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bq24020, bq24022,
bq24023, bq24024
bq24025, bq24026
SLUS549C − DECEMBER 2002 − REVISED AUGUST 2004
TYPICAL CHARACTERISTICS
AC DROPOUT VOLTAGE
vs
450
400
350
Dropout Voltage − mV
300
250
200
150
IO(OUT) = 250 mA
100
50
0
0
100
50
TJ − Junction Temperature −
_C
150
IO(OUT) = 500 mA
IO(OUT) = 750 mA
JUNCTION TEMPERATURE
IO(OUT) = 1000 mA
Figure 1
The bqTINYII supports a precision Li-Ion, Li-Pol charging system suitable for single-cells. Figure 3 shows a typical charge
profile, application circuit and Figure 4 shows an operational flow chart.
Regulation
Voltage
Regulation
Current
Pre-Conditioning
Phase
Current Regulation
Phase
Voltage Regulation
and Charge Termination Phase
Minimum
Charge
Voltage
Charge
Voltage
Charge
Complete
Pre-Conditioning
and Taper Detect
Charge
Current
t(PRECHG)
t(CHG)
t(TAPER)
Figure 2. Typical Charging Profile
9
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