BQ294602_17 Datasheet, PDF (10/21 Pages) Texas Instruments – Single-Cell Protector for Li-Ion Batteries

bq294602, bq294604, bq294682, bq294624
SLUSAS0D – DECEMBER 2011 – REVISED APRIL 2017
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 bq2946xx devices are a family of second-level protectors used for overvoltage protection of the single-cell
battery pack in the application. The OUT pin drives a NMOS FET that connects the fuse to ground in the event of
a fault condition. This provides a shorted path to use the battery and/or charger power to blow the fuse and cut
the power path.
9.1.1 Application Configuration
Changes to the ranges stated in Table 1 may impact the accuracy of the cell measurements. Figure 8 shows
each external component.
NOTE
Connect VSS (pins 3 and 4) externally to the CELL– terminal.
9.2 Typical Application
Pack +
VCELL
bq2946xx
NC
OUT
RIN
V1
VDD
VSS
VSS
CIN
RVD
CVD
Pack –
Figure 8. Application Configuration Schematic
NOTE
Connect VSS (pins 3 and 4) externally to the CELL– terminal.
9.2.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
PARAMETER
Voltage monitor filter resistance
Voltage monitor filter capacitance
Supply voltage filter resistance
Supply voltage filter capacitance
Table 1. Parameters
EXTERNAL COMPONENT
MIN
RIN
900
CIN
0.01
RVD
100
CVD
NOM
1000
0.1
0.1
MAX
1100
1K
UNIT
Ω
µF
Ω
µF
10
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