BQ7693003DBT datasheet(49/63 Pages) TI1

49 / 63 page

bq76920, bq76930, bq76940

www.ti.com

SLUSBK2F – OCTOBER 2013 – REVISED NOVEMBER 2015

Power Supply Recommendations

The bq769x0 devices are powered through the BAT and REGSRC pins but the bq76930 and bq76940

have additional ‘Power’ pins to provide the power to the entire device in the higher cell configurations.

The use of Rf and Cf connected to the BAT pin, noted in the typical application diagrams, are required to

filter system transients from disturbing the device power supply. These components should be placed as

close as to the IC as possible.

Additionally, for the bq76930 and bq76940 there are additional requirements to ensure a stable power

supply to the device. The REGSRC pin is powered through a source follower circuit where the FET is

used to provide current for REGSRC from the battery positive terminal while reducing the voltage to a

suitable value for the IC. The FET also dissipates the power resulting from the load current and dropped

voltage external to the IC and care should be taken to ensure the correct dissipation ratings are specified

by the chosen FET.

The bq76920 does not use a FET because the battery voltage is within the REGSRC range.

Power Supply Recommendations

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Product Folder Links: bq76920 bq76930 bq76940

BQ7693003DBT Datasheet(PDF) 49 Page - Texas Instruments