TPS27081A: 3A at 3.3V

Cameron Perl

Part Number: TPS27081A

Hey team,

Just a clarifying question on how the device performs. At Vgs = 3.3, the device should still be able to supply 3A, correct? Figure 3/4 only going up to 2.5A is making it appear as if it doesn't.

Thanks,

Cam

over 1 year ago

+1 Kalin Burnside over 1 year ago

TI__Genius 13260 points

Hello Cam,

It will depend on your ambient temperature. The power dissipated at 3.3V with 3A is ~693mW, and the max power dissipation of the device at 75C Ta is 714mW. As long as the application Ta is below 75C it should be fine to operate at 3A at 3.3V.

Reegards,

Kalin Burnside

0 Cameron Perl over 1 year ago in reply to Kalin Burnside

TI__Expert 3970 points

Hi Kalin,

One more quick question. Did you get those max power numbers from the following:

693mW=(3A^2)*77mhom?

714mW=(150ºC-75ºC) / (105ºC/W)?

We're concerned that it won't have a high enough margin for their reliability target..

Also I think I misunderstood their specifications. It appears they are operating at -3V/3A rather than positive. Based on figure 9 SOA graph, this shouldn't work, right?

Thanks,

Cam

+1 Kalin Burnside over 1 year ago in reply to Cameron Perl

TI__Genius 13260 points

Hello Cam,

You're correct, that is how I got those values. The ABS minimum voltage on the input is -0.3V. This device is not meant to be used under those operating conditions.

Regards,

Kalin Burnside

0 Cameron Perl over 1 year ago in reply to Kalin Burnside

TI__Expert 3970 points

Is there a device in our portfolio that fits these requirements?

+1 Kalin Burnside over 1 year ago in reply to Cameron Perl

TI__Genius 13260 points

We do not have any bidirectional load switches or ones that you can apply -3V to the input. What is the application and purpose for using it in this manner?

0 Cameron Perl over 1 year ago in reply to Kalin Burnside

TI__Expert 3970 points

Following up offline.

Power management

Power management forum

TPS27081A: 3A at 3.3V