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BQ24092: output voltage control

Manjunath G14
Expert 2075 points
Part Number: BQ24092
Other Parts Discussed in Thread: BQ25125

Hi Team,

We have selected BQ24092 IC for Single cell Li-ion battery charger for Outdoor asset tracking applications.

Charging input voltage is from the USB 5.0.

device max current is 200mA at data transmission.

Device voltage should be 3.8V constant

Battery Spec: 

Capacity:3400mAh (Min 3250mAh)
Nominal Voltage: 3.7V
Charging voltage:4.2V

1. Using BQ24092 Charger how to limit the output voltage to 3.8V.

2. How much is the time taken to charge the battery using USB?

3.Any probelm is there, If I connect the load in parallel to the battery when the battery is charging through USB?

Please support on the above questions.

  • 0
    TI__Prodigy 460 points

    Hey Manjunath,

    From my understanding you are looking to provide a system voltage of 3.8V correct? In that case you will need a additional DC/DC to step down the system voltage or a device like the BQ25125 that can provide that regulation for you. This product does not regulate the system voltage to that level. What is requiring you to have such a strict voltage range?

    In regards to charging, it all depends on how much current you want to charge and how you are handling heat dissipation. This is all system dependent but if you were to charge at 500mA then it would take about 6 hours. You can raise the charge rate but you need to ensure that you do not cause too much heat while doing so.

    There is no problem if you connect a load in parallel as long as you are okay with sharing the voltage with the battery. If you need want to operate your system separate from the battery you need a device in the BQ2407X family to since this has an additional FET to enable this functionality. 

  • 0 in reply to Manuel Diaz Corrada
    TI__Prodigy 460 points

    Hey  Manjunath, did you have any other questions?