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BQ25713: Unexpected low efficiency during light system load

Antony Lin
Genius 13480 points
Part Number: BQ25713

Hi,

When the battery is fully charged already (~8.18V for a 2S battery), we found the efficiency is much lower when the system side has a light load (e.g. 0.6A) compared to heavy load (3.55A) with the table listed below.  This low efficiency number seems not aligned with datasheet.  Please share how we can debug on this.  THanks!

Antony

  • 0
    TI__Mastermind 33585 points

    Hi, Antony,

    Your full load efficiency looks low. 1) make sure to measure the voltage at the capacitor terminal, either the adapter side or system side. 2) make sure the BTST caps are fully charged to REGN voltage . 3) make sure the battery is not charging when measuring the system efficiency.