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| BQ24070_14 Datasheet, PDF (19/33 Pages) Texas Instruments – System Power-Path Management IC | |||
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www.ti.com
bq24070, bq24071
SLUS694G â MARCH 2006 â REVISED DECEMBER 2014
8.4.3.9 Charge Termination and Recharge
The bq2407x monitors the voltage on the ISET1 pin, during voltage regulation, to determine when termination
should occur. Termination occurs when the charge current tapers down to either 1/10th of the programmed fast
charge rate (when the MODE pin is high) or 1/25th of the programmed fast charge rate (when the MODE pin is
low). Once the termination threshold, I(TERM), is detected the bq2407x terminates charge. The RSET resistor,
connected between the ISET1 and VSS pins, programs the fast charge current level and thus the current
termination threshold level. The V(TERM) and K(SET) parameters are specified in the specifications table. Note that
this applies to both IN and USB charging.
I(TERM) =
V(TERM) Ã K(SET)
RSET
(8)
After charge termination, the bq2407x re-starts the charge once the voltage on the BAT pin falls below the V(RCH)
threshold. This feature keeps the battery at full capacity at all times.
Copyright © 2006â2014, Texas Instruments Incorporated
Product Folder Links: bq24070 bq24071
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