TI BQ30Z55 BQ30Z55DBTR BATTERY FUEL GAUGE

Производитель

TI

Номер в каталоге производителя

BQ30Z55DBTR

Категория продукта

BATTERY FUEL GAUGE

Лист данных

BQ30Z55 Серия

Изображение

Характеристики

The N-channel charge and discharge FETs must be selected for a given application. Most portable battery

applications are a good match for the Si7114DN. The Vishay Si7114DN is an 18.3-A, 30-V device with

Rds(on) of 7.5 mΩ when the gate drive voltage is 10 V.

If a precharge FET is used, R15 (in bq30z50) or R28 (in bq30z55) is calculated to limit the precharge

current to the desired rate. Be sure to account for the power dissipation of the series resistor. The

precharge current is limited to (Vcharger – Vbat)/R15 and maximum power dissipation is (Vcharger –

Vbat)2

/R15.

The gates of all protection FETs are pulled to the source with a high-value resistor between the gate and

source to ensure they are turned off if the gate drive is open.

Capacitors C16 and C17 help protect the FETs during an ESD event. The use of two devices ensures

normal operation if one of them becomes shorted. In order to have good ESD protection, the copper trace

inductance of the capacitor leads must be designed to be as short and wide as possible. Ensure that the

voltage rating of both C16 and C17 are adequate to hold off the applied voltage if one of the capacitors

becomes shorted.