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BQ24160: BQ24160 "Reverse Boost"?

li jongyann
Prodigy 90 points
Part Number: BQ24160

Hi Jeff,
We use the BQ24160 to design a car product.
Connect the product to the cigarette lighter for charging.
When Battery is charged to the 95%~100% range,
The recharge voltage IN (4.58V) appears when the cigarette lighter connection is removed.
Is this the Reverse Boost phenomenon?
How to avoid this phenomenon? thanks

BQ24160 is set as follows:
Input Limit for IN input : 1.5A
VIN-DPM voltage : 4.2V
Battery Regulation Voltage : 4.36V
Charge current : 550mA
Termination current : 150mA

Figure 1 shows the connection
Figure 2 shows the removal of the connector

  • 0
    TI__Guru**** 165856 points
    Hi Li,

    If the charger is still switching (frequent square wave pulses at SW) after its input power is removed and the input voltage (IN or USB) stays at a regulated voltage above the battery voltage for a short time, then yes, this is reverse boost. The reverse boost prevention circuit should prevent this from happening but there is a narrow window of battery voltage when the battery is fully charged where this can occur. Once the battery discharges outside this window, reverse boost stops. Unfortunately, we have found no way to prevent this from occurring.
  • 0 in reply to Jeff F
    Prodigy 90 points
    Hi Jeff,
    Any suggestion to work-around this ?

    Thank you
  • 0 in reply to li jongyann
    TI__Guru**** 165856 points
    Li,

    Unfortunately, no. It is an inherent architecture attribute that the reverse boost circuit did not correct.
  • 0 in reply to Jeff F
    TI__Genius 10240 points
    Hi Jongyann,

    We strive to continue provide customer the best solution. Jeff's answer is our best knowledge about this legacy part, so I am closing this thread for now. You are welcome to create a new thread if you have new question.

    Best regards,

    Eric