Renesas ISL6566IR

Overview

ISL6566IR from Intersil is a three-phase buck PWM controller with integrated high- and low-side MOSFET drivers, designed for precision core voltage regulation in Intel VRM9/VRM10 and AMD Hammer microprocessor power delivery systems. It supports -40°C to +85°C operation, delivers ±0.5% system accuracy over temperature, enables DCR- and rDS(ON)-based current sensing, and provides programmable 225–275 kHz switching frequency per phase.

For engineers reviewing the ISL6566IR datasheet, ISL6566IR pinout, ISL6566IR application, or ISL6566IR equivalent, this page details its multi-phase control architecture, differential remote sensing, channel-current balancing via dual-sensing methodology, load-line droop programming, and thermal protection features critical for server CPU and high-performance computing power supplies.

Technical Context

The ISL6566IR implements interleaved three-phase PWM control with adaptive non-overlap timing (10 ns UGATE/LGATE turn-on delay), integrated gate drivers supporting 5–12 V PVCC bias, and a unified error amplifier with 96 dB DC gain and 20 MHz gain-bandwidth product. Its VID decoder accepts 5-bit or 6-bit inputs and selects between VRM9, VRM10, or AMD Hammer DAC tables based on VRM10 and VID12.5 pin states.

Current sensing combines lossless inductor DCR sampling (for load-line positioning and overcurrent protection) with rDS(ON) sampling (for per-channel current balance), both referenced to IREF/ISUM/ICOMP nodes. Protection includes multi-tiered overvoltage clamping, undervoltage lockout at 82% VID, open-sense-line detection, and thermal shutdown at 160°C with 100°C recovery hysteresis.

Key Specifications

Pinout & Package

ISL6566IR is housed in a 40-lead 6×6 mm QFN package (PKG DWG # L40.6x6) with exposed thermal pad. Pin functions are validated per FN9178 Rev 4.00 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar three-phase buck controller applications.

Compared with ISL6566CR, the ISL6566IR extends operational range to -40°C to +85°C without sacrificing accuracy or feature set; compared with RT8803AZSP, it delivers superior efficiency and layout simplicity via integrated DCR sensing and no external shunts.

Availability

ISL6566IR is available at Aetrix Electronics and suitable for server CPU power delivery, workstation GPU core supply, AMD Hammer-based desktop platforms, and VRM10-compliant embedded systems requiring stable component supply across extended temperature ranges.

Supply support for ISL6566IR 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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and power management ICs for computing, industrial, and communications markets.

The ISL6566IR belongs to Intersil's VRM/VRD controller product line, engineered specifically for high-efficiency, multi-phase core voltage regulation in advanced microprocessor platforms with stringent accuracy and thermal requirements.

FAQ

What is the operating temperature range of the ISL6566IR?

The ISL6566IR is rated for ambient operation from -40°C to +85°C, making it suitable for industrial and enterprise server applications where extended thermal margins are required. This range is confirmed in the Ordering Information table on page 2 of FN9178 Rev 4.00 and distinguishes it from the commercial-grade ISL6566CR (0°C to +70°C). The ISL6566IR maintains ±0.5% system accuracy across this full range.

How does the ISL6566IR implement current sensing for overcurrent protection and channel balancing?

The ISL6566IR uses two independent current sensing methods: lossless inductor DCR sensing (via ISUM/IREF/ICOMP pins) for load-line droop and overcurrent protection, and rDS(ON) sensing (via ISEN1–3 pins) for per-phase current balancing. DCR sensing avoids power loss and enables accurate system-level current measurement, while rDS(ON) leverages the MOSFET's intrinsic resistance for precise channel matching without added components. Both are validated in the Electrical Specifications and Functional Pin Description sections of FN9178.

Which microprocessor standards does the ISL6566IR support via its VID interface?

The ISL6566IR supports Intel VRM9.0, Intel VRM10.0, and AMD Hammer voltage identification standards through configurable VID decoding. Selection is determined by the logic states of the VRM10 and VID12.5 pins per Table 1 in FN9178 Rev 4.00: VRM10 high enables VRM10.0 mode; VRM10 low + VID12.5 high selects VRM9.0; VRM10 low + VID12.5 low selects AMD Hammer. All VID tables (Tables 2–4) are included in the datasheet.

Does the ISL6566IR require external MOSFET drivers?

No, the ISL6566IR integrates high-side and low-side MOSFET drivers for all three phases, eliminating the need for external driver ICs. Each phase includes dedicated UGATE and LGATE outputs with adaptive non-overlap timing (10 ns minimum), gate drive sink/source resistance specified at 0.6–3.0 Ω, and support for 5–12 V PVCC bias. This integration reduces component count, PCB area, and layout complexity versus controller+driver split architectures.

What protection features are built into the ISL6566IR?

The ISL6566IR includes overvoltage protection (OVP) with clamping action via lower-FET turn-on, undervoltage protection (UVP) triggered at 82% of VID, open-sense-line detection (VDIFF threshold of VDIFF + 0.9–1.1 V), thermal shutdown at 160°C with 100°C hysteresis, and programmable overcurrent protection via OCSET pin. These protections are detailed in the Absolute Maximum Ratings, Electrical Specifications, and Functional Pin Description sections of FN9178 Rev 4.00.