CELL1

CELL2

OUT

VDD

CB_EN

GND

1

2

4

3

CD

VC2

VC1

VC1_CB

8

7

5

6

PWR PAD

PACK+

PACK-

Product

Folder

Sample &

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Technical

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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.

bq29200, bq29209

SLUSA52C – SEPTEMBER 2010 – REVISED MARCH 2016

bq2920x Voltage Protection with Automatic Cell Balance for 2-Series Cell Li-Ion Batteries

1

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

•

•

Internal Cell Balancing Handles Current

up to 15 mA

•

External Cell Balancing Mode Supported

•

High-Accuracy Overvoltage Protection:

–

•

Fixed Overvoltage Protection Thresholds:

4.30 V, 4.35 V

•

Small 8L DRB Package

2 Applications

•

–

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

VSON (8)

3.00 mm × 3.00 mm

bq29209

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Simplified Schematic