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Home > Embedded ICs > Embedded - Microcontroller Unit (MCU) > BQ29209DRBR
Texas Instruments

BQ29209DRBR

BQ29209DRBR

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BQ29209DRBR Overview

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 30mV or more and stops when the difference is nominally 0 mV. Cell balancing is enabled and disabled by the CB_EN pin.

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 15mA
  • 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

Specifications

Circuit Diagram

BQ29209DRBR

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