Infineon Technologies IRU3037CSPBF

Overview

IRU3037CSPBF from Infineon Technologies is a fixed-frequency voltage-mode synchronous PWM controller for buck DC-DC converters, operating from a single 5V or 12V supply, featuring 200 kHz oscillator, 500 mA peak gate drive, under-voltage lockout (Vcc threshold 4.2 V, Vc threshold 3.3 V), and latch-off short-circuit protection at 0.6 V output fault detection - used in DDR memory Vtt source/sink rails and low-cost 5V-to-1.8V/2.5V/3.3V on-board power conversion.

For engineers reviewing the IRU3037CSPBF datasheet, IRU3037CSPBF pinout, IRU3037CSPBF application, or IRU3037CSPBF equivalent, key selection criteria include its SOIC-8 package compatibility, internal 200 kHz timing, soft-start programmability via external capacitor, Fb reference voltage of 1.25 V ±2.5%, and dual N-MOSFET gate drive capability with dead-time control.

Technical Context

The IRU3037CSPBF implements voltage-mode PWM control using an internal 200 kHz sawtooth oscillator and error amplifier with 1.25 V reference. It integrates separate high-side (HDrv) and low-side (LDrv) drivers capable of 500 mA peak current, each with defined rise/fall times (≤85 ns/≤100 ns) and programmable dead-band timing.

Under-voltage lockout independently monitors Vcc (4.2 V threshold, 0.2 V hysteresis) and Vc (3.3 V threshold, 0.2 V hysteresis); output short-circuit protection latches off PWM when Fb falls below 0.6 V; soft-start is implemented via internal 25 µA current source charging an external capacitor to 3 V.

Key Specifications

Pinout & Package

IRU3037CSPBF is housed in an 8-pin plastic SOIC NB (Small Outline Integrated Circuit, Narrow Body) package with standard 1.27 mm pitch and gull-wing leads - compatible with automated PCB assembly and IPC-7351B footprint IPC-SOIC-8-N.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRU3037CSPBF, the IRU3037ACSPBF trades lower quiescent current and tighter short-circuit response for higher gate drive losses, while the TPS5430DR reduces BOM count at the cost of reduced fault resilience and fixed 3.5 A current limit.

Availability

IRU3037CSPBF is available at Aetrix Electronics and suitable for DDR memory Vtt rails, graphics card core supplies, and industrial embedded 3.3 V power conversion requiring stable component supply across production lifecycles.

Supply support for IRU3037CSPBF 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 IRU3037 belongs to Infineon's legacy synchronous buck controller product line, engineered specifically for cost-sensitive, high-current board-level DC-DC conversion in computing and storage applications.

FAQ

What is the minimum recommended input voltage for reliable startup of IRU3037CSPBF?

The IRU3037CSPBF requires Vcc ≥ 4.2 V and Vc ≥ 3.3 V simultaneously to exit under-voltage lockout and initiate soft-start. Below these thresholds, both gate drivers remain disabled regardless of SS/SD state. Startup is guaranteed only when both supplies exceed their respective UVLO thresholds with ≥0.2 V hysteresis margin.

Can IRU3037CSPBF drive logic-level MOSFETs without level-shifting?

Yes - the IRU3037CSPBF's LDrv and HDrv outputs are fully compatible with logic-level N-channel MOSFETs (e.g., IRF7313, IRF7301) having VGS(th) ≤ 2.5 V. Its 500 mA peak drive strength ensures <50 ns turn-on for typical gate charges under 10 nC, eliminating need for external level shifters in standard 5 V/12 V input systems.

How does the latch-off short-circuit protection behave during transient overloads?

The latch-off protection triggers only when Fb remains ≤ 0.6 V for >10 µs - ignoring brief transients such as load steps or noise spikes. Once latched, the device stays off until Vcc or Vc is cycled below UVLO thresholds. This prevents nuisance tripping during normal 100–200 mA load transients while ensuring hard fault isolation.

Is external compensation mandatory for stable operation?

Yes - the Comp pin requires an external RC network (e.g., 25 kΩ + 1 nF) to set dominant pole and phase margin. Omitting compensation causes oscillation or excessive ringing on LDrv/HDrv outputs due to open-loop instability of the internal error amplifier; typical designs achieve >45° phase margin with this configuration across 0–70°C.