BQ29443 Texas instruments

BQ29443

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BQ29443

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Описание

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.

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

Function	Protection
Number of series cells (min)	2, 3, 4
Number of series cells (max)	3, 4
Features	Overvoltage, Single pin output drive
Operating current (typ) (µA)	2
Rating	Catalog
Vin (max) (V)	28
Overvoltage protection	4.5
Operating temperature range (°C)	-40 to 85
Battery overvoltage protection (min) (V)	4.475
Battery overvoltage protection (max) (V)	4.525