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bq24020, bq24022,
bq24023, bq24024
bq24025, bq24026
SLUS549C − DECEMBER 2002 − REVISED AUGUST 2004
TERMINAL FUNCTIONS
TERMINAL
NAME
AC
CE
ISET1
ISET2
OUT
PG
STAT1
STAT2
TE
TS
TTE
USB
VSS
Exposed
Thermal
Pad
bq24020
bq24025 bq24022 bq24023 bq24024 bq24026
1
8
6
7
10
−
3
4
−
9
−
2
5
1
9
6
7
10
8
3
4
−
−
−
2
5
1
8
6
7
10
−
3
4
−
−
9
2
5
1
−
6
7
10
−
3
4
−
9
8
2
5
1
−
6
7
10
−
3
4
8
9
−
2
5
I/O
I
I
I
I
O
O
O
O
I
I
I
I
−
AC charge input voltage
Charge enable input (active low)
Charge current set point for AC input and precharge and taper set
point for both AC and USB
Charge current set point for USB port (high=500 mA, Low=100
mA, hi-z=disable USB charge)
Charge current output
Powergood status output (active low)
Charge status output 1 (open-drain)
Charge status output 2 (open-drain)
Timer enable input (active low)
Temperature sense input
Timer and termination enable input (active low)
USB charge input voltage
Ground input
There is an internal electrical connection between the exposed
thermal pad and VSS pin of the device. The exposed thermal pad
must be connected to the same potential as the Vss pin on the
printed circuit board.
Do not use the thermal pad as the primary
ground input for the device.
VSS pin must be connected to
ground at all times
DESCRIPTION
pad
pad
pad
pad
pad
−
7
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