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BQ27742-G1: Alternative for power path charger

Florian Mayerle
Prodigy 60 points
Part Number: BQ27742-G1
Other Parts Discussed in Thread: TPS63050, BQ24195L, BQ25606, BQ25601

Hello,

I'm looking for an charger IC which provides my system side with 3.3V (max 0.5A needed).
Device should be charged from single Input USB/ High Voltage Adapters, Input Voltage 5 - 13.5-V.

Battery INR18650 (or similar type):
LiNiCoAlO2, 3300mAh, max charge current 2000mA

Fuel Gauge and Protection(recommended from last post):
Single Cell Li-Ion Battery Fuel Gauge With Integrated Protection bq27742-G1

I cant find any charger IC which has an system output with 3.3V for powering my Microcontroller.
I want to use a I2C interface to communicate between Hosts an IC's.
Do I need to use a non-power path charger (linear regulator or switching converter) with an  external buck converter instead? (For example TPS63050)

Would be happy if someone can give me an advice.

Greetings
Florian Mayerle

  • 0
    TI__Mastermind 24870 points

    Hello Florian,

    I'm moving this to the chargers team for further assistance.

  • 0 in reply to Kang Kang
    TI__Genius 10240 points

    Hi Florian,

    Linear charger might not be a good option as the input voltage is up to 13.5V. As the fully charged battery voltage is higher than the system voltage 3.3V, you need an external buck converter.working with a switching charger like I2C controlled BQ25601 (13.5Vin max) or BQ24195L (17Vin max) or standalone charger BQ25606 (13.5Vin max).

  • 0 in reply to ezhao
    Prodigy 60 points

    Hi Eric,

    thanks for the fast Reply.

    Out of the bq24195L Datasheet:

    S5, Pin function: When the battery falls below the minimum system voltage, switch-mode converter keeps SYS above the minimum system voltage.
    S7, E.-Char. POWER PATH MANAGEMENT:  V SYS_RANGE  = 3.5 V - 4.35 V

    Am I right that I would need an additional buck converter to keep Voltage at 3.3V with the bq24195L?

    Greetings
    Florian