BQ24735 Datasheet, PDF (4/42 Pages) Texas Instruments – 1-4 Cell Li+ Battery SMBus Charge Controller for Supporting Turbo Boost Mode with N-Channel Power MOSFET Selector

bq24735
SLUSAK9 – SEPTEMBER 2011
www.ti.com
Adapter +
Adapter -
Din _*
BAT54A
Q1 (ACFET)
FDS6680A
C17
2200pF
C16
0.047µF
Q2 (RBFET)
FDS6680A ^{RAC 10 mW}
C1
0.1 µF
C3
0.1µF
R10
4.02 kW
R11
4.02 kW
C2
0.1µF
ACN
ACP
VCC
BATDRV
R1
430 kW
R2
487 kW
+3.3V
HOST SMBus
Dig I/O
CMSRC
REGN
ACDRV
ACDET
BTST
R8
100 kW
ILIM
R7
549 kW
HIDRV
U1
bq24735 ^PHASE
R3
R4
10 kW 10 kW
R5
10 kW
SDA
LODRV
GND
SCL
ACOK
SRP
ADC
C4
100 pF
IOUT
PowerPad ^SRN
R9
4.7 W
C5
1µF
C6
1µF
D1
BAT54
C7
0.047µF
R6
4.02 kW
R12
100 kW
Total
Csys *
220 µF
Q5 (BATFET)
Si4435DDY
D2
SL42
SYSTEM
C8
10uF
Q3
Sis412DN
C9
10uF
RSR
10 mW
L1
4.7µH
Q4
Sis412DN
C10 C11
10 µF 10 µF
Pack +
Pack -
R14 _*
10 W
R15 _*
7.5 W
C13
0.1µF
C14
0.1µF
F_s = 750kHz, I_ADPT = 2.048A, I_CHRG = 1.984A, I_LIM = 2.54A, V_CHRG = 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
PART NUMBER
bq24735
ORDERING INFORMATION⁽¹⁾
IC MARKING
PACKAGE
ORDERING NUMBER
(Tape and Reel)
BQ735
20-PIN 3.5 x 3.5mm² QFN
bq24735RGRR
bq24735RGRT
QUANTITY
3000
250
(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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