TPS7A4501-SP: TPS7A4501-SP — Safe Reverse Current (Backfeed) Limit on VOUT (≈2 mA)

robert williams

Part Number: TPS7A4501-SP

Tool/software:

I am using the TPS7A4501-SP LDO configured for a 3.7 V output. In my application, there are conditions where an external circuit can backfeed current into the regulator output (VOUT) while VIN is at its normal operating voltage (i.e., VIN > VOUT). Backfeed current: approximately 2 mA (DC) into VOUT. Regulator input: VIN > VOUT at all times.

Can the TPS7A4501-SP safely tolerate ≈2 mA of reverse current into VOUT without reliability concerns? If not 2mA, how much current can it tolerate?

If not recommended, what failure or degradation mechanisms might occur (e.g., reverse conduction through internal pass transistor)?

Thank you for clarifying how much reverse current the TPS7A4501-SP can tolerate and what design precautions are advised.

7 days ago

0 Sarah Koch 7 days ago

TI__Genius 12240 points

Hi Robert,

Just want to make sure I understand your scenario. You're thinking of a scenario where VOUT is forced negative from downstream circuitry on the VOUT rail, for example? If not, could you clarify a bit further?

Thanks,

Sarah

0 robert williams 3 days ago in reply to Sarah Koch

Prodigy 10 points

VOUT is forced positive, towards the external circuit power supply. The external circuit operates at a higher voltage than the TPS7A4501-SP.

0 Sarah Koch 3 days ago in reply to robert williams

TI__Genius 12240 points

Thanks for the additional detail,

If VOUT is forced higher than the set VOUT voltage, but remains lower than VIN (you had mentioned VIN>VOUT at all times), I would not expect reverse current due to the voltage drop across the part. But let me know if you are thinking about this differently.

All the best,

Sarah

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TPS7A4501-SP: TPS7A4501-SP — Safe Reverse Current (Backfeed) Limit on VOUT (≈2 mA)