TLV62095: TLV62095 IC heats and not sinking enough current

Daniel Ouro

Part Number: TLV62095
Other Parts Discussed in Thread: TPS62095

Dear Sirs,

I am starting a new design with the TLV62095 converter and i am using the guidelines advised on the datasheet. The schematic part was set like the below image:

For the design of the PCB board it was followed (strictly) the recommended guide lines on the datasheet:

When i try to tie a higher load to converter's output the device is not sinking enough current. The circuit is regulating the calculated voltage but, it only works with small loads (less than 100mA). I cannot understand what's happening because all suggested advices were followed and everyting was built based on the information on the datasheet. It seems the IC is heating a lot and then enters in thermal shutdown.

Can you help me to solve this issue? Should i consider to use the TPS62095? Is there special thermal cosiderations that should be taken in consideration (which are not in the datasheet)?

over 5 years ago

0 Daniel Ouro over 5 years ago

Prodigy 60 points

0 Sabrina over 5 years ago in reply to Daniel Ouro

TI__Expert 8420 points

Hi Daniel,

This behaviour is not expected, did you try to replace the IC with a new one? did you check if the inductor is broken?

0 Daniel Ouro over 5 years ago in reply to Sabrina

Prodigy 60 points

Hi,
Thank you for your reply.
Yes, i changed several ICs (5) and i also changed the coilcraft inductor. I also checked the inductance of the inductor and it was fine. The IC really heats a lot and it seems the thermal protection is being activated. when i connect the load (1A, for example) the IC starts by supplying the required current but then, 2 or 3 seconds later, the IC cuts the output voltage.

0 Sabrina over 5 years ago in reply to Daniel Ouro

TI__Expert 8420 points

Could you monitor the input current Iin, Vin and Vout during start up and steady operation?
Also could you send me the layout .brd files? I want to take a closer look at it. You could send them by private message if you do not wish to share it on a public forum.

What is your operating temperature range?

Do you have a TLV62095EVM? If not I would recommend to order one, it would be helpful to debug further.

0 Sabrina over 5 years ago in reply to Sabrina

TI__Expert 8420 points

Hi Daniel,

Were you able to find the root cause of this issue?

0 Daniel Ouro over 5 years ago in reply to Sabrina

Prodigy 60 points

Hi Sabrina,

I didn't felt confidance in this converter to use it on my design so i changed for another part number.

0 Sabrina over 5 years ago in reply to Daniel Ouro

TI__Expert 8420 points

HI Daniel,

This device is widely used at several customer and is specified to operate at you operating conditions therefor I am really surprised it is behaving this way on your board. But I understand you may not have time to debug and find the root cause of this issue that I believe is not chip related.
Thanks for your answer

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TLV62095: TLV62095 IC heats and not sinking enough current