Datasheet

VC1
CB1
CB
I
R
=
(VC2 VC1)
CB2
+ )
VD
CB
I
(R R
-
=
Temperature (°C)
I
CD
Charge Current (nA)
I
CD
CHARGE CURRENT
vs
TEMPERATURE
-40 -20 0 20 40 60 80 100
-180
-170
-160
-150
-140
-130
-120
-110
-100
-90
-80
G001
Temperature (°C)
I
CD
Discharge Current (µA)
I
CD
DISCHARGE CURRENT
vs
TEMPERATURE
40
45
50
55
60
65
70
75
80
-40 -20 0 20 40 60 80 100
G002
bq29200
bq29209
www.ti.com SLUSA52A –SEPTEMBER 2010–REVISED NOVEMBER 2010
RECOMMENDED CELL BALANCING CONFIGURATIONS
Typical values stated where T
A
= 25°C and (VC2–VC1), (VC1–GND) = 3.8 V. Min/Max values stated where T
A
= –40°C to
110°C, VDD = 4 V to 10 V, and (VC2–VC1), (VC1–GND) = 3.0 V to 4.2 V. All values assume recommended supply voltage
filter resistance R
VD
of 100 Ω and 5% accurate or better cell balance resistor R
CB
.
PARAMETER TEST CONDITION MIN NOM MAX UNIT
R
CB
= 4700 Ω 0.5 0.75 1
R
CB
= 2200 Ω 1 1.5 2
R
CB
= 910 Ω 2 3 4
I
CB
Cell balance input current R
CB
= 560 Ω 3 4.5 6 mA
R
CB
= 360 Ω 3.5 6 8.5
R
CB
= 240 Ω 4 7.5 11
R
CB
= 120 Ω 5 10 15
The cell balancing current may be calculated as follows:
Cell 1 (VC1–GND):
Cell 2 (VC2–VC1):
TYPICAL CHARACTERISTICS
Figure 2. I
CD
Charge Current Figure 3. I
CD
Discharge Current
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