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bq24266 sleep current

Amir Kazbnx
Prodigy 30 points
Other Parts Discussed in Thread: BQ24266

Hi,

I want to use the BQ24266 and I have several questions:

1) Is there a difference between sleep mode and hiZ mode (USB1,2,3 = '1') ?

2) what is the sleep mode current ?

3) ~ChG pin - Can I use this pin for logic condition as follows:

if ~Chg'= 1' then HiZ mode ?

4) What is the current consumption when no Vin is applied ? (Vin = 0V and only battery is working)

  • 0
    TI__Intellectual 1520 points

    Hi Amir,

    I will reply in order:

    1) As explained in section 7 of the datasheet the difference between the sleep mode and Hi-Z mode is first of all the conditions that cause them (Vin<Vuvlo or IUSB1/2/3 high for Hi-Z mode, Vin<Vbat+Vslp and Vin>Vuvlo for sleep mode). The sleep mode is necessary in order to isolate the battery from the input when low input voltage is applied and the device looks like in off state. In the Hi-Z mode the device is still in the on state, in-fact the biasing circuit (DRV) is still alive.

    2) I measured between 0.9 and 0.7 mA with 3.8V applied at the input and 3.8V DC supply to simulate the battery

    3) The CHG pin does not carry any information on whether the device is in Hi-Z mode or not, so the logic condition is not valid

    4) I tested the device with 3.8V DC supply to simulate the battery and the current I measure is in the range of 30-50 uA coming out of the battery.

    Let me know if you have further questions.

    Sergio

  • 0 in reply to Sergio Iannace
    Prodigy 30 points
    Hi Sergio,

    Thanks for your detailed answers.
    I have more question about BQ24266 current:
    1) What can I do in order to put the device in the less current consumption state ? (in order to save battery)

    2) Can I connect permanently CE to GND ? is the CE matter when no power in Vin ?

    3) Generally, why is HiZ state is good for ?

    4) Can I switch IUSB1,2,3 assigments during IC work ? or IUSB1-3 are read only in power up ?

    Many thanks
  • 0 in reply to Amir Kazbnx
    TI__Intellectual 1520 points

    Hi Amir,

    1) You can enter the Hi-Z mode

    2) Connecting CE permanently to GND is possible and it effectively matters as long as the input power is applied (i.e. charge is possible)

    3) The Hi-Z mode allows to reach low quiescent current state disconnecting the input from battery (i.e. the regulator is turned off) but at the same time allows the battery to enter supplement mode. 

    4) You can switch the IUSB1/2/3 while the IC is working

    Sergio

  • 0 in reply to Sergio Iannace
    Prodigy 30 points

    Thanks for the info

    :)