BQ24765_15 Datasheet, PDF (28/43 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

bq24765
SLUS999A – NOVEMBER 2009 – REVISED NOVEMBER 2015
9 Application and Implementation
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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 bq24765EVM-349 evaluation module (EVM) is a complete charger module for evaluating the bq24765. The
application curves were taken using the bq24765EVM-349. Refer to the bq24765 EVM (HPA349) User's Guide,
SLUU415 for EVM information.
9.2 Typical Application
ADAPTER
+
ADAPTER -
Rc1
2
C1
2.2uF
P
P
Q1 (ACFET) Q2 (ACFET)
SI4435
SI4435
Controlled
by HOST
RAC
0.010
R1
464k
1%
R2
33.2k
1%
C2 0.1uF C3 0.1uF
DISCRETE
LOGIC
R4 R5 _RC1
10k 10k _100k
R3
10k
C4
R6 ^1uF
10k
R7
RC2
10k
20k
DCINA
QTOP
CSSN
CSSP
ACIN ^QBOT
AGND
DCINP
DCINP
DCINP
PHASE
PHASE
PHASE
PHASE
PHASE
BOOT
VDDP
VDDSMB
PGND
PGND
PGND
PGND
bq24765
ACOK
VREF
ICOUT
ICREF
CSOP
CSON
VFB
Dig I/O
HOST
CE
(EC) ^SMBus
SDA
EAO
SCL
EAI
DISCRETE
VICM
FBO
LOGIC
C5 100pF
RC6
20
C6
0.47uF
C17 C18
10uF _10uF
Q3 (BATFET)
SI4435
Controlled
by HOST
CHRG_IN
R7
5.6
C7
0.1uF
D1 BAT54
C8
1uF
L1
3.3uH
RSR
0.010
C12
10uF
C10
0.1uF
C11
10uF
C9
0.1uF
PACK +
PACK -
C13
0.1u
C14
R8
51pF _7.5k
C15
2000pF
R9
20k ^C16
130pF
R10
200k
V_IN = 20 V, V_BAT = 4-cell Li-Ion, I_CHARGE = 4.5 A, Idpm = 5 A
Figure 17. Typical System Schematic, Using Internal Input Current Comparator
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