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FEATURES FUNCTION
APPLICATIONS
DESCRIPTION
1
2
3
4
8
7
6
5
VC1
VC2
VC3
GND
OUT
VDD
CD
VC4
PW PACKAGE
(TOP VIEW)
GND
OUT
VDD
CD
VC4
VC1
VC3
1
2 VC2
3
4 5
6
7
8
DCT PACKAGE
(TOP VIEW)
bq29400, bq29400A
bq29401, bq29405
SLUS568B – JULY 2003 – REVISED NOVEMBER 2004
VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Lion BATTERIES
(2 ND 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 be-[VCELL (ALL) < V (PROTECT) ]
gins. The bq2940x device starts charging an external• High Accuracy Over Sense Voltage:
capacitor through the CD pin. When the CD pin– bq29400: 4.35 V ± 25 mV
voltage reaches 1.2 V, the OUT pin changes from a
low level to a high level.– 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
• 2 nd Level Protection in Lion Battery Packs in
– Notebook PCs
– Portable Instrumentation
– Medical and Test Equipment
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
PACKAGET
A V (PROTECT) MSOP (DTC) SYMBOL TSSOP (PW) (1) SYMBOL
4.35 V bq29400DCT3 CIQ bq29400PW 2400
4.40 V bq29400ADCT3 CIT Not Available -– 25 ° C to 85 ° C
4.45 V bq29401DCT3 CIR bq29401PW 2401
4.65 V bq29405DCT3 CIS Not Available -
(1) 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. Copyright © 2003 – 2004, 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.