BQ24618_15 Datasheet, PDF (27/43 Pages) Texas Instruments – System Power Selector and Low

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9 Application and Implementation
bq24618
SLUSA55B – OCTOBER 2010 – REVISED APRIL 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The bq24618 battery charger is ideal for high current charging (up to 10 A) and can charge battery packs
consisting of single cells or multiple cells in series. The bq24610EVM evaluation module is a complete charge
module for evaluating the bq2461x. The application curves were taken using the bq24610EVM. Refer to the EVM
user's guide (SLUU396) for EVM information.
9.2 Typical Application
ADAPTER+
ADAPTER-
Q1 (ACFET)
SI7617DN
P
R20
2Ω R14
100 kW _C14
C16
0.1 mF
2.2μF
VREF
P
RAC
0.010 W
Q2 (ACFET)
SI7616DN
C2
0.1 µF
C3
0.1 µF
R3
100 kW
R5
100 kW
R7
100 kW
R18
1 kΩ
R4
32.4 kW
R6
10 kW
R8
22.1 kW
C4
1 µF
R11 10 kW
D2
ADAPTER +
Pack
Thermistor
Sense
103AT
VREF
R9
9.31 kW
R10
430 kW
R12 10 kW
R13 10 kW
R16
100 W
D3
D4
C1
0.1 μF
R17
10Ω
ACN
VCC
ACP
ACDRV
BATDRV
ISET1
ISET2
HIDRV
PH
BTST
ACSET
REGN
VREF
CE
bq24618
LODRV
GND
STAT1
SRP
STAT2
SRN
PG
VFB
TTC
TS
PwrPad
C8
10 µF
C7
1µF
R19
1 kΩ
C6
D1 0.1 µF
BAT54
C5
1 µF
C9
10 μF
SYSTEM
C15
0.1 µF
R15
100 kW
P
Q4
SIS412DN
L1
6.8 µH*
RSR
0.010 W
Q3 (BATFET)
SI7617DN
VBAT
PACK+
PACK-
Q5
SIS412DN
C10
0.1 µF
C12 C13
10 µF* 10 µF*
C11
0.1 µF
R2
500 kΩ
Cff
22 pF
R1
100 kW
C TTC
0.056 μF
VIN = 19 V, 3-cell, I_{adapter_limit} = 4 A, I_charge = 3 A, I_pre-charge = I_term = 0.3 A, 5-hour safety timer
Figure 19. Typical System Schematic
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