BQ24230 Datasheet, PDF (19/33 Pages) Texas Instruments – USB-FRIENDLY LITHIUM-ION BATTERY CHARGER AND POWER-PATH MANAGEMENT IC

bq24230
bq24232
www.ti.com .......................................................................................................................................... SLUS821A – OCTOBER 2008 – REVISED DECEMBER 2008
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
BATTFET Off
Wait for V _BAT< VRCH
No
VBAT < VRCH
Yes
Run Battery Detection
No
Battery Detected ?
Yes
TD = Low
(’72, ’73 Only)
No
(’74, _{’75 = YES)}
Figure 29. Battery Charging Flow Diagram
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
Copyright © 2008, Texas Instruments Incorporated
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