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bq2946xx

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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.

bq294602, bq294604, bq294682, bq294624

SLUSAS0D – DECEMBER 2011 – REVISED APRIL 2017

bq2946xx Single-Cell Protector for Li-Ion Batteries

1

1 Features

1

•

Single-Cell Overvoltage Monitor for Secondary

Protection

•

Fixed Programmable Delay Timer

•

Fixed Overvoltage Protection (OVP) Threshold

–

Available Range of 3.85 V to 4.6 V

•

Fixed OVP Delay Option: 4 s or 6.5 s

•

High-Accuracy OVP:

± 10 mV

•

•

Low Leakage Current per Cell Input < 100 nA

•

Small Package Footprint

–

6-Pin SON

2 Applications

•

Second-Level Protection in Li-Ion Battery Packs

in:

–

Tablets

–

Slates

–

Portable Equipment and Instrumentation

3 Description

The bq2946xx family of products is a secondary-level

overvoltage monitor and protector for Li-Ion battery

pack systems. The cell is monitored for overvoltage

condition and triggers an internal counter once the

OVP threshold is exceeded; after a fixed set delay,

the out is transitioned to a high level. The output is

reset (goes low) if the cell voltage drops below the

set threshold minus the hysteresis.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

bq294602

SON (6)

2.00 mm × 2.00 mm

bq294604

bq294682

bq294624

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

the end of the data sheet.

Simplified Schematic