TLV2211IDBVR

Binal,

The data sheet rating and the device symbolization are the only noticeable differences. The "heating problem" is unrelated to the temperature rating or the device symbolization.  Please provide more information about the performance result differences. Waveforms and partial schematic would be helpful. 

Hello,

Please find attached SCH & Reply ASAP.

Binal,

Does "heating problem" describe the temperature of the TLV2211 package or something else?

Does this happen on just one sample of "VACI" or multiple samples?

The only 'red flag' in circuit is that the output appears to go to a connector. This increases the chance to that TLV7211 will see ESD or EOS (electrostatic discharge, electrical over stress)

Ron,

We don't understand the first sentence please elaborate in detail.

The temperature reached around 85 to 100 degree Celsius. it happens in all the VACI sample IC.

We already check there is no issues in ESD or EOS.

Hello Ron,

Can we take a skype call or call for this IC solution because our R&d work is getting delay for this problem?. If it is possible then let's take a call on Monday so that  we can figure out the solution for our R&D work.

Binal,

I will explain the "first sentence" again. I do not know what "heating problem" means. Does it mean that the op amp op becomes hot when operating?  

Voltage measurement or waveforms at a few nodes for both normal operation and abnormal operating will be very helpful and should be posted before any conference call so I have time to study the data..  

Useful nodes  [U4B pin7, U2pin 1, OP1 pin 1, VR1 pin 2 , U2 pin 4]

With power off measure resistance on OP1 pins 1 and 2.  Normal would be 22k; if not 22k on a good board change resistance range on meter to get 22k then check not good board.

Ron,

We have measured the resistance in between VDD+(PIN no 5) and VDD−/GND(PIN no 2).

Case 1 (working PCB with Symbol VACC/ Part no. TLV2211CDBV): The resistance measured is in increasing manner and goes up to mega-ohms (this is perfectly working PCB)

Case 2 (not working PCB With Symbol VACI/ Part no. TLV2211IDBV ): the resistance is measured 82 kilo-ohms (this is the heating problem PCB). 

Binal,

I will try your test in the lab. I need to order sample parts to do this test. If they arrive early , I can try on Friday, otherwise it will be Wednesday. The power supply is likely common to other circuits in board, so it is uncertain if the 82k comes from the TLV2211

Gentle reminder that I do not have answers to my questions in my previous post. 

Binal,

I checked my samples with a DMM and the result was "overload" resistance. I also ran a supply current vs supply voltage check.

No differences were observed (overlapping curves). Supply current versus supply voltage.