BQ2961 2-4S Overvoltage Protector with LDO Output |


2-4S Overvoltage Protector with LDO Output



The bq296xxx 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 (max) output current to drive always-on circuits, such as a real-time clock (RTC) oscillator. The bq296xxx 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.


  • 2-Series, 3-Series, 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 With Self-Disable and/or External Enable/Disable Control
    • Options: 3.3-V, 2.5-V, and 1.8-V (bq2960, bq2961)
    • Options: 3.3-V, 3.15-V, 3.0-V (bq2962)
  • Low Power Consumption ICC ≈ 4 µA
  • 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)

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Parametrics Compare all products in Battery protectors

Number of series cells (Min)
Number of series cells (Max)
Communication interface
Typical Operating Current (Typ) (uA)
Vin (Max) (V)
Package Group
Approx. price (US$)
BQ2961 BQ2962
Protection     Protection    
2     2    
4     4    
No Communication     No Communication    
Programmable EEPROM or EPROM
Over-voltage (OV)
Under-voltage (UV)    
Over-voltage (OV)
Under-voltage (UV)    
1     1    
Catalog     Catalog    
20     20    
WSON | 8     WSON | 8    
0.30 | 1ku     0.30 | 1ku