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TPS22920 / on resistance

K.Yaita
Guru 29690 points
Other Parts Discussed in Thread: TPS22920

Hi Team,

I would like to ask the following about TPS22920.

1)
Is there on-resistance(MAX) data under Vin=1.05V, Iout=-100mA condition?
The datasheet shows Iout=-200mA only.
I would like to know if on-resistance(MAX) decreases under Iout=-100mA relative to Iout=-200mA.

2)
Is there on-resistance(MAX) data under Ta=-20～70℃?
The datasheet shows the specification under Ta=-40～85℃, but I would like to know if on-resistance could be decreased under Ta=-20～70℃.
The data under Iout=-100mA condition is preferred.



I would like to replace SLG59M307V and these data is required.

Best Regards,
Yaita / Japan disty

  • 0
    TI__Genius 15740 points

    Hi Yaita,

    1) There is almost no difference between the on-resistance at Iout = 100mA and Iout = 200mA.  The reason that the on-resistance increases with a higher current load is due to the self heating of the device.  The higher the device temperature, the higher the on-resistance.  With a 200mA load, the increase in temperature at 1.05V can be calculated using:

    Increase in temperature = (theta_JA)*(I^2)*(R_ON) = (130C/W) * (200mA ^ 2) * (0.0097ohms) = 0.05C

    Doing the same calculation, a 100mA load would increase the temperature of the device by 0.013C.  This means that the on-resistance of the device at 200mA is measured at 25.05C while the 100mA load measures the on-resistance at 25.013C.  The difference in on-resistance between these two temperatures is negligible, so 200mA numbers can be used.

    2) We currently do not have enough data to guarantee a maximum on-resistance at 70C.  However, the TPS22920 only has a maximum on-resistance of 10.8mOhm vs. the SLG59M307V max of 9.6mOhm.  Both values are very similar, except the TPS22920 is able to do this with a 43% smaller package.

    Thanks,

    Alek Kaknevicius