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電池管理 IC
電池保護器

BQ29449

現行

2-4 芯串聯鋰離子/鋰聚合物電池的二級過電壓保護 (4.30V)

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產品規格表

BQ29449

現行
產品規格表 立即訂購

產品詳細資料

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 4.3 Operating temperature range (°C) -40 to 85 Battery overvoltage protection (min) (V) 4.275 Battery overvoltage protection (max) (V) 4.325
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 4.3 Operating temperature range (°C) -40 to 85 Battery overvoltage protection (min) (V) 4.275 Battery overvoltage protection (max) (V) 4.325
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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類型 標題 日期
* Data sheet Voltage Protection For Two-, Three-, or Four-Cell Li-Ion Batteries datasheet (Rev. C) 2010年 11月 30日
Application note QFN Layout Guidelines 2006年 7月 28日

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  • 進行中持續性的可靠性監測
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