bq296103 2-4S Overvoltage Protector with LDO Outpu

By Texas Instruments 55

bq296103 2-4S Overvoltage Protector with LDO Outpu

Texas Instruments' bq296xyz family is a high accuracy, low power overvoltage protector with a 1 mA regulated output supply for Li-Ion battery pack applications.

Each cell in a 2-series to 4-series cell stack is individually monitored for an overvoltage condition. An internally fixed-delay timer is initiated upon detection of an overvoltage condition on any cell; upon expiration of the delay timer, an output pin is triggered into an active state to indicate that an overvoltage condition has occurred.

The regulated output supply delivers up to 1 mA (maximum) output current to drive always-on circuits, such as a real-time clock (RTC) oscillator. The bq296xyz family has a self-disable function to turn off the regulated output if any cell voltage falls below a certain threshold, thereby preventing drain on the battery, and provides an external control to enable or disable the regulated output.

Features
  • 2-, 3-, and 4-series cell overvoltage protection (OVP)
  • Fixed delay timer to trigger FET drive output  (3-s, 4-s, 5.5-s, or 6.5-s options)
  • Factory programmed OVP threshold (threshold range 3.85 V to 4.6 V)
  • Output options: active high
  • High-accuracy overvoltage protection: ±10 mV
  • Regulated supply output (3.3 V, 2.5 V, 1.8 V options) with self-disable and/or external enable/disable control
  • Extra low power consumption with REG output disabled, ICC ∼ 1.2 µA
  • Low leakage current per cell input < 100 nA
  • Small package footprint
    • 8-pin WSON (2 mm × 2 mm)
  • Low power consumption ICC ≈ 4 µA (VCELL(ALL) < VPROTECT)

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