BQ2947_16 Datasheet, PDF (1/24 Pages) Texas Instruments – Overvoltage Protection for 2-Series to 4-Series Cell Li-Ion Batteries

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
bq2947
SLUSB15E – SEPTEMBER 2012 – REVISED FEBRUARY 2016
bq2947 Overvoltage Protection for 2-Series to 4-Series Cell Li-Ion Batteries
with External Delay Capacitor
1 Features
•1 2-, 3-, and 4-Series Cell Overvoltage Protection
• External Capacitor-Programmed Delay Timer
• Factory Programmed OVP Threshold (Threshold
Range 3.85 V to 4.6 V)
• Output Options: Active High or Open Drain Active
Low
• High-Accuracy Overvoltage Protection: ±10 mV
• Low Power Consumption I_CC ≈ 1 µA
(V_CELL(ALL) < V_PROTECT)
• Low Leakage Current Per Cell Input < 100 nA
• Small Package Footprint
– 8-Pin WSON (2.00 mm x 2.00 mm)
2 Applications
• Notebook
• UPS Battery Backup
3 Description
The bq2947 family is an overvoltage monitor and
protector for Li-Ion battery pack systems. Each cell is
monitored independently for an overvoltage condition.
In the bq2947 device, an external delay timer is
initiated upon detection of an overvoltage condition
on any cell. Upon expiration of the delay timer, the
output is triggered into its active state (either high or
low, depending on the configuration). The external
delay timer feature also includes the ability to detect
an open or shorted delay capacitor on the CD pin,
which will similarly trigger the output driver in an
overvoltage condition.
For quicker production-line testing, the bq2947 device
provides a Customer Test Mode with reduced delay
time.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq294700
WSON (8)
2.00 mm × 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
spacer
Simplified Schematic
100 Ω
Pack+
VCELL4
VCELL3
VCELL2
VCELL 1
VDD
1k
V4
1k ^0.1µF
V3
1k ^0.1µF
V2
1k
0 .1 µ F
PWPD
OUT
CD
VSS
V1
0 .1 µ F
0.1 µF 0.1 µF
Pack–
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.