VCELL

OUT

VDD

VSS

bq2946xx

Pack +

Pack –

NC

V1

VSS

bq294602, bq294604, bq294682

SLUSAS0C – DECEMBER 2011 – REVISED JULY 2015

www.ti.com

9 Application and Implementation

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

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.

Table 1. Parameters

PARAMETER

EXTERNAL COMPONENT

MIN

NOM

MAX

UNIT

Voltage monitor filter resistance

RIN

900

1000

1100

Ω

Voltage monitor filter capacitance

CIN

0.01

0.1

µF

Supply voltage filter resistance

RVD

100

1K

Ω

Supply voltage filter capacitance

CVD

0.1

µF

10

Submit Documentation Feedback

Copyright © 2011–2015, Texas Instruments Incorporated

Product Folder Links: bq294602 bq294604 bq294682