BQ294604DRVR datasheet(7/21 Pages) TI1

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VOV

HYS

OUT (V)

DELAY

–

OUT

VSS

VDD

R VD

CVD

RIN

CIN

VOV

OSC

Delay

Timer

PACK +

PACK –

INT_EN

REG

PWRPAD

bq294602, bq294604, bq294682, bq294624

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SLUSAS0D – DECEMBER 2011 – REVISED APRIL 2017

Product Folder Links: bq294602 bq294604 bq294682 bq294624

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8 Detailed Description

8.1 Overview

The bq2946xx is a second-level overvoltage (OV) protector for a single cell. The cell voltage is compared to a

protection voltage threshold, VOV. The protection threshold is preprogrammed at the factory with a range from

3.85 V to 4.65 V. When the OVP is triggered, the OUT pin goes high to activate an external N-channel FET,

which conducts a low-impedance path to blow a fuse.

8.2 Functional Block Diagram

8.3 Feature Description

The method of overvoltage detection is comparing the cell voltage to an OVP threshold voltage VOV. Once the

cell voltage exceeds the programmed fixed value VOV, the delay timer circuit is activated. This delay (tDELAY) is

fixed for 4 seconds for the bq294602 device. When these conditions are satisfied, the OUT terminal is

transitioned to a high level. This output (OUT) is released to a low condition if the cell input (V1) is below the

OVP threshold minus the VHYS.

Figure 5. Timing for Overvoltage Sensing

8.3.1 Sense Positive Input for V1

This is an input to sense single battery cell voltage. A series resistor and a capacitor across the cell is required

for noise filtering and stable voltage monitoring.

BQ294604DRVR Datasheet(PDF) 7 Page - Texas Instruments

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