BQ24232H_15 Datasheet, PDF (18/42 Pages) Texas Instruments – bq2423xx USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC

bq24230H, bq24232H
SLUSBI8A – JANUARY 2014 – REVISED DECEMBER 2014
www.ti.com
The charge current limit is adjustable from 25 mA to 500 mA. The valid resistor range is 1.74 kΩ to 34.8 kΩ. If
I_CHG is programmed as greater than the input current limit, the battery does not charge at the rate of I_CHG, but at
the slower rate of I_IN(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
Start Fastcharge
ICHARGE
set by ISET
No
tPRECHARGE
Elapsed ?
Yes
End Charge
Flash/CHG
No
I _BAT< ITERM
Yes
Charge Done
CHG = Hi-Z
No
tFASTCHARGE
Elapsed ?
Yes
End Charge
Flash CHG
Yes
Termination Reached
BATTFET Off
Wait for V _BAT< VRCH
No
VBAT < VRCH
Yes
Run Battery Detection
No
Battery Detected ?
Yes
TD = Low
(‘230H Only)
No
(’232H = Yes)
Yes
Figure 15. Battery Charging Flow Diagram
9.3.4.1 Charge Current Translator
When the charger is enabled, internal circuits generate a current proportional to the charge current at the ISET
input. The current out of ISET is 1/400 (±10%) of the charge current. This current, when applied to the external
charge current programming resistor, R_ISET, generates an analog voltage that can be monitored by an external
host to calculate the current sourced from BAT.
V_ISET=(I_CHARGE / 400)×R_ISET
(3)
18
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