Infineon Technologies IR36021MTRPBF

Overview

IR36021MTRPBF from Infineon Technologies is a dual-loop digital multi-phase buck controller for point-of-load power delivery, supporting 2+1 or 1+1 VR configurations with I²C/PMBus interface, independent loop switching frequencies from 200 kHz to 2 MHz, IR Adaptive Transient Algorithm (ATA), and Dynamic Phase Control (DPC) for high-current ASIC/DSP supplies in server and telecom systems.

For engineers reviewing the IR36021MTRPBF datasheet, IR36021MTRPBF pinout, IR36021MTRPBF application, or IR36021MTRPBF equivalent, key selection criteria include dual-loop telemetry capability, MTP-configurable fault thresholds (OVP/UVP/OCP/OTP), VRHOT#/ICRIT# alert signaling, and 32-pin 5 mm × 5 mm QFN package compatibility with high-density POL layouts.

Technical Context

The IR36021 implements two independent digital control loops with proprietary non-linear PWM algorithms enabling ATA-driven transient response optimization and DPC-based phase shedding. Each loop supports differential voltage sensing (VSEN/VRTN), dual current sense inputs per phase (ISEN/IRTN), and programmable loadline via RCSP/RCSM networks.

It integrates an on-chip 1.8 V LDO, 3.3 V bias supply (VCC), thermistor-based temperature monitoring (TSEN), VINSEN input detection, and SMBus-compliant interface with ADDR_PROT pin for hardware address locking and bus security - all operating across −40°C to +85°C ambient.

Key Specifications

Pinout & Package

32-pin 5 mm × 5 mm QFN package with exposed thermal pad (GND-connected). Pin 33 is the primary ground reference; large bottom-side metal pad must be soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital POL buck controller applications.

Compared with ISL68127IRZ and MP2960GQZ, the IR36021MTRPBF uniquely supports true dual-loop autonomy, MTP-based field reconfiguration, and dedicated VRHOT#/ICRIT# alert signaling - essential for server-grade reliability and thermal-aware power management.

Availability

IR36021MTRPBF is available at Aetrix Electronics and suitable for server CPU VR, telecom baseband processor VR, and netcom line card power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for IR36021MTRPBF 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, automotive, and industrial control ICs, with deep expertise in digital power conversion and energy-efficient solutions.

The IR36021 belongs to Infineon's Digital POL Controller product line, designed specifically for high-efficiency, high-density point-of-load regulation in datacenter, telecom, and embedded computing systems demanding precise telemetry and adaptive transient response.

FAQ

What is the function of the ADDR_PROT pin on the IR36021MTRPBF?

The ADDR_PROT pin serves a dual role: at power-on, a resistor to ground sets the I²C slave address; once VCC is stable, it becomes a logic input that enables or disables I²C communication. This prevents unauthorized or accidental bus access after configuration, enhancing system security in multi-controller environments without requiring external logic.

Does the IR36021MTRPBF support diode emulation mode, and how is it activated?

Yes, the IR36021MTRPBF supports active diode emulation for improved light-load efficiency. It activates automatically during low-current conditions via Dynamic Phase Control (DPC), or can be commanded via PMBus register write. The feature disables synchronous rectification and controls high-side FET timing to emulate freewheeling diode behavior, reducing reverse recovery losses.

How does the VRHOT_ICRIT# pin differ from standard thermal alert outputs?

The VRHOT_ICRIT# pin is a combined alert signal asserting low when either board temperature (via TSEN) OR average load current (ITOT) exceeds independently programmable thresholds. Unlike simple thermal flags, it enables unified over-temperature and over-current protection with a single interrupt line, simplifying system-level fault handling in space-constrained designs.

Can the IR36021MTRPBF operate with only one output enabled?

Yes - the IR36021MTRPBF supports flexible configurations including 2+0 (Loop #1 only), 0+1 (Loop #2 only), and 1+1 (single-phase per loop). EN1 and EN2 pins independently enable/disable each loop; unused PWM outputs remain in high-impedance state, and associated current/voltage sense channels are disabled to minimize quiescent current.