BQ2961_17 Datasheet, PDF (1/33 Pages) Texas Instruments – Overvoltage Protection for 2-Series, 3-Series, and 4-Series Cell Li-Ion Batteries with Regulated Output Supply

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bq2961, bq2962
SLUSBU5D – NOVEMBER 2013 – REVISED JANUARY 2017
bq296xxx Overvoltage Protection for 2-Series, 3-Series, and 4-Series Cell
Li-Ion Batteries with Regulated Output Supply
1 Features
•1 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
• Regulated Supply Output With Self-Disable and/or
External Enable/Disable Control
– Options: 3.3-V, 2.5-V, and 1.8-V (bq2960,
bq2961)
– Options: 3.3-V, 3.15-V, 3.0-V (bq2962)
• Low Power Consumption I_CC ≈ 4 µA
(V_CELL(ALL) < V_PROTECT)
• Extra Low Power Consumption With REG Output
Disabled, I_CC ~ 1.2 µA
• Low Leakage Current Per Cell Input < 100 nA
• Small Package Footprint
– 8-Pin WSON (2 mm × 2 mm)
2 Applications
• Notebook PC
• Ultrabooks
• Medical
• UPS Battery Backup
3 Description
The bq296xxx 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 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.
Device Information⁽¹⁾⁽²⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq2960
bq2961
WSON (8)
2.00 mm × 2.00 mm
bq2962
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
(2) The bq2960 is a 2-S to 3-S device. The bq2961 and bq2962
are 2-S to 4-S devices.
Simplified Schematic
100 Ÿ
VCELL3
VCELL2
VCELL1
1 NŸ
0.1 µF
1 NŸ
1 NŸ ^{0.1 µF}
0.1 µF
VDD
V3
bq2960
V2
OUT
REG
VSS
V1
REG_EN
PWPD
Protector ^{Pack +}
FETs
5 (*)
External
Circuit
e.g., RTC
0.1 µF
0.47 µF
* can be removed if Vss will be
connected first during cell
connection
Pack ±
100 Ÿ
VCELL4
VCELL3
VCELL2
VCELL1
1 NŸ
1 NŸ ^{0.1 µF}
1 NŸ ^{0.1 µF}
1 NŸ ^{0.1 µF}
0.1 µF
VDD
V4 _bq2961
V3 ^bq2962
OUT
REG
VSS
V2
V1
PWPD
Protector ^{Pack +}
FETs
5 (*)
External
Circuit
e.g., RTC
* can be removed if Vss will be
connected first during cell
connection
0.1 µF 0.47 µF
Pack ±
bq2960 REG out is controlled by MCU
10 M
(Optional)
MCU
CTL
Copyright © 2017, Texas Instruments Incorporated
1
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.