Datasheet

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)
Not Recommended for New Designs
bq29410, bq29411, bq29412
bq29413, bq29414
bq29415, bq29419
www.ti.com SLUS669G –AUGUST 2005–REVISED AUGUST 2008
VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Li-Ion BATTERIES
(2
nd
-LEVEL PROTECTION)
Check for Samples: bq29410, bq29411, bq29412, bq29413, bq29414, bq29415, bq29419
1
FEATURES
DESCRIPTION
The bq2941x is a secondary overvoltage protection
• 2-, 3-, or 4-Cell Secondary Protection
IC for 2-, 3-, or 4-cell lithium-ion battery packs that
• Low Power Consumption I
CC
< 2 µA
incorporates a high-accuracy precision overvoltage
[VCELL
(ALL)
< V
(PROTECT)
]
detection circuit. It includes a programmable delay
• Fixed High Accuracy Overvoltage Protection
circuit for overvoltage detection time.
Threshold
FUNCTION
– bq29410 = 4.35 V
Each cell in a multiple-cell pack is compared to an
– bq29411 = 4.40 V
internal reference voltage. If one cell reaches an
– bq29412 = 4.45 V
overvoltage condition, the protection sequence
– bq29413 = 4.50 V
begins. The bq2941x device starts charging an
external capacitor through the CD pin. When the CD
– bq29414 = 4.55 V
pin voltage reaches 1.2 V, the OUT pin changes from
– bq29415 = 4.60 V
a low level to a high level.
– bq29419 = 4.30 V
• Programmable Delay Time of Detection
• High Power Supply Ripple Rejection
• Stable During Pulse Charge Operation
APPLICATIONS
• 2
nd
-Level Overvoltage Protection in Li-Ion
Battery Packs in:
– Notebook Computers
– Portable Instrumentation
– Portable Equipment
1
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 © 2005–2008, 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.