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BQ24076: LED not turning on

sandeep kothapally
Prodigy 40 points
Part Number: BQ24076
Other Parts Discussed in Thread: BQ24072, BQ24075, BQ25180

I am using BQ24076RGTR. While charging the battery LED2 turning ON. I am using 3.7V nominal Li-Ion battery so It can go upto 4.2V. when bat voltage reached to  4.2,LED1 should ON for status of BATTERY fully charged. But In my case LED1 not turning ON even Battery fully charged

  • 0
    TI__Mastermind 22120 points

    Hi Sandeep,

    Welcome to E2E! 

    The BQ24076 has a battery charge voltage of 4.4 V which would be why the device is not saying the charge complete. The devices in the BQ2407X family that have a 4.2 V charge voltage are the BQ24072 to BQ24075 which are pin to pin compatible if you're able to acquire them.

    Similarly, there are T versions of some of the devices in the family which you can check out here: https://www.ti.com/lit/ds/symlink/bq24072t.pdf . All of these devices have a battery charge voltage of either 4.2 or 4.1 which would be more suitable for your application than the BQ24076. The only difference is the battery temperature monitoring method which will need a slight schematic change (look in the Battery Temperature Monitoring section of the datasheet for more information). 

    If not, you'd need to measure the battery voltage and switch the /CE pin to high to stop charging. 

    If you're interested, we do have the BQ25180 which released last year. It's an I2C configurable refresh of the BQ24072 family and includes features such as ship mode and shutdown mode as low Iq modes. 

    Best Regards,

    Anthony Pham

  • 0 in reply to Anthony P Pham
    Prodigy 40 points

    So Cant I get LED turn ON right?Then what are the use of those two LEDS with 4.2V battery 

  • 0 in reply to sandeep kothapally
    TI__Mastermind 22120 points

    Hi Sandeep,

    In this scenario yes, the LED can't be turned even though we know that 4.2 V is where a 4.2 V battery is fully charged.

    As previously mentioned, the BQ24076 is a 4.4 V battery charger and so will reflect the charger status as if the battery that is connected is supposed to be charged to 4.4 V. As it sees the battery is 4.2 V, it will not reflect this on the /CHG pin.

    The /PG LED is used to determine power good. The /CHG pin is used to indicate charge completion of the battery (which again is 4.4 V for BQ24076).

    Best Regards,

    Anthony Pham