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The EVM of BQ25050/25060

Richard Chang1
Prodigy 20 points
Other Parts Discussed in Thread: BQ25050

Dear all,

I have the EVM of BQ25050/25060 on hand.

Test environment: EVM of BQ25050/25060. The adapter output voltage is 5.3V 2A, the battery is under 3.8V, the load is electronic load (in CC mode).

  1. According to the datasheet of BQ25050, the BGATE pull high when insert the adapter. But the BGATE still pull low when I insert the adapter. I can’t control the BGATE through send two pulses(force on disable) on CTRL pin to pull it high. I’m sure the IC is enable and not in supplement mode (close the electronic load).
  2. About the charge current flow, why the battery doesn’t charge when I remove the PMOS on EVM? The charge current only from OUT flow to PMOS then into battery not from BAT?
  3. The LDO isn’t work sometimes when insert the adapter.

These three questions are the same situation on our project.

Buddy, i'm almost mad, please give me some advices.

  • 0
    TI__Mastermind 31120 points

    Often electron loads interact with chargers....charger turns on and electronic load is unloaded and output overshoots so electronic load turns on (loads) and charger by then terminates.

    The first rule when testing a charger with a electronic load and there is an issue, switch to a battery and see if the issue goes away. 

    If you only have an electronic, 4 quadrant source, I would put a 10 ohm resistor across it along with a lot of capacitance....hopefully it should help going from some load to higher load.

  • 0 in reply to Charles Mauney
    Prodigy 20 points

    Hello, Charles. Thank you for your kindly reply. Even if I don't add any load and just use the battery to test, i still can't control the BGATE to turn ON/OFF the PMOS. I'm confused About the charge current flow. The datasheet describe the BGATE should be pulled high(PMOS OFF) when insert the adapter(charge mode). But in my test, i use the current meter to observe the charge current to battery. i find the battery can be charged only when the PMOS is ON. it can't be charged when PMOS is OFF(remove the PMOS from the EVM). That mean the charge current is from the Pin_OUT flow through the PMOS then into the battery. is it corrent?  The LDO doesn't work well sometimes, it is very important cuz if the LDO doesn't work(produce 4.9V), IC can't enable to charge.