BQ29209-Q1 Automotive voltage protection with automatic cell balance for 2-cell li-ion batteries, OVP=4.30V | TI.com

BQ29209-Q1 (ACTIVE) Automotive voltage protection with automatic cell balance for 2-cell li-ion batteries, OVP=4.30V

 

Description

The BQ29209-Q1 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 BQ29209-Q1 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.

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 threshold:
    4.30 V
  • Small 8L DRB package
  • Automotive-qualified AEC Q100 grade two

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Parametrics

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Part number Order Function Number of series cells (Min) Number of series cells (Max) Communication interface Features Typical operating current (Typ) (uA) Rating Vin (Max) (V) Package Group Approx. price (US$)
BQ29209-Q1 Order now Protection     2     2     No Communication     Cell Balancing
Over-voltage (OV)    
3     Automotive     16     SON | 8     0.35 | 1ku    
BQ29200 Order now Protection     2     2     No Communication     Cell Balancing
Over-voltage (OV)    
3     Catalog     10     SON | 8     0.30 | 1ku    
BQ29209 Order now Protection     2     2     No Communication     Cell Balancing
Over-voltage (OV)    
3     Catalog     10     SON | 8     0.30 | 1ku