ISL6521IBZ

Overview

The ISL6521IBZ is a switching controller designed for synchronous buck converters, intended to regulate low-voltage supplies requiring high current, such as processor cores. It integrates three linear controllers for system voltages like I/O and memory. Operating at a 300 kHz frequency with voltage-mode control, it supports a 4.5 V to 5.5 V input range. The device provides protection features including overcurrent, thermal, and undervoltage lockout. It is housed in a 16-lead SOIC package and operates within a -40°C to +85°C temperature range.

Feature Summary

• Integrates one synchronous PWM buck controller and three linear regulators for comprehensive power management
• Provides hardware-based protection against overcurrent, thermal overload, and undervoltage conditions
• Supports voltage-mode control for stable regulation of high-current core loads

Applications

• FPGA core voltage regulation
• ASIC power supply control
• Processor core voltage monitoring and control

Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm RoHS compliance and moisture sensitivity levels before storage. Review datasheet for specific handling requirements and verify pin compatibility during integration. Ensure environmental specifications match operational constraints.

Selection Notes

Select this component when a combined solution for high-current core voltage and auxiliary linear rails is required. Consider the 300 kHz switching frequency for balance between size and efficiency. Evaluate thermal performance given the integrated linear regulators. Verify that the 16-lead SOIC package fits the board layout constraints.

Part Context

Part of the ISL6521 series from Renesas/Intersil, focusing on multi-rail power control. The IBZ suffix indicates industrial temperature range operation. This model combines switching and linear regulation capabilities, distinguishing it from pure PWM controllers or standalone LDOs in the broader portfolio.

Replacement Considerations

ISL6521CBZ-T

FAQ

What is the primary function of the integrated linear controllers?

They regulate lower-current system voltages such as I/O and memory circuits, complementing the main buck converter.

Does the ISL6521IBZ support synchronous rectification?

Yes, the integrated PWM controller is designed for synchronous rectified buck converter applications.