BQ24040_16 Datasheet, PDF (15/38 Pages) Texas Instruments – Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start

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Feature Description (continued)
Apply Input
Power
bq24040, bq24041, bq24045
SLUS941F – SEPTEMBER 2009 – REVISED MARCH 2015
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 10. bq2404x Power-Up Flow Diagram
8.3.5 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 terminal goes to a high impedance state. Once the overvoltage returns to a
normal voltage, the PG terminal goes low, timer continues, charge continues and the CHG terminal goes low
after a 25ms deglitch. PG terminal is optional on some packages
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