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Original question:

BQ24616: Output Current

BQ24616: Temperature range and thermistor settings

CC
Prodigy 60 points
Part Number: BQ24616

Hi,

The charging temperature range on the bq24616 datasheet is 0C to 60C with the charge current dropping to 50% between 0C to 10C. My battery can only charge from 0C to 45C. Will the charge current still drop to 50% (2000mA/2 = 1000mA) between 0C to 10C if I set the max temperature to 45C?

 

The battery data sheet specifies that the battery charge at 0.35C (0.35 x 4400mA = 1540mA ) between 0C to 10C. I'm changing the range max to 45C. I'm concerned that the 50% charge current drop will happen for a range smaller than 0 to 10C. If so, then the charge current 2000mA will not drop below 1540mA at the batteries' specified range.

  • 0
    TI__Mastermind 24075 points
    Hi Charyne,
    When looking at the temperature ranges that BQ24616 will regulate charge current or charge voltage, you want to focus on VT1, VT2, VT3, VT4, VT5 from the datasheet EC table. All of these ranges correspond to voltages that are a % of VREF (3.3V). These thresholds relative to VREF cannot be changed and are inbuilt to the charger, and perform functions according to the JEITA standard for charging. Depending on the calculations for your THOT and TCOLD, you will get RT1 and RT2 values (depending on your thermistor datasheet RTHOT and RTCOLD) and then you can calculate for the voltage VT2 and see what temperature that corresponds to, and below that will be when your charger regulates 50% of ICHG. If these values are not satisfied for battery datasheet, then external logic will be needed to configure the temperature window.