BQ2961, BQ2962
SLUSBU5O – NOVEMBER 2013 – REVISED JULY 2021
BQ296xxx Overvoltage Protection for 2-Series, 3-Series, and 4-Series Cell
Li-Ion Batteries with Regulated Output Supply
1 Features
3 Description
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•
•
2-series, 3-series, 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
The BQ296xxx family is a high-accuracy, low-power
overvoltage protector with a 2-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.
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•
•
Regulated supply output with self-disable and/or
external enable/disable control
The regulated output supply delivers up to 2-mA
(max) output current to drive always-on circuits, such
as a real-time clock (RTC) oscillator. The BQ296xxx
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.
– Options: 3.3 V, 2.5 V, and 1.8 V (BQ2961)
– Options: 3.3 V, 3.15 V, 3.0 V (BQ2962)
Low power consumption ICC ~ 4 µA
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•
(VCELL(ALL) < VPROTECT
)
Extra low power consumption with reg output
disabled, ICC ~ 1.2 µA
Low leakage current per cell input < 100 nA
Small package footprint
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– 8-Pin WSON (2 mm × 2 mm)
Device Information
PART NUMBER(1)
BQ2961
PACKAGE
BODY SIZE (NOM)
2 Applications
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•
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Notebook PC
Ultrabooks
Medical
WSON (8)
2.00 mm × 2.00 mm
BQ2962
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
UPS battery backup
Pack +
Protector
FETs
100 Ω
OUT
REG
VDD
V4
External
Circuit
e.g., RTC
1 kΩ
5 ꢀ (*)
0.1µF
0.1µF
0.1µF
VCELL4
VCELL3
1 kΩ
1 kΩ
V3
V2
VSS
V1
* can be removed if Vss will be
connected first during cell
connection
PWPD
VCELL2
VCELL1
1 kΩ
0.1µF
0.47 µF
0.1µF
Pack œ
Simplified Schematic
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.