TPSM82822: TPSM828222SILR

Manwoo Kim

Prodigy 170 points

Part Number: TPSM82822

Tool/software:

Hi!

I used TPSM828222SILR device which is fixed 1.8V DCDC.

But our board doesn't work as 1.8V DCDC, the output is near VIN(3.3V)

Actually, this dcdc shematic design are very simple, and I check many times.

So, I want to cehck the correct device are attached on the board.

What's the marking on the TPSM828222SILR? My device marked G9 2BN 05T. (Datasheet describe G92 is for IPSM828222SILR)

How about G9 29J 06T?

Please share the information! Thanks,

over 1 year ago

0 Manwoo Kim over 1 year ago

Prodigy 170 points

I found the "4" front of 05T. Is the device for TPSM828224SILR?

0 Varun John over 1 year ago in reply to Manwoo Kim

TI__Mastermind 21370 points

Hi Manwoo,

I think you might have the wrong material.

Below is a picture for the TPSM828223SILR (G93). G9 is on top row and 3 is on the bottom row.

In the pictures you sent I didn't see a 2 on the bottom row. If you see a 4, then it would correspond to G94 (TPSM828224SILR).

Best regards,

Varun

0 Manwoo Kim over 1 year ago in reply to Varun John

Prodigy 170 points

Hi, John!

Thanks for your reply!

I have more question. I do bring-up our board with TPSM828224SILR, and I found another issue.

PG signal go to the low several times, although Vout is steady. Do you have some idea? I attacehd the scope graph!

Thanks,

0 Varun John over 1 year ago in reply to Manwoo Kim

TI__Mastermind 21370 points

HI Manwoo,

The VOUT is actually not stable in the regions where PG goes low. I think the device could be operating in 100% mode since VOUT and VIN are both 3.3V.

The undershoots in VOUT are most likely caused by the undershoots in VIN. You could try increasing VIN slightly so that the VOUT can regulate well to 3.3V.

Best regards,

Varun

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TPSM82822: TPSM828222SILR