Infineon Technologies IR3084UMPBF

Overview

IR3084UMPBF from Infineon Technologies is a VR10/VR11/Opteron/Athlon64 multi-phase voltage regulator control IC that manages system-level power sequencing, VID decoding, remote sensing, and over-current protection for CPU core supplies. It operates with 1–X matching XPhase™ phase ICs, supports 7-bit VR10/VR11 and 5-bit AMD VID codes, delivers ±300 mV differential remote sense, and achieves 0.5% system set-point accuracy in Intel modes. Used in server and desktop motherboard VRMs.

For engineers reviewing the IR3084UMPBF datasheet, IR3084UMPBF pinout, IR3084UMPBF application, or IR3084UMPBF equivalent, key selection criteria include VID mode selection via VIDSEL, programmable oscillator (150 kHz–1 MHz), VBIAS-regulated 6.9 V reference, hiccup OCP with delay, and VR-ready signaling with noise-immune blanking.

Technical Context

The IR3084UMPBF implements a master–slave architecture where it serves as the central controller coordinating multiple XPhase™ phase ICs in multiphase buck converters. Its error amplifier features 100 dB DC gain and 10 MHz GBW, enabling fast transient response; the VDAC buffer provides programmable dynamic VID slew rate via external RC network on pin 12.

VIDSEL pin configures DAC table (VR10/VR11/AMD), startup sequence, enable/VID thresholds, and no-load offset polarity-ensuring correct operation across Intel and AMD platforms. The INTL_MD output explicitly signals active vendor mode, while VOSENS− float detection triggers fault shutdown if the negative remote sense trace opens.

Key Specifications

Pinout & Package

IR3084UMPBF uses a thermally enhanced 28-lead MLPQ (4 mm × 4 mm, 0.5 mm pitch) package with exposed thermal pad. Pin 22 (LGND) serves as local ground and substrate connection; pin 20 (VBIAS) supplies regulated 6.9 V to external circuitry and phase ICs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-phase CPU voltage regulator control applications.

Compared with IR3085UMTRPBF and ISL6322CRZ-T, the IR3084UMPBF uniquely balances cross-platform compatibility (Intel VR10/VR11 + AMD Opteron), hardware-mode selectability, and proven field reliability in server/desktop VRMs-making it the optimal choice where multi-vendor support and design reuse are critical.

Availability

IR3084UMPBF is available at Aetrix Electronics and suitable for server CPU power delivery, desktop motherboard VRMs, laptop docking station PSUs, and embedded computing modules requiring stable component supply across extended product lifecycles.

Supply support for IR3084UMPBF 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in high-efficiency power conversion solutions.

The IR3084UMPBF belongs to Infineon's XPhase™ VR controller product line, designed specifically for scalable, multi-phase CPU core voltage regulation in servers, workstations, and high-end desktop platforms.

FAQ

What is the function of the VIDSEL pin, and how does it affect system behavior?

The VIDSEL pin selects the active VID DAC table (VR10, VR11, or Opteron/Athlon64), determines startup sequence type, sets enable and VID input thresholds, and reverses no-load offset polarity. When grounded, it configures VR10 mode with 0.6 V VID threshold and negative offset; floating (~2.4 V) enables VR11; and pulled to ~1.3 V via 6.49 kΩ resistor activates AMD mode with 1.24 V VID threshold and positive offset.

How does the VOSENS− float detection mechanism operate, and what is its response time?

VOSENS− float detection monitors the voltage at pin 10 relative to LGND. If V(VOSNS−) rises above 2.6 V due to an open trace, the IC asserts fault condition within 600 ns-driving VRRDY low and disabling EAOUT to halt regulation. This hardwired analog comparator operates independently of digital logic, ensuring deterministic response even during power-up or brownout events.

Can the IR3084UMPBF be used without external phase ICs, and what are the limitations?

No-the IR3084UMPBF is a control IC only and requires at least one matching XPhase™ phase IC (e.g., IR3087) to drive high-side/low-side MOSFETs. It lacks gate drivers, current sensing amplifiers, or PWM logic for direct FET control. Attempting standalone use results in no output regulation, as EAOUT and RMPOUT signals are intended solely for phase IC interface-not direct power stage control.

What is the purpose of the VSETPT pin, and how is it used in load-line implementation?

VSETPT is the error amplifier's non-inverting input, where an external resistor between VDAC and VSETPT injects current to create a voltage offset. In VR10/VR11 mode, this produces negative offset (droop) proportional to load current; in AMD mode, it yields positive offset (boost). This programmable impedance enables precise load-line tuning per Intel or AMD specifications without requiring external op-amps or complex compensation networks.