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| BQ24232HA Datasheet, PDF (20/36 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger | |||
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bq24232HA
SLUSCG4 â MAY 2016
www.ti.com
Device Functional Modes (continued)
In the precharge phase, the battery is charged with the precharge current (IPRECHG). Once the battery voltage
crosses the VLOWV threshold, the battery is charged with the fast-charge current (ICHG). As the battery voltage
reaches VBAT(REG), the battery is held at a constant voltage of VBAT(REG) and the charge current tapers off as the
battery approaches full charge. When the battery current reaches ITERM, the CHG pin indicates charging done by
going high impedance.
Note that termination detection is disabled whenever the charge rate is reduced because of the actions of the
thermal loop, the DPPM loop, or the VIN(LOW) loop.
The value of the fast-charge current is set by the resistor connected from the ISET pin to VSS, and is given by
the equation:
ICHG = KISET / RISET
(4)
The charge current limit is adjustable from 25 mA to 500 mA. The valid resistor range is 1.8 k⦠to 36 kâ¦. Note
that if ICHG is programmed as greater than the input current limit, the battery does not charge at the rate of ICHG,
but at the slower rate of IIN(MAX) (minus the load current on the OUT pin, if any). In this case, the charger timers
are proportionately slowed down.
Begin Charging
Yes
Battery short detected ?
No
Start Precharge
CHG = Low
No
VBAT > VLOWV
Yes
No
tPRECHARGE
Elapsed ?
Start Fastcharge
ICHARGE
set by ISET
End Charge
Flash/CHG
No
I BAT< ITERM
Yes
Charge Done
CHG = Hi-Z
No
tFASTCHARGE
Elapsed ?
End Charge
Flash CHG
Yes
Termination Reached
Q2 Off
Wait for V BAT< VRCH
No
VBAT < VRCH
Yes
Run Battery Detection
No
Battery Detected ?
Yes
Figure 15. Battery Charging Flow Diagram
20
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