kaknevicius