BQ40Z50-R1 datasheet(30/56 Pages) TI2

No de pièce	BQ40Z50-R1

Description	bq40z50-R1 1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager

PDF	56 Pages

Scroll/Zoom	100%

Fabricant	TI2 [Texas Instruments]

Site Internet	https://www.ti.com

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30 / 56 page

bq40z50-R1

SLUSCB3 – JULY 2015

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Figure 22. bq40z50-R1 Protection FETs

9.2.2.1.2

Chemical Fuse

The chemical fuse (Dexerials, Uchihashi, and so forth) is ignited under command from either the bq294700

secondary voltage protection IC or from the FUSE pin of the gas gauge. Either of these events applies a positive

voltage to the gate of Q5, shown in Figure 23, which then sinks current from the third terminal of the fuse,

causing it to ignite and open permanently.

It is important to carefully review the fuse specifications and match the required ignition current to that available

from the N-channel FET. Ensure that the proper voltage, current, and Rds(on) ratings are used for this device.

The fuse control circuit is discussed in detail in FUSE Circuitry.

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