BQ24618 Datasheet, PDF (2/36 Pages) Texas Instruments – Stand-Alone USB-Friendly Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger

bq24618
SLUSA55 – OCTOBER 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DESCRIPTION (CONTINUED)
The bq24618 controls external switches to prevent battery discharge back to the input, connect the adapter to
the system, and to connect the battery to the system using 6-V gate drives for better system efficiency. The
bq24618 features Dynamic Power Management (DPM). These features reduce battery charge current when the
input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger
simultaneously. A highly-accurate current-sense amplifier enables precise measurement of input current from the
AC adapter to monitor the overall system power.
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
STAT2
SRP
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=19V, 3-cell, I_{adapter_limit}=4A, I_charge=3A, I_pre-charge= I_term=0.3A, 5 hour safety timer
Figure 1. Typical System Schematic
2
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