BQ24618 Datasheet, PDF (3/36 Pages) Texas Instruments – Stand-Alone USB-Friendly Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger

bq24618
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TYPICAL APPLICATION
ADAPTER+
ADAPTER-
D5
R20
2Ω
C16
2.2μF
R14
100 kW
C14
0.1 mF
VREF
P
RAC
0.02 W
Q2 (ACFET)
SI4421
C2
0.1 µF
C3
0.1 µF
R3
100 kW
R5
100 kW
R7
232 kW
R18
1 kΩ
R4
32.4 kW
R6
10 kW
R8
32.4 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
1Ω
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
SLUSA55 – OCTOBER 2010
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
CDS17317
L1
6.8 µH*
RSR
0.010 W
Q3 (BATFET)
Si4421
VBAT
PACK+
PACK-
Q5
CDS17317
C10
0.1 µF
C12 C13
10 µF* 10 µF*
C11
0.1 µF
R2
100 kΩ
Cff
22 pF
R1
100 kW
C TTC
0.033 μF
A. VIN=5V, 1-cell, I_{adapter_limit}=2A, I_charge=2A, I_pre-charge= I_term=0.3A, 3hour safety timer
Figure 2. Typical System Schematic
PART NUMBER
bq24618
IC MARKING
QWG
ORDERING INFORMATION
PACKAGE
ORDERING NUMBER
(Tape and Reel)
24-PIN 4×4 mm² QFN
bq24618RGER
bq24618RGET
QUANTITY
3000
250
THERMAL INFORMATION
THERMAL METRIC⁽¹⁾
bq24618
RGE
UNITS
24 PINS
q_JA
Junction-to-ambient thermal resistance
y_JT
Junction-to-top characterization parameter
y_JB
Junction-to-board characterization parameter
43
0.6
°C/W
19
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
Copyright © 2010, Texas Instruments Incorporated
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