TPS723: TPS72301DBVR

Hi Pavel,

Thank you for asking us!

You will be able to source up to 300mA from the device before current limit triggers over all other recommended operating conditions. The exact threshold at which current limit triggers is somewhere must be between 300mA-800mA to remain in spec, and temperature dependence is responsible for most of that range. But usually, it is pretty close to 550mA.

The only drawback is that you are no longer guaranteed to meet other performance specs when Iout > 200mA. It will continue to regulate to -5V, but load regulation will decrease accuracy a bit (0.002%/mA * 300mA = 0.6%), dropout will be proportionally worse, etc.

Doing so is safe and does not risk damage. If all other conditions are safe for <200mA, it should be safe for 300mA.

Reducing input voltage is a good way to cut down on power dissipation, just be aware that dropout may be a concern with 0.5V of headroom.

Dropout is basically limited by the RDSON of the pass element, so it increases linearly with output current. Expect dropout to be 50% higher at 300mA. For safety, I would scale the max spec in the table to 750mV even though it's technically no longer a spec (after extending past 200mA) but an estimate of an extrapolated upper limit. On a practical level, 0.5V of headroom shouldn't necessarily cause dropout with typical characteristics.

Best,

Gregory Thompson