TPS62932: TPS62932 setup as inverting converter

Kaare Sorensen

Part Number: TPS62932
Other Parts Discussed in Thread: TPS62933

I am designing in the TPS62932 into a new product. We need 4 of them in each product and maybe 5 if it works well as an inverting converter.

We have 16-22V Input and need to get -15V at 0.5A output.

Do you have any schematics where the TPS62932 or TPS62933 is used as inverting converter?

The other power rails are straight forward and I already designed them with the TPS62932.

over 2 years ago

+1 Ruby Li over 2 years ago

TI__Expert 7430 points

Hi Sorensen

Please see the reference design in the below link: https://www.ti.com/tool/TIDA-050053. Hope this helps.

Ruby

0 Kaare Sorensen over 2 years ago in reply to Ruby Li

Prodigy 30 points

Hi Ruby. Thank you for the fast response. Yes this is what I were looking for. Should be able to design my circuit using the reference design.

0 Kaare Sorensen over 2 years ago in reply to Ruby Li

Prodigy 30 points

Sadly it is not possible to get the the -15V out with the 20V input. It is above the 30V total limit from VIN to VOUT.

"The input voltage that can be applied to an inverting buck-boost converter IC is less than the input voltage
that can be applied to the same buck converter IC. This is because the ground pin of the IC is connected to
the (negative) output voltage. Therefore, the input voltage across the device is VIN to VOUT, not VIN to ground.
Thus, the input voltage range of the TPS62933 device is 3.8 V to 30 V – VOUT, where VOUT is a positive
value."

I will have to design in another part for the negative or do a split design for the +15 and -15.

0 Ruby Li over 2 years ago in reply to Kaare Sorensen

TI__Expert 7430 points

Hi Sorensen

Got you. You may need to turn to WV team for the device.

Ruby

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TPS62932: TPS62932 setup as inverting converter