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TPS62160 enable pin input leakage clarification

Jeff Coletti
Expert 8755 points

Hi All

Trying to understand the enable pin input. Customer is seeing this pin float up to 1.8v with a pull up to 3.3v. Data sheet spice 1uA worst case, is that a sink or source?

Also data sheet states when pulled low a 400k load is connected to the pin. Can you clarify the operation of this 400k resistor? Is the resistor disabled/remove when pulled high? Finally if it is switched in and out what are the thresholds to pull it in and out?

Thanks

Jeff

  • 0
    TI__Guru**** 150790 points
    The 1 uA is the worst case leakage, which almost always occurs at hot (85 C). At standard room temp type testing, the leakage is 0. You won't be able to measure anything.

    Yes, the resistor is connected when the EN pin is a logic low (and therefore not connected when it is a logic high).

    Is the EN level an issue somehow? I've seen measurement issues when a scope probe or DMM (with 1-10MOhm input impedance) is connected to a node with a very high impedance pull up/down resistor. This creates a voltage divider effect and the measured voltage is lower than in reality.