Infineon Technologies IRS4428STRPBF

Overview

IRS4428STRPBF from Infineon Technologies (formerly International Rectifier) is a dual low-side gate driver IC designed to independently drive two N-channel power MOSFETs or IGBTs in synchronous or phase-shifted 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 - enabling robust operation in DC-DC half-bridge and motor control stages.

For engineers reviewing the IRS4428STRPBF datasheet, IRS4428STRPBF pinout, IRS4428STRPBF application, or IRS4428STRPBF equivalent, key selection criteria include channel independence, propagation delay matching, logic-level compatibility (3.3 V/5 V), SOIC-8 thermal performance (R_thJA = 200 °C/W), and latch-immune CMOS process reliability under industrial temperature range (−40 °C to +125 °C).

Technical Context

The IRS4428STRPBF integrates two independent high-current buffer stages with matched internal propagation paths, ensuring ≤±5 ns inter-channel delay skew across temperature and supply voltage. Its input stage uses latch-immune CMOS with Schmitt-trigger hysteresis (V_IL ≤ 0.8 V, V_IH ≥ 2.5 V), supporting direct interface to microcontrollers and PWM controllers without external level-shifting.

Each output stage delivers asymmetric drive strength: 2.3 A peak source current for turn-on and 3.3 A peak sink current for turn-off, optimized for fast MOSFET switching with minimal cross-conduction risk. The device operates with a single V_CC supply (6–20 V), referenced to COM, and requires no bootstrap or floating supplies - simplifying layout in low-side-only topologies.

Key Specifications

Pinout & Package

IRS4428STRPBF is housed in a standard SOIC-8 narrow-body package (5.3 mm × 4.4 mm, 1.27 mm pitch), with exposed pad not present. Thermal performance assumes JEDEC-standard board mounting (2-layer, 1 oz Cu, 1 in² copper pour per lead).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5112MMX/NOPB and UCC27524ADRMT, IRS4428STRPBF offers simpler single-supply operation, native 3.3 V/5 V compatibility, and industrial qualification at lower cost - making it optimal for cost-sensitive, thermally constrained DC-DC and motor control applications where ±5 ns matching suffices.

Availability

IRS4428STRPBF is available at Aetrix Electronics and suitable for DC-DC converters, industrial motor control stages, and LED constant-current drivers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for IRS4428STRPBF 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 gate drivers.

The IRS44xx family was engineered for ruggedized, low-cost dual low-side driving in industrial and telecom power systems - emphasizing latch immunity, delay matching, and wide V_CC tolerance without auxiliary supplies.

FAQ

What is the maximum allowable V_CC voltage for continuous operation?

The absolute maximum V_CC is 25 V, but continuous operation must stay within the recommended 6–20 V range. Exceeding 20 V risks accelerated degradation of internal oxide layers and violates JEDEC industrial qualification limits. At 20 V, thermal limits require derating to ≤0.45 W at 85 °C ambient per R_thJA = 200 °C/W.

Can IRS4428STRPBF drive high-side MOSFETs?

No - IRS4428STRPBF is strictly a low-side driver with outputs referenced to COM (ground). It lacks a floating high-side supply or level-shifting circuitry. Driving high-side N-MOSFETs requires either a dedicated high-side driver (e.g., IRS2007) or a bootstrap-based solution incompatible with this IC's architecture.

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

Yes - Pin 7 is internally unconnected and may be left floating or tied to COM (ground) per IPC-2221 layout guidelines. Doing so improves mechanical stability and reduces potential for parasitic coupling. Never connect it to V_CC or any active signal, as no internal bonding exists.

How does propagation delay matching impact interleaved converter performance?

≤±5 ns inter-channel delay matching minimizes timing skew between phases, reducing circulating current and output ripple in interleaved buck converters. At 500 kHz, 10 ns skew introduces ~1.8° phase error - well below the 3° threshold where current imbalance exceeds 5%, preserving efficiency and thermal balance across phases.