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TPS22915: Asking for the design TPS22915 Load Switch spec questions

Part Number: TPS22915

Hi Team,

Customer is designing TPS22915 Load Switch. Customer have used this load switch in multiple products on both 1.8V and 3.3V rails. 

 

The load switch is rated for 2A, however when we test at the 2A point we see on both the 1.8V rail and the 3.3V rail that there is a drop of ~150 mV across the switch. This would translate to 70 - 80 mOhm of on resistance for the switch. The junction temperature (Tj) is well below 100 deg C. From the data sheet this looks to be over spec.

 

Would you please provide comment for the following questions?

 

BR,

SHH

 

  • Hi SHH,

    Welcome to E2E!

    The increase in voltage drop could be caused by the board parasitics. On-resistance, especially measured at high current loads, can read a higher value since the traces on a board can add 10s of milliohms. Are you observing this voltage drop on a customer board or using the sense pins on the EVM?

    Best regards,

    Andy Robles