BQ24100_07 Datasheet, PDF (20/36 Pages) Texas Instruments – SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT IC WITH INTEGRATED POWER FETs (bqSWITCHER™)

bq24100, bq24103, bq24103A
bq24105, bq24108, bq24109
bq24113, bq24113A, bq24115
SLUS606K – JUNE 2004 – REVISED NOVEMBER 2007
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Figure 13. Battery Detection Waveform When a Battery is Inserted
Figure 14 shows the battery detection scheme when a battery is removed. Channel 3 is the output signal and
Channel 4 is the output current. When the battery is removed, the output signal goes up due to the stored energy
in the inductor and it crosses the V_OREG – V_RCH threshold. At this point the output current goes to 0A and the IC
terminates the charge process and turns on the I_DISCHG2 for t_DISCHG2. This causes the output voltage to fall down
below the V_OREG – V_RCHG threshold triggering a Battery Absent condition and starting the battery detection
scheme.
Figure 14. Battery Detection Waveform When a Battery is Removed
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