BQ2003: Charging

Murugavel49498

Part Number: BQ2003

Hello,

We use BQ2003 to charge 9.6V battery pack ( 8 cells x 1.2V). The input supply is 15V. Many times it gives wrong indication of charging complete when it is not charged fully. Please suggest some check points to sort out this issue.

Regards,

Murugavel A N

over 5 years ago

0 Kedar Manishankar over 5 years ago

TI__Mastermind 24075 points

Hi Murugavel,

CHG status pin indicates what state of charge BQ2003 is in. Figure 3. State diagram shows how CHG pin should behave during trickle charge, battery absent, fast CHG and when charge complete. You can also look at Figure 2. Charge cycle phase, to see how CHG should behave.

0 Murugavel49498 over 5 years ago in reply to Kedar Manishankar

Prodigy 170 points

Hello Kedar Manishankar,

Thanks for the reply.

The CHG pin status changes okay, but it gives charging complete signal before the battery is fully charged. The indication is misguiding.

Regards,

Murugavel. A N

0 Kedar Manishankar over 5 years ago in reply to Murugavel49498

TI__Mastermind 24075 points

Hi Murugavel,

What is battery voltage sensed by BQ2003 when CHG status indicates charge complete? Can you show a waveform of charge current, CHG, and vbat (sensed by BQ2003)?

0 Kedar Manishankar over 5 years ago in reply to Kedar Manishankar

TI__Mastermind 24075 points

Hi Murugavel,

We have not heard from you in a while and assume your issue has been resolved. If not feel free to ask questions.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

Power management

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BQ2003: Charging