BQ24704 Datasheet, PDF (11/31 Pages) Texas Instruments – Low Cost, Host-Controlled Li-Ion and Li-Polymer Battery Charger With Low Iq

bq24704
www.ti.com........................................................................................................................................................................................................ SLUS838 – MAY 2009
INPUT CURRENT REGULATION (DPM) ACCURACY
10
9
ACSET Varied
8
7
6
4-Cell, VBAT = 16 V
5
4
3
2
1
0
-1
-2
0
1
2
3
4
5
6
Input Current Regulation Setpoint - A
Figure 11.
INPUT REGULATION CURRENT (DPM), AND CHARGE
CURRENT
vs
SYSTEM CURRENT
5
V_I = 20 V,
4-Cell,
4 ^Vbat ^{= 16 V}
Input Current
3
System Current
2
Charge Current
1
0
0
1
2
3
4
System Current - A
Figure 13.
CHARGE CURRENT REGULATION
vs
BAT VOLTAGE
5
4
3
2
1
Ichrg_set = 4 A
0
0
2
4
6
8
10
12
14 16
18
Battery Voltage - V
Figure 15.
V_IADAPT INPUT CURRENT SENSE AMPLIFIER ACCURACY
5
0
-5
-10
V_I = 20 V, CHG = DIS
V_I = 20 V, CHG = EN
-15
-20
-25
0
V_ACP-ACN < 1.5 x I_ADAPTER x R_AC
I_ADAPTER Amplifier Gain
12
3
4
5
6
7
8
9 10
I_(ACPWR) - A
Figure 12.
TRANSIENT SYSTEM LOAD (DPM) RESPONSE
Isys
I_IN
Ibat
100
Time = 200 μs/div
Figure 14.
EFFICIENCY
vs
BATTERY CHARGE CURRENT
90
VI = 21 V
V(BAT) = 16.8 V
VI = 20 V
V(BAT) = 12.6 V
VI = 20 V
V(BAT) = 8.4 V
80
TA =20^oC
70
0
2000
4000
6000
Battery Charge Current - mA
Figure 16.
8000
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