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BQ29209-Q1 Datasheet(PDF) 7 Page - Texas Instruments

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Part # BQ29209-Q1
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

BQ29209-Q1 Datasheet(HTML) 7 Page - Texas Instruments

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CD
DELAY
d
t
C
X
´
=
d
CD
DELAY
t
C
X
=
5-V LDO
and POR
CD
OUT
VDD
GND
VC1
VC2
ICD =
150 nA
0.1 µF
CB_EN
+
Hys.
CB
Logic
CTRL
VC1_CB
CB2_EN
CB1 _EN
+
7
bq29209-Q1
www.ti.com
SLUSC62A – JUNE 2015 – REVISED MARCH 2016
Product Folder Links: bq29209-Q1
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The bq29209-Q1 provides overvoltage protection and cell balancing for 2-series cell lithium-ion battery packs.
8.1.1 Voltage Protection
Each cell voltage is continuously compared to a factory configured internal reference threshold. If either cell
reaches an overvoltage condition, the bq29209-Q1 device starts a timer that provides a delay proportional to the
capacitance on the CD pin. Upon expiration of the internal timer, the OUT pin changes from a low to high state.
8.1.2 Cell Balancing
If enabled, the bq29209-Q1 performs automatic cell-balance correction where the two cells are automatically
corrected for voltage imbalance by loading the cell with the higher voltage with a small balancing current. When
the cells are measured to be equal within nominally 0 mV, the load current is removed. It will be re-applied if the
imbalance exceeds nominally 30 mV. The cell mismatch correction circuitry is enabled by pulling the CB_EN pin
low, and disabled when CB_EN is pulled to greater than 2.2 V, for example, VDD.
If the internal cell balancing current of up to 15 mA is insufficient, the bq29209-Q1 may be configured via external
circuitry to support much higher external cell balancing current.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Protection (OUT) Timing
Sizing the external capacitor is based on the desired delay time as follows:
Where td is the desired delay time and XDELAY is the overvoltage delay time scale factor, expressed in seconds
per microFarad. XDELAY is nominally 9 s/µF. For example, if a nominal delay of 3 seconds is desired, use a CCD
capacitor that is 3 s / 9 s/µF = 0.33 µF.
The delay time is calculated as follows:


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