Infineon Technologies IRU3037ACFTRPBF

Overview

IRU3037ACFTRPBF 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 TSSOP package. It delivers regulated 1.8 V/3.3 V/5 V outputs up to 5 A for DDR memory Vtt sourcing/sinking and graphics card power rails.

For engineers reviewing the IRU3037ACFTRPBF datasheet, IRU3037ACFTRPBF pinout, IRU3037ACFTRPBF application, or IRU3037ACFTRPBF equivalent, key selection criteria include oscillator frequency (400 kHz), UVLO thresholds (Vcc = 4.2 V, Vc = 3.3 V), Fb reference voltage (0.800 V), soft-start programmability, and short-circuit latch-off protection at 0.4 V output.

Technical Context

The IRU3037ACFTRPBF implements voltage-mode PWM control with a precision 0.800 V internal reference and error amplifier driving a fixed-frequency sawtooth comparator. Its oscillator uses on-chip capacitance to set 400 kHz operation, enabling tight transient response in low-voltage, high-current applications.

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 startup. Output short-circuit protection latches off PWM when Fb falls below 0.4 V, while the SS/SD pin enables programmable soft-start and active shutdown.

Key Specifications

Pinout & Package

8-pin TSSOP (F) package with exposed thermal pad; RoHS-compliant lead-free finish per J-STD-020 moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2307DN-LF-Z and TPS54332DR, the IRU3037ACFTRPBF uniquely combines 400 kHz fixed frequency, independent Vc biasing for high-side drive, and 0.4 V latch-off protection-making it optimal for DDR Vtt and graphics card applications requiring deterministic fault response and external FET flexibility.

Availability

IRU3037ACFTRPBF is available at Aetrix Electronics and suitable for DDR memory Vtt regulation, graphics card core supplies, and hard disk drive power conversion requiring stable component supply across commercial temperature range and long-lifecycle production.

Supply support for IRU3037ACFTRPBF 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 global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IRU3037A product line targets cost-sensitive, high-efficiency synchronous buck regulation for computing peripherals and embedded systems, emphasizing robust fault protection and flexible external FET selection.

FAQ

What is the minimum recommended soft-start capacitor value for IRU3037ACFTRPBF?

The datasheet specifies a 20 µA internal current source charging the SS/SD capacitor. For a typical 7.5 ms startup time, a 0.1 µF ceramic capacitor is recommended. Values below 0.047 µF risk insufficient ramp time and potential overshoot; larger values extend startup but improve inrush control. Avoid electrolytic types due to leakage current affecting accuracy.

Can IRU3037ACFTRPBF operate with a 3.3 V input supply?

No-IRU3037ACFTRPBF requires minimum Vcc = 4.2 V and Vc = 3.3 V to exit UVLO. With only 3.3 V applied to Vcc, the device remains latched off. It is designed for 5 V or 12 V input rails. For 3.3 V input applications, consider alternatives like TPS54332DR that support lower bias voltages.

How does the IRU3037ACFTRPBF protect against high-side MOSFET failure?

When the control (high-side) FET shorts, the controller detects overvoltage at the Fb pin and responds by forcing maximum duty cycle on the synchronous (low-side) FET. This clamps the output to near ground, limiting power dissipation and preventing damage to downstream loads or input supply.

Is the 0.800 V Fb reference voltage trimmed at production?

Yes-the 0.800 V reference is factory-trimmed to ±1.2% over temperature (0–70 °C), as confirmed in the Electrical Specifications table. This enables accurate output programming (e.g., 1.8 V = 0.800 V × (1 + R6/R5)) without external calibration, critical for DDR Vtt compliance.