Datasheet Texas Instruments BQ29449DRBT — Datenblatt

Not Recommended for New Designs 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 APPLICATIONS 1 2-Series, 3-Series, or 4-Series Cell Secondary
Protection
External Capacitor-Controlled Delay Timer
Low Power Consumption ICC < 2 ВµA Typical
[VCELL(ALL) < VPROTECT]
High-Accuracy Overvoltage Protection: В±25
mV with TA = 0В°C to 60В°C
Fixed Overvoltage Protection Thresholds:
4.30 V, 4.35 V, 4.40 V, 4.45 V, 4.50 V
Small 8L QFN Package 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 …