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Product details

Parameters

Function Protection Number of series cells (Min) 2 Number of series cells (Max) 2 Communication interface No Communication Features 2-series cell secondary protection, Over-voltage (OV), Cell balancing Typical operating current (Typ) (uA) 3 Rating Catalog Vin (Max) (V) 10 open-in-new Find other Battery protectors

Package | Pins | Size

VSON (DRB) 8 9 mm² 3 x 3 open-in-new Find other Battery protectors

Features

  • 2-Series Cell Secondary Protection
  • Automatic Cell Imbalance Correction with External
    Enable Control
    • ±30-mV Enable, 0-mV Disable Thresholds
      Typical
  • External Capacitor-Controlled Delay Timer
  • External Resistor-Controlled Cell Balance Current
  • Low Power Consumption ICC < 3 µA Typical
    (VCELL(ALL) < VPROTECT)
  • Internal Cell Balancing Handles Current
    up to 15 mA
  • External Cell Balancing Mode Supported
  • High-Accuracy Overvoltage Protection:
    • ±25 mV with TA = 0°C to 60°C
  • Fixed Overvoltage Protection Thresholds:
    4.30 V, 4.35 V
  • Small 8L DRB Package
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Description

The bq2920x device is a secondary overvoltage protection IC for 2-series cell lithium-ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit and automatic cell imbalance correction.

The voltage of each cell in a 2-series cell battery pack is compared to a factory programmed internal reference voltage. If either cell reaches an overvoltage condition, the OUT pin changes from low to high state.

The bq2920x can perform automatic voltage-based cell imbalance correction. Balancing can start when the cell voltages are different by nominally 30 mV or more and stops when the difference is nominally 0 mV. Cell balancing is enabled and disabled by the CB_EN pin.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet bq2920x Voltage Protection with Automatic Cell Balance for 2-Series Cell Li-Ion Batteries datasheet (Rev. C) Mar. 01, 2016
Technical articles Cell Balancing: Better safe than sorry (Part 1) Mar. 11, 2014

Design & development

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SON (DRB) 8 View options

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