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BQ29200 Datasheet(PDF) 13 Page - Texas Instruments

Part # BQ29200
Description   Voltage Protection with Automatic Cell Balance
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ29200 Datasheet(HTML) 13 Page - Texas Instruments

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FUSE
160
1 k
Si 1406
1
OUT 8
0.1 F
2
VDD 7
260
3
6
4
CD
GND 5
0.1
F
100
0.33 F
PWR PAD
0.1 F
VC1_ CB
VC1
VC 2
CB_ EN
100
PACK+
PACK±
CELL2
CELL1
13
bq29200, bq29209
www.ti.com
SLUSA52C – SEPTEMBER 2010 – REVISED MARCH 2016
Product Folder Links: bq29200 bq29209
Submit Documentation Feedback
Copyright © 2010–2016, Texas Instruments Incorporated
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 bq2920x is designed to be used in 2-series Li-Ion battery packs and with the option to include voltage-based
cell balancing. The number of parallel cells or the overall capacity of the battery only affects the cell balancing
circuit due to the level of potential imbalance that needs to be corrected.
9.2 Typical Applications
9.2.1 Battery Connection
Figure 9 shows the configuration for the 2-series cell battery connection with cell balancing enabled.
Figure 9. 2-Series Cell Configuration
9.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 1.
Table 1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE at TA = 25°C
Input voltage range
4 V to 10 V
Overvoltage Protection (OVT)
4.35 V
Overvoltage detection delay time
3 s
Overvoltage detection delay timer capacitor
0.33 µF
Cell Balancing Enabled
Yes
Cell Balancing Current, ICB1 and ICB2
10 mA
Cell Balancing Resistors, RCB, RCB1, RCB2 and RVD
RCB = 100
Ω, RCB1 = 260 Ω, RCB2 = 160 Ω, RVD = 100 Ω
9.2.1.2 Detailed Design Procedure
The bq2920x has limited features but there are some key calculations to be made when selecting external
component values.
Calculate the required CCD capacitor value for the voltage protection delay time. Care should be taken to
evaluate the tolerances of the capacitor and the bq2920x to ensure system specifications are met.
Calculate the cell balancing resistor values to provide a suitable level of balancing current that will, at a
minimum, counter act an increase in imbalance during normal operation of the battery. Care should be taken
to ensure any connectivity resistance is also considered as this will also reduce the balancing current level.


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