Datasheet

Charge Compensation
The bq2050 applies the following temperature compen
-
sation to NAC during charge:
This compensation applies to both types of Li-Ion cells.
Self-Discharge Compensation
The self-discharge compensation is programmed for a
nominal rate of
1
512
*
NAC per day. This is the rate for a
battery within the 20°C–30°C temperature range. This
rate varies across 8 ranges from < 10°C to > 70°C, chang
-
ing with each higher temperature (approximately 10°C).
See Table 5 below:
Self-discharge may be disabled by connecting PROG
5
=H.
Digital Magnitude Filter
The bq2050 has a digital filter to eliminate charge and dis
-
charge counting below a set threshold. The bq2050 setting
is 200
µ
V for V
SRD
and 210µV for V
SRQ
.
8
bq2050
Temperature Range
Typical Rate
PROG
5
= Z or L
< 10°C
NAC
2048
10–20°C
NAC
1024
20–30°C
NAC
512
30–40°C
NAC
256
40–50°C
NAC
128
50–60°C
NAC
64
60–70°C
NAC
32
> 70°C
NAC
16
Table 5. Self-Discharge Compensation
Approximate
Discharge Rate
Discharge
Compensation
Factor Efficiency
<
0.5C 1.00 100%
≥
0.5C 1.05 95%
Table 3A. Graphite Anode
Temperature
Temperature
Compensation
Factor Efficiency
≥
10°C 1.00 100%
0°C to 10°C 1.10 90%
-10°C to 0°C 1.35 74%
≤
-10°C 2.50 40%
Table 3B. Graphite Anode
Approximate
Discharge Rate
Discharge
Compensation
Factor Efficiency
<
0.5C 1.00 100%
≥
0.5C 1.15 86%
Table 4A. Coke Anode
Temperature
Temperature
Compensation
Factor Efficiency
≥
10°C 1.00 100%
0°C to 10°C 1.25 80%
-10°C to 0°C 2.00 50%
≤
-10°C 8.00 12%
Table 4B. Coke Anode
Temperature
Temperature
Compensation
Factor Efficiency
<
10°C 0.95 95%
≥
10°C 1.00 100%