Datasheet

ApplyInput
Power
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
Ispowergood?
V
BAT
+V
DT
< V
IN
< V
OVP
& V
UVLO
< V
IN
No
Yes
Ischipenabled?
V
TS
> V
EN
No
Yes
TurnonPGFET
PGpinLOW
bq24090, bq24091
bq24092, bq24093
www.ti.com SLUS968A –JANUARY 2010–REVISED FEBRUARY 2010
Figure 21. 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
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 17
Product Folder Link(s): bq24090 bq24091