New buck controller looks to support greater flexibility for high current designs

Intersil Corporation has announced the ISL78268 55V synchronous buck controller with 3A integrated high side and low side drivers. Described by the company as the most versatile high voltage buck solution available, the ISL78268 buck controller provides very high step-down efficiency for a wide variety of load currents from under 5 to over 25A, enabling it to support virtually every 12, 24, or 48 volt high current buck requirement for automotive and industrial applications.

For heavy load applications, designers often have to balance power conversion efficiency against size and noise constraints.  This requires making trade-offs among component selection, switching frequency, and output ripple and often requires the power stage to be tailored to the load in question. The ISL78268 buck solution was designed specifically to be flexible so that it can be used regardless of the optimization balance.

The ISL78268 buck controller enables easy conversion from high primary rails (typically 12, 24 or 48V) to lower secondary rails (typically 3.3, 5.0 or 12V).  It fully integrates both a peak current mode synchronous PWM controller and a dedicated constant current control loop as well as high-side and low-side FET drivers that have adaptive dead time control. The ISL78268 device’s tolerance of 55V inputs makes it ideal for automotive applications, including support for the 12V clamped load-dump specifications and new 48V power system being adopted by European OEMs. The integrated 3A driver allows the ISL78268 buck controller to sharply switch small power FETs or parallel combinations of large FETs while minimizing dead time to reduce switching losses, improve efficiency and reduce excess heat dissipation. This allows a single buck controller to be used across a wide variety of load requirements, simplifying design and reducing time-to-market.

“The ISL78268 was designed to enable power conversion with very high efficiency and improved performance over traditional solutions,” said Philip Chesley, vice president of Intersil’s Precision Products. “The unique combination of features provides customers with a very versatile solution that can be used and re-used across their high voltage designs.”

www.intersil.com

 

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