BQ24745_14 Datasheet, PDF (3/39 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery

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bq24745
SLUS761D – DECEMBER 2007 – REVISED OCTOBER 2011
V_IN = 20 V, V_BAT = 4-cell Li-Ion, I_CHARGE = 4.5 A, VICM_{er_limit} = 6 A, for ICOUT Input Current comparator.
ADAPTER +
ADAPTER -
Q1 (ACFET) Q2 (RBFET)
SI4435
SI4435
RC1
2.2Ω
C1
2.2u
R1
464k
1%
P
P
Controlled by
RC6
HOST
10Ω
RAC
0.010
C2 0.1uF C3 0.1uF
C6
1uF
R2
33.2k
1%
+3.3V_ALWAYS
OR
+5V_ALWAYS
R3
C16
1u
10k
27 CSSN
28 CSSP
22 DCIN
2 ACIN
12 GND
11 VDDSMB
13 ACOK
DISCRETE
LOGIC
R4 R10 R11
10k 10k 10k
3 VREF
C4 1uF
26 ICOUT
R12
10k
HOST
(EC)
Dig I/O
SMBus
DISCRETE
LOGIC
C5 100pF
7 CE
9 SDA
10 SCL
8 VICM
14 NC
16 NC
C14 C15
10uF 10uF
UGATE 24
bq24745
PHASE 23
BOOT 25
D1
VDDP 21
C8
BAT 54
1uF
C7
0.1uF
Q3
FDS6680A
L1
RSR
0.010
5.6uH
C10
0.1uF
LGATE 20
PGND 19
CSOP 18
CSON 17
VFB 15
ICREF 1
Q4
FDS6680A
C9
0.1uF
R22
100Ω
VREF
R7
200k
R8
200k
C17
0.1uF
EAO 4
EAI 5
FBO 6
C23
R19
51pF
7.5k
C21
R21
2000pF 200k
CHRG_IN
C13
2x10uF
PACK +
PACK -
R20 _C22
20k _130pF
R18
(1) Pullup rail could be either VREF or other system rail.
1400k
Figure 2. Typical System Schematic Using Internal Input-Current Comparator
PART NUMBER
bq24745
ORDERING INFORMATION
PACKAGE
ORDERING NUMBER
(Tape and Reel)
28-pin 5-mm × 5-mm QFN
bq24745RHDR
bq24745RHDT
QUANTITY
3000
250
PACKAGE THERMAL DATA
PACKAGE
QFN – RHD⁽¹⁾
θ_JA
36°C/W
T_A = 40°C
POWER RATING
2.36 W
DERATING FACTOR
ABOVE T_A = 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.
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