Infineon Technologies IR3086AMPBF

Overview

IR3086AMPBF from Infineon Technologies is a multiphase buck converter Phase IC designed to drive and monitor one phase in XPhase™-based CPU/ASIC power supplies. It delivers 2.5A average gate drive, supports ≤100ns minimum pulse width for 1MHz operation, integrates loss-less DCR current sensing with internal temperature compensation, and provides OVP (150ns response), phase fault detection, and programmable overtemperature protection. Used in high-current VRMs for server CPUs and FPGA power delivery.

For engineers reviewing the IR3086AMPBF datasheet, IR3086AMPBF pinout, IR3086AMPBF application, or IR3086AMPBF equivalent, key selection criteria include its 20-pin MLPQ thermally enhanced package, dual gate drivers (GATEH/GATEL) with sub-25ns propagation delays, analog current share bus (ISHARE) interface, and compatibility with IR3081A Control IC via 5-wire analog bus.

Technical Context

The IR3086AMPBF implements feed-forward voltage-mode PWM control with trailing-edge modulation, where ramp slope is dynamically adjusted by input voltage via external RC network on PWMRMP. Its current sense amplifier (CSIN+/CSIN−) provides 34× gain with ±5mV offset and drives the ISHARE bus for inter-phase current balancing.

It features Body Braking™-a transient-enhancement function that disables the synchronous MOSFET during load release to prevent negative output voltage-and integrates dedicated comparators for OVP (threshold = 100–160mV above DACIN), phase fault (88–94% of DACIN), and VRHOT (programmable via HOTSET resistor divider).

Key Specifications

Pinout & Package

IR3086AMPBF uses a thermally enhanced 20-lead MLPQ (4mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin numbering follows standard counter-clockwise orientation starting from top-left corner (Pin 1 = RMPIN+).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiphase buck phase driver applications.

Compared with IR3087AMPBF, the IR3086AMPBF offers lower gate drive and no adaptive dead-time but maintains identical XPhase™ interoperability and smaller thermal footprint; versus ISL6367CRZ, it requires an external Control IC but delivers superior current matching accuracy (<±1% vs. ±3%) and faster analog fault response.

Availability

IR3086AMPBF is available at Aetrix Electronics and suitable for server CPU VRMs, FPGA core power supplies, ASIC SoC power delivery, and AI accelerator modules requiring stable component supply and long-term industrial lifecycle support.

Supply support for IR3086AMPBF 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 IR3086A belongs to Infineon's XPhase™ multiphase controller family, engineered specifically for scalable, high-current, low-voltage CPU and ASIC power delivery with emphasis on analog current sharing, fast transient response, and thermal robustness.

FAQ

What is the purpose of the ISHARE pin and how is it used in a multi-phase design?

The ISHARE pin outputs the amplified current sense signal (V_DACIN + 34 × ΔV_CSIN) and serves as the analog current share bus node. In multi-phase systems, all ISHARE pins are tied together; the Control IC monitors this shared voltage to adjust individual phase duty cycles and enforce <±1% current matching across phases without additional communication overhead.

How does Body Braking™ improve transient response during load release?

Body Braking™ disables the synchronous low-side MOSFET during rapid load reduction, allowing the body diode to conduct and clamp the output voltage instead of permitting reverse current flow. This prevents negative output voltage excursions and reduces recovery time by >30% compared to standard synchronous rectification, especially critical for CPU V_DD rail stability.

Can IR3086AMPBF operate without an external Control IC like IR3081A?

No - IR3086AMPBF is a dedicated Phase IC and requires a companion Control IC (e.g., IR3081A) to provide DACIN reference, BIASIN bias voltage, PWMRMP ramp, EAIN error signal, and phase timing. It lacks internal oscillator, VID decoder, or system-level fault logic; standalone operation is not supported.

What is the recommended PCB layout practice for the thermal pad on the 20L MLPQ package?

The exposed thermal pad must be soldered to a minimum 200mm² copper pour on the PCB's inner or bottom layer, connected via ≥6 thermal vias (0.3mm diameter, filled or capped) to internal ground planes. This achieves ≤40°C/W junction-to-ambient thermal resistance and prevents thermal shutdown during sustained 2.5A gate drive operation.