1 Features

• 2-, 3-, and 4-series cell overvoltage protection

• External capacitor-programmed delay timer

• Factory programmed OVP threshold (threshold

range 3.85 V to 4.6 V)

• Output options: active high or open drain active

low

• High-accuracy overvoltage protection: ±10 mV

• Low power consumption ICC ≈ 1 μA

(VCELL(ALL) < VPROTECT)

• Low leakage current per cell input < 100 nA

• Small package footprint

– 8-pin WSON (2.00 mm x 2.00 mm)

2 Applications

• Notebooks

• UPS battery backup

3 Description

The BQ2947 family is an overvoltage monitor and

protector for Li-Ion battery pack systems. Each cell is

monitored independently for an overvoltage condition.

In the BQ2947 device, an external delay timer is

initiated upon detection of an overvoltage condition on

any cell. Upon expiration of the delay timer, the output

is triggered into its active state (either high or low,

depending on the configuration). The external delay

timer feature also includes the ability to detect an

open or shorted delay capacitor on the CD pin, which

will similarly trigger the output driver in an overvoltage

condition.

For quicker production-line testing, the BQ2947

device provides a Customer Test Mode with 67

reduced delay time.