BQ24090_12 Datasheet, PDF (16/34 Pages) Texas Instruments – 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger

bq24090, bq24091
bq24092, bq24093
bq24095
SLUS968D – JANUARY 2010 – REVISED DECEMBER 2012
Apply Input
Power
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Is power good?
V_BAT+V_DT < V_IN < V_OVP
No
& V_UVLO < V_IN
Turn on PG FET
PG pin LOW
Yes
Is chip enabled?
No
V_TS > V_EN
Yes
Set Input Current Limit to 100 mA
and Start Charge
Perform ISET & OUT short tests
Remember ISET2 State
Set charge current
based on ISET2 truth
table.
Return to
Charge
Figure 20. bq2409x Power-Up Flow Diagram
Overvoltage-Protection (OVP) – Continuously Monitored
If the input source applies an overvoltage, the pass FET, if previously on, turns off after a deglitch, t_BLK(OVP). The
timer ends and the CHG and PG pin goes to a high impedance state. Once the overvoltage returns to a normal
voltage, the PG pin goes low, timer continues, charge continues and the CHG pin goes low after a 25ms
deglitch. PG pin is optional on some packages
16
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