Infineon Technologies IRS21084PBF

Overview

IRS21084PBF from Infineon Technologies is a high-voltage, high-speed dual-channel gate driver IC for N-channel MOSFETs and IGBTs in half-bridge configurations. It features independent high-side (up to +600 V) and low-side channels, 540 ns internal deadtime, programmable deadtime via external R_DT, and 3.3 V/5 V/15 V logic-compatible inputs. Used in motor inverters, SMPS, and induction heating systems where shoot-through prevention and bootstrap-based high-side drive are required.

For engineers reviewing the IRS21084PBF datasheet, IRS21084PBF pinout, IRS21084PBF application, or IRS21084PBF equivalent, key selection criteria include floating channel voltage rating (+600 V), matched propagation delay (≤30 ns mismatch), undervoltage lockout thresholds (V_CC/V_BS UV+ = 8.9 V typ.), logic ground separation (V_SS), and programmable deadtime range (400–5000 ns).

Technical Context

The IRS21084PBF integrates a high-voltage level shifter for the floating high-side channel and separate logic-level shifters for HIN/LIN inputs referenced to V_SS. Its internal deadtime generator enforces minimum off-time between LO turn-off and HO turn-on (and vice versa), with fixed 540 ns baseline and scalable up to 5 µs using one external resistor on the DT pin.

Proprietary HVIC technology enables robust operation under dV/dt transients up to 50 V/ns (PDIP), while latch-immune CMOS ensures noise resilience. The device implements cross-conduction prevention logic, matched propagation delays (|t_on − t_off| ≤ 30 ns), and independent UVLO on both V_CC and V_BS supplies with 0.7 V hysteresis.

Key Specifications

Pinout & Package

IRS21084PBF is housed in a 14-lead PDIP package with creepage and clearance optimized for high-voltage isolation. Pin 1 is V_CC; pins are arranged to minimize high-di/dt loop area between VS/VB and HO/LO paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2110PBF and UCC27211D, IRS21084PBF uniquely combines programmable hardware deadtime, isolated logic ground (V_SS), and tight propagation matching - making it optimal for analog-controlled, noise-critical, medium-frequency half-bridge designs requiring deterministic timing behavior.

Availability

IRS21084PBF is available at Aetrix Electronics and suitable for motor inverters, industrial SMPS, induction heating systems, and UPS inverter stages requiring stable component supply and long-term manufacturability.

Supply support for IRS21084PBF 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 electronics, and industrial control ICs, with leadership in high-voltage gate drivers and silicon carbide solutions.

The IRS21xxx family targets high-reliability, high-voltage half-bridge and full-bridge gate driving, emphasizing robustness against dV/dt noise, shoot-through prevention, and bootstrap compatibility for cost-effective inverter designs.

FAQ

What is the function of the V_SS pin on IRS21084PBF?

V_SS serves as the dedicated logic ground reference for HIN, LIN, and DT pins. It is electrically isolated from COM (power ground), preventing noise from high-current switching paths from corrupting logic-level inputs. This separation improves noise immunity in noisy power environments and enables cleaner timing control.

Can IRS21084PBF drive SiC MOSFETs?

Yes - its 250 mA sink / 120 mA source peak output current, fast rise/fall times (100 ns / 35 ns typ.), and 50 V/ns dV/dt immunity meet typical gate drive requirements for discrete 650 V SiC MOSFETs. However, external gate resistors must be selected to limit di/dt and manage ringing, as IRS21084PBF does not include active Miller clamp or negative turn-off features.

How is deadtime programmed using the DT pin?

The DT pin accepts a resistor (R_DT) tied between DT and V_SS. Deadtime scales linearly with resistance: 0 Ω yields 540 ns, 200 kΩ yields ~5 µs. The relationship is specified in the datasheet as DT = 540 ns + (R_DT × 22 ns/kΩ). No capacitor or additional components are required.

Does IRS21084PBF require external bootstrap diode and capacitor?

Yes - the VB and VS pins form the floating supply interface for the high-side driver. A bootstrap diode (fast recovery, ≥1 A) and capacitor (≥0.1 µF, X7R or C0G) must be connected externally between V_CC and VB, with VS tied to the switching node. This network replenishes charge lost during high-side conduction cycles.