TPS43061: Recommended FET with 40V VDS

Ryoma Ohashi

Part Number: TPS43061
Other Parts Discussed in Thread: CSD87334Q3D, CSD87333Q3D, CSD18543Q3A, CSD18514Q5A

Hi team,

Related to this thread,

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1213167/tps43061-recommended-fet?tisearch=e2e-sitesearch&keymatch=%25252525252520user%2525252525253A520939#

My customer is considering to use TPS43061RTER for their system. We have proposed CSD87334Q3D or CSD87333Q3D for the FETs. But they requires FET that have 40V VDS. Could you give us some recommendation from the 40V line up?

Regards,

Ohashi

over 1 year ago

0 Niklas Schwarz over 1 year ago

TI__Mastermind 22090 points

Hi Ryoma,

Thanks for using the e2e forum.
Due to a conference, responses currently may get delayed a bit.
I will look into your this case and get back to you by tomorrow.

Thanks for your patience.

Best regards,
Niklas

0 Ryoma Ohashi over 1 year ago in reply to Niklas Schwarz

TI__Expert 3250 points

Hi Niklas,

Thanks for your support.

Any update here?

Regards,

Ohashi

0 Niklas Schwarz over 1 year ago in reply to Ryoma Ohashi

TI__Mastermind 22090 points

Hi Ryoma,

Sorry for the long delay.

I went through some reference design of newer part to look for common FET choices in similar applications, but it is difficult to find the best recommendation.
As I am no expert on TI FETs, I can only go through the part search myself and check the specs.
https://www.ti.com/power-management/mosfets/n-channel-transistors/products.html#267=35%3B45&

I have also looped in the FET team once more, so they can give more insights on suitable part choices.

Best regards,
Niklas

+1 John Wallace1 over 1 year ago in reply to Niklas Schwarz

TI__Mastermind 32415 points

Hello Osashi-san,

Thanks for your interest in TI FETs. TI does not have any 40V power block devices. This would require discrete FETs. I'd recommend the CSD18514Q5A (40V NFET in 5x6mm SON package) or the CSD18543Q3A (60V NFET in 3.3x3.3mm SON package). The CSD18543Q3A is a smaller solution but estimated power loss is a little higher vs. the CSD18514Q5A. These are both the lowest cost discrete FETs for this application. I'm attaching the FET selection spreadsheet I used to do the power loss estimates for your review.

Best Regards,

John Wallace

TI FET Applications

3441.SYNC-BOOST-FET-LOSS-CALC_Rev1_Ohashi.xlsm

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TPS43061: Recommended FET with 40V VDS