Pack +

100 Q

VCELL2

VCELL1

OUT

VDD

VSS

Pack ±

V2

V1

REG_EN

1 kQ

V3

REG

VCELL3

PWPD

bq2960xy

MCU

CTL

0.1 µF

0.1 µF

0.1 µF

0.1 µF

Protector

FETs

0.47 µF

10 M

(Optional)

External

Circuit

e.g., RTC

1 kQ

1 kQ

5

(*)

* can be removed if Vss will be

connected first during cell

connection

bq2960xy REG out is controlled by MCU

VCELL2

VCELL1

OUT

VDD

VSS

1 kQ

1 kQ

Pack ±

V3

V2

V1

1 kQ

V4

REG

VCELL3

PWPD

bq2961xy

0.1 µF

0.1 µF

0.1 µF

0.1 µF

Pack +

Protector

FETs

0.47 µF

External

Circuit

e.g., RTC

0.1 µF

VCELL4

1 kQ

5

(*)

* can be removed if Vss will be

connected first during cell

connection

100 Q

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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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.

bq2961

SLUSBU5A – MAY 2015 – REVISED JANUARY 2016

BQ2960XY/BQ2961XY Overvoltage Protection for 2-Series, 3-Series, and 4-Series Cell

Li-Ion Batteries with Regulated Output Supply

1

1 Features

1

•

2-, 3-, and 4-Series Cell Overvoltage Protection

(OVP)

•

Fixed Delay Timer to Trigger FET Drive Output

(3-s, 4-s, 5.5-s or 6.5-s Options)

•

Factory Programmed OVP Threshold (Threshold

Range 3.85 V to 4.6 V)

•

Output Options: Active High

•

High-Accuracy Overvoltage Protection:

±10 mV

•

Regulated Supply Output (3.3-V, 2.5-V, 1.8-V

Options) with self-disable and/or external

enable/disable control

•

•

Extra Low Power Consumption with REG output

•

Low Leakage Current Per Cell Input < 100 nA

•

Small Package Footprint

–

8-Pin WSON (2 mm x 2 mm)

2 Applications

•

Notebook PC

•

Ultrabooks

•

Medical

•

UPS Battery Backup

3 Description

The bq296xyz family is a high accuracy, low power

overvoltage protector with a 1-mA regulated output

supply for Li-Ion battery pack applications.

Each cell in a 2-series to 4-series cell stack is

individually monitored for an overvoltage condition.

An internally fixed-delay timer is initiated upon

detection of an overvoltage condition on any cell;

upon expiration of the delay timer, an output pin is

triggered into an active state to indicate that an

overvoltage condition has occurred.

The regulated output supply delivers up to 1-mA

(max) output current to drive always-on circuits, such

as a real-time clock (RTC) oscillator. The bq296xyz

family has a self-disable function to turn off the

regulated output if any cell voltage falls below a

certain threshold, thereby preventing drain on the

battery, and provides an external control to enable or

disable the regulated output.

Device Information(1)(2)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

bq2960xy

WSON (8)

2.00 mm × 2.00 mm

bq2961xy

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

the end of the datasheet.

(2) The bq2960xy is a 2- to 3-S device and bq2961xy is a 2- to 4-

S device.

4 Simplified Schematic