Renesas ISL95833HRTZ

Overview

ISL95833HRTZ from Renesas (formerly Intersil) is a dual 2+1-phase PWM controller IC for IMVP-7/VR12-compliant CPU and GPU core power supplies, featuring two integrated gate drivers, R3 modulator technology, 0.5% system voltage accuracy over temperature, and support for DCR/resistor current sensing.

For engineers reviewing the ISL95833HRTZ datasheet, ISL95833HRTZ pinout, ISL95833HRTZ application, or ISL95833HRTZ equivalent, key selection considerations include phase configurability (2- or 1-phase for VR1, fixed 1-phase for VR2), serial bus interface with CPU, differential remote sensing, programmable VBOOT, IMAX, and switching frequency, and adaptive body diode conduction control.

Technical Context

The ISL95833HRTZ implements two independent VR controllers sharing a single serial control bus (SVID) to communicate with Intel CPUs, enabling coordinated load-line regulation and dynamic voltage/frequency scaling. VR1 supports reconfigurable 2-phase or 1-phase operation with one integrated driver; VR2 is a dedicated 1-phase regulator with its own driver.

Both outputs use the Robust Ripple Regulator (R3) modulator, delivering variable-frequency operation during transients for faster response and improved light-load efficiency. Current sensing is configurable per output-either lossless DCR sensing with single NTC thermistor compensation or precision resistor-based sensing-with differential remote voltage sense on both channels.

Key Specifications

Pinout & Package

ISL95833HRTZ is housed in a 40-pin QFN package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Intersil FN7837 Rev 2.00 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual VR controller applications.

Compared with ISL95833HRTZ, ISL95838HRZ extends functionality for triple-rail systems while maintaining compatibility, whereas RT8803AZSP trades R3 performance for lower BOM cost - making ISL95833HRTZ the balanced choice for dual-rail IMVP-7/VR12 designs requiring verified transient response and accuracy.

Availability

ISL95833HRTZ is available at Aetrix Electronics and suitable for high-performance laptop motherboards, discrete GPU power stages, thin-and-light notebook VR designs, and IMVP-7/VR12-compliant embedded computing platforms requiring stable component supply and long-term lifecycle support.

Supply support for ISL95833HRTZ 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 for computing, industrial, and automotive markets.

The ISL95833HRTZ belongs to Renesas' IMVP-7/VR12-compliant CPU power controller product line, engineered specifically for efficient, accurate, and responsive core voltage regulation in Intel-based client platforms.

FAQ

What is the primary function of the ISL95833HRTZ in a CPU power delivery system?

The ISL95833HRTZ serves as a dual-output PWM controller managing both VCORE (VR1) and GPU (VR2) voltage regulation in IMVP-7/VR12-compliant systems. It integrates two gate drivers, implements R3 modulator technology for fast transient response, and communicates with the CPU via SVID bus to deliver precise, dynamically scaled voltages with ±0.5% accuracy. Its dual-VR architecture replaces two discrete controllers, reducing board space and complexity in modern laptop and desktop platforms.

Does the ISL95833HRTZ support both DCR and resistor-based current sensing?

Yes, the ISL95833HRTZ supports both sensing methods per output: lossless inductor DCR sensing with single NTC thermistor compensation for temperature drift correction, and precision resistor-based sensing for higher accuracy where DCR variation is unacceptable. Each VR (VR1 and VR2) allows independent selection, enabling designers to optimize for cost, layout constraints, or accuracy requirements without changing the ISL95833HRTZ itself.

How does the R3 modulator in the ISL95833HRTZ improve power supply performance?

The R3 modulator in the ISL95833HRTZ enables variable switching frequency during load transients, achieving sub-10 µs response time and significantly improving light-load efficiency. Unlike fixed-frequency controllers, it dynamically adjusts frequency to maintain regulation during rapid load steps while minimizing switching losses at low currents. This behavior is intrinsic to the ISL95833HRTZ's architecture and directly contributes to its IMVP-7/VR12 compliance and thermal performance in compact VR designs.

Can the ISL95833HRTZ be configured for 1-phase operation on both VR outputs?

No - the ISL95833HRTZ supports configurable 2-phase or 1-phase operation only on VR1 (VCORE); VR2 (GPU) is fixed at 1-phase. The PHASE1 and PHASE2 pins may be paralleled for 1-phase VR1 operation, but VR2's PHASE3 output is dedicated and non-reconfigurable. This 2+1 topology is intentional to meet IMVP-7/VR12 requirements where VCORE often demands higher current capability than GPU, and the ISL95833HRTZ implements that exact allocation.

What package type and thermal characteristics does the ISL95833HRTZ use?

The ISL95833HRTZ is packaged in a 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch) with an exposed thermal pad. This package supports junction temperatures up to +125°C and provides low thermal resistance (θ_JA ≈ 32°C/W typical on 2-layer board) for reliable operation in thermally dense laptop VR layouts. The thermal pad must be soldered to a dedicated PCB copper pour for optimal heat dissipation - a requirement confirmed in the ISL95833HRTZ layout guidelines within FN7837 Rev 2.00.