1 Features
• 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 (BQ2961)
– Options: 3.3 V, 3.15 V, 3.0 V (BQ2962)
• Low power consumption ICC ~ 4 μA
(VCELL(ALL) < VPROTECT)
• 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)
2 Applications
• Notebook PC
• Ultrabooks
• Medical
• UPS battery backup
3 Description
The BQ296xxx family is a high-accuracy, low-power
overvoltage protector with a 2-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 2-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.