TPS57040-Q1: Package marking for TPS57040Q

Andrew Massey

Prodigy 100 points

Part Number: TPS57040-Q1

Hi,

I have soldered TPS57040 10MSOP on PCB 10 times, and still not working.

The chip i have here is package marked "5704Q".....is this correct for the TPS67040Q?

www.ti.com/.../tps57040-q1.pdf

over 3 years ago

0 Marshall_Beck over 3 years ago

TI__Mastermind 35210 points

Hello Andrew,

That appears to be the correct marking.

Can you confirm that you obtained the components from approved TI vendor?

www.ti.com/.../partlookup.tsp

Part number	Marking	Package \| Pins	Status	Description
TPS57040QDGQRQ1	5704Q	DGQ \| 10	ACTIVE	Automotive 3.5V to 42V, 500mA Buck Converter with Eco-Mode™
TPS57040QDRCRQ1	5704Q	DRC \| 10	ACTIVE	Automotive 3.5V to 42V, 500mA Buck Converter with Eco-Mode™

0 Andrew Massey over 3 years ago in reply to Marshall_Beck

Prodigy 100 points

Hi, Thanks,

The TPS57040's are in a bag from Mouser.

I am forced to assemble and test them without esd mat or strap etc, do you advise this.?

Also, why, when i change the R in the COMP pin series RC to 10k the TPS57040 stops working?...when its 133k it works. (C in the series RC was 10nF in both cases).

0 Marshall_Beck over 3 years ago in reply to Andrew Massey

TI__Mastermind 35210 points

Hello Andrew,

You need to follow appropriate ESD practices in assembly/handling.

Comp resistance impacts loop stability, hence, you have a non-ideal Comp resistance potentially in the 10kOhm case. If you would like to do a schematic review, please open another e2e thread for the review.

0 Andrew Massey over 3 years ago in reply to Marshall_Beck

Prodigy 100 points

Thanks, but the 10k shoudl have been a lot more stable than the 133k....as you know, its just a current mode buck. 10n and 10k woudl be stable for virtually any tps57040 buck schematic...i dont think its a stability issue...thanks for your comments about the esd though

0 Marshall_Beck over 3 years ago in reply to Andrew Massey

TI__Mastermind 35210 points

You are welcome.

I would recommend evaluating your component selection in the calculator tool. You can ensure the comp values are OK for your given power conditions.

Power management

Power management forum

TPS57040-Q1: Package marking for TPS57040Q