BQ24735_17 Datasheet, PDF (34/46 Pages) Texas Instruments – 1- to 4-Cell Li+ Battery SMBus Charge Controller for Supporting Turbo Boost Mode With N-Channel Power MOSFET Selector

bq24735
SLUSAK9B – SEPTEMBER 2011 – REVISED APRIL 2015
System Examples (continued)
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Adapter +
Adapter -
Din _*
BAT54A
Q1 (ACFET)
FDS6680A
C17
2200p F
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
bq247 35 ^PHASE
R3
R4
10 kW 10 kW
R5
10 kW
SDA
LODRV
GND
SCL
ACOK
SRP
ADC
IOUT PowerPad ^SRN
C4
100 pF
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 = 750 kHz, I_ADPT = 2.048 A, I_CHRG = 1.984 A, I_LIM = 2.54 A, V_CHRG = 4.200 V, 12-W adapter and 1S2P battery
pack
Use 0 Ω for better current-sensing accuracy, use 10-Ω or 7.5-Ω resistor for reversed battery connection protection.
See Negative Output Voltage Protection.
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 Input Filter Design.
Figure 22. Typical System Schematic for 5-V Input 1-S Battery
34
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