BQ24074: BQ24074RGTT IC VOUT issue

Yuvaraju Sasanamu

Part Number: BQ24074

Hi,

We are using BQ24074RGTT for Li-Po battery charger in one of our designs. lately we have observed some of the IC are not generating VOUT voltage with input being fed form USB supply.
Is this situation observed in where. We might connected the battery in reverse polarity unknowingly. But since the IC has reverse battery protection this might not cause any permanent damage to it. What we have seen on some of the boards is like permanently the VOUT is 0V. Added circuit for your reference.

what might cause this kind of permanent damage to IC ? kindly let us know.

Thank you in Advance.

Best Regards,

Yuvaraju S.

over 3 years ago

0 Anthony P Pham over 3 years ago

TI__Mastermind 23410 points

Hi Yuvaraju,

It is a bit difficult to see the schematic. When providing schematic images, please do not copy and paste the image and instead go to Insert -> Image/Video/File. This will ensure quality is retained. Can you resend the schematic so I can ensure I'm not misreading the values on resistors and capacitors?

Are you able to see the LED on /PGOOD or a voltage on TS when the VBUS is present? This can give us some information as to the state of the device.

For devices where this behavior is occurring, can you provide the following:

Voltage waveforms: VIN, VBAT, VOUT, TS
Current waveforms: IIN, IBAT, IOUT

Best Regards,

Anthony Pham

0 Yuvaraju Sasanamu over 3 years ago in reply to Anthony P Pham

Prodigy 120 points

Hi Antony Pham,

I have attached image for your reference. I can see LED is Off all the time. I will update the waveforms in some time.

Best Regards,
Yuvaraju S.

0 Yuvaraju Sasanamu over 3 years ago in reply to Yuvaraju Sasanamu

Prodigy 120 points

Please find the voltage waveform for your reference.

0 Anthony P Pham over 3 years ago in reply to Yuvaraju Sasanamu

TI__Mastermind 23410 points

Hi Yuvaraju,

As none of these voltages are behaving in the way I expect, this may be a sign of a damaged IC due to reverse battery. Are you able to switch the IC on a bad board with an IC that is behaving as expected?

Best Regards,

Anthony Pham

Power management

Power management forum

BQ24074: BQ24074RGTT IC VOUT issue