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TPS22958: Is it normal to have certain resistance between Vout and GND?

Seongho Kim
Prodigy 10 points
Part Number: TPS22958
Other Parts Discussed in Thread: TPS22810

Hi,

I'm currently working with a circuit with multiple TPS22958Ns which are connected in cascade;

The circuit is shown below.

The problem is, when VBIAS is 5V, whether ON is low or high,

the resistance between VOUT and GND (for both TPS22958) is 68 ohm, which is not what I expected.

Due to this resistance, power dissipation is happening.

In function block diagram, TPS22958 has MOSFET between VOUT-GND, but it says it is not featured in the TPS22958N,

So my question is...

1. Is it normal to have 68 ohm of resistance between VOUT and GND?

2. How can I cut the linkage between VOUT and GND?

3. I am planning to replace TPS22958 to TPS22810. Will TPS 22810 have the same problem?

  • 0
    TI__Genius 15740 points

    Hi Seongho,

    With the TPS22958, it is normal to have this resistance on VOUT when the device is disabled. This is called Quick Output Discharge (QOD). If you are looking to get rid of this resistance, you can use the TPS22958N or the TPS22810 without the QOD pin connected to VOUT.

    Thanks,

    Alek Kaknevicius