TPS61322: TPS613222ADBVR Overheating

Leon Linder

Part Number: TPS61322

Tool/software:

Hello everyone,
I have just tried out a new circuit board with a TPS613222ADBVR.
I am using the boost for the power supply of 2 instrumentation amplifiers, i.e. in the low current range.
When the instrumentation amplifiers did not work as usual, I checked the board and tested the boost.
The output voltage is only 2.2V and the supply voltage also drops from 3.3 to 2.8V. The component also gets very warm and the magic smoke appears.
Here is the circuit design (taken from the Webbench Power designer):

Also the section of the PCB:

Does anyone have any idea what I am doing wrong and why the TPS613222ADBVR is overheating?

Many thanks and best regards
Leon

over 1 year ago

0 Leon Linder over 1 year ago

Intellectual 450 points

I think I have found the error.
The TPS613222ADBV has two NC pins, one of which should be connected to GND and one to VOUT. The schematic of the Webbench and Eagle do not match at this point, so I swapped the two.

Can I cut the pins off the component and then simply use the component? This would currently be a quicker and cheaper solution than ordering a completely new PCB.

Here is a comparison of the two schematics and PCB:

best

Leon

0 Nini Zhong over 1 year ago in reply to Leon Linder

TI__Genius 13205 points

Hi Leon,

You can't cut these two pin off, it would affet the normal behavior and the heat dissipation. Do you need 2.8V Vin and 2.2V Vout?

0 Leon Linder over 1 year ago in reply to Nini Zhong

Intellectual 450 points

I need 5V Vout and have 3,3V Vin. I think the problem is that the two NC pins on my PCB are swapped. So what should be at GND is at Vin and vice versa.