±4.0

±3.5

±3.0

±2.5

±2.0

±1.5

±1.0

±0.5

0.0

±40

±20

0

20

40

60

80

100

120

Temperature (

ƒC)

C012

DOUT

COUT

V–

BAT

VSS

PACK +

PACK–

CELLN

CELLP

S

S

D

2. 2k

DSG

CHG

330

NC

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.

bq2970, bq2971, bq2972, bq2973

SLUSBU9C – MARCH 2014 – REVISED MARCH 2016

bq297xx Cost-Effective Voltage and Current Protection Integrated Circuit for Single-Cell

Li-Ion and Li-Polymer Batteries

1

1 Features

1

•

Input Voltage Range Pack+: VSS – 0.3 V to 12 V

•

FET Drive:

–

CHG and DSG FET Drive Output

•

Voltage Sensing Across External FETs for

Overcurrent Protection (OCP) Is Within ± 5 mV

(Typical)

•

Fault Detection

–

Overcharge Detection (OVP)

–

Over-Discharge Detection (UVP)

–

Charge Overcurrent Detection (OCC)

–

Discharge Overcurrent Detection (OCD)

–

Load Short-Circuit Detection (SCP)

•

Zero Voltage Charging for Depleted Battery

•

Factory Programmed Fault Protection Thresholds

–

Fault Detection Voltage Thresholds

–

Fault Trigger Timers

–

Fault Recovery Timers

•

Modes of Operation Without Battery Charger

Enabled

–

–

Shutdown Iq = 100 nA

•

+85°C

•

Package:

–

6-Pin DSE (1.50 mm × 1.50 mm × 0.75 mm)

2 Applications

•

Tablet PC

•

Mobile Handset

•

Handheld Data Terminals

3 Description

The bq2970 battery cell protection device provides an

accurate monitor and trigger threshold for overcurrent

protection

during

high

discharge/charge

current

operation or battery overcharge conditions.

The bq2970 device provides the protection functions

for Li-Ion/Li-Polymer cells, and monitors across the

external power FETs for protection due to high

charge or discharge currents. In addition, there is

overcharge and depleted battery monitoring and

protection. These features are implemented with low

current consumption in NORMAL mode operation.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

bq2970, bq2971,

bq2972, bq2973 (2)

WSON (6)

1.50 mm × 1.50 mm

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

the end of the datasheet.

(2) For available released devices, see the Released Device

Configurations table.

Simplified Schematic

OCD Detection Accuracy Versus Temperature