Renesas ISL95818HRTZ-T

Overview

ISL95818HRTZ-T from Renesas (formerly Intersil) is a 3-phase PWM controller for Intel VR12.5 and VR12.6+ CPU core power delivery, featuring R3™ modulation, 0.5% system voltage accuracy over temperature, integrated dual gate drivers, and configurable 1-/2-/3-phase operation. It supports lossless DCR current sensing with NTC compensation and differential remote voltage sensing for notebook and desktop VRMs.

For engineers reviewing the ISL95818HRTZ-T datasheet, ISL95818HRTZ-T pinout, ISL95818HRTZ-T application, or ISL95818HRTZ-T equivalent, key selection criteria include VR12.5/VR12.6+ compliance, R3™ transient response, programmable ICCMAX/slew rate, DCR vs. resistor current sensing flexibility, and phase reconfiguration capability without hardware change.

Technical Context

The ISL95818HRTZ-T implements Intersil's Robust Ripple Regulator (R3™) technology, enabling variable switching frequency during load transients and automatic frequency scaling at light load to improve efficiency. Its PWM modulator achieves faster transient settling than conventional fixed-frequency controllers.

It integrates two high-side gate drivers and controls one external phase via dedicated driver interface; supports serial bus communication with CPU for VID updates and telemetry; and provides adaptive body diode conduction time reduction to minimize shoot-through losses in synchronous buck stages.

Key Specifications

Pinout & Package

ISL95818HRTZ-T is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are validated per Renesas ISL95818 datasheet Rev. 3.00 (2013).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiphase CPU VRM controller applications.

Compared with IR35201MTRPBF and MP8765GQ-Z, the ISL95818HRTZ-T uniquely delivers full VR12.6+ compliance, R3™ modulation for superior transient response, and flexible phase scalability - making it the only option among the three qualified for next-generation Intel mobile and desktop CPU VRMs requiring serial telemetry and adaptive efficiency control.

Availability

ISL95818HRTZ-T is available at Aetrix Electronics and suitable for notebook CPU VRMs, desktop motherboard power delivery, and embedded computing platforms requiring stable component supply and long-term lifecycle support.

Supply support for ISL95818HRTZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio.

The ISL95818HRTZ-T belongs to Renesas' Computing Power VRM/IMVP product line, engineered specifically for Intel-compatible microprocessor core voltage regulation with emphasis on VR12.5/VR12.6+ compliance, transient performance, and thermal-aware current sensing.

FAQ

What is the supported input voltage range for the ISL95818HRTZ-T?

The ISL95818HRTZ-T supports an input voltage range of 4.5V to 25V, enabling use in both 12V and higher-voltage adapter-fed systems common in modern notebooks and desktops. This wide VIN range accommodates varying platform power architectures while maintaining stable regulation of the CPU core voltage. The ISL95818HRTZ-T internally regulates auxiliary rails from this input, ensuring robust operation across the full specified range.

Does the ISL95818HRTZ-T support VR12.6+ compliance out of the box?

Yes, the ISL95818HRTZ-T is fully compliant with Intel VR12.6+ specifications, including serial VID interface, extended telemetry registers, dynamic load-line programming, and required fault response timing. It requires no firmware update or external configuration to meet VR12.6+ requirements. The ISL95818HRTZ-T implements these features in hardware, ensuring seamless integration into VR12.6+-certified motherboard designs.

How does the R3™ modulation in the ISL95818HRTZ-T improve transient response?

The R3™ modulation in the ISL95818HRTZ-T enables variable switching frequency during load transients, allowing immediate adjustment of duty cycle and frequency to suppress voltage deviation. This results in sub-10µs transient settling time-significantly faster than fixed-frequency controllers. The ISL95818HRTZ-T leverages this architecture to maintain tight regulation during CPU turbo boost events without requiring oversized output capacitance.

Can the ISL95818HRTZ-T be configured for single-phase operation?

Yes, the ISL95818HRTZ-T supports programmable 1-, 2-, or 3-phase configurations via external resistor settings and serial bus commands. In single-phase mode, it drives one high-side/low-side pair using its internal drivers, simplifying VRM design for low-power CPUs or auxiliary rails. The ISL95818HRTZ-T retains full feature set-including remote sensing, current monitoring, and slew rate control-in all phase modes.

What current sensing methods does the ISL95818HRTZ-T support?

The ISL95818HRTZ-T supports two validated current sensing methods: lossless inductor DCR sensing with integrated NTC thermistor compensation for temperature drift correction, and precision resistor (shunt) sensing with differential amplification. Both methods feed into the same IMON output and OCP circuitry. The ISL95818HRTZ-T automatically adapts gain and offset calibration based on selected method, ensuring consistent accuracy across operating conditions.