TPS7B69-Q1: LDO short circuit protection process and if it's ok with 8V in the output port

Pengpeng Li

Part Number: TPS7B69-Q1

Tool/software:

As mentioned in below link, we conducted a Short to battery test to the output and the voltage in the LDO output port is rising to 8V. We noticed that there is maximum voltage rating for the LDO out is 7V. But we also checked the datasheet has mentioned there is short circuit protection. So here are two questions: 1. How is the behavior and process for the short circuit protection? Whether it covered the STB protection? 2. Whether it's acceptable to have 8V on the LDO output port? please help to check and let me know if any question. Thanks.

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2 months ago

0 Gregory Thompson 2 months ago

TI__Expert 4870 points

Hi Pengpeng,

1) The short circuit protection assumes a short to ground and acts to scale back the current limit for low output voltages. It does not offer protection for shorting to a higher voltage rail such as short to battery. Parts with protection features will have an expanded absolute maximum range.

2) It is not acceptable to have 8V on the output port as any violation of the abs max ratings runs the risk of permanently damaging the part. Even if VIN is high enough to mitigate damaging levels of reverse current, the high potential to ground on the part in other parts of the chip may blow out or damage them.

Best,

Gregory Thompson