1 Features

• Single-Cell Overvoltage Monitor for Secondary

Protection

• Fixed Programmable Delay Timer

• Fixed Overvoltage Protection (OVP) Threshold

– Available Range of 3.85V to 4.6V

• Fixed OVP Delay Option: 4s or 6.5s

• High-Accuracy OVP: ±10mV

• Low Power Consumption ICC approximately 1μA

(VCELL(ALL) < VPROTECT)

• Low Leakage Current per Cell Input < 100nA

• Small Package Footprint

– 6-Pin SON

2 Applications

• Second-level protection in Li-ion battery packs in:

– Tablets

– Slates

– Portable equipment and instrumentation

3 Description

The BQ2946xx family of products is a secondary-level

overvoltage monitor and protector for Li-Ion battery

pack systems. The cell is monitored for overvoltage

condition and triggers an internal counter once the

OVP threshold is exceeded; after a fixed set delay,

the out is transitioned to a high level. The output is

reset (goes low) if the cell voltage drops below the set

threshold minus the hysteresis.