bq24735
SLUSAK9 –SEPTEMBER 2011
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Q1 (ACFET)
FDS6680A
Q2 (RBFET)
FDS6680A
RAC 10 mW
Adapter +
SYSTEM
C17
2200pF
C16
0.047µF
Total
Csys
R9
4.7W
*
C1
0.1 µF
C3
0.1µF
µF
220
Adapter -
C5
1µF
Q5 (BATFET)
Si4435DDY
Din
BAT54A
*
ACN
VCC
R6
C2
0.1µF
4.02 kW
R10
4.02 kW
R11
4.02 kW
BATDRV
D2
SL42
ACP
R12
100 kW
C6
1µF
CMSRC
ACDRV
ACDET
REGN
BTST
D1
BAT54
R1
430 kW
C9
10uF
C8
10uF
R2
487 kW
Q3
Sis412DN
HIDRV
PHASE
R8
100 kW
RSR
10 mW
C7
0.047µF
ILIM
U1
bq24735
R7
549
kW
Pack +
L1
4.7µH
Q4
Sis412DN
+3.3V
C10 C11
µF 10µF
10
R3 R4
10 kW 10 kW
R5
10 kW
LODRV
GND
Pack -
SDA
HOST SMBus
SCL
SRP
SRN
Dig I/O
ADC
R14
*
ACOK
IOUT
C13
0.1µF
10 W
PowerPad
C14
0.1µF
R15
7.5 W
C4
100 pF
*
Fs = 750kHz, IADPT = 2.048A, ICHRG = 1.984A, ILIM = 2.54A, VCHRG = 4.200V, 12W adapter and 1S2P battery pack
Use 0Ω for better current sensing accuracy, use 10Ω/7.5Ω resistor for reversed battery connection protection. See
application information about negative output voltage protection for hard shorts on battery to ground or battery
reversed connection.
The total Csys is the total lump sum of system capacitance. It is not required by charger IC. Use Din for reverse input
voltage protection. See application information about reverse input voltage protection.
Figure 3. Typical System Schematic for 5V Input 1S Battery
ORDERING INFORMATION(1)
ORDERING NUMBER
PART NUMBER
bq24735
IC MARKING
PACKAGE
QUANTITY
(Tape and Reel)
bq24735RGRR
bq24735RGRT
3000
250
BQ735
20-PIN 3.5 x 3.5mm2 QFN
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document; or, see the TI
web site at www.ti.com.
4
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