ISL6247CR-T

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The ISL6247CR-T is an adjustable synchronous buck controller IC, developed by Intersil Corporation, which offers synchronous, step-down DC-DC power conversion with a wide input voltage range. The ISL6247CR-T is designed to be implemented for portable and other space-limited applications requiring up to 4A of output current and up to 40V of input voltage. It is packaged in a tiny SOT666 package and requires few external components, making it a cost-effective, compact solution for a range of applications.

The ISL6247CR-T uses a synchronous buck topology, where two power transistors are driven in a 180° out-of-phase configuration, resulting in an efficient, compact, and fast response performance. Two input-voltage ranges are available, with a wide range of 2.5V to 40V or a standard range of 2.5V to 28V. The package is pre-programmed to support fixed output voltages ranging from 0.8V to 5.0V in 50mV steps. Additional features include low shutdown current, wide dimming range, programmable soft-start, programmable over/under voltage lockout levels, as well as programmable loop compensation.

The ISL6247CR-T is suitable for a variety of applications. It can be used in industrial automation and motor systems to power motors, sensors, and smaller micro-controllers. It can also be used in embedded circuits, including gateways, ASICs, GPUs, FPGAs, DSPs, and SOCs, as well as various battery-operated devices.

The main areas of application for the ISL6247CR-T are in controlling non-isolated step-down applications, such as regulated power supplies, point-of-load power supplies, and automotive infotainment systems. It is also used in computing and storage applications, such as notebook PCs, server systems, and storage systems.

The working principle of the ISL6247CR-T is based on pulse-width modulation (PWM), as used in many DC-DC switching controllers. The PWM signal is generated by an oscillator with a programmable frequency (typically in the range of 200kHz to 1.4MHz). The PWM signal is used to control two power stages, consisting of two series-connected transistors. This technique allows for a higher output current and better efficiency when compared to linear regulators.

The output voltage is determined by a voltage divider, which consists of two resistors connected between the output of the controller and ground. The divider ratio is determined by the value of the resistors and can be adjusted to achieve the desired output voltage.

In summary, the ISL6247CR-T is an adjustable synchronous buck controller IC that offers a wide input voltage range, up to 4A of output current, and a tiny SOT666 package. It is suitable for non-isolated step-down applications, such as regulated power supplies, point-of-load power supplies, automotive infotainment systems, notebook PCs, server systems, and storage systems. The operating principle is based on the PWM technique, with a programmable frequency between 200kHz and 1.4MHz, and the output voltage is determined by a voltage divider.

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