BQ24192: System Voltage

Sahil Nayak

Part Number: BQ24192

Hi TI Team,

We are powering up charger chip for the first time and battery isnt connected on BAT pin.

So in this case, we just want to know what will be the system voltage when charger chip is powered for first time without connecting battery??

over 3 years ago

0 Sahil Nayak over 3 years ago

Intellectual 450 points

Hi Team,

Any update on this??

0 Ning T over 3 years ago in reply to Sahil Nayak

TI__Guru 50761 points

Hi,

Please visit https://e2e.ti.com/support/power-management/f/196/t/877725 for BQ2419X: Schematic Review and PCB Layout Design Tips and https://e2e.ti.com/support/power-management/f/196/t/875388 for BQ2419X/2429x FAQs. FAQ#1 should be helpful to your question.

Thanks,

Ning.

0 Sahil Nayak over 3 years ago in reply to Ning T

Intellectual 450 points

Hi Ning,

We have a different question from FAQ#1. In our case, STAT pin isnt blinking and also charging is disabled. We are powering the charger chip for the first time on our custom board without connecting connecting battery. We are getting 3.65V on VSYS. Is this voltage okay?

As per my understanding, VSYS voltage should be 4.2V. Please clarify to clear the doubts.

0 Ning T over 3 years ago in reply to Sahil Nayak

TI__Guru 50761 points

Hi,

Again referring to FAQ#1. It is highly recommended to get familiar with the device operations by testing the device EVM.

1. STAT blinks when BAT not connected

The device does not have battery detection function. When battery is not connected and charging is enabled by default, the device tries to regulate VBAT to charging voltage (VREG, 4.208V default) then terminate charging. After certain time, VBAT will drop below the recharge threshold and the device charges VBAT to charging voltage (VREG) again. So the charger status indicates between charging in progress and charging complete, so STAT pin blinks. Higher VSYS ripple is also related to the behavior.

If charging is disabled with /CE pin or by register bit, the device does not charge and STAT pin should not blink, VSYS is 150 mV above the minimum system voltage (VSYSMIN, 3.5V default) as well. Please refer to https://e2e.ti.com/support/power-management/f/196/t/791416 for the details.

Thanks,

Ning.

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BQ24192: System Voltage