BQ24742 Datasheet, PDF (11/35 Pages) Texas Instruments – Li-Ion or Li-Polymer Battery Charger with Low Iq and Accurate Trickle Charge

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VREF LOAD AND LINE REGULATION
vs
Load Current
0.50
0.40
0.30
0.20
PVCC = 10 V
0.10
0
-0.10
PVCC = 20 V
-0.20
0
10
20
30
40
50
VREF - Load Current - mA
Figure 3.
BAT VOLTAGE
vs
VADJ/VDAC RATIO
13.6
13.4
3-Cell
13.2
13
12.8
12.6
12.4
12.2
12
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
VADJ/VDAC Ratio
Figure 5.
CHARGE CURRENT
vs
ISET/VDAC
5
4.5
3-Cell
4
3.5
3
2.5
2
1.5
1
0.5
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
ACSET/VDAC Ratio
Figure 7.
bq24741, bq24742
SLUS875B – MARCH 2009 – REVISED OCTOBER 2009
REGN LOAD AND LINE REGULATION
vs
LOAD CURRENT
0
-0.50
-1
-1.50
-2
PVCC = 10 V
-2.50
PVCC = 20 V
-3
0
10 20 30 40 50 60 70
80
REGN - Load Current - mA
Figure 4.
BAT VOLTAGE REGULATION ACCURACY
vs
SETPOINT
0.06
0.05
0.04
0.03
0.02
0.01
0
-0.01
-0.02
12 12.2 12.4 12.6 12.8 13 13.2 13.4 13.6
VBAT_reg Setpoint (V)
Figure 6.
CHARGE CURRENT REGULATION ACCURACY
vs
V(CSP-CSN) SETPOINT
25
20
15
10
5
0
0 10 20 30 40 50 60 70 80 90 100
ICHG_reg Setpoint (mV)
Figure 8.
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