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Buck controller takes on automotive, industrial apps

06 Aug 2014

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Intersil Corporation developed the ISL78268 55V synchronous buck controller with 3A integrated high side and low side drivers.

The ISL78268 buck controller provides step-down efficiency for a wide variety of load currents from under 5A to over 25A, enabling it to support virtually every 12V, 24V, or 48V 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 optimisation balance.

 ISL78268 buck controller

The ISL78268 buck controller enables easy conversion from high primary rails (typically 12V, 24V, or 48V) to lower secondary rails (typically 3.3V, 5V, 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 minimising 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.

Pricing for the ISL78268 buck controller starts at $2.45 in 1,000-unit quantities. The ISL78268 is offered in a 24 lead 4mm x 4mm QFN package. The ISL78268 is supported by the ISL78268EVAL1Z, evaluation kit available for $83.33 each.

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