BQ24020 Datasheet, PDF (9/20 Pages) Texas Instruments – SINGLE-CHIP,LI-ION AND LI-POL CHARGER IC WITH AUTONOMOUS USB-PORT AND AC-ADAPTER SUPPLY MANAGEMENT

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bq24020, bq24022, bq24023
bq24024, bq24025, bq24026
bq24027
SLUS549D – DECEMBER 2002 – REVISED MARCH 2006
TYPICAL CHARACTERISTICS
AC DROPOUT VOLTAGE
vs
JUNCTION TEMPERATURE
450
I_O(OUT) = 1000 mA
400
350
I_O(OUT) = 750 mA
300
250
I_O(OUT) = 500 mA
200
150
I_O(OUT) = 250 mA
100
50
0
0
50
100
150
T_J − Junction Temperature − _C
Figure 1.
The bqTINY-II supports a precision Li-Ion, Li-pol charging system suitable for single-cell packs. Figure 3 shows
a typical charge profile, application circuit and Figure 4 shows an operational flow chart.
Regulation ^{Pre-Conditioning}
Voltage
Phase
Regulation
Current
Current Regulation
Phase
Voltage Regulation
and Charge Termination Phase
Minimum
Charge
Voltage
Pre-Conditioning
and Taper Detect
Charge
Voltage
Charge
Current
t_(PRECHG)
t_(CHG)
Figure 2. Typical Charging Profile
Charge
Complete
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