Detalles del producto

Function Protection Number of series cells (min) 2, 3, 4 Number of series cells (max) 3, 4 Features External delay capacitor, 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
Function Protection Number of series cells (min) 2, 3, 4 Number of series cells (max) 3, 4 Features External delay capacitor, 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
VSON (DRB) 8 9 mm² 3 x 3
  • 2-Series, 3-Series, or 4-Series Cell Secondary Protection
  • External Capacitor-Controlled Delay Timer
  • Low Power Consumption ICC < 2 µA Typical
    [VCELL(ALL) < VPROTECT]
  • High-Accuracy Overvoltage Protection:
    ±25 mV with TA = 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

  • 2-Series, 3-Series, or 4-Series Cell Secondary Protection
  • External Capacitor-Controlled Delay Timer
  • Low Power Consumption ICC < 2 µA Typical
    [VCELL(ALL) < VPROTECT]
  • High-Accuracy Overvoltage Protection:
    ±25 mV with TA = 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

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.

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.

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Documentación técnica

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Tipo Título Fecha
* Data sheet Voltage Protection For Two-, Three-, or Four-Cell Li-Ion Batteries datasheet (Rev. C) 30 nov 2010

Diseño y desarrollo

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Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

Soporte y capacitación

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