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BQ24610: Some questions about BQ24610 need to be consulted

user5883945
Expert 1636 points
Part Number: BQ24610

Dears:

We have some problems when using BQ24610 to charge 4 batteries：

1. Remove the battery, VBAT will still output 16.8V. Normal BATFET should be turned off.

2. When the adapter current is 40mA, the charge complete LED have not lighting.

3. When the actual battery voltage is 16.4V, the battery will switch from fast charging mode to constant voltage charging mode. Normally, it will switch in 16.8V.

We use the reference design of EVM Board, the schematic diagram is as below. 

  • 0
    TI__Mastermind 37325 points

    Hello,

    1. Can you please capture a waveform of this occurring? With no battery, the controller will run battery detection. What are the STATx pins doing?

    2. Can you please describe in more detail what you mean? What are the STATx pins doing? What is the charge current at this time? What is the input voltage and the battery voltage?

    3. This describes the need for the voltage regulation phase. At the end of the current regulation stage, the voltage on the VFB pin is at 2.1 V (and SRN is your regulation voltage) but the battery is still not at the regulation voltage due to the impedance from the IC to the actual battery terminals. As such, the controller will slowly taper down the current into battery. This will lower the impedance drop from the IC to the battery so that it will match the desired voltage regulation. From the datasheet, "When VTTC is valid, termination is detected while the voltage on the VFB pin is higher than the VRECH threshold AND the charge current is less than the ITERM threshold." At this time charge will stop and the battery voltage will more closely match the desired battery voltage regulation.

    Thanks,

    Mike Emanuel

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