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BQ24650: PMIC Suggestion Required

Parth Parekh
Prodigy 30 points
Part Number: BQ24650
Other Parts Discussed in Thread: BQ25798

Tool/software:

Hello,

I am looking for a PMIC with a battery charger (charging current upto 2 amp), an integrated 5v boost converter and an integrated 3.3v buck converter it would be great if someone could suggest a different cost reliable other option. I'll mention my required specification : 


Input_Voltage range : 4.5v to 24v [DC]

Buck output voltage : 3.3V

Boost output voltage : 5v 

Battery Charging : 4.25V cutoff @ 2amp charging current.

  • 0
    TI__Mastermind 18500 points

    Hello Parth,

    We do not have a integrated PMIC/battery charger IC. I recommend having a two IC's, one for charging and  one for PMIC. 

    I can help to recommend a battery charger solution. I have a few questions:

    Do you want standalone, I2C, or SMBus?

    What is the battery chemistry?

    Best Regards,

    Christian

  • 0 in reply to Christian Moyer
    Prodigy 30 points

    Standalone and i2c are preferred.
    Battery chemistry - Li-ion 

    but will it be a cost effective and efficient solution ?

  • 0 in reply to Parth Parekh
    TI__Mastermind 18500 points

    Hello Parth,

    Parth Parekh said:
    but will it be a cost effective and efficient solution ?

    We don't have a one chip  PMIC/Charger solution, so you will need to use two IC's.

    Parth Parekh said:
    Standalone and i2c are preferred.
    Battery chemistry - Li-ion 

    With a buck topology, we typically recommend using an input 1.5V to 2V greater than the battery voltage,  taking into consideration the DC losses in the high-side FET (Rdson), inductor (DCR), and input sense resistor (between ACP and ACN), the body diode drop of RBFET between VCC and input power supply, and battery sense resistor (between SRP and SRN).

    Since your input is 4.5V and battery voltage is 4.25V, I would recommend using a buck-boost topology. I would recommend using the BQ25798 or increase your input voltage and use the BQ24650.

    Best Regards,

    Christian.

  • 0 in reply to Christian Moyer
    Prodigy 30 points

    My input voltage range varies from 4.5V to 24V. The system will be powered by both solar energy and USB-C. The USB-C will provide 5V at 2A, while the solar panel will supply 22V at 1A during the day. My system operates at 3.3V and is powered by a Li-ion battery pack with a voltage range of 3.7V to 4.2V.

    To efficiently deliver the necessary voltage to my system, I need a buck converter between the battery and the system, as well as a separate boost converter for some components that require 5V. Therefore, I am searching for a Power Management Integrated Circuit (PMIC) that includes both a buck and a boost converter, along with a battery charger.

  • 0 in reply to Parth Parekh
    TI__Mastermind 18500 points

    Hello Parth,

    Parth Parekh said:
    Therefore, I am searching for a Power Management Integrated Circuit (PMIC) that includes both a buck and a boost converter, along with a battery charger.

    As I mentioned before, we do not have a PMIC device with an integrated battery charger. You will need two seperate devices. I do not support PMIC's, so you will need to start a new thread asking for a PMIC device.

    The battery charger that you suggested, BQ24650, can only support a minimum input voltage of 5V not 4.5V. 

    Best Regards,

    Christian.