BQ24751RHDRG4 Datasheet, PDF (14/38 Pages) Texas Instruments – Host-controlled Multi-chemistry Battery Charger

bq24751
SLUS734D – DECEMBER 2006 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
CHARGE CURRENT REGULATION
vs
BAT VOLTAGE
5
V_in = 20 V,
4
Ichrg_set = 4 A,
T_A = 20°C
4 Cell
3
2
1
0
0
2
4
6
8
10 12 14 16 18
Battery Voltage - V
Figure 15.
BATTERY REMOVAL
EFFICIENCY
vs
BATTERY CHARGE CURRENT
100 _{V(BAT) = 16.8 V}
90
V_reg = 12.6 V
V_reg = 8.4 V
80
70
0
2000
4000
6000
8000
Battery Charge Current - mA
Figure 16.
ACDRV AND BATDRV STARTUP
V_ACDET
V_BATDRV
Figure 17.
REF AND REGN STARTUP
V_ACDRV
V_ACGOOD
t − Time = 100 ms/div
Figure 18.
SYSTEM SELECTOR ON ADAPTER INSERTION WITH
390 µF SYS-TO-PGND SYSTEM CAPACITOR
VBAT
VSYS
VACDRV
VBATDRV
Figure 19.
t − Time = 400 ms/div
Figure 20.
14
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