TPS54335A: TPS54335ADDA

Chirag Panchal

Part Number: TPS54335A

Hi,

We are using TPS54335ADDA - buck converter in our design, generating +4V output from +14.5V input. Some how1 0% to 15% devices from the field are returning back due to TPS54335ADDA IC Failure. When we debug the failure - its due to +4V Pin (Pin no. 3) and GND ( Pin no. 4 ) are showing shorted and due to that our +4V Load unable to get supply and our products returning from field.

Can you please let us know what's the reason behind this ? The impacts are huge because thousands of our products returning back due to this same issue.

Regards,

Chirag Panchal

Sr. Hardware Engineer - Quantela Inc.

over 3 years ago

0 Zhao Ma over 3 years ago

TI__Genius 15135 points

Hi, Chirag

1. Could you send me the schematic and layout for review?

2. What is the loading range in your application?

3. Could you take a picture of IC's top marking?

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

Hi Zoaho Ma,

1. Please find schematic and Layout portion of concern failure

2. Loading Range - Peak current is 1.4A - mean/average current is 150mA

3. Please find picture of failure IC's top marking. first row - 54335A, bottom row - P3V864

0 Zhao Ma over 3 years ago in reply to Chirag Panchal

TI__Genius 15135 points

Hi, Chirag

Do you have the 2nd row information of top marking?

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

either TI 794 OR TI 79A.. not properly visible

0 Zhao Ma over 3 years ago in reply to Chirag Panchal

TI__Genius 15135 points

Hi, Sir

We didn't find this code in TI system.

Could you find/check a clear top marking?

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

from failure products this was the best possible I could provide.

0 Zhao Ma over 3 years ago in reply to Chirag Panchal

TI__Genius 15135 points

Could you check another one?

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

Hi,

The best possible info I could provide you is above. Please do the needful on above information basis.

0 Ruby Li over 3 years ago in reply to Chirag Panchal

TI__Expert 7520 points

Hi Panchal

Zhao is looking into this and will feedback to you soon.

Ruby

0 Zhao Ma over 3 years ago in reply to Chirag Panchal

TI__Genius 15135 points

Hi,

Not able to find this LTC start with 79, end with P3V8.

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

Zaho, Could you check this IC also seems failure on other threads on E2E platform we checked. This seems to be common IC failure issue. Rather than goin to batch - we want to know why IC getting failure - what is the root cause for the same ? Please support us.

0 Zhao Ma over 3 years ago in reply to Chirag Panchal

TI__Genius 15135 points

Which thread? could you send it to me?

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

e2e.ti.com/.../tps54335a-output-pin-ph-pin-3-is-shorted-to-gnd

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

e2e.ti.com/.../tps54335a-output-pin-ph-pin-3-is-shorted-to-gnd

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

e2e.ti.com/.../tps54335a-ph-short-to-ground

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

e2e.ti.com/.../tps54335a-ph-pin-short-to-gnd-after-a-period-of-time-using

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

Check out the 4 threads I posted above, just samples , there are many more threads of the same issue of PH pin and GND shorting issue. Please do the needful.

0 Zhao Ma over 3 years ago in reply to Chirag Panchal

TI__Genius 15135 points

Some bad are related with bad layout or specific application.

Right now, could you get one clear top marking? I will involve in quality team.

0 Chirag Panchal over 3 years ago in reply to Zhao Ma

Prodigy 10 points

Here the Best top marking I / our technical team could able to see from our magnifier glass. I would request your quality team also please check back and forth if any single character mislead and they can able to capture.

IC 1) first row: 54335A; second row: TI 80A; third row: P04CC4
IC 2) first row: 54335A; second row: TI 70A; third row: P32N64
IC 3) first row: 54335A; second row: TI 70A; third row: P3V664
IC 4) first row: 54335A; second row: TI 70A or 7CA; third row: P3V80A

0 Ruby Li over 3 years ago in reply to Chirag Panchal

TI__Expert 7520 points

Hi Panchal

Zhao is looking into this and will feedback to you soon.

Ruby

0 Zhao Ma over 3 years ago in reply to Chirag Panchal

TI__Genius 15135 points

Hi, Chirag

Let's talk about this by email, zhao-ma@ti.com

I will involve quality team.

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TPS54335A: TPS54335ADDA