UCC21540 - 4A/6A Reinforced Isolated Gate Driver | TI
MPN: UCC21540 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
Drop-in alternatives for UCC21540 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
UCC21540A
β Drop-Inπ Reference alternative (not in catalog)
UCC21541
β Drop-Inπ Reference alternative (not in catalog)
UCC21530
β Drop-Inβ In Stock
$2.41 / Unit
View Datasheet βUCC21520
β Drop-Inβ In Stock
$1.79 / Unit
View Datasheet βADUM4221ARWZ
β Drop-Inβ In Stock
$3.1 / Unit
View Datasheet βUCC21521
β Drop-Inβ In Stock
$1.82 / Unit
View Datasheet βUCC21540 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Peak Source Current | 4 A |
| Peak Sink Current | 6 A |
| Isolation Rating | 5700 Vrms |
| Isolation Technology | Capacitive |
| Channel-to-Channel Spacing | 3.3 mm |
| Output Side VDD Range | 6.5 V to 18 V |
| Primary Side UVLO | 8 V |
| Secondary Side UVLO | 6.5 V |
| Propagation Delay | [DATA_NEEDED: propagation delay] |
| Common Mode Transient Immunity (CMTI) | [DATA_NEEDED: CMTI] |
| Deadtime Programming | Yes (programmable via DT pin) |
| Disable Pin | Yes |
| Package | SOIC-14 (DWK) |
| Operating Temperature Range | [DATA_NEEDED: operating temperature range] |
| RoHS Status | Compliant |
UCC21540 Pin Configuration
| Pin 1 | VCCI β Primary side input supply |
| Pin 2 | GNDI β Primary side ground |
| Pin 3 | INA β Input A |
| Pin 4 | INB β Input B |
| Pin 5 | DIS β Disable pin (active high) |
| Pin 6 | DT β Deadtime programming pin |
| Pin 7 | GNDI β Primary side ground |
| Pin 8 | VDDA β Secondary side supply A |
| Pin 9 | OUTA β Output A |
| Pin 10 | GNDA β Secondary side ground A |
| Pin 11 | GNDB β Secondary side ground B |
| Pin 12 | OUTB β Output B |
| Pin 13 | VDDB β Secondary side supply B |
| Pin 14 | GNDI β Primary side ground |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
UCC21540 is suitable for 6 applications: Server and Telecom Power Supplies, Industrial Motor Drives, Solar Inverters, Electric Vehicle Onboard Chargers, High-Frequency Switching Converters, GaN Transistor Gate Drive.
Server and Telecom Power Supplies
The UCC21540 is ideal for server and telecom power supplies where high-frequency switching and high isolation are required. Its 4-A/6-A peak drive current enables efficient switching of power MOSFETs and IGBTs, while the 5.7-kVRMS isolation ensures safe operation in high-voltage bus architectures. The programmable deadtime helps optimize efficiency and reduce EMI in half-bridge and full-bridge topologies. With a wide VDD range of 6.5V to 18V, it can drive various power devices, making it a versatile choice for AC-DC and DC-DC converters in these applications.
Recommended
Industrial Motor Drives
In industrial motor drives, the UCC21540 provides robust gate drive for IGBTs and MOSFETs in inverter stages. Its high peak current (4-A source, 6-A sink) ensures fast switching, reducing switching losses and improving motor drive efficiency. The reinforced isolation (5.7-kVRMS) and 3.3-mm channel-to-channel spacing allow safe operation in high-voltage environments. The disable pin enables system-level fault protection, and the programmable deadtime prevents shoot-through in half-bridge configurations, enhancing reliability in demanding industrial applications.
Recommended
Solar Inverters
The UCC21540 is well-suited for solar inverters, where high isolation and efficient gate drive are critical. Its 5.7-kVRMS isolation rating ensures safe operation in photovoltaic systems with high DC bus voltages. The 4-A/6-A peak drive current enables fast switching of power MOSFETs and IGBTs, maximizing inverter efficiency. The programmable deadtime allows precise control of switching transitions, reducing EMI and improving system reliability. The wide VDD range supports various gate drive voltages, making it a flexible solution for different inverter topologies.
Recommended
Electric Vehicle Onboard Chargers
The UCC21540 is designed for electric vehicle onboard chargers, where high isolation and reliable gate drive are essential. Its reinforced isolation (5.7-kVRMS) meets the stringent safety requirements of automotive applications. The 4-A/6-A peak drive current enables efficient switching of power devices in AC-DC and DC-DC converter stages. The disable pin provides a means for system-level fault protection, and the programmable deadtime helps optimize efficiency and reduce EMI. The compact SOIC-14 package with 3.3-mm channel-to-channel spacing is ideal for space-constrained automotive designs.
Recommended
High-Frequency Switching Converters
The UCC21540 is optimized for high-frequency switching converters, such as LLC resonant converters and synchronous buck converters. Its fast propagation delay and high common-mode transient immunity (CMTI) ensure reliable operation at high switching frequencies. The 4-A/6-A peak drive current provides strong gate drive, reducing switching losses and improving efficiency. The programmable deadtime allows precise control of switching transitions, minimizing body diode conduction and EMI. This makes the UCC21540 an excellent choice for compact, high-density power supplies.
Recommended
GaN Transistor Gate Drive
The UCC21540 is specifically designed to drive GaN transistors, which require fast, high-current gate drive. Its 4-A/6-A peak drive current and fast propagation delay enable efficient switching of GaN devices at high frequencies. The programmable deadtime is crucial for half-bridge GaN configurations to prevent shoot-through. The wide VDD range (6.5V to 18V) accommodates the typical gate drive voltages for GaN transistors. The reinforced isolation ensures safe operation in high-voltage applications, making the UCC21540 a reliable choice for GaN-based power converters.
Recommended
Recommended Products Summary
Engineering reference data for UCC21540 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC21540A | UCC21541 | UCC21530 | UCC21520 | ADUM4221 |
|---|---|---|---|---|---|---|
| Package | SOIC-14 (DWK) | SOIC-14 (DWK) | SOIC-14 (DWK) | SOIC-14 (DWK) | SOIC-14 (DWK) | SOIC-14 (DWK) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Peak Source Current | 4 A | 4 A | 4 A | 4 A | 4 A | 4 A |
| Peak Sink Current | 6 A | 6 A | 6 A | 6 A | 6 A | 6 A |
| Isolation Rating | 5700 Vrms | 5700 Vrms | 5700 Vrms | 5700 Vrms | 5700 Vrms | 5000 Vrms |
| Output Side VDD Range | 6.5 V to 18 V | 6.5 V to 18 V | 6.5 V to 18 V | 6.5 V to 18 V | 6.5 V to 25 V | 4.5 V to 18 V |
| Programmable Deadtime | Yes | Yes | Yes | Yes | Yes | Yes |
| Disable Pin | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Reinforced isolation with 5.7-kVRMS rating (vs ADUM4221)
- Wider output-side VDD range (vs ADUM4221)
- Drop-in replacement with upgraded functionality (vs UCC21540A)
Design Notes
For the UCC21540, maintain at least 3.3-mm channel-to-channel spacing on the PCB to preserve the reinforced isolation rating. Use appropriate creepage and clearance distances based on the working voltage and pollution degree. Place the device with proper isolation barriers and avoid routing high-voltage traces under the IC. Refer to TI's layout guidelines for isolated gate drivers to ensure reliable operation.
The UCC21540 requires a stable VDD supply on the secondary side. Use a 0.1-uF ceramic capacitor close to each VDDA and VDDB pin, and a 1-uF bulk capacitor for transient currents. The primary side VCCI should also be decoupled with a 0.1-uF capacitor. Ensure the VDD voltage is within the 6.5V to 18V range to avoid UVLO shutdown.
When programming deadtime with the DT pin, use a resistor to GNDI to set the desired deadtime. Avoid leaving the DT pin floating, as this may cause unpredictable deadtime. Also, ensure the disable pin (DIS) is properly pulled low or high to avoid unintended output disabling. Refer to the datasheet for the correct resistor value and deadtime calculation.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 qualification not specified for this part.
