The ISL95858HRZ-T is a multi-phase PWM controller from Intersil (now Renesas). It's designed to provide highly efficient and precise voltage regulation for modern microprocessors and other high-performance computing devices. This controller supports various operating modes and provides comprehensive protection features to ensure system reliability.

Applications

• Notebook computers
• Desktop computers
• Server systems
• Graphics cards
• Voltage Regulator (VR) modules
• Embedded systems requiring precise voltage regulation

Features

• Multi-phase operation (typically up to 4 phases)
• Serial VID (SVID) interface for communication with CPUs
• Adaptive voltage positioning (AVP)
• Programmable switching frequency
• Overcurrent protection (OCP)
• Overvoltage protection (OVP)
• Undervoltage protection (UVP)
• Thermal monitoring and protection
• Remote sensing

Benefits

• High Efficiency: Multi-phase operation reduces current ripple and improves efficiency, especially at high load currents.
• Precise Voltage Regulation: AVP ensures accurate voltage regulation under varying load conditions, improving system stability and performance.
• CPU Compatibility: SVID interface allows for seamless communication with modern CPUs, enabling dynamic voltage adjustments for optimal power management.
• Robust Protection: Comprehensive OCP, OVP, and UVP features protect the system from damage due to electrical faults.
• Thermal Management: Thermal monitoring and protection features prevent overheating and ensure reliable operation.
• Remote Sensing: Compensates for voltage drops across PCB traces for accurate voltage regulation at the load.

Additional Details

The ISL95858HRZ-T uses a constant-frequency PWM modulation scheme. It integrates gate drivers for external MOSFETs, allowing for flexible selection of power stage components. The SVID interface complies with Intel's Serial Voltage ID specification, enabling dynamic voltage control based on CPU requirements. The controller supports various operating modes, including continuous conduction mode (CCM) and discontinuous conduction mode (DCM), allowing for optimization of efficiency at different load levels. The device is available in a small QFN package. The 'T' at the end of the part number often indicates tape and reel packaging.