Datasheet

VCC
BATDRV
REGN
BTST
HIDRV
PHASE
LODRV
GND
SRP
SRN
Q4
Sis412DN
L1
4.7µH
SYSTEM
C10
10µF
RSR
10m?
R1
430 kW
R2
66.5 kW
C2
0.1µF
U1
bq24725A
C8
10uF
Q3
Sis412DN
Q5 (BATFET)
FDS6680A
C7
0.047µF
Adapter +
RAC 10 mW
Pack +
C6
1µF
HOST
Dig I/O
SMBus
+3.3V
C4
100 pF
R4
R5
R7
549 kW
ACN
ACP
CMSRC
ACDRV
ACDET
ILIM
SDA
SCL
ACOK
IOUT
Ci
2.2µF
Ri
2 ?
R9
10 Ω
R3
10 kW
R8
100 kW
R10
4.02 kW
R11
D1
BAT54
C9
10uF
C11
10µF
Pack -
C3
0.1µF
C5
1µF
R6
4.02 kW
C1
0.1µF
Total
Csys
220µF
C15
0.01µF
C16
0.1µF
C17
2200 pF
Adapter -
ADC
Q1 (ACFET)
FDS6680A
D3
PDS1040
PowerPad
C13
0.1µF
C14
0.1µF
R14
10 Ω
R15
7.5 Ω
*
*
4.02 kW
10 kW
10 kW
*
*
*
bq24725A
www.ti.com SLUSAL0 –SEPTEMBER 2011
F
s
= 750kHz, I
ADPT
= 2.816A, I
CHRG
= 1.984A, I
LIM
= 2.54A, V
CHRG
= 12.592V, 65W adapter and 3S2P battery pack
Use 0Ω for better current sensing accuracy, use 10Ω/7.5Ω resistor for reversely battery connection protection. See
application information about negative output voltage protection for hard shorts on battery to ground or battery
reversely connection.
The total Csys is the lump sum of system capacitance. It is not required by charger IC. Use Ri and Ci for adapter hot
plug in voltage spike damping. See application information about input filter design.
Figure 2. Typical System Schematic with One NMOS Selector and Schottky Diode
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