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Original question:

BQ25798: REGN LDO is Not Turning ON

BQ25798: BQ25798

giovanny Mateus
Prodigy 90 points
Part Number: BQ25798

Tool/software:

I had a similar Problem, The REGN does not generate the 5V. When the PMIC is implemented as single input.

in other project, i implemented successfully  a dual input charger following the specification of  " BQ25798, Application Diagram with Two Input Sources and Ship FET".

Now i tried to use the same PMIC for a simple 4S charger.. But it is not working. also:

  • Could you please  point me out to a "VBUS input Only" reference design.
  • Is threre a better or moer suitable PMIC for charging 4-cell , with discharge current up to 3A..

  • 0
    TI__Guru**** 166626 points

    HI Giovanny,

    The design above is correct for single VBUS with no input MUX.  REGN comes up automatically if VBUS is valid (not overvoltage and passes poor source).  BQ25798 is good for 4 cell, 3A discharge design if you add TVS zener diode to protect 20 V BAT, BATP and SYS pins from hotplug of fully charged battery pack.  The EVM gives guidance on that. The PROG pin resistor must be sized for 4S pack.

    Regards,

    Jeff