TEXAS INSTRUMENTS bq29410, bq29411, bq29412 Technical data

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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)

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VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Li-Ion BATTERIES

(2

FEATURES FUNCTION

• 2-, 3-, or 4-Cell Secondary Protection

• Low Power Consumption ICC< 2 µA

[VCELL

• Fixed High Accuracy Overvoltage Protection

Threshold
– bq29410 = 4.35 V
– bq29411 = 4.40 V
– bq29412 = 4.45 V

• Programmable Delay Time of Detection

• High Power Supply Ripple Rejection

• Stable During Pulse Charge Operation

< V

(ALL)

(PROTECT)

]

bq29410, bq29411, bq29412

SLUS669B – AUGUST 2005 – REVISED DECEMBER 2005

nd

-LEVEL PROTECTION)

Each cell in a multiple-cell pack is compared to an
internal reference voltage. If one cell reaches an
overvoltage condition, the protection sequence
begins. The bq2941x device starts charging an
external capacitor through the CD pin. When the CD
pin voltage reaches 1.2 V, the OUT pin changes from
a low level to a high level.

APPLICATIONS

• 2nd-Level Overvoltage Protection in Li-Ion

Battery Packs in:
– Notebook Computers
– Portable Instrumentation
– Portable Equipment

DESCRIPTION

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

T

A

–40 ° C to 110 ° C 4.40 V bq29411DCT3R CJH bq29411PW bq29411PWR

(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.

V

(PROTECT)

(2)

MSOP (DCT3) SYMBOL PW

4.35 V bq29410DCT3R CJG bq29410PW bq29410PWR

4.45 V bq29412DCT3R CJJ bq29412PW bq29412PWR

(1)

PACKAGE

(3)

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.

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.

Copyright © 2005, Texas Instruments Incorporated

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bq29410, bq29411, bq29412

SLUS669B – AUGUST 2005 – REVISED DECEMBER 2005

These devices have limited built-in ESD protection. The leads should be shorted together or the device
placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range unless otherwise noted

Supply voltage range VDD –0.3 V to 28 V

Input voltage range

Output voltage range

Continuous total power dissipation See Dissipation Rating Table
Storage temperature range, T
Lead temperature (soldering, 10 s) 300 ° C

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating

conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to ground of this device except the differential voltage of VC1-VC2, VC2-VC3, VC3-VC4, and VC4-GND.

VC1, VC2, VC3, VC4 –0.3 V to 28 V
VC1 TO VC2, VC2 TO VC3, VC3 TO VC4, VC4 TO GND –0.3 V to 8 V
OUT –0.3 V to 28 V
CD –0.3 V to 28 V

stg

(1) (2)

UNIT

–65 ° C to 150 ° C

PACKAGE DISSIPATION RATINGS

PACKAGE

DCT 412 mW 3.3 mW/ ° C 264 mW 214 mW

PW 525 mW 4.2 mW/ ° C 336 mW 273 mW

TA= 25 ° C DERATING FACTOR TA= 70 ° C TA= 85 ° C

POWER RATING ABOVE TA= 25 ° C POWER RATING POWER RATING

RECOMMENDED OPERATING CONDITIONS

V

V

t
R
C
R
C
T

Supply voltage 4 25 V

DD

Input voltage range V

I

Delay time capacitance 0.22 µF

d(CD)

Voltage-monitor filter resistance 100 1k Ω

IN

Voltage-monitor filter capacitance 0.01 0.1 µF

IN

Supply-voltage filter resistance 0 1 k Ω

VD

Supply-voltage filter capacitance 0.1 µF

VD

Operating ambient temperature range –40 110 ° C

A

VC1, VC2, VC3, VC4 0 V
VCn – VC (n=1), (n=1, 2, 3), VC4 – GND 0 5

MIN NOM MAX UNIT

DD

2

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bq29410, bq29411, bq29412

SLUS669B – AUGUST 2005 – REVISED DECEMBER 2005

ELECTRICAL CHARACTERISTICS

over recommended operating free-air temperature range, TA= 25 ° C (unless otherwise noted)

PARAMETER TEST CONDITION MIN NOM MAX UNIT

V

(OA)

V

(PROTECT)

V

hys

I

IN

t

D1

I

(CD_dis)

I

CC

I

OH

I

OL

Overvoltage detection
accuracy

Overvoltage
detection voltage

Overvoltage detection
hysteresis

(1)

(1)

Input current 0.3 µA
Overvoltage detection delay

time
CD GND clamp current V

Supply current µA

High-level output current –1 mA

Low-level output current 5 µA

(1) Levels of the overvoltage detection and the hysteresis can be adjusted. For assistance, contact a Texas Instruments sales

representative.

TA= 25 ° C 25 35
TA= –20 ° C to 85 ° C 25 50 mV
TA= –40 ° C to 110 ° C 80
bq29410 4.35
bq29411 4.40 V
bq29412 4.45

V2, V3 , VC4 input ,V
VC1 = VC2 = VC3 = VC4 = 3.5 V (see Figure 1 )

V

= VC1, CD = 0.22 µF 1 1.5 2 S

DD

= VC1, CD = 1 V 5 12 µA

DD

V

= VC1,

DD

VC1–VC2 = VC2–VC3 = VC3–VC4 = VC4–GND = 3.5 V (see 2 3

= VC1

DD

Figure 1 )

V

= VC1,

DD

VC1–VC2 = VC2–VC3 = VC3–VC4 = VC4–GND = 2.3 V (see 1.5 2.5

Figure 1 )

OUT = 3 V, V
VC1–VC2 = VC2–VC3 = VC3–VC4 = VC4–GND = 4.5 V

OUT = 0.1 V, V
VC1–VC2 = VC2–VC3 = VC3–VC4 = VC4–GND = 3.5 V

= VC1,

DD

= VC1,

DD

300 mV

3

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1

2

6
5

8

1

2

6
5

8

1

2

6

5

8

3

4

887

GNDVC4

OUT

VC1
VC2
VC3

VDD

CD

GND

VC4

OUT

VC1

VC2
VC3

VDD

CD

bq29410, bq29411, bq29412

SLUS669B – AUGUST 2005 – REVISED DECEMBER 2005

Figure 1. ICC, IINMeasurement (DCT Package)

Terminal Functions

TERMINAL

MSOP TSSOP

(DCT) (PW)

NAME

8 1 VC1 Sense voltage input for most positive cell
7 2 VC2 Sense voltage input for second most positive cell
6 3 VC3 Sense voltage input for third most positive cell
5 4 GND Ground pin
4 5 VC4 Sense voltage input for least positive cell
3 6 CD An external capacitor is connected to determine the programmable delay time
2 7 VDD Power supply
1 8 OUT Output

DESCRIPTION

4