Datasheet

VC2
7.6 V
6 V
100%
79%
8.4 V
111%
VC2
VC1
VC1_CB
CD GND
OUT
VDD
CB_EN
3
4
7
6
5
C
VD
8
2
1
C
CD
C
IN
C
IN
R
IN
R
IN
R
VD
CELL2
CELL1
R
CB
VC2
VC1
VC1_CB
CD GND
OUT
VDD
CB_EN3
4
7
6
5
C
VD
8
2
1
C
CD
C
IN
C
IN
R
IN
R
IN
R
VD
CELL2
CELL1
Q2
R
CB_EXT
R
CLAMP
Q1
bq29200
bq29209
SLUSA52A –SEPTEMBER 2010–REVISED NOVEMBER 2010 www.ti.com
Figure 7. V
MM_DET_ON
and V
MM_DET_OFF
Threshold
BATTERY CONNECTION
Figure 8 shows the configuration for the 2-series cell battery connection.
Figure 8. 2-Series Cell Configuration
EXTERNAL CELL BALANCING
Higher cell balancing currents can be supported by means of a simple external network, as shown in Figure 9.
Figure 9. External Cell Balancing Configuration
R
CLAMP
ensures that both Q1 and Q2 remain off when balancing is disabled, and should be sized above 2 kΩ to
prevent excessive internal device current when the balancing network is activated. R
CB_EXT
determines the value
of the balancing current, and is dependent on the voltage of the balanced cell, as follows:
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