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TPS563208: Enable threshold

Part Number: TPS563208

Hello TI,



We are using voltage regulators TPS563208, which should have enable threshold above 1,6 V according to datasheet.

But in reality voltage regulators are switched on above 4,9V at enable input. That is complication for us, because we designed schematic for 3,3V enable signal. See attached schematic.

Could You please explain me what is wrong?


Many thanks

Martin Vit 


Martin Vít

HW Development Engineer

Legal Entity Pilsen


Teslova 1 | 301 00 Plzeň | Czech Republic

P: +420 378775459


Best Regards

  • Hi,

    From the schematic, R26=100Kohm, R17=38.3Kohm, when Vin reaches to 5.7V, Vout starts to increase.
    If you use external signal to enable the device, the Ven should be higher than 1.6V. And as you know, 1.6V is the min value, so the Ven may be a little higher than 1.6V.

  • No, the behaviour is diferent. I connected to the circuit 2 power supplies. One 12V and second directly to enable pin (pin 2 of J5). (grounds are connected together) And regulators are starting, when at enable pin is 4,9V. Resistor divider R26 / R17 should have at R17 3,3V when Vin is 12V. In this case regulators doesn't work.
  • Hi all, I found the issue. I found a bug in PCB which leads to additional impedance on PCB via from 4-10KOhm which is the cause of lower voltage on EN pin -> not an IC issue.