ISL78268ARZ-T

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The ISL78268ARZ-T is a high-performance, high-efficiency current-mode synchronous buck DC-DC switching controller, designed to reduce the power dissipation and enable highest performance, highest efficiency voltage conversion applications. With its wide input voltage range, the ISL78268AFT-T can accelerate system performance with the greatest amount of power, while providing maximum efficiency, while also reducing system power consumption.

The ISL78268ARZ-T is designed specifically for high current, low voltage applications. It provides very accurate current and voltage feedback, as well as support for current mode operation and flexibility to change the operating frequency up to 500kHz. With a maximum current capability of up to 28A, it can be used to drive higher power DC-DC converters and any low-cost, high-efficiency buck converter.

The ISL78268ARZ-T uses a constant current source topology. The internal Switch-Voltagecurrent (VSC) circuit senses the voltage drop across an integrated current sensing resistor to regulate the current. It is designed to accurately limit the output current while maintaining a high level of efficiency. The improved loop bandwidth compensates the output voltage ripple and provides tight voltage accuracy with fast transient response.

The ISL78268ARZ-T provides a wide range of features including a wide input voltage range, a programmable operating frequency range of up to 500kHz, adjustable soft start function, and options for active/standby modes, hysteretic/voltage-mode control, and synchronous rectification.

In addition, the small 8-lead QFN packages of the ISL78268ARZ-T are easy to solder making it a suitable choice for space-constrained applications. The device also features thermal shutdown, cycle-by-cycle current limiting, programmable peak current and voltage protection, under voltage lockout and enable pin.

In conclusion, the ISL78268ARZ-T is a versatile, high-performance, high-efficiency DC-DC switching controller designed specifically to be used in high current, low voltage applications. It offers wide input voltage range, adjustable operating frequency range, adjustable soft start, active/standby modes, and other features, which makes it an ideal choice for powering low-cost, high-efficiency buck converters.

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