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1 Features

? 2-series, 3-series, and 4-series

cell overvoltage protection (OVP)

? Factory programmed OVP threshold (3.6V to 5.2V)

with ±12mV accuracy

? Fixed delay timer to trigger FET drive output

(0.25s to 6.5s options)

? Output pin options:

– Active high

– Open-drain - active pulldown

– Open-drain - inactive pulldown

? Integrated 3mA regulated output programmable to

3.8V, 3.3V, 3.15V, 3.0V, 2.5V, 1.8V, or 1.5V

? Factory programmed undervoltage (UV) detection

threshold (1V to 4.15V) to disable regulator

– OVP remains operational even in undervoltage

condition

? Multiple power modes:

– NORMAL mode - no OV or UV: ICC ? 1.23μA

– Undervoltage mode - UV detected: ICC ?

0.25μA

– Overvoltage mode - OV detected: ICC ? 19μA

? Low leakage current per cell input < 100nA

? Small package footprint

– 8-Pin WSON (2mm × 2mm)

2 Applications

? Notebook PC

? Ultrabooks

? Portable medical electronics

? UPS battery backup systems

3 Description

The BQ2969 family is a high-accuracy, low-power

overvoltage protector with a 3mA regulated output

supply for Li-ion and LiFePO4 (LFP) 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, the output pin

is triggered into an active state to indicate that an

overvoltage condition has occurred.

The regulated output supply delivers up to 3mA output

current to drive always-on circuits, such as a real-time

clock (RTC) oscillator. The BQ2969 family has a selfdisable

function to turn off the regulated output if any

cell voltage falls below a programmable undervoltage

threshold, thereby preventing drain on the battery.

The BQ2969 family provides exceptionally low

power operation, drawing only 1.23μA during normal

operation (excluding regulator load current), and

dropping to 0.25uA when in an undervoltage

condition. Even when in the undervoltage state, the

device can still detect an overvoltage condition on any

other cell (which can occur in an imbalanced pack)

and can assert the output pin.