Infineon Technologies IR3502BMTRPBF

Overview

IR3502BMTRPBF from Infineon Technologies is a VR11.0/VR11.1-compatible multi-phase buck controller IC designed for CPU/GPU core voltage regulation. It provides system-level control, daisy-chain phase timing, 0.5% set-point accuracy, programmable 250 kHz–1.5 MHz per-phase switching (via ROSC), and integrated remote sensing with open-sense protection - deployed in high-density server VRMs.

For engineers reviewing the IR3502BMTRPBF datasheet, IR3502BMTRPBF pinout, IR3502BMTRPBF application, or IR3502BMTRPBF equivalent, key selection criteria include VID slew rate programmability, thermal compensation via single NTC, hiccup overcurrent response timing, and compatibility with XPHASE3™ Phase ICs for scalable 1–X phase designs.

Technical Context

The IR3502B implements a centralized control architecture where it manages up to X phases via PHSOUT/PHSIN daisy-chained timing signals, eliminating external interleaving components. Its error amplifier delivers 30 MHz bandwidth and 10 V/µs slew rate to support fast transient response in sub-1V CPU core rails.

It integrates dual-path current reporting (IIN + IMON), thermistor-based VRHOT monitoring, and coordinated overvoltage protection - with OVP thresholds dynamically referenced to VDAC during normal operation (105–145 mV) and fixed at power-up (1.1–1.3 V). The ROSC pin simultaneously sets oscillator frequency, bias currents, and OC delay cycles.

Key Specifications

Pinout & Package

IR3502BMTRPBF uses a thermally enhanced 32-lead MLPQ package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad for high-power density VRM applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-phase VR controller applications.

Compared with IR35203MTRPBF and MP2940AGQSE-Z, the IR3502BMTRPBF offers optimal balance of analog precision, thermal adaptability via NTC, and hardware-scalable phase architecture - making it ideal for high-reliability server VRMs where deterministic analog control and thermal-aware current management are critical.

Availability

IR3502BMTRPBF is available at Aetrix Electronics and suitable for server CPU VRMs, AI accelerator power delivery, network switch ASIC supplies, and high-performance FPGA core rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for IR3502BMTRPBF 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 global semiconductor leader specializing in power management, sensor, and automotive ICs, with deep expertise in high-efficiency power conversion solutions.

The IR3502B belongs to Infineon's XPHASE™ multi-phase controller family, engineered specifically for high-current, low-voltage CPU/GPU core regulation in datacenter and enterprise computing platforms.

FAQ

What is the function of the ROSC pin beyond setting oscillator frequency?

The ROSC pin serves three concurrent functions: it sets the per-phase switching frequency, programs bias currents for VSETPT, VDAC, and OCSET circuits, and determines overcurrent delay cycle count (1024–4096 PHSOUT cycles). Its voltage remains at 0.6 V during normal operation but rises above 1.6 V to signal an overvoltage condition to connected Phase ICs.

How does the IR3502B handle remote sense line failure?

The IR3502B continuously monitors VOSEN+ and VOSEN− for open-circuit conditions using dedicated comparators. If VOSEN+ falls below 87.5% of VCCL or VOSEN− exceeds 0.44 V, it triggers open-sense detection, disables regulation, and forces PGOOD low. This prevents unregulated output voltage that could damage downstream logic.

Can the IR3502B operate without an external Phase IC?

No - the IR3502B is a controller-only device requiring companion XPHASE3™ Phase ICs (e.g., IR3548A) to drive high-side/low-side MOSFETs. It lacks integrated gate drivers and relies on PHSOUT/PHSIN daisy-chaining to synchronize multiple phases. Standalone operation is not supported.

What is the role of the VDRP pin in load-line implementation?

VDRP outputs a buffered, thermally compensated version of the IIN signal. When connected via an RC network to FB, it injects a current proportional to load into the error amplifier's feedback node - creating programmable output impedance (droop) for accurate current sharing across parallel phases in multi-phase VRMs.