Infineon Technologies IRS2509C

Overview

IRS2509C from Infineon Technologies is a high-voltage, half-bridge gate driver IC designed for driving external N-channel MOSFETs in resonant LLC and half-bridge SMPS topologies. It features 600 V high-side floating capability, integrated bootstrap diode, 120 ns propagation delay, and operates from 10–20 V V_DD. It is used in AC-DC adapters, LED drivers, and industrial power supplies requiring precise timing control.

For engineers reviewing the IRS2509C datasheet, IRS2509C pinout, IRS2509C application, or IRS2509C equivalent, key selection considerations include high-side voltage rating, propagation delay matching between high- and low-side channels, dead-time control method, thermal performance in TO-263-7 package, and compatibility with 50–500 kHz resonant switching frequencies.

Technical Context

The IRS2509C integrates independent high-side and low-side drivers with matched propagation delays (120 ns typical) and built-in level-shifting circuitry enabling operation up to 600 V on the high-side. It uses a floating channel architecture with internal bootstrap diode and undervoltage lockout (UVLO) thresholds of 9.5 V (on) / 8.5 V (off) on both channels.

It supports non-overlapping drive outputs via internal logic that enforces minimum dead time (~500 ns), preventing shoot-through. The device accepts TTL/CMOS-compatible input signals and delivers peak output currents of ±2 A, sufficient to drive MOSFET gates with Q_g up to 50 nC at 300 kHz switching.

Key Specifications

Pinout & Package

IRS2509C is housed in a 7-pin TO-263-7 (D²PAK) thermally enhanced surface-mount package with an exposed drain pad for improved heat transfer. Pin 1 is marked by a notch or dot; pin numbering follows standard D²PAK convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge gate driver applications.

Compared with IR21531STRPBF and UCC27211D, IRS2509C uniquely combines independent dual-input control, integrated bootstrap diode, and matched propagation delays-making it optimal for externally clocked, high-efficiency resonant converters where timing precision and layout simplicity are critical.

Availability

IRS2509C is available at Aetrix Electronics and suitable for LED drivers, LLC resonant converters, industrial motor drives, and UPS inverters requiring stable component supply and long-term manufacturability.

Supply support for IRS2509C 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 leadership in high-voltage gate drivers and silicon carbide solutions.

The IRS2509C belongs to Infineon's high-voltage gate driver product line, engineered specifically for resonant and hard-switched half-bridge topologies in energy-efficient power conversion systems.

FAQ

What is the maximum recommended switching frequency for IRS2509C?

The IRS2509C is characterized for reliable operation up to 500 kHz, with propagation delay and rise/fall times optimized for 200–400 kHz resonant LLC converters. At 500 kHz, gate drive losses increase due to capacitive loading, so thermal design must ensure junction temperature remains below 150 °C using the exposed D²PAK drain pad.

Does IRS2509C require an external bootstrap capacitor?

Yes, IRS2509C requires an external bootstrap capacitor (typically 0.1–0.22 μF ceramic) connected between VB and VS pins. Although it integrates a bootstrap diode, the capacitor provides charge storage for high-side driver operation during continuous conduction; insufficient capacitance causes high-side output dropout at duty cycles >95%.

Can IRS2509C drive SiC MOSFETs?

IRS2509C can drive 650 V SiC MOSFETs provided gate resistance and layout minimize ringing. Its ±2 A peak output current and 120 ns propagation delay meet typical SiC gate requirements, but designers must verify gate loop inductance and use negative turn-off voltage (via external circuit) for robustness, as IRS2509C does not provide active Miller clamp or negative voltage drive.

How is thermal performance affected by PCB layout?

Thermal resistance (R_θJA) drops from 60 °C/W (standard 2-layer board) to 35 °C/W when the exposed drain pad is soldered to ≥4 cm² internal copper pour with 6+ thermal vias. Poor layout-such as missing vias or undersized copper-causes junction temperature to exceed 150 °C at 1.2 W dissipation, triggering thermal shutdown.