www.ti.com
bq29400, bq29400A
bq29401, bq29405
SLUS568B – JULY 2003 – REVISED NOVEMBER 2004
VOLTAGE PROTECTION
ND
2-, 3-, OR 4-CELL Lion BATTERIES
FOR
(2 PROTECTION)
FEATURES
•
•
•
2-, 3-, or 4-Cell Secondary Protection
Low Power Consumption I
CC
< 2 µA
[VCELL
(ALL)
< V
(PROTECT)
]
High Accuracy Over Sense Voltage:
– bq29400: 4.35 V
±25
mV
– bq29400A: 4.40 V
±25
mV
– bq29401: 4.45 V
±25
mV
– bq29405: 4.65 V
±25
mV
Prefixed Protection Threshold Voltage
Programmable Delay Time
High Power Supply Ripple Rejection
Stable During Pulse Charge Operation
FUNCTION
Each cell in a multiple cell pack is compared to an
internal reference voltage. If one cell reaches an
overvoltage condition, the protection sequence be-
gins. The bq2940x 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.
PW PACKAGE
(TOP VIEW)
•
•
•
•
•
VC1
VC2
VC3
GND
1
2
3
4
DCT PACKAGE
(TOP VIEW)
8
7
6
5
OUT
VDD
CD
VC4
APPLICATIONS
2 Level Protection in Lion Battery Packs in
– Notebook PCs
– Portable Instrumentation
– Medical and Test Equipment
nd
OUT
VDD
CD
VC4
1
2
3
4
8
7
6
5
VC1
VC2
VC3
GND
DESCRIPTION
The bq29400, bq29400A, bq29401, and bq29405 are
BiCMOS secondary protection ICs for 2-, 3-, or 4-cell
Lithium-Ion battery packs that incorporate a
high-accuracy precision over voltage detection circuit.
They include a programmable delay circuit for over
voltage detection time.
ORDERING INFORMATION
T
A
V
(PROTECT)
4.35 V
–25°C to 85°C
4.40 V
4.45 V
4.65 V
(1)
PACKAGE
MSOP (DTC)
bq29400DCT3
bq29400ADCT3
bq29401DCT3
bq29405DCT3
SYMBOL
CIQ
CIT
CIR
CIS
TSSOP (PW)
(1)
bq29400PW
Not Available
bq29401PW
Not Available
SYMBOL
2400
-
2401
-
The bq29400, bq29400A, bq29401, and bq29405 are available taped and reeled. Add an R suffix to the device type (e.g.,
bq29400PWR) to order tape and reel version.
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2004, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
