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| BQ27742-G1 Datasheet, PDF (39/46 Pages) Texas Instruments – Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection | |||
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www.ti.com
bq27742-G1
SLUSBV9C â MARCH 2014 â REVISED FEBRUARY 2016
Layout Guidelines (continued)
10.1.6 High Current and Low Current Path Separation
For best possible noise performance, it is extremely important to separate the low current and high current loops
to different areas of the board layout. The fuel gauge and all support components should be situated on one side
of the boards and tap off of the high current loop (for measurement purposes) at the sense resistor. Routing the
low current ground around instead of under high current traces will further help to improve noise rejection. Last,
the high current path should be confined to a small loop from the battery, through the FETs, into the PACK
connector, and back.
10.2 Layout Example
Use short and wide
traces to minimize
inductance
CESD1 CESD2
RSENSE
Use copper pours for
battery power path to
minimize IR losses
RSRN
RSRP
CSRP
CSRN
CDIFF
Keep differential
traces length
matched
RVPWR
RBAT
CVPWR
SRP
CHG
SRN
NC
VPWR
BAT
Kelvin connect BAT
sense line right at
positive battery
terminal
Star ground right at
negative battery
terminal for low current
return path
CBAT
VSS
HDQ
CREG25
REG25
TS
RTHERM
DSG
PACK
P
SDA
RC2
SCL
CTHERM
S1
G1
S1
S2
G2
S2
RDSG
RCHG
PACK+
RPACKP
CESD3
CESD4
Use short and wide
traces to minimize
inductance
CPACKP
RESD1
RESD3
Use short and wide
traces to minimize
inductance
RESD2
RESD4
SDA
SCL
Star ground right at PACK-
for ESD return path
Via connects to Power Ground
Via connects between two layers
Figure 26. bq27742-G1 Board Layout
PACK-
Copyright © 2014â2016, Texas Instruments Incorporated
Product Folder Links: bq27742-G1
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