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TPS7H2201-SP: enable threshold

Part Number: TPS7H2201-SP

Team,

Can you describe the difference between V-IHEN and VIN-EN?

I am attempting to switch on and off a 5V rail, but only have 3.3V logic. My initial understanding is that I can accomplish this per the V-IHEN spec and the description in section 8.3.1. " The EN pin controls the ON and OFF state of the internal FET. A voltage at this pin greater than VIHEN turns on the FET and a voltage less than VILEN turns it off" as well as the datasheet comment on page one "Low control input threshold enables use of 1.2-, 1.8-, 2.5-, and 3.3-V logic


However in this post: https://e2e.ti.com/support/power-management/f/196/t/833941 we indicated that in order to switch on a 5V rail we need at least 3.75V - this is actually only if you use the external resistor divider network correct?

VIHEN

  • Hey Michael,

    I just double checked and it looks like I was incorrect in my assessment.

    The 75% specification is meant to say "Do not enable this part before VIN gets to 75 % of its final value to ensure a nice clean startup"

    I will edit the previous one to avoid confusion for people to reference it.

    Thanks,

    Daniel