MP2760 Model and Implementation Clarifications

Battery Management
1
  1. Since I cannot currently find the MP2760GVT-040A variant of the IC in stock right now, I was wondering how the factory default settings are implemented. For example, would the 4 cell factory default of this variant be pre-written to OTP, or are they stored in some separate non-volatile memory? If it is not already written to OTP, can I just purchase a different version of the chip and write the default OTP value to be a 4s config?
  2. I also wanted to confirm that the 6A output current is only a limit on output back from to the source line (such as an implementation of forward and reverse charging from a battery pack through a single usb c port).
  3. What is the I_sys limit? There are 2 different limits listed on the datasheet. What is the intended use of this power output? What is this regulated to?
  4. I also wanted to confirm that neither of these values (in points 2 and 3) will have any impact on the current output limit of the unregulated power from the battery cells (battery discharge current), since I only want my battery management IC to be responsible for that limit.
  5. Is the I2C line already pulled up to 3.3V internally, or do I need to implement an additional VRM IC to my board since I am using 3.3V logic.
2

Hello @gruiz4,

Please find my responses to your questions below

  1. The default settings are stored in some separate in some separate non volatile memory.The OTP data can’t be changed and the part will reset once powered on again plus the Vbatt_reg accuracy might be affected since different suffix parts are suitable for different number of cells. So I would highly recommend ordering the part with suffix codes for designated cell count application.

  2. I didn’t understand clearly. 6 A is the recommended output current for safe operation.

  3. The system current or I_sys is generally dependent on Vin, Iin_lim , MOSFET peak/valley current limit,inductance and even thermal dissipation. What is your desired Vin, Vsys and system power? MP2760 supports Isys upto 6 A.

  4. It depends as the Isys is basically refers to the power delivered by the battery charger and system can sink more power if Vbatt is higher enough. What’s the maximum discharge current are you targeting for?

  5. The I2C pins need to be pulled up externally.