• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 176 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25606: Single cell charger and boost recommendation

Samo Smodiš
Intellectual 270 points
Part Number: BQ25606

Tool/software:

Hello,

We are developing a single cell 5V power supply and we need some recommendations regarding which IC to use and any possible reference designs.

Project requirements are as follows.

  1. The power supply uses a single Li-ion cell as its power source.
  2. On its output it must provide a stable 5V with a maximum load current of 1 A.
  3. The output must be stable even with no load attached.
  4. The cell must be charged from a 5V source.
  5. The power supply is disconnected from the load when charging so simulataneous discharging and charging is not necessary.
  6. The power supply must have a simple capacity indication. 
  7. The power supply must have protection features to prevent cell damage, or any other component damage.

Please let me know your suggestions on how we can achieve the above requirements in the most straightforward way possible.

Thank you and best regards,

Samo Smodiš

  • 0
    TI__Mastermind 40305 points

    Hi Samo,

    Are you looking for a power supply or a battery charger IC? Most if not all of our charger ICs do not have a gauge on them.

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Intellectual 270 points

    I am looking for an IC with which I can implement all of the above functions so as to function as a power supply for the rest of the circuit. One of the functions is to charge the battery, yes, but I also require the functinality to boost the cell voltage to 5V, so I do not know if this counts as a battery charger or if it has some other name.

    The best candidate I have found so far is MPS MP2632B. But since I am quite familiar with TI's products and like using them, I am wondering if I can get a similar alternative from your side.

  • +1 in reply to Samo Smodiš
    TI__Mastermind 40305 points

    Hello,

    Our battery chargers with NVDC architecture regulate the System voltage above SYSMIN when the battery is below SYSMIN and slightly above the battery voltage when the battery is above SYSMIN. For example if SYSMIN is 3.5V and the battery is 3.1V, SYS will be 3.5V and battery will be 3.1V. If SYSMIN is 3.5V and battery is 3.8V, SYS will be slightly higher than 3.8V.

    In battery only mode the BATFET is not a boost converter, so the SYS voltage will always be less than the battery voltage.

    The only way to obtain a regulated 5V rail from the battery is to use a boost converter or OTG (if the device has it).

    Like I said before, most if not all of the battery chargers do not have gauges built in.

    You will likely need both a battery charger to charge the battery and a separate boost converter for the 5V rail as well as a gauge for the battery percentage.

    Regards,

    Mike Emanuel