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BQ25910: Proprietary and legacy adapters "fast charge" compatibility

Part Number: BQ25910
Other Parts Discussed in Thread: TPS25750, BQ25792

Hi we are currently developing a device and we are interested in the BQ25910 IC.

Our needs are:

  • "fast charging" for 1 cell (3 parallel) 18650 Li Ion batteries (preferably 3.5-4.5A)
  • to be able to use it on a 2 layer PCB
  • to be compatible with most existing type-C proprietary and legacy mobile "fast" adapters, as we do not plan to provide an adapter with the device.

We are also thinking to use the LM73100 as an ideal diode in the same design.

Please advise if this ICs are applicable or if you can suggest a better option for our needs.

Thanks in advance

  • Hi Andreas,

    As datasheet efficiency curve fig 1 on page 11 shows, to reach 4.5A * 3.8V = 17.1V output power and ~91 efficiency, you would need more than 5V input, at least 6.5V input. 

    The EVM uses a 4-layer PCB.  If you make a 2 layer PCB, please follow the layout example on datasheet page 52 exactly.

    The charger D+/D- pins provide communication with many legacy HVDPC (9V,12V) "fast" adapters.  The charger does not have CCx lines and so cannot directly communicate with USB Type C but since you would need more than 5V input to get 4.5A out, you would need a USB Type C PD port to increase the charger's input power.  For that, you will need another IC like TPS25750. 

    The BQ25910 is a parallel controller, meaning it is intended to be placed in parallel with another charger that can provide precharge of discharged batteries and charge termination.

    BQ25792 might be a better fit.  Its efficiency is slightly less but it provides precharge and termination.  It also has D+/D- but not CCx lines for USB communication so a TPS25750 USB port controller will be necessary.