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TPS22860: Elevated voltage tolerance

Part Number: TPS22860
Other Parts Discussed in Thread: TPS22810

In a previous forum post, the OP implies they will be connecting 6V to a part with absolute maximum rating for 5.5V.

Due to #ASTOCKALYPSE2021, we have an urgent need to design out TPS27081 which had 8V tolerance. We have an immediate demand of ~500 pcs which we can't fill anywhere.

1. Is there characterization data on voltage tolerance of this device from the fab?

2. What are the implications of operating TPS22860 device at 7V, 1A?

  a.) Burnout/channel damage

  b.) excess power dissipation in the channel r_dson and friends, where we could heat sink and effectively get away with it?

  c.) some other reason why exceeding these specs is a generally bad idea

  • Hi Ryan,

    1. No we do not have characterization data for any voltage outside the recommended operating conditions. While 6V is outside recommended operating conditions, it is just within the Abs max and so we expect the device to work though we do expect to see some variation from datasheet figures. This operation is not recommended but is acceptable if the risks are acceptable in the system.

    2. 7V is outside the Abs max of this device. This can cause damage to the device if used in this condition. We do not recommend using this operating voltage in any case. We do not guarantee a failure mode but a fail open and fail close event are probable.

    I would recommend using TPS22810 if possible. This device is capable of handling higher voltage.

  • Thanks for the information, Shreyas, I missed the Abs_max as 6.5. Unfortunately TPS22810 is also out of stock everywhere so we can't use it at this time.

    I think we have a solution where we are forced to design out the need for the switch in our use case.