MAX3232 / Is charge pump brokn?

ACGUY

Hi all,

We have a problem about MAX3232EIPWR in our customer's product. Please see the attached picture.

- Ch1 : Din1 / Din2
- Ch2 : Dout1
- Ch3 : Dout2

Measure conditions are follows.
- Vcc : 3.3V
- Dinx : 3.3Vpp / 1kHz

This individual can't makes +5V. I guess the V+ charge-pump of this individual is broken.
We tried measurement to using the curve-tracer and X-ray camera for it.
However, we could not find the issue.

I have tow questions.
- Is fault location the V+ charge pump?
- Know the same precedent?

Best regards,
Nagai

over 8 years ago

0 Ron Michallick over 8 years ago

TI__Guru*** 140026 points

Nagai,

I'll start by answering your two questions.
Thinking that V+ is bad is a good guess, but I think the issue is caused by something else.
I have never seen this output waveform before. This issue is unique.

I need to see the waveform on V+ pin. Also useful would be waveform C1+, C1-, C2+ and C2-
Does this happen on one board or all boards?

0 ACGUY over 8 years ago in reply to Ron Michallick

Guru 11170 points

Hi Ron,

Thank you for your reply.
It happened in the one board of end user.
Currently, it is operating normally by the exchange of the IC.
We tried re-measurement to the short-circuit test in our mill.
However, we cant found the error.
This situation was in until now?

Regards,
Nagai

0 Ron Michallick over 8 years ago in reply to ACGUY

TI__Guru*** 140026 points

Nagai,

Were should we go with this issue now?
Non repeatable problems are rarely solved.

I also did not understand your last question.

0 ACGUY over 8 years ago in reply to Ron Michallick

Guru 11170 points

Ronald,

If we can't suggest a counterplan to our customer, they will change the IC to competitor product.

Many thanks,
Nagai

0 Ron Michallick over 8 years ago in reply to ACGUY

TI__Guru*** 140026 points

Nagai,

The customer can return the device to the distributor and request a failure analysis.

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MAX3232 / Is charge pump brokn?