UCC27289DR

Overview of Texas Instruments UCC27289DR

The Texas Instruments UCC27289DR is a high-speed, dual low-side gate driver designed to drive two N-channel MOSFETs or IGBTs in synchronous buck converters, half-bridge, and full-bridge applications. This device belongs to TI’s family of isolated gate drivers that deliver fast switching speeds and robust output drive capability while providing comprehensive protection and reliability features. The UCC27289DR is optimized for driving MOSFETs in power supply, motor control, and automotive electronics where efficiency, switching performance, and reliability are critical.

Key Features

* Dual low-side high-speed gate driver optimized for N-channel MOSFETs or IGBTs.
* High peak source and sink current capability of 4 A each, enabling rapid MOSFET switching.
* Wide supply voltage range from 4.5 V to 18 V to accommodate various MOSFET gate drive voltages.
* Propagation delay of typically 35 ns, ensuring precise timing for efficient switching.
* Under-voltage lockout (UVLO) with hysteresis on the supply pin to prevent MOSFET damage from insufficient gate drive voltage.
* Cross-conduction prevention logic minimizes shoot-through currents.
* Separate inputs for each channel for independent control.
* CMOS-compatible input logic thresholds for easy interfacing with microcontrollers and digital logic.
* Operating temperature range of -40°C to +125°C, making it suitable for automotive and industrial environments.
* Available in a compact 8-pin SOIC package suitable for space-constrained designs.
* High noise immunity and robust switching capabilities ideal for power converters with high dv/dt switching conditions.

Electrical Specifications

* Supply Voltage (VCC): 4.5 V to 18 V, allowing flexible application across multiple power supply rails.
* Output Peak Source Current: 4 A typical at 10 V supply.
* Output Peak Sink Current: 4 A typical at 10 V supply.
* Propagation Delay: Typical 35 ns from input to output.
* Input Logic Levels: Compatible with 3.3 V and 5 V CMOS logic.
* Operating Temperature Range: -40°C to +125°C junction temperature.
* Supply Current: Typically 3 mA per channel during switching.
* Maximum Switching Frequency: Up to several hundred kHz depending on load and gate charge.
* Package: 8-pin SOIC (Small Outline Integrated Circuit) with thermal pad for heat dissipation.

Functional Description

The UCC27289DR serves as a dual-channel gate driver designed to efficiently control power MOSFETs or IGBTs used in synchronous rectification or bridge configurations. Each channel provides a dedicated output that delivers high peak currents to rapidly charge and discharge the MOSFET gate capacitance, minimizing switching losses and improving efficiency.

The device features built-in cross-conduction prevention, ensuring that both outputs cannot be on simultaneously, thus preventing shoot-through current that could damage the MOSFETs and reduce efficiency. The inputs accept standard CMOS logic levels, simplifying the interface with microcontrollers or digital signal processors.

Under-voltage lockout circuitry ensures that the device only enables output driving when the supply voltage exceeds a safe threshold, protecting MOSFETs from incomplete switching states. The device is designed to maintain signal integrity and timing even in noisy environments with high dv/dt transitions typical in power converters.

Applications

* Synchronous buck converters for power supply regulation.
* Half-bridge and full-bridge drivers for motor control.
* Automotive DC-DC converters and powertrain electronics.
* High-frequency switching power supplies.
* Isolated gate drive applications where fast, reliable MOSFET switching is required.
* Industrial power systems and renewable energy converters.

Package and Pin Configuration

The UCC27289DR is housed in an 8-pin SOIC package featuring two input pins (IN1, IN2), two output pins (OUT1, OUT2), supply (VCC), ground (GND), and an enable pin (EN) for global control of both channels. The package includes a thermal pad to aid heat dissipation, critical for high-current switching operations.

Performance Highlights

* The ability to source and sink 4 A peak current per channel enables rapid switching of large MOSFET gates, reducing switching losses.
* Propagation delay as low as 35 ns ensures precise timing, improving converter efficiency and reducing electromagnetic interference.
* UVLO circuitry protects devices against undervoltage conditions, improving reliability.
* Cross-conduction prevention logic reduces power losses and device stress by avoiding simultaneous conduction.
* Wide operating voltage range supports flexibility in various power architectures.
* Compact package with thermal management allows for use in space-constrained designs with high thermal loads.

Summary of Specifications

| Parameter | Value |
| --------------------------- | ----------------------------- |
| Supply Voltage (VCC) | 4.5 V to 18 V |
| Peak Source Current | 4 A typical |
| Peak Sink Current | 4 A typical |
| Propagation Delay | 35 ns typical |
| Input Logic Levels | CMOS compatible (3.3 V / 5 V) |
| Operating Temperature | -40°C to +125°C |
| Supply Current | ~3 mA per channel |
| Maximum Switching Frequency | Up to several hundred kHz |
| Package | 8-pin SOIC with thermal pad |

The Texas Instruments UCC27289DR provides a robust, high-speed dual gate driver solution ideal for driving high-current MOSFETs in demanding automotive and industrial applications. Its combination of fast switching, strong output drive, protection features, and compact packaging enables designers to build efficient and reliable power conversion and motor control systems.