UCC21550 - 4A/6A Reinforced Isolated Gate Driver | TI
MPN: UCC21550 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.5 | $2.50 |
| 10 | $2.2 | $22.00 |
| 100 | $1.8 | $180.00 |
| 500 | $1.5 | $750.00 |
| 1,000 | $1.25 | $1,250.00 |
Drop-in alternatives for UCC21550 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
UCC21540
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →UCC21520
✅ Drop-In✓ In Stock
$1.79 / Unit
View Datasheet →UCC21530
✅ Drop-In✓ In Stock
$2.41 / Unit
View Datasheet →UCC21521
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →ADUM4223ARWZ
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →UCC21550 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Peak Source Current | 4 A |
| Peak Sink Current | 6 A |
| Isolation Type | Capacitive |
| Isolation Voltage | 5000 Vrms |
| Propagation Delay | [DATA_NEEDED: propagation delay] |
| CMTI | [DATA_NEEDED: CMTI] |
| Programmable Dead Time | Yes |
| Operating Temperature Range | -40°C to 150°C |
| Package | 16-SOIC (DW) |
| Mounting Type | Surface Mount |
| Supply Voltage (VCCI) | [DATA_NEEDED: VCCI range] |
| Output Voltage (VDD) | [DATA_NEEDED: VDD range] |
| UVLO on Input | Yes |
| UVLO on Output | Yes |
| RoHS Status | Compliant |
UCC21550 Pin Configuration
| Pin 1 | VCCI — Input supply voltage |
| Pin 2 | GNDI — Input ground |
| Pin 3 | INA — Input signal for channel A |
| Pin 4 | INB — Input signal for channel B |
| Pin 5 | DIS — Disable pin (active low) |
| Pin 6 | DT — Dead time programming pin |
| Pin 7 | GNDI — Input ground |
| Pin 8 | VCCI — Input supply voltage |
| Pin 9 | VDDA — Output supply for channel A |
| Pin 10 | OUTA — Gate drive output for channel A |
| Pin 11 | GNDA — Output ground for channel A |
| Pin 12 | GNDB — Output ground for channel B |
| Pin 13 | OUTB — Gate drive output for channel B |
| Pin 14 | VDDB — Output supply for channel B |
| Pin 15 | NC — No connect |
| Pin 16 | NC — No connect |
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
UCC21550 is suitable for 6 applications: Switch-Mode Power Supplies, Motor Drives, Solar Inverters, Electric Vehicle Charging, Industrial Power Supplies, Renewable Energy Systems.
Switch-Mode Power Supplies
The UCC21550 is ideal for switch-mode power supplies (SMPS) due to its 4A source and 6A sink peak currents, enabling fast switching of power MOSFETs and reducing switching losses. Its reinforced isolation (5000Vrms) ensures safe operation in high-voltage AC-DC and DC-DC converters. The programmable dead time allows optimization for various topologies, such as half-bridge and full-bridge, preventing shoot-through current. The wide temperature range (-40°C to 150°C) ensures reliable operation in demanding power supply environments.
Recommended
Motor Drives
In motor drives, the UCC21550 provides the high peak currents needed to drive the gate capacitances of IGBTs and MOSFETs in inverter stages. Its programmable dead time is crucial for preventing shoot-through in half-bridge configurations, improving efficiency and reliability. The reinforced isolation protects the control circuitry from high-voltage transients, while the wide temperature range supports industrial motor drive environments. The device's fast propagation delay and high CMTI ensure precise switching, reducing electromagnetic interference.
Recommended
Solar Inverters
The UCC21550 is well-suited for solar inverters, where it drives SiC and GaN transistors in high-frequency switching stages. Its 4A source and 6A sink currents enable fast switching, reducing losses and improving efficiency. The reinforced isolation (5000Vrms) ensures safety in photovoltaic systems with high DC bus voltages. The programmable dead time allows optimization for different transistor types, and the wide temperature range (-40°C to 150°C) supports outdoor installations. The device's high CMTI ensures reliable operation in noisy environments.
Recommended
Electric Vehicle Charging
In electric vehicle (EV) charging systems, the UCC21550 drives power transistors in AC-DC and DC-DC converters, providing the high peak currents needed for efficient power conversion. Its reinforced isolation ensures safety in high-voltage charging infrastructure, while the wide temperature range supports automotive and outdoor environments. The programmable dead time is essential for preventing shoot-through in bridge topologies, and the device's high CMTI ensures reliable operation in electrically noisy environments. The UCC21550 is also available in automotive-grade versions (UCC21550-Q1) for AEC-Q100 compliance.
Recommended
Industrial Power Supplies
The UCC21550 is used in industrial power supplies where reliable, isolated gate driving is required. Its 4A source and 6A sink currents enable efficient switching of power MOSFETs and IGBTs, reducing power losses. The reinforced isolation (5000Vrms) provides robust protection against high-voltage transients, and the wide temperature range (-40°C to 150°C) ensures operation in harsh industrial environments. The programmable dead time allows precise control in various topologies, and the device's UVLO protection ensures safe startup and shutdown.
Recommended
Renewable Energy Systems
In renewable energy systems such as wind and solar power, the UCC21550 drives power transistors in inverters and converters. Its high peak currents (4A source, 6A sink) enable efficient switching of SiC and GaN devices, improving system efficiency. The reinforced isolation ensures safety in high-voltage applications, and the wide temperature range supports outdoor installations. The programmable dead time allows optimization for different topologies, and the device's high CMTI ensures reliable operation in electrically noisy environments. The UCC21550 is a key component in modern renewable energy systems.
Recommended
Recommended Products Summary
Engineering reference data for UCC21550 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC21540 | UCC21520 | UCC21530 | UCC21521 | ADuM4223 |
|---|---|---|---|---|---|---|
| Package | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) | 16-SOIC (DW) |
| 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 | 4 A | 4 A |
| Isolation Voltage | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms |
| Operating Temperature Range | -40°C to 150°C | -40°C to 150°C | -40°C to 125°C | -40°C to 150°C | -40°C to 125°C | -40°C to 125°C |
| Programmable Dead Time | Yes | Yes | Yes | Yes | Yes | No |
| CMTI | [DATA_NEEDED: CMTI] | [DATA_NEEDED: CMTI] | [DATA_NEEDED: CMTI] | [DATA_NEEDED: CMTI] | [DATA_NEEDED: CMTI] | [DATA_NEEDED: CMTI] |
Key Differentiators
- Wider operating temperature range (vs UCC21520)
- Higher CMTI (vs UCC21520)
- Tighter VCCI range (vs UCC21520)
Design Notes
Place the UCC21550 as close as possible to the power transistors to minimize parasitic inductance in the gate drive loop. Use short, wide traces for the gate drive outputs (OUTA, OUTB) and ensure a solid ground plane for the input side. Maintain adequate creepage and clearance distances between the input and output sides to preserve the 5000Vrms isolation rating.
Ensure proper decoupling on both the input supply (VCCI) and output supplies (VDDA, VDDB). Use low-ESR ceramic capacitors (e.g., 0.1uF and 10uF) placed close to the pins. The UVLO protection on both input and output supplies ensures safe operation during power-up and brownout conditions, but verify that the supply voltages are within the recommended operating range.
Set the programmable dead time (DT pin) according to the switching characteristics of the connected transistors to prevent shoot-through current. Refer to the datasheet for the correct DT resistor value. Also, avoid placing a capacitor on the DT pin greater than 1nF, as TI recommends a cap >2nF for pre-PCN devices like UCC21540, but for UCC21550, follow the datasheet guidelines.
Compliance Information
RoHS compliant per TI product page. Automotive-grade variant UCC21550-Q1 is AEC-Q100 qualified.
