BQ24747 Datasheet, PDF (12/36 Pages) Texas Instruments – SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator and Charge Enable Pin

bq24747
SLUS988 – OCTOBER 2009 ............................................................................................................................................................................................. www.ti.com
TYPICAL CHARACTERISTICS (continued)
INPUT CURRENT REGULATION (DPM) & CHARGE CURRENT
vs
SYSTEM CURRENT
6
5
DCIN = 20 V
5
4.5
4
Input Current
4
3
3.5
2
Charge Current
1
3
INPUT CURRENT REGULATION (DPM) TRANSIENT
SYSTEM LOAD RESPONSE CCM TO CCM
I_(DCIN)
I_LOAD
I_(SYS)
0
2.5
0
0.5
1
1.5
2
2.5
3
3.5
4
System Current - A
Figure 12.
VICM
t − Time = 1 ms/div
Figure 13.
INPUT CURRENT REGULATION (DPM) TRANSIENT
SYSTEM LOAD RESPONSE CCM TO DCM
I_(DCIN)
I_LOAD
CHARGE CURRENT REGULATION ACCURACY
VFB (BATTERY) VOLTAGE
0.5
0
-0.5
-1
I_(SYS)
VICM
t − Time = 1 ms/div
Figure 14.
-1.5
-2
3-Cell at 12.592 V,
ICHG at 4.096A
-2.5
with DCIN = 20 V
-3
4
5
6
7
8
9
10 11 12 13
Battery Voltage - V
Figure 15.
EFFICIENCY
BATTERY CHARGE CURRENT
98
4-Cell
96
94
3-Cell
92
2-Cell
90
88
1-Cell
86
1 - 4 Cell
84
ICHG at 8.064A
with DCIN = 20 V
82
80
0
1
2
3
4
5
6
7
8
9
Battery Charge Current - A
Figure 16.
BATTERY REMOVAL (From Constant Current Mode)
VFB
PH
I(IND)
t − Time = 4 ms/div
Figure 17.
12
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