Infineon Technologies IRU3037ACSTRPBF

Overview

IRU3037ACSTRPBF from Infineon Technologies is a fixed-frequency voltage-mode synchronous PWM controller for buck DC-DC converters, supporting 400 kHz switching, 500 mA peak gate drive, and dual N-channel MOSFET control in an 8-pin SOIC package. It delivers precise 1.8 V or lower output voltages at >3 A for DDR memory Vtt regulation and graphics card power rails.

For engineers reviewing the IRU3037ACSTRPBF datasheet, IRU3037ACSTRPBF pinout, IRU3037ACSTRPBF application, or IRU3037ACSTRPBF equivalent, key selection criteria include UVLO thresholds (Vcc=4.2 V, Vc=3.3 V), Fb reference voltage (0.800 V), soft-start programmability, latch-off short-circuit protection, and compatibility with logic-level N-MOSFETs such as IRF7313.

Technical Context

The IRU3037A implements voltage-mode PWM control using a precision 0.800 V internal reference and error amplifier with transconductance of 64 µmho. Its 400 kHz oscillator sets fixed timing, independent of load or input variation, enabling stable loop compensation via external R-C on the Comp pin.

Under-voltage lockout independently monitors Vcc (4.2 V threshold, 0.2 V hysteresis) and Vc (3.3 V threshold, 0.2 V hysteresis) to prevent erratic operation during brownout. Output short-circuit protection latches off PWM outputs when Fb falls below 0.4 V, while the SS/SD pin enables both programmable soft-start and active shutdown.

Key Specifications

Pinout & Package

IRU3037ACSTRPBF is housed in an 8-pin SOIC NB (Small Outline Integrated Circuit, Narrow Body) package with standard 1.27 mm pitch and gull-wing leads. Thermal resistance θ_JA is 124°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS5430DDAR and ISL6208CRZ, the IRU3037ACSTRPBF provides superior short-circuit survivability via built-in latch-off, lower BOM cost through discrete MOSFET flexibility, and tighter reference voltage (0.800 V vs. 1.25 V) for sub-1.5 V rails-making it optimal for DDR Vtt and GPU core supplies.

Availability

IRU3037ACSTRPBF is available at Aetrix Electronics and suitable for DDR memory Vtt regulation, graphics card core power, and embedded industrial I/O modules requiring stable component supply across extended production cycles.

Supply support for IRU3037ACSTRPBF 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 high-efficiency DC-DC conversion and ruggedized analog controllers.

The IRU3037A belongs to Infineon's legacy synchronous buck controller product line, designed specifically for cost-sensitive, high-reliability on-board power conversion in computing and storage applications.

FAQ

What is the minimum recommended soft-start capacitor value for IRU3037ACSTRPBF?

The soft-start capacitor value determines startup time via t_START = 75 × C_SS (ms). For a typical 7.5 ms ramp, use 0.1 µF ceramic. Smaller values (e.g., 0.047 µF) yield faster startup but increase inrush risk; larger values (≥0.22 µF) extend ramp time beyond most system requirements.

Can IRU3037ACSTRPBF operate with a 3.3 V input supply?

No. The Vcc UVLO threshold is 4.2 V, and the controller requires ≥4.2 V on Vcc and ≥3.3 V on Vc to enable operation. It is designed for 5 V or 12 V input buses-not 3.3 V intermediate rails.

Does IRU3037ACSTRPBF support external synchronization?

No. The oscillator is fully internal and fixed at 400 kHz for the "A" version. There is no SYNC pin or frequency adjustment capability-unlike programmable controllers such as the ISL6208.

What is the maximum duty cycle limit and why does it matter?

The maximum duty cycle is 90%. This ensures sufficient off-time for high-side MOSFET bootstrap capacitor recharge and prevents shoot-through during high-input/low-output conditions (e.g., 12 V → 1.8 V). Exceeding this risks loss of high-side gate drive and regulation failure.