Product details


Function Protection Number of series cells (Min) 2, 3, 4 Number of series cells (Max) 3, 4 Features Overvoltage, Single pin output drive Typical operating current (Typ) (uA) 2 Rating Catalog Vin (Max) (V) 25 open-in-new Find other Battery protectors

Package | Pins | Size

TSSOP (PW) 8 19 mm² 3 x 6.4 open-in-new Find other Battery protectors


  • 2-, 3-, or 4-Cell Secondary Protection
  • Low Power Consumption ICC < 2 µA [VCELL(ALL) < V(PROTECT)]
  • Fixed High Accuracy Overvoltage Protection Threshold
    • bq29410 = 4.35 V
    • bq29411 = 4.40 V
    • bq29412 = 4.45 V
    • bq29413 = 4.50 V
    • bq29414 = 4.55 V
    • bq29415 = 4.60 V
    • bq29419 = 4.30 V
  • Programmable Delay Time of Detection
  • High Power Supply Ripple Rejection
  • Stable During Pulse Charge Operation
    • 2nd-Level Overvoltage Protection in Li-Ion Battery Packs in:
      • Notebook Computers
      • Portable Instrumentation
      • Portable Equipment
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The bq2941x is a secondary overvoltage protection IC for 2-, 3-, or 4-cell lithium-ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit. It includes a programmable delay circuit for overvoltage detection time.


Each cell in a multiple-cell pack is compared to an internal reference voltage. If one cell reaches an overvoltage condition, the protection sequence begins. The bq2941x device starts charging an external capacitor through the CD pin. When the CD pin voltage reaches 1.2 V, the OUT pin changes from a low level to a high level.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
BQ2947 ACTIVE Lithium-ion protection for accurate cell-by-cell voltage monitoring This product is a 3-s - 5-s monitor with out integrated ADC.

Technical documentation

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Type Title Date
* Data sheet Voltage Protection for 2-, 3-, or 4-Cell Li-Ion Batteries (2nd Level Protection) datasheet (Rev. G) Aug. 18, 2008
Application note Stacking Multiple bqq2941x Li-Ion Secondary Voltage Protectors Aug. 27, 2007

Design & development

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TSSOP (PW) 8 View options

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