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LM22676: Output Power Applied, Input Unpowered

Part Number: LM22676

What, if any, are the consequences of applying an output voltage sourced from another power supply with the input unpowered but connected to various components. This is an adjustable version set to 5.25V.

In the unusual condition:

The Vo = 5.218V. We lifted pin 8 and measured 14.0 mA into pin 8.

We measured Vfb (pin pin 4) to be 0.0V. The current into pin 4 was 1.69mA.

We lifted pin 7 (Vin) and measured the current out of pin 7 to be 11.22 mA and the Vin = 4.66V

After the unusual condition, there appears to be no damage and the supply still functions normally when powered properly from Vin.

Regards,

Larry