BQ24740_14 Datasheet, PDF (3/33 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger

bq24740
www.ti.com............................................................................................................................................... SLUS736C – DECEMBER 2006 – REVISED MARCH 2009
ADAPTER+
ADAPTER-
R 10
2Ω
C1
2.2 µF
P
Q 1 ( ACFET )
SI 4435
P
Q 2 (ACFET)
SI4435
Controlled by
HOST
R1
432 k Ω
1%
C2
0.1 µF
R AC
0 .010 Ω
C3
0.1 µF
EXTPWR
R2
66 .5 k Ω
1%
VREF
R 11
100 kΩ
R 12
66.5 k Ω
R4
10 k Ω
VREF
R3
10 k Ω
R 13
100 kΩ
R 14
43 k Ω
R5
C4
10 kΩ
1 µF
GPIO
HOST
ADC
VREF
REGN
C5
100 pF
D2
BAT54
C6
C7
10 µ F 10 µ F
ACN
ACP
ACDET
AGND
EXTPWR
SRSET
ACSET
VREF
IADSLP
DPMDET
LPMD
CELLS
CHGEN
VDAC
VADJ
IADAPT
PVCC
HIDRV
PH
bq24740
BTST
REGN
LODRV
PGND
SRP
SRN
BAT
LPREF
ISYNSET
PowerPad
C8
0.1µF
Q 3 (BATFET )
SI 4435
Controlled by
HOST
P
Q4
FDS 6680 A
C9
D 1 BAT 54 ^{0.1 µ F}
R _SR
L1
0 .010 Ω
8.2 µH
C 11
10 µF
C 10
1 µF
C 13
0 .1 µF
C 14
0 .1 µF
Q5
FDS 6680 A
R6
24 k Ω
VREF
R7
200 k Ω
R8
24.9 k Ω
C 15
0.1 µF
C 12
10 µF
R9
1.8 MΩ
( 1 ) Pull- up rail could be either VREF or other system rail.
( 2 ) SRSET / ACSET could come from either DAC or resistor dividers.
A. V_IN = 20 V, V_BAT = 3-cell Li-Ion, I_CHARGE = 3 A, I_{ADAPTER_LIMIT} = 4 A
Figure 2. Typical System Schematic, Voltage and Current Programmed by Resistor
SYSTEM
PACK+
PACK-
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