V

OV

V

HYS

OUT (V)

t

DELAY

–

OUT

V1

VSS

VDD

OSC

Delay

Timer

PACK +

PACK –

INT_EN

REG

PWRPAD

7

bq294602, bq294604, bq294682, bq294624

www.ti.com

SLUSAS0D – DECEMBER 2011 – REVISED APRIL 2017

Product Folder Links: bq294602 bq294604 bq294682 bq294624

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Copyright © 2011–2017, Texas Instruments Incorporated

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

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

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

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.