BQ24171_15 Datasheet, PDF (25/39 Pages) Texas Instruments – bq24171 JEITA-Compliant Stand-Alone, Switched-Mode Li-Ion and Li-Polymer Battery Charger With Integrated MOSFETs and Power Path Selector

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10 Application and Implementation
bq24171
SLUSAF2C – FEBRUARY 2011 – REVISED APRIL 2015
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.
10.1 Application Information
A typical application consists of a bq24171 with power path management and from 1- to 3-cell series Li-ion or Li-
polymer battery in a wide variety of portable applications where JEITA-compatible charging limits are desired.
10.2 Typical Application
12V Adapter
Q1
R_IN
2
C_IN
2.2?
VBAT
D2
D1
R1
10
Q2
R_AC: 10m
C12: 0.1µ
C11: 0.1µ
R11
4.02k
R12
4.02k
C2: 1µ
VREF
R4
100k
R5
22.1k
ACN
ACP
CMSRC
PVCC
BATDRV
VREF
R2
232k
R3
32.4k
ACDRV
VREF
SW
bq24171
ISET
BTST
ACSET
REGN
R6
1000k
R7
100k
R_T
103AT
VREF
R8
2.2k
R9
6.8k
AVCC
C1
1µ
C3: 0.1?
OVPSET
TTC
PGND
SRP
SRN
R10
1.5k
VREF
D3
TS
FB
THERMAL
STAT _PAD
System
C4: 10µ
R14
Q3
1k
L: 3.3?H _RSR:10m
VBAT
C5
0.047?
C7
0.1?
C6
1?
C8
0.1?
C9, C10
10? 10?
R2
299 kW
R2
100 kW
12-V input, 2-cell battery 8.4 V, 2-A charge current, 0.2-A precharge/termination current, 3-A DPM current, 18-V input
OVP
Figure 19. Typical Application Schematic
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