BQ76PL455APFCT datasheet(95/125 Pages) TI1

95 / 125 page

CELL16

100

TOP

VSENSE16

To CELL15

VSENSE15

Back-to-back

signal diodes

0.1 µF

100

1 µF

6.2 V

90 V

bq76PL455A

www.ti.com

SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

Product Folder Links: bq76PL455A

Submit Documentation Feedback

Application Information (continued)

8.1.1.3 TOP and VSENSE16 Pins

To ensure that the voltage between TOP and VSENSE16 does not violate the Absolute Maximum Ratings and

Recommended Operating Conditions during hot-plug or other unusual conditions, connect the VSENSE16 input

(and any unused SENSE inputs) to the TOP pin using two back-to-back signal diodes. Select diodes with a high

enough current rating to withstand the continuous currents during a wire disconnect and the inrush currents

during hot plug. Use diodes that have a higher Vf, such as an ultra-fast or fast diode. Low Vf diodes, such as

Schottkey diodes, must not be used because noise on the TOP pin may couple onto the VSENSE16 pin (or

highest-sense line used).

The TOP input must also include a low-pass filter using a 0.1-µF capacitor and a 100-Ω to 300-Ω resistor to

avoid voltage stress during cell connection (hot-plug). Figure 26 illustrates the correct VSENSE-TOP connection.

Additionally, connect a transient suppression diode (TVS) to TOP to clamp the voltage to below 88 V and prevent

an overvoltage condition on TOP during hot-plug and other transient events.

Figure 26. Connecting the TOP and VSENSE16 Pins

8.1.1.4 AGND1 and VSENSE0 Pins

To ensure that the voltage between VSENSE0 and AGND1 does not violate the Absolute Maximum Ratings and

Recommended Operating Conditions during hot-plug or other unusual conditions, connect the VSENSE0 input to

the AGND1 pin using two back-to-back signal diodes. Select diodes with high enough current rating to withstand

the continuous currents during a wire disconnect and the inrush currents during hot plug. Use diodes that have a

higher Vf, such as an ultra-fast or fast diode. Low Vf diodes, such as Schottkey diodes, must not be used

because noise on AGND may couple onto the VSENSE0 input. Additionally, connect a 1-µF capacitor between

VSENSE0 and AGND1. Figure 27 illustrates the correct VSENSE0-to-AGND1 connection.

BQ76PL455APFCT Datasheet(PDF) 95 Page - Texas Instruments