Texas Instruments bq29410 Data Sheet
Summary
The bq2941x series provides essential secondary overvoltage protection for 2-, 3-, or 4-cell Li-Ion battery packs. This device incorporates high-accuracy detection and structural safety features, including a programmable delay time circuit and dual-level monitoring. The manual details the electrical characteristics and operating limits necessary for implementing reliable energy management. It is primarily designed for portable electronics, such as notebook computers and instrumentation, ensuring safe power operation in multi-cell battery systems.
Page 1 Text Content
bq29410, bq29411, bq29412
www.ti.com
SLUS669B–AUGUST 2005–REVISED DECEMBER
VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Li-Ion BATTERIES
(2nd-LEVEL PROTECTION)
FEATURES FUNCTION
2-, 3-, or 4-Cell Secondary Protection
Each cell in multiple-cell pack is compared to an
Low Power Consumption ICC µA internal reference voltage. If one cell reaches an•
V(PROTECT)] overvoltage condition, the protection sequence[VCELL(ALL)
begins. The bq2941x device starts charging an•
Fixed High Accuracy Overvoltage Protection
external capacitor through the CD pin. When the CD
Threshold
pin voltage reaches 1.2 V, the OUT pin changes from
bq29410 4.35 low level to high level.
bq29411 4.40
DCT PACKAGE
bq29412 4.45
(TOP VIEW)
Programmable Delay Time of Detection
OUT VC1
High Power Supply Ripple Rejection
VDD VC2
Stable During Pulse Charge Operation
CD VC3
VC4 GND
APPLICATIONS
2nd-Level Overvoltage Protection in Li-Ion
Battery Packs in: PW PACKAGE
(TOP VIEW)
Notebook Computers
Portable Instrumentation
VC1 OUT
Portable Equipment
VC2 VDD VC3 CD
DESCRIPTION
GND VC4
The bq2941x is secondary overvoltage protection
IC for 2-, 3-, or 4-cell lithium-ion battery packs that
incorporates high-accuracy precision overvoltage
detection circuit. It includes programmable delay
circuit for overvoltage detection time.
ORDERING INFORMATION
PACKAGE
TA V(PROTECT)
MSOP (DCT3) SYMBOL PW
4.35 bq29410DCT3R CJG bq29410PW bq29410PWR
–40°C to 110°C 4.40 bq29411DCT3R CJH bq29411PW bq29411PWR
4.45 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.
Page Summary Contents For Texas Instruments bq29410 Data Sheet
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 11 |
| File Size | 227.43 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What types of batteries are the bq2941x devices designed for?
They are designed for 2-, 3-, or 4-cell lithium-ion battery packs.
How is overvoltage detection triggered and monitored?
The device compares each cell against a low power consumption internal reference voltage. Protection begins if one cell reaches an overvoltage condition.
What specific protection voltages are available for the three product variants?
bq29410 offers 4.35V, bq29411 offers 4.40V, and bq29412 offers 4.45V (at PROTECT).
Are there limitations regarding device handling or storage?
The leads should be shorted together or the device placed in conductive foam during storage/handling to prevent electrostatic damage.