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BQ24747 Datasheet, PDF (3/36 Pages) Texas Instruments – SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator and Charge Enable Pin
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bq24747
www.ti.com ............................................................................................................................................................................................. SLUS988 – OCTOBER 2009
VIN = 20 V, VBAT = 4-cell Li-Ion, ICHARGE = 4.5 A, VICMer_limit = 6 A, for ICOUT Input Current comparator.
ADAPTER +
R10
2
ADAPTER -
C1
2.2 uF
R1
309k
1%
R10
10
P
Q1 (ACFET)
SI4835BDY
P
Q2 (DFET)
SI4835BDY
Controlled by
HOST
C4
C3
0.1uF
0.1uF
RAC
0.010
C5 0.1uF
27 CSSN
28 CSSP
22 DCIN
C9
2x10uF
Controlled by
HOST
Q5
(BATFET)
SI4835BDY
R2
49.9k
1%
+3 .3V _ALWAYS
OR
+5V_ALWAYS
DISCRETE
LOGIC
R3
10k
R14
R4 R5
10k 10k 10k
2 ACIN
12 GND
11 VDDSMB
C6 1uF
13 ACOK
3 VREF
C7 1uF
UGATE 24
bq24747 PHASE 23
BOOT 25
D1
VDDP 21
C11
C10
0.1uF
BAT54
1uF
LGATE 20
PGND 19
Q3
FDS6680A
L1
5.6uH
C12
0.1uF
Q4
FDS6680A
RSR
0.010
C14
3x10uF
C13
0.1uF
26 ICOUT
CSOP 18
HOST
(EC)
Dig I/O
SMBus
DISCRETE
LOGIC
R6
10k
C8 100pF
7 CE
9 SDA
10 SCL
8 VICM
14 NC
16 NC
R13
1400K
Pull-up rail could be either VREF or other system rail.
CSON 17
VFB 15
ICREF 1
EAO 4
EAI 5
FBO 6
R11
100
VREF
R11
51.1k
C15
0.1u
1%
R12
17.4k
1% R7
R8
7.5k
4.7k
C16
51pF
C18
130pF
C17
2000pF
R9
200k
Figure 2. Typical System Schematic, Using Internal Input Current Comparator
CHRG_IN
PACK+
PACK-
PART NUMBER
bq24747
ORDERING INFORMATION(1)
PACKAGE
ORDERING NUMBER
(Tape and Reel)
28-PIN 5 x 5 mm2 QFN
bq24747RHDR
bq24747RHDT
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.
PACKAGE THERMAL DATA
PACKAGE
QFN – RHD(1)
θJA
39°C/W
TA = 70°C
POWER RATING
2.36 W
DERATING FACTOR
ABOVE TA = 25°C
0.028 W/°C
(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.
Copyright © 2009, Texas Instruments Incorporated
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