ISL6840IU-T

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ISL6840IU-T Application Field and Working Principle

PMIC - Voltage Regulators - DC DC Switching Controllers

The ISL6840IU-T is a device used in the field of power management and is a member of the Intersil PSM series. ISL6840IU-T is an advanced controller with a single-phase synchronous buck PWM topology working in an open loop control system. This device designed to power microprocessors, memory and peripheral loads with an easy to use dual-mode weakly bounded frequency (low and adjustable frequency) operation. The device also offers a high-voltage removable loop for current-mode control for improved transient response. It can be powered from a single source, or multiple sources which can give the flexibility of a Multi-Rail option.

Compared to the traditional analog controllers, the ISL6840IU-T is implemented with a digitally enhanced control loop. To maximize transient response, it features adjustable peak current-mode control and external compensation. Besides, it’s also necessary to prevent over-voltage, under-voltage, over-temperature and over-current conditions from occurring. This feature is provided by an under-voltage lockout (UVLO) comparator, open loop protection (OLP) comparator, an adjustable temperature shutdown (TSD) comparator, and an over-current detection (OCD) timout circuit , respectively. Additionally, the device offers several functions, such as cycle-by-cycle current sensing for improved accuracy and dynamic current sharing for non-isolated application.

In terms of its application field, the ISL6840IU-T can be utilized in a variety of different systems. It is suitable for cyber physical system, cloud computing, communication, and power supply design, such as notebook PCs, desktop PCs and IOT systems. Also, it can be used in computing and storage systems, as well as server and storage applications.

The ISL6840IU-T has the capability to work in both constant frequency and constant on-time mode operation. In constant frequency mode, the PWM carrier frequency is selected by the external resistor connected to the CF pin. When sense voltage at the CF pin is between 0.3 and 0.7V. the oscillator frequency is selected. In both operating modes, it is also possible to select a power-saving mode or burst mode operation, depending on command level. Both operating modes offer great flexibility and compatibility to various applications.

Another great feature of the ISL6840IU-T is its integrated gate drive circuit. It includes both a high- and low-side driver that can be used to drive N-channel MOSFETs and IGBTs. The gate drive signals are isolated from the controller side, preventing the need for additional drive or isolation components. The gate drive also includes a ramp-up generator, a soft start and a shoot-through prevention feature.

The ISL6840IU-T features PMBus to provide an efficient, low-cost, scalable interface that is applicable across power management applications. It also provides a wide range of programmable features, such as output voltage setting, current limit setting, operating mode setting and various predefined operating modes. This highly configurable PMBus interface allows system designers to customize the device parameters according to their unique needs.

Overall, the ISL6840IU-T provide s a cost-effective solution for applications derived from cyber physical system, cloud computing and storage, communication, and power supply design. Its integrated features make it an ideal choice for a variety of applications, such as notebook PCs, desktop PCs and IOT systems. In addition, its PMBus interface makes it easy to customize the device settings by providing a wide range of programmable features.

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