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FEATURES FUNCTION
APPLICATIONS
DESCRIPTION
GND
OUT
VDD
CD
VC4
VC1
VC3
1
2 VC2
3
4 5
6
7
8
DCT PACKAGE
(TOP VIEW)
1
2
3
4
8
7
6
5
VC1
VC2
VC3
GND
OUT
VDD
CD
VC4
PW PACKAGE
(TOP VIEW)
bq29410, bq29411, bq29412
SLUS669B – AUGUST 2005 – REVISED DECEMBER 2005
VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Li-Ion BATTERIES
(2 nd -LEVEL PROTECTION)
• 2-, 3-, or 4-Cell Secondary Protection Each cell in a multiple-cell pack is compared to an
internal reference voltage. If one cell reaches an• Low Power Consumption I CC < 2 µ A
overvoltage condition, the protection sequence[VCELL (ALL) < V (PROTECT) ]
begins. The bq2941x device starts charging an• Fixed High Accuracy Overvoltage Protection
external capacitor through the CD pin. When the CDThreshold
pin voltage reaches 1.2 V, the OUT pin changes from
– bq29410 = 4.35 V a low level to a high level.
– bq29411 = 4.40 V
– bq29412 = 4.45 V
• Programmable Delay Time of Detection
• High Power Supply Ripple Rejection
• Stable During Pulse Charge Operation
• 2 nd -Level Overvoltage Protection in Li-Ion
Battery Packs in:
– Notebook Computers
– Portable Instrumentation
– Portable Equipment
The bq2941x is a secondary overvoltage protection
IC for 2-, 3-, or 4-cell lithium-ion battery packs that
incorporates a high-accuracy precision overvoltage
detection circuit. It includes a programmable delay
circuit for overvoltage detection time.
ORDERING INFORMATION (1)
PACKAGE (3)T
A V (PROTECT) (2) MSOP (DCT3) SYMBOL PW
4.35 V bq29410DCT3R CJG bq29410PW bq29410PWR
– 40 ° C to 110 ° C 4.40 V bq29411DCT3R CJH bq29411PW bq29411PWR
4.45 V bq29412DCT3R CJJ bq29412PW bq29412PWR
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
Web site at www.ti.com .
(2) Contact your local Texas Instruments representative or sales office for alternative overvoltage threshold options.
(3) The "R" suffix indicates tape-and-reel packaging.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Copyright © 2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.