High-voltage Li-ion batteries connect via 100-V high-side FET driver

February 02, 2016 // By Graham Prophet
Offering, according to Texas Instruments, unprecedented flexibility and power protection for advanced industrial battery applications, the bq76200 is presented as the first single-chip 100-V high-side FET driver for high-power lithium-ion battery applications, delivering advanced power protection and control.

The high-voltage solution efficiently drives high-side N-channel charge and discharge FETs in batteries commonly used in energy storage systems and motor-driven applications, including drones, power tools, and e-bikes.

Compared to typical 50-V low-side FET driver solutions, the 100-V high-side FET driver provides greater protection against possible inductive transient events in motor-driven applications, which can cause battery voltages to jump as much as 200% above normal. The bq76200 also helps maintain constant battery monitoring and enhanced system diagnostics – even when charging and discharging is disabled.

Features include;

Versatile supply voltage range: compatible with a variety of battery architectures, capacities and voltage ranges from 8-V to 75-V, with an absolute maximum of 100-V.

Advanced-protection FET control: a fast-switching feature minimises fault response time and disables the discharge FET if a battery has been severely discharged.

Quick development time and reduced overhead: the adaptable driver works with small to large power FET arrays by simply scaling the charge-pump capacitor, reducing engineering overhead and speeding development time.

High integration and small package size: the bq76200 integrates a high-voltage charge pump and dual FET drivers into one 5 x 4.4 x 1-mm thin shrink small outline package (TSSOP).

The bq76200 can be used in conjunction with the bq76940 battery-monitoring family, allowing for the application to move to a high-side FET drive and ensure that communication is always possible. The bq76200 can also drive TI’s CSD19531Q5A 100-V NexFET power MOSFET as showcased in the bq76200 evaluation module .

The bq76200, in a 16-pin TSSOP, is priced at $1.69 (1000). Other support material includes; blog post, “ Why high-side vs. low-side FET switching matters ” and videos, “ TI’s bq76200 100V Battery High-Side FET Driver ” and “ Introduction to the bq76200 EVM

Texas Instruments; www.ti.com/bq76200-pr