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| BQ24232HA Datasheet, PDF (19/36 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger | |||
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www.ti.com
bq24232HA
SLUSCG4 â MAY 2016
RHOT and RCOLD are the thermistor resistance at the desired hot and cold temperatures, respectively. Note
that the temperature window cannot be tightened more using the thermistor connected to TS, it can only be
extended.
INTC
bq24232HA
TS
+
VCOLD
+ VHOT
RS
PACK+
TEMP
RP
PACK-
Figure 13. Extended TS Temperature Thresholds
7.4 Device Functional Modes
7.4.1 Battery Charging
Set CE low to initiate battery charging. First, the device checks for a short circuit on the BAT pin by sourcing
IBAT(SC) to the battery and monitoring the voltage. When the BAT voltage exceeds VBAT(SC), the battery charging
continues. The battery is charged in three phases: conditioning precharge, constant-current fast charge (current
regulation), and a constant-voltage tapering (voltage regulation). In all charge phases, an internal control loop
monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is
exceeded.
Figure 14 illustrates a normal Li-ion charge cycle using the bq24232HA:
PRECHARGE
CC FAST CHARGE
CV TAPER
DONE
VBAT(REG)
IO(CHG)
Battery Current
VLOWV
I(PRECHG)
I(TERM)
Battery Voltage
CHG = Hi-z
Figure 14. Normal Li-Ion Charge Cycle
Copyright © 2016, Texas Instruments Incorporated
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