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TLV766-Q1: With the device off (no IN voltage), will a secondary supply connected to OUT damage the device?

Fidel
Prodigy 50 points
Part Number: TLV766-Q1

Hi!

I would like to know if there need to be additional parts (Schottky diode?) if we expect that a secondary supply may apply voltage to OUT/SNS.

For example:
1] The TLV766 may have 12V IN with a fixed output of 3.3V.
2] The 12V supply may be removed, turning off the TLV766 completely.
3] A secondary supply may begin supplying on the 3.3V line.

Can such a condition damage the TLV766 if there is no additional circuitry on the OUT/SNS pins?

One concern is that in case of using a diode on the output, the drop would be too significant to use the fixed 3.3V version of the TLV766.
An adjustable TLV766 circuit would have to be used that accounts for the diode's voltage drop.

Thank you!

  • 0
    TI__Genius 12040 points

    Hello,

             This device does not have reverse current protection designed in, therefore the condition you describe will cause damage to the device, if additional circuitry is not added. The Schottky diode between the OUT and IN pins of the LDO (as shown in Figure 8.1 of the datasheet) will not cause a voltage drop at the OUT pin and will prevent flow of reverse current through the LDO. This will however not prevent the flow of current altogether and the reverse current could still reach the input power supply system. An alternate method would be to have a diode at the Input pin, which would block the flow of reverse current but would create a voltage drop at the input during regular operation. Thanks!

    Regards,

    Srikanth