BQ24704 Datasheet, PDF (10/31 Pages) Texas Instruments – Low Cost, Host-Controlled Li-Ion and Li-Polymer Battery Charger With Low Iq

bq24704
SLUS838 – MAY 2009........................................................................................................................................................................................................ www.ti.com
BAT VOLTAGE
vs
VADJ/VREF RATIO
18.2
18
17.8
17.6
17.4
VADJ = 0 -V_REF,
4-Cell,
No Load
17.2
17
16.8
16.6
16.4
16.2
16
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
VADJ/V_REF Ratio
Figure 5.
INPUT CURRENT
vs
ACSET/VREF RATIO
13
12
11
10
ACSET Varied,
9 4-Cell,
Vbat = 16 V
8
7
6
5
4
3
2
1
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
ACSET/V_REF Ratio
Figure 7.
BAT VOLTAGE REGULATION ACCURACY
0.10
0.08
VADJ = 0 -V_REF
0.06
0.04
4-Cell, no load
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
16.5
17
17.5
18
18.5
19
V_(BAT) - Setpoint - V
Figure 9.
CHARGE CURRENT
vs
SRSET/VREF RATIO
10
9 SRSET Varied,
4-Cell,
8 Vbat = 16 V
7
6
5
4
3
2
1
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
SRSET/V_REF Ratio
Figure 6.
BAT VOLTAGE REGULATION ACCURACY
vs
CHARGE CURRENT
0.2
V_reg = 16.8 V
0.1
0
-0.1
-0.2
0
2000
4000
Charge Current - mA
6000
8000
Figure 8.
CHARGE CURRENT REGULATION ACCURACY
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
0
4-Cell, VBAT = 16 V
SRSET Varied
2
4
6
8
I_(CHRG) - Setpoint - A
Figure 10.
10
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