BQ29209-Q1 Datasheet, PDF (1/23 Pages) Texas Instruments – Voltage Protection with Automatic Cell Balance

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bq29209-Q1
SLUSC62A – JUNE 2015 – REVISED MARCH 2016
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 I_CC < 3 µA Typical
(V_CELL(ALL) < V_PROTECT)
• Internal Cell Balancing Handles Current
up to 15 mA
• External Cell Balancing Mode Supported
• High-Accuracy Overvoltage Protection:
– ±25 mV with T_A = 0°C to 60°C
• Fixed Overvoltage Protection Threshold:
4.30 V
• Small 8L DRB Package
• Automotive-Qualified AEC Q100 Grade Two
2 Applications
• 2^nd 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 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.