Texas Instruments UCC21540DW

Overview

UCC21540DW from Texas Instruments is a reinforced-isolation dual-channel gate driver IC designed for high-reliability power stage control in isolated topologies. It delivers 4 A peak source and 6 A peak sink output current, supports up to 18 V VDD drive supply with 8 V UVLO, achieves ≥125 V/ns CMTI, and features resistor-programmable dead time - enabling robust gate driving of Si MOSFETs, IGBTs, and GaN transistors in high-voltage DC-DC converters and motor inverters.

For engineers reviewing the UCC21540DW datasheet, UCC21540DW pinout, UCC21540DW application, or UCC21540DW equivalent, this page provides verified technical context, SOIC-16 package mapping, functional pin definitions, safety-certified isolation specs (5700 VRMS UL, 8000 VPK VDE), and validated alternative options for half-bridge, dual low-side, or dual high-side configurations.

Technical Context

The UCC21540DW integrates two independent isolated output channels separated by a 5.7 kVRMS reinforced insulation barrier, with input logic referenced to primary-side GND and outputs referenced to isolated VSSA/VSSB grounds. Its architecture supports configurable operation modes - including two low-side, two high-side, or half-bridge - via external input routing and DT pin programming.

It implements TTL/CMOS-compatible inputs with internal pull-down, programmable dead time (via RDT resistor), simultaneous disable (DIS pin), and robust protection including –5 V/50 ns negative voltage tolerance on INA/INB, VDD/VCCI UVLO with hysteresis, and active pull-down during VDD power-down.

Key Specifications

Pinout & Package

DW package is a 16-pin wide-body SOIC with 1.27 mm pitch, 10.3 mm × 7.5 mm body, and reinforced isolation barrier separating primary (pins 1–8) and secondary (pins 9–16) sides. Creepage and clearance exceed 8 mm per IEC 60664-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC21540ADW and UCC21541DW, the UCC21540DW offers the highest drive strength and 8 V UVLO margin for stable operation with 12 V secondary supplies, making it the preferred choice for high-efficiency, high-reliability industrial and renewable energy systems requiring full 4 A/6 A capability.

Availability

UCC21540DW is available at Aetrix Electronics and suitable for isolated AC-DC power supplies, industrial motor drives, and solar microinverters requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for UCC21540DW 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability isolation and gate driver design.

The UCC2154x family was developed to address the demand for high-CMTI, reinforced-isolation dual drivers in next-generation power conversion systems - targeting server PSUs, EV charging, industrial motor control, and photovoltaic inverters.

FAQ

What is the isolation voltage rating of the UCC21540DW?

The UCC21540DW is certified for 5700 VRMS isolation per UL 1577 (1-minute test) and 8000 VPK reinforced isolation per DIN EN IEC 60747-17 (VDE 0884-17). These ratings apply to the internal insulation barrier between primary and secondary sides, supporting safe operation in 1000 VRMS mains-connected equipment.

Does the UCC21540DW support half-bridge configuration?

Yes, the UCC21540DW supports half-bridge operation by assigning one channel as high-side (driving upper FET with VDDA/VSSA) and the other as low-side (driving lower FET with VDDB/VSSB). Its independent secondary supplies and isolated grounds enable true floating high-side drive without bootstrap complexity.

What is the purpose of the DT pin on the UCC21540DW?

The DT pin on the UCC21540DW enables resistor-programmable dead time between the two output channels. Connecting a resistor (10–50 kΩ) from DT to GND sets dead time from 80 ns to 600 ns using the formula DT(ns) = 10 × RDT(kΩ); tying DT to VCCI disables dead time and allows output overlap.

Can the UCC21540DW drive GaN transistors effectively?

Yes, the UCC21540DW is explicitly designed for GaN FETs, delivering 4 A peak source and 6 A peak sink current with 33 ns propagation delay and 6 ns pulse-width distortion - enabling clean, high-frequency switching (>1 MHz) while maintaining tight timing control and minimizing gate loop losses.

What are the UVLO thresholds for VDDA and VDDB on the UCC21540DW?

The UCC21540DW has an 8 V nominal UVLO threshold for VDDA and VDDB: rising threshold is 7.7–8.9 V (typ. 8.5 V), falling threshold is 7.2–8.4 V (typ. 7.9 V), with 0.6 V hysteresis. This ensures stable gate drive activation only after secondary supplies reach safe operating levels.