IR21844S

Gate Driver Overview

The IR21844S is a high-voltage, high-speed power MOSFET and IGBT gate driver IC designed for half-bridge topologies. It features two independent output channels with a floating channel supporting bootstrap operation up to 600 V. The device tolerates negative transient voltage and offers dV/dt immunity. It accepts logic supply voltages from 10 V to 20 V and supports 3.3 V and 5 V input logic compatibility. Key electrical parameters include an output source current of 1.9 A and a sink current of 2.3 A. Undervoltage lockout thresholds are set at 8.9 V (On) and 8.2 V (Off) for both the VS and VCC supplies. Propagation delays are specified as 680 ns for turn-on and 270 ns for turn-off.

Gate Driver Feature Summary

• Provides high-voltage isolation for floating high-side channel operation suitable for bootstrap driving.
• Features undervoltage lockout protection for both high-side and low-side supply rails.
• Compatible with standard CMOS and TTL logic inputs for direct interface with control circuits.
• Designed with matched propagation delays to ensure synchronized switching in half-bridge configurations.

Gate Driver Applications

• Industrial motor drives
• Power supply inverters
• IGBT and MOSFET switching applications

Gate Driver Procurement Notes

Verify the specific suffix designation when ordering, as package type and tape/reel options vary across the IR2184 family. Confirm that the component meets industrial quality grades if required for the target application. Check for end-of-life status or recommended new designations, as some variants in this series may be obsolete. Ensure the selected package matches the PCB footprint requirements for either SOIC or PDIP formats.

Gate Driver Selection Notes

Select the IR21844S when a robust half-bridge driver with 600 V blocking capability is needed. Consider the higher peak output currents compared to lower-power variants for driving larger capacitive loads. Evaluate the need for functional level-shift isolation versus galvanic isolation depending on system safety requirements. Ensure the control logic voltage aligns with the supported 3.3 V or 5 V input ranges.

Gate Driver Part Context

The IR21844S belongs to the IR2184 family of high-voltage gate drivers manufactured by Infineon Technologies. This family includes single-channel (IR2184) and dual-channel (IR21844) variants available in various packages such as PDIP and SOIC. The components are designed for demanding power electronics applications requiring reliable switching of IGBTs and MOSFETs in medium-voltage environments.

Gate Driver Replacement Considerations

The IR2184SPBF is a lead-free variant of the single-channel IR2184, not a direct pin-compatible replacement for the dual-channel IR21844S. For direct replacements within the same family, verify availability of other IR21844 package options. Cross-reference with newer Infineon gate driver families for potential upgrades in performance or packaging.