bq29209-Q1 Protection Datasheet

bq29209-Q1 Datasheet, PDF, Equivalent


Part Number

bq29209-Q1

Description

Voltage Protection

Manufacture

etcTI

Total Page 25 Pages
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BQ29209-Q1
SLUSC62C – JUNE 2015 – REVISED MAY 2019
BQ29209-Q1 Voltage Protection with Automatic Cell Balance
for 2-Series Cell Li-Ion Batteries
1 Features
1 2-series cell secondary protection
• Automatic cell imbalance correction with external
enable control
– ±30-mV enable, 0-mV disable thresholds
typical
• External capacitor-controlled delay timer
• External resistor-controlled cell balance current
• Low power consumption ICC < 3 µA typical
(VCELL(ALL) < VPROTECT)
• Internal cell balancing handles current
up to 15 mA
• External cell balancing mode supported
• High-accuracy overvoltage protection:
– ±25 mV with TA = 0°C to 60°C
• Fixed overvoltage protection threshold:
4.30 V
• Small 8L DRB package
• Automotive-qualified AEC Q100 grade two
2 Applications
• 2nd level protection in li-ion battery packs
– Emergency call (eCall)
– Netbook computers
– Power tools
– Portable equipment and instrumentation
– Battery backup systems
3 Description
The BQ29209-Q1 device is a secondary overvoltage
protection IC for 2-series cell lithium-ion battery packs
that incorporates a high-accuracy precision
overvoltage detection circuit and automatic cell
imbalance correction.
The voltage of each cell in a 2-series cell battery
pack is compared to a factory programmed internal
reference voltage. If either cell reaches an
overvoltage condition, the OUT pin changes from low
to high state.
The BQ29209-Q1 can perform automatic voltage-
based cell imbalance correction. Balancing can start
when the cell voltages are different by nominally
30 mV or more and stops when the difference is
nominally 0 mV. Cell balancing is enabled and
disabled by the CB_EN pin.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
BQ29209-Q1
VSON (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
PACK+
CELL2
CELL1
RIN2
RIN1
RCBext
1 VC2
CIN
OUT 8
2 VC1
VDD 7
CIN
3 VC1_CB CB_EN 6
4 CD
GND 5
PWR PAD
CCD
RVD
CVD
PACK-
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

bq29209-Q1
BQ29209-Q1
SLUSC62C – JUNE 2015 – REVISED MAY 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Options....................................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 3
7.1 Absolute Maximum Ratings ...................................... 3
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics........................................... 4
7.6 Recommended Cell Balancing Configurations ......... 6
7.7 Typical Characteristics .............................................. 6
8 Detailed Description .............................................. 7
8.1 Overview ................................................................... 7
8.2 Functional Block Diagram ......................................... 7
8.3 Feature Description................................................... 7
8.4 Device Functional Modes........................................ 12
9 Application and Implementation ........................ 12
9.1 Application Information............................................ 12
9.2 Typical Applications ................................................ 12
9.3 System Example ..................................................... 13
10 Power Supply Recommendations ..................... 14
11 Layout................................................................... 15
11.1 Layout Guidelines ................................................. 15
11.2 Layout Example .................................................... 15
12 Device and Documentation Support ................. 16
12.1 Receiving Notification of Documentation Updates
................................................................................. 16
12.2 Community Resources.......................................... 16
12.3 Trademarks ........................................................... 16
12.4 Electrostatic Discharge Caution ............................ 16
12.5 Glossary ................................................................ 16
13 Mechanical, Packaging, and Orderable
Information ........................................................... 16
4 Revision History
Changes from Revision B (November 2018) to Revision C
Page
• Added a clarification regarding operation if GND is not connected first in sequence ............................................................ 8
Changes from Revision A (March 2016) to Revision B
Page
• Changed component names in the Simplified Schematic ..................................................................................................... 1
• Changed a component name in Recommended Operating Conditions ................................................................................. 4
• Added the value of internal cell balancing switch resistances to Electrical Characteristics................................................... 5
• Changed resistor names ....................................................................................................................................................... 6
• Added Figure 5 to clarify the cell balancing description; updated the equations .................................................................. 9
• Changed values and component names in Figure 10.......................................................................................................... 12
• Changed component names and values used in the design example ................................................................................ 12
• Changed external cell balancing figure, equations, and description .................................................................................... 13
Changes from Original (June 2015) to Revision A
Page
• Changed resistor RVD location, added PACK+ and PACK– in the Simplified Schematic ..................................................... 1
• Deleted the Lead Temperature (soldering) from the Absolute Maximum Ratings table ....................................................... 3
• Changed resistor RVD location in Figure 10 ......................................................................................................................... 12
• Added title to Table 1............................................................................................................................................................ 12
• Changed resistor RVD location, added PACK+ and PACK– in Figure 12 ............................................................................ 14
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Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity BQ29209-Q1 SLUSC62C – JUNE 20 15 – REVISED MAY 2019 BQ29209-Q1 Volt age Protection with Automatic Cell Bala nce for 2-Series Cell Li-Ion Batteries 1 Features •1 2-series cell secondar y protection • Automatic cell imbalan ce correction with external enable cont rol – ±30-mV enable, 0-mV disable th resholds typical • External capacitor -controlled delay timer • External re sistor-controlled cell balance current • Low power consumption ICC < 3 µA t ypical (VCELL(ALL) < VPROTECT) • Inte rnal cell balancing handles current up to 15 mA • External cell balancing mo de supported • High-accuracy overvolt age protection: – ±25 mV with TA = 0 °C to 60°C • Fixed overvoltage prot ection threshold: 4.30 V • Small 8L D RB package • Automotive-qualified AEC Q100 grade two 2 Applications • 2nd level protection in li-ion battery pack s – Emergency call (eCall) – Netbook computers – Power tools – Portable equipment and instrumentatio.
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