ISL6524CB

Special Purpose Regulators Overview

The ISL6524CB is a switching controller designed for Intel VRM8.5 applications, featuring four outputs within a 28-SOIC package. It operates with an input voltage range of 10.8V to 13.2V and supports multiple output voltages including 1.2V, 1.5V, 1.8V, and adjustable ranges from 1.05V to 1.825V. The device delivers up to 25A output current with a switching frequency of 215 kHz and a maximum duty cycle of 100%. It functions within a temperature range of 0°C to +70°C.

Special Purpose Regulators Feature Summary

• Integrates power control and protection for four distinct output voltages in high-performance microprocessor systems.
• Includes one PWM controller for synchronous-rectified buck conversion and three linear controllers for system bus power.
• Provides Intel VRM8.5 compatible regulation with precision reference and voltage-mode control for static accuracy.

Special Purpose Regulators Applications

• Intel VRM8.5 compliant microprocessor core voltage regulation
• Computer system AGTL+ 1.2V bus power supply
• 1.5V AGP power regulation

Special Purpose Regulators Procurement Notes

Verify component status as the ISL6524CB is listed as obsolete or discontinued by major distributors. Confirm availability through Renesas Electronics legacy channels or authorized partners. Ensure compliance with RoHS requirements if applicable, as specific variants may not meet current environmental standards. Validate lead times for remaining stock or alternative sourcing options.

Special Purpose Regulators Selection Notes

Select this component for designs requiring Intel VRM8.5 compatibility and integrated multi-rail power management. Consider the 28-SOIC package constraints and thermal performance for 25A applications. Evaluate the need for external components required by the linear regulators and PWM controller. Verify that the 215 kHz switching frequency aligns with system EMI and efficiency targets.

Special Purpose Regulators Part Context

The ISL6524CB belongs to the Intersil (now Renesas) ISL6524 series, specialized for CPU power sequencing. It consolidates complex power delivery functions into a single IC, reducing board space compared to discrete solutions. This series was widely used in desktop and server platforms during the VRM8.5 era.

Special Purpose Regulators Replacement Considerations

Check Renesas product legacy documents for direct substitutes. Variants like ISL6524ACBZ or ISL6524CB-T may offer different packaging or compliance statuses. Newer VRM generations may require updated controllers with higher current capabilities or digital interfaces.

Special Purpose Regulators FAQ

What is the primary function of the linear controllers in the ISL6524CB?

The three linear controllers regulate power for specific system buses, such as the 1.2V AGTL+ bus and 1.5V AGP rails, complementing the main PWM controller.

How is the microprocessor core voltage regulated?

It is regulated via a synchronous-rectified buck converter controlled by the internal PWM controller, supporting voltages from 1.050V to 1.825V in 25mV steps.