ISL6522IRZ-TS2698

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The ISL6522IRZ-TS2698 is a state-of-the-art DC/DC switching controller for distributed power systems. It is designed to provide high efficiency, fast dynamic response, accurate load regulation and fault protection for multiple output distributed power systems. The IC supports design of flexible, fault-tolerant, scalable system architectures which provide flexibility to adapt to changing system requirements over time and deployment environment. The ISL6522IRZ-TS2698 is compatible with both synchronous and asynchronous buck and buck-boost switching regulators, enabling multi-phase operation for systems requiring high power with limited area requirements.

Features

• Synchronous/Asynchronous Buck and Buck-Boost support
• 2-phase support with integrated MOSFET Gate Drivers
• Integrated voltage supervisor
• Input overvoltage protection
• Power good indicator
• Current mode control with Auto-phasing
• Spread spectrum frequency modulation
• Digitized error amplifier
• Two selectable oscillator clocks

Application Field

The ISL6522IRZ-TS2698 is designed for use in both distributed power architectures and microprocessor core/graphics power systems with multiple outputs. The controller provides the flexibility needed to implement efficient designs for high current load applications, and can be used to configure systems that support various load policies including programmable sequencing, non-volatile tracking, and adjustable rail current delivery.

The controller can be used in conjunction with the ISL6522-TSCT to manage high power microprocessors with up to 8 rail steps. This allows the processor power supply to be spread across multiple output converters and manage peak and average rail current. The controller provides the flexibility to reduce output noise and ripple by adjusting feedback loop bandwidth and spreading high frequency current pulses across different switch nodes.

Working Principle

The ISL6522IRZ-TS2698 controller uses current mode control to provide fast dynamic response and accurate load regulation. The controller features an integrated PWM core, enabling switching frequency and margin tracking settings to be easily programmed via a simple spreadsheet. The controller also features an integrated voltage supervisor, which allows an off-chip logic to control the point at which the switching regulator should transition from pre-charge to normal operation.

The ISL6522IRZ-TS2698 also supports spread spectrum frequency modulation to reduce EMI. The controller provides two selectable oscillator clocks and is capable of frequency modulation over a wide range of frequencies. This allows designers to reduce peak power levels by spreading the noise energy over a larger frequency range.

The ISL6522IRZ-TS2698 also supports 2-phase operation for systems that require high peak power levels. In dual-phase mode, the controller operates as two independent controllers, with each output controlled by its own feedback loop and spread spectrum frequency modulation.

The ISL6522IRZ-TS2698 controller also provides extensive fault protection features, including input overvoltage protection and FAULT output pin. The FAULT output pin can signal a fault condition directly to an external logic circuit, allowing the controller to signal a potential fault before it becomes an actual problem. The controller also provides a power-good signal that monitors the current status of the output voltage. This signal can be used to signal when the rail is ready for load sharing or optimizing the power delivery across multiple rails.

The ISL6522IRZ-TS2698 is an ideal solution for high current load applications due its many features and benefits. It provides fast dynamic response, accurate load regulation, high efficiency, and fault protection for multiple output distributed power systems. With its integrated voltage supervisor and selectable oscillator clocks, it allows for flexible and fault-tolerant system architectures that can be adapted to changing system requirements over time and deployment environment.

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