BQ29441 Datasheet, PDF (1/17 Pages) Texas Instruments – Voltage Protection for 2-Series, 3-Series, or 4-Series Cell Li-Ion Batteries

bq29440, bq2944L0
bq29441, bq29442, bq29443, bq29449, bq2944L9
www.ti.com
SLUSA15C – JUNE 2010 – REVISED NOVEMBER 2010
Voltage Protection for 2-Series, 3-Series, or 4-Series Cell Li-Ion Batteries
(Second-Level Protection)
Check for Samples: bq29440, bq2944L0, bq29441, bq29442, bq29443, bq29449, bq2944L9
FEATURES
1
• 2-Series, 3-Series, or 4-Series Cell Secondary
Protection
• External Capacitor-Controlled Delay Timer
• Low Power Consumption I_CC < 2 µA Typical
[V_CELL(ALL) < V_PROTECT]
• High-Accuracy Overvoltage Protection: ±25
mV with T_A = 0°C to 60°C
• Fixed Overvoltage Protection Thresholds:
4.30 V, 4.35 V, 4.40 V, 4.45 V, 4.50 V
• Small 8L QFN Package
APPLICATIONS
• Second-Level Protection in Li-Ion Battery
Packs
– Notebook Computers
– Power Tools
– Portable Equipment and Instrumentation
DESCRIPTION
The bq2944x is a secondary overvoltage protection IC for 2-series, 3-series, or 4-series cell Li-Ion battery packs
that incorporates a high-accuracy precision overvoltage detection circuit.
FUNCTION
The voltage of each cell in a battery pack is compared to an internal reference voltage. If any cells reach an
overvoltage condition, the bq2944x device starts a timer that provides a delay proportional to the capacitance on
the CD pin. Upon expiration of the internal timer, the OUT pin changes from a low state to a high state. An
optional latch configuration is available that holds the OUT pin in a high state indefinitely after an overvoltage
condition has satisfied the specified delay timer period. The latch is released when the CD pin is shorted to GND.
T
T
DRB Package
(Top View)
VC1 1
VC2 2
VC3 3
GND 4
8 OUT
7 VDD
6 CD
5 VC4
P0012-02
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated