Infineon Technologies IRS4428SPBF

Overview

IRS4428SPBF from Infineon Technologies (formerly International Rectifier) is a dual low-side gate driver IC designed to independently drive two N-channel MOSFETs or IGBTs in synchronous configurations. It features matched 50 ns propagation delays, 2.3 A source / 3.3 A sink peak output current, 6–20 V gate drive supply range, and CMOS/LSTTL-compatible Schmitt-trigger inputs. Used in high-efficiency DC-DC converters with tight timing control.

For engineers reviewing the IRS4428SPBF datasheet, IRS4428SPBF pinout, IRS4428SPBF application, or IRS4428SPBF equivalent, key selection criteria include dual-channel delay matching, logic-level input compatibility (3.3 V/5 V), output current capability under pulsed load, thermal resistance (200 °C/W), and SOIC8N package suitability for board space-constrained power stages.

Technical Context

The IRS4428SPBF integrates two independent, latch-immune CMOS driver channels with matched internal propagation paths-ensuring <±5 ns inter-channel skew at 15 V VCC. Each channel uses a high-pulse-current buffer stage optimized to minimize cross-conduction during switching transitions.

Input logic thresholds are asymmetric per channel: INA accepts 0.8 V max for logic "0" and 2.5 V min for logic "1", while INB is inverted-enabling complementary drive without external logic. Outputs swing rail-to-rail (0 V to VCC) with fast 25 ns rise/fall times into 1 nF loads.

Key Specifications

Pinout & Package

IRS4428SPBF is housed in an 8-pin SOIC narrow-body (SOIC8N) package with standard 1.27 mm pitch, JEDEC MS-012AC compliant, RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-side gate driver applications.

Compared with IRS2004PBF and LM5112MYX/NOPB, the IRS4428SPBF uniquely delivers matched dual-channel timing *and* integrated input inversion-reducing BOM count and PCB area in synchronous rectifier and half-bridge applications where timing precision and signal pairing are critical.

Availability

IRS4428SPBF is available at Aetrix Electronics and suitable for DC-DC converters, motor control inverters, and industrial SMPS requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IRS4428SPBF 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 acquired International Rectifier in 2015 and continues its legacy of high-performance power semiconductors and driver ICs for industrial, automotive, and computing markets.

The IRS44xx family was engineered specifically for cost-sensitive, high-reliability dual low-side gate driving in isolated and non-isolated DC-DC topologies-emphasizing timing accuracy, latch immunity, and ease of integration.

FAQ

What is the logic configuration difference between IRS4426SPBF, IRS4427SPBF, and IRS4428SPBF?

The IRS4426SPBF has both inputs non-inverting; IRS4427SPBF has both inputs inverting; IRS4428SPBF has INA non-inverting and INB inverting. This allows IRS4428SPBF to directly accept PWM and its complement without external logic-ideal for synchronous rectification where one FET is driven by PWM and the other by its inverse.

Can IRS4428SPBF drive GaN HEMTs effectively?

Yes-its 2.3 A source / 3.3 A sink capability, 25 ns rise/fall times, and 50 ns propagation delay support gate charging of typical 10–20 nF GaN devices at 500 kHz–1 MHz. However, layout must minimize loop inductance, and VCC must be well-decoupled due to GaN's fast dV/dt sensitivity.

Is the NC pin (Pin 7) safe to tie to ground?

No-Pin 7 is internally unconnected and must remain electrically floating. Tying it to ground may cause unpredictable behavior or increased leakage. Per IR's datasheet Section 11 (Lead Assignments), NC pins should not be soldered or connected unless explicitly permitted in the manufacturer's design guide.

Does IRS4428SPBF require external bootstrap components when used in high-side configurations?

No-it is a low-side-only driver and does not integrate bootstrap circuitry. For high-side drive, it must be paired with a dedicated high-side driver (e.g., IRS21844) or used in low-side positions only. Attempting bootstrap operation with IRS4428SPBF will result in incorrect output referencing and potential device damage.