TPS2560: TPS2560 OUTx pin

Hi Neo, regarding your questions:

1- Not required. The devices in question will current limit in case of a short. During the current limit operation if the device exceeds its shutdown temperature, the switch will turn off until it cools and then retry.

2- This is for any condition pulsed or static. However, extended time under abs max conditions may affect device reliability (see note 1 in the table you reference). There is no timing spec on max time, but in general abs max conditions should be avoided if possible and if not should be momentary not static. These are the max levels that the device is built to withstand - but not continuous operational levels --> the "Recommended Operation Conditions" are the intended continuous parameters to ensure expected device reliability.

Hope this helps to clarify, thanks,

Zack

Hi Zack,

Here is a waveform we captured when we "hot" short the OUT pin to GND for TPS2561 device. We observed the negative voltage on OUT pin is over -0.8V for 5us, but the TPS2561 device was not damaged. Is there still some tolerance on -0.8V abs max voltage? say more negative voltage is acceptable as long as the time duration is short enough. Can you please clarify? Is there any concern with this? There was no Schottky diode on OUT pin during testing.

Thanks

"Hot" short means shorting the OUT to GND instantaneously when TPS2561 is under normal operation.

Hi Neo, I see. I believe that there is some tolerance beyond the abs max so not too surprised the device is working after the pulse. However, from a device specification, the abs max is the official limit and any operation beyond these levels may cause damage or reduce lifetime of the product. Can you provide more detail regarding how the test is performed? E.g. how long is the connection on the OUT and how/where is the short introduced?

Also, can you share a schematic of the circuitry specific to the TPS2561? What is the configured Ilim in your design?

Thank you - Zack

Hi Zack,

Here is the schematic.

The short point is red cycled location with short wires (10-15cm) to Ground. Voltage near OUT1 pin was captured with negative voltage >-0.8V for about 5us.

Thanks

Neo

Hi Neo, thank you for sharing the sch. Let me review and discuss internally - will followup in the next day. - Zack

Hi Zack,

Any update on this topic?

Thanks

Neo

Hi Zack,

Is there any conclusion after your internally discussion? Is a Schottky diode is required?

Thanks

Neo