BQ25070: BQ24075: Output is not stable with the Battery

Satish Mehta

Part Number: BQ25070
Other Parts Discussed in Thread: BQ24075

Dear TI

I am circuit shown in attachment but issue is that BQ25070 was not able to start properly on battery. it's output fluctuate and drop to approx 0.15V and keep fluctuate at the frequency of 2Hz approx. If the Input (USB 5V) is connected ot works fine and but not able start on the battery (li-ion 3.7V-4.1V). One it remain stable if the charger connects and removed back. it charging the battery as will only causing the issue when system start from the battery. Even the battery is fully charged.

over 2 years ago

0 Satish Mehta over 2 years ago

Prodigy 30 points

The part is BQ24075 Please make the correction

0 Anthony P Pham over 2 years ago in reply to Satish Mehta

TI__Mastermind 23220 points

Hi Satish,

Thanks for sharing your schematic. On the charger side, the schematic looks good (all capacitors are present, and resistors are set within the valid ranges). Are you able to share a waveform of the output voltage? What is the nature of your load (do you have a load profile?).

If you're able to share an image of the waveform at the OUT pin this would be helpful. Is the C100 capacitor close to the IC? Can you also try a 47uF capacitor?

Best Regards,

Anthony Pham

0 Anthony P Pham over 2 years ago in reply to Satish Mehta

TI__Mastermind 23220 points

Hi Satish,

I have not heard anything in reply to this and so I am marking it as closed. Feel free to start a new thread or reply to this if it is not locked.

Thank you,

Best Regards,

Anthony Pham

0 Satish Mehta over 2 years ago in reply to Anthony P Pham

Prodigy 30 points

Dear Anthony, Thanks for the suggestion. I have kept the 47uF at the output and it is stable

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BQ25070: BQ24075: Output is not stable with the Battery