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BQ24064: Drop Out Voltage

Derek Ingham
Prodigy 70 points
Part Number: BQ24064

Hello,

We are using a BQ24064 with power being supplied to the device from a USB source which provides 5V +/- 5% = 4.75-5.25V. A key parameter for our design is the dropout voltage, as we also require additional protection components in the power supply path. We are using a charge current of 300mA, so would like to know the maximum dropout voltage at this current.

The datasheet provides two dropout voltage parameters: V(do) MAX = 750mV @1A and Figure 12, a graph showing variation of dropout voltage versus temperature. . Figure 12 could be useful to us as it shows the dropout voltage over temperature varying between 0.25V and 0.375V but doesn't state what charge current the graph is based on.

Could you provide any additional information for the dropout voltage at 300mA.

    Thanks - Derek

 

  • 0
    TI__Guru 67876 points
    Hi Derek
    We can only guarantee the 750mV @ 1A value from electrical specifications table. Table 12 is intended to show how the dropout will vary with temperature, higher when hot.
    But the dropout voltage decreases with output current, for 300mA the voltage drop will be approximately half or about 400mV. Recommend evaluating the BQ24064 in your application with input voltage drop and load to determine if the performance meets you performance goals.