Product details

Function Protection Number of series cells (Min) 2, 3, 4 Number of series cells (Max) 3, 4 Features External delay capacitor, Single pin output drive Typical operating current (Typ) (uA) 1 Rating Catalog Vin (Max) (V) 20
Function Protection Number of series cells (Min) 2, 3, 4 Number of series cells (Max) 3, 4 Features External delay capacitor, Single pin output drive Typical operating current (Typ) (uA) 1 Rating Catalog Vin (Max) (V) 20
WSON (DSG) 8 4 mm² 2 x 2
  • 2-, 3-, and 4-series cell overvoltage protection
  • External capacitor-programmed delay timer
  • Factory programmed OVP threshold (threshold range 3.85 V to 4.6 V)
  • Output options: active high or open drain active low
  • High-accuracy overvoltage protection: ±10 mV
  • Low power consumption ICC ≈ 1 µA (VCELL(ALL) < VPROTECT)
  • Low leakage current per cell input < 100 nA
  • Small package footprint
    • 8-pin WSON (2.00 mm x 2.00 mm)
  • 2-, 3-, and 4-series cell overvoltage protection
  • External capacitor-programmed delay timer
  • Factory programmed OVP threshold (threshold range 3.85 V to 4.6 V)
  • Output options: active high or open drain active low
  • High-accuracy overvoltage protection: ±10 mV
  • Low power consumption ICC ≈ 1 µA (VCELL(ALL) < VPROTECT)
  • Low leakage current per cell input < 100 nA
  • Small package footprint
    • 8-pin WSON (2.00 mm x 2.00 mm)

The BQ2947 family is an overvoltage monitor and protector for Li-Ion battery pack systems. Each cell is monitored independently for an overvoltage condition.

In the BQ2947 device, an external delay timer is initiated upon detection of an overvoltage condition on any cell. Upon expiration of the delay timer, the output is triggered into its active state (either high or low, depending on the configuration). The external delay timer feature also includes the ability to detect an open or shorted delay capacitor on the CD pin, which will similarly trigger the output driver in an overvoltage condition.

For quicker production-line testing, the BQ2947 device provides a Customer Test Mode with 67 reduced delay time.

The BQ2947 family is an overvoltage monitor and protector for Li-Ion battery pack systems. Each cell is monitored independently for an overvoltage condition.

In the BQ2947 device, an external delay timer is initiated upon detection of an overvoltage condition on any cell. Upon expiration of the delay timer, the output is triggered into its active state (either high or low, depending on the configuration). The external delay timer feature also includes the ability to detect an open or shorted delay capacitor on the CD pin, which will similarly trigger the output driver in an overvoltage condition.

For quicker production-line testing, the BQ2947 device provides a Customer Test Mode with 67 reduced delay time.

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Technical documentation

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Type Title Date
* Data sheet BQ2947 Overvoltage Protection for 2-Series to 4-Series Cell Li-Ion Batteries with External Delay Capacitor datasheet (Rev. J) 19 May 0202
Technical article How active and passive cell balancing works 05 Oct 2016

Design & development

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Reference designs

TIDA-00553 — Multi-Cell Battery Manager Unit with Integrated Charging, Gauging, Authentication and Protection

The Texas Instruments bq40z60 device is a Battery Pack Manager that integrates battery charging control output, gas gauging, and protection for completely autonomous operation of 2-series to 4-series cell Li-Ion and Li-Polymer battery packs. The architecture enables internal communication between (...)
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WSON (DSG) 8 View options

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