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Product details

Parameters

Function Protection Number of series cells (Min) 2 Number of series cells (Max) 4 Communication interface No Communication Features • 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 – bq29415 = 4.60 V. – bq29419 = 4.30 V • Programmable Delay Time of Detection • High Power Supply Ripple Rejection • Stable During Pulse Charge Operation Typical operating current (Typ) (uA) 2.0 Rating Catalog Vin (Max) (V) 25 open-in-new Find other Battery protectors

Package | Pins | Size

SSOP (DCT) 8 12 mm² 2.95 x 4 TSSOP (PW) 8 19 mm² 3 x 6.4 open-in-new Find other Battery protectors

Features

  • 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
  • APPLICATIONS
    • 2nd-Level Overvoltage Protection in Li-Ion Battery Packs in:
      • Notebook Computers
      • Portable Instrumentation
      • Portable Equipment
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Description

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.

FUNCTION

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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Technical documentation

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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

CAD/CAE symbols

Package Pins Download
SM8 (DCT) 8 View options
TSSOP (PW) 8 View options

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