bq29209 Protection Datasheet

bq29209 Datasheet, PDF, Equivalent


Part Number

bq29209

Description

Voltage Protection

Manufacture

etcTI

Total Page 25 Pages
Datasheet
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bq29209
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bq29200, bq29209
SLUSA52C – SEPTEMBER 2010 – REVISED MARCH 2016
bq2920x 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 Thresholds:
4.30 V, 4.35 V
• Small 8L DRB Package
2 Applications
• 2nd Level Protection in Li-Ion Battery Packs
– Netbook Computers
– Power Tools
– Portable Equipment and Instrumentation
– Battery Backup Systems
3 Description
The bq2920x 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 bq2920x 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)
bq29200
bq29209
VSON (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
PACK+
CELL2
CELL1
RCB2
RCB1
RCB
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
bq29200, bq29209
SLUSA52C – SEPTEMBER 2010 – REVISED MARCH 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Options....................................................... 4
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 5
7.6 Recommended Cell Balancing Configurations ......... 7
7.7 Typical Characteristics .............................................. 7
8 Detailed Description .............................................. 8
8.1 Overview ................................................................... 8
8.2 Functional Block Diagram ......................................... 8
8.3 Feature Description................................................... 8
8.4 Device Functional Modes........................................ 12
9 Application and Implementation ........................ 13
9.1 Application Information............................................ 13
9.2 Typical Applications ................................................ 13
9.3 System Example ..................................................... 14
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 Related Links ........................................................ 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 (December 2014) to Revision C
Page
• Changed Typical Application title to Simplified Schematic .................................................................................................... 1
• Changed resistor RVD location, added PACK+ and PACK- in the Simplified Schematic image ............................................ 1
• Deleted the Lead Temperature (soldering) from the Absolute Maximum Ratings table ....................................................... 4
• Deleted table notes 2 through 7 from the Thermal Information.............................................................................................. 5
• Changed resistor RVD location in Figure 9 ........................................................................................................................... 13
• Added title to Table 1............................................................................................................................................................ 13
• Changed resistor RVD location, added PACK+ and PACK- in Figure 11 ............................................................................ 14
Changes from Revision A (September 2010) to Revision B
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
2 Submit Documentation Feedback
Copyright © 2010–2016, Texas Instruments Incorporated
Product Folder Links: bq29200 bq29209


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community bq29200, bq29209 SLUSA52C SEPTEMBER 2010 – REVISED MARCH 2016 bq2920x Voltage Protection with Automa tic Cell Balance for 2-Series Cell Li-I on Batteries 1 Features •1 2-Series Cell Secondary Protection • Automatic Cell Imbalance Correction with Externa l Enable Control – ±30-mV Enable, 0- mV Disable Thresholds Typical • Exter nal Capacitor-Controlled Delay Timer External Resistor-Controlled Cell Bal ance Current • Low Power Consumption ICC < 3 µA Typical (VCELL(ALL) < VPROT ECT) • Internal Cell Balancing Handle s Current up to 15 mA • External Cell Balancing Mode Supported • High-Accu racy Overvoltage Protection: – ±25 m V with TA = 0°C to 60°C • Fixed Ove rvoltage Protection Thresholds: 4.30 V, 4.35 V • Small 8L DRB Package 2 Appl ications • 2nd Level Protection in Li -Ion Battery Packs – Netbook Computer s – Power Tools – Portable Equipment and Instrumentation – Battery Backup Systems 3 Description The.
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