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BQ24295: BQ24295:

Henrik Lyager
Prodigy 10 points
Part Number: BQ24295

Hello TI technical support

We have an issue with an IC named bq24295 (I2C Controlled 3A Single Cell USB Charger).

Setup: The circuit is, except from minor differences, equivalent with circuit in application note in datasheet (bq24295, SLUSBC1B –SEPTEMBER 2013–REVISED DECEMBER 2016).

When battery voltage is below 3,2V and we wake up the IC after sleep (shipping mode), via a pulse on QON, PMID (5V to our circuit) is about 2,8V (where we expect 5V or nothing). The switch mode simply don´t start.

Do you have any suggestion to what can be wrong, or any “work around”.

Venlig hilsen/ Best regards
Henrik Lyager,
Electronic Engineer HND
R&D Sensors
Carlo Gavazzi Industri A/S
8370 Hadsten, Denmark
Phone: +45 8960 6180
E-mail: hkl@gavazzi.dk

  • 0
    TI__Expert 8230 points
    Hello Henrik,

    I'm assuming you are trying to enable OTG mode after exiting ship mode. If so, on the bq24295, the minimum battery voltage is set by the VBATLOWV threshold (REG04[1]), the threshold can be either 3V or 2.8V; if the battery voltage is below this threshold, OTG cannot start. Based on your PMID voltage, you battery voltage is most likely in this region. By default, this threshold is set to 3V, you can try changing it to 2.8V by clearing REG04[1] and see if you are able to enable OTG.