Texas Instruments UCC27444DR

Overview

UCC27444DR from Texas Instruments is a dual-channel, low-side MOSFET/GaN gate driver IC with 4-A peak source/sink current per channel, 18-ns typical propagation delay, and –5-V input tolerance on INA/INB pins-designed for high-frequency SMPS, PFC, and DC/DC converters where precise timing and noise immunity are critical.

For engineers reviewing the UCC27444DR datasheet, UCC27444DR pinout, UCC27444DR application, or UCC27444DR equivalent, this page delivers verified package mapping (SOIC-8), confirmed dual-enable logic, measured 1-ns inter-channel delay matching, and real-world thermal performance data (R_θJA = 131.1°C/W in SOIC) to support layout, reliability, and system-level timing validation.

Technical Context

The UCC27444DR implements independent TTL-compatible input stages with fixed 1.2 V/2.2 V thresholds and internal 100-kΩ pullups on ENA/ENB, enabling direct interfacing with 3.3-V/5-V controllers without level shifting. Its P-channel/N-channel MOS output stage delivers rail-to-rail drive (0 V to VDD) with 1.2 Ω pullup and 0.7–1.2 Ω pulldown resistance.

Each channel features dedicated enable control and supports simultaneous switching of paralleled power devices via 1-ns typical delay matching. The device incorporates power-on reset (POR) with 2.1–4.0 V rising threshold and tolerates transient reverse currents up to ±4 A on outputs-critical for gate-transformer-driven topologies and noisy ground-bounce environments.

Key Specifications

Pinout & Package

UCC27444DR is available in SOIC-8 (D package, 4.90 mm × 3.91 mm) with exposed thermal pad connected to GND. Pin numbering follows standard SOIC top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27444DR, UCC27524ADR trades noise robustness for legacy compatibility, while LM5113MMX/NOPB sacrifices timing precision and control granularity for integration simplicity-making UCC27444DR the optimal choice for high-reliability, high-frequency, and fault-tolerant power stages.

Availability

UCC27444DR is available at Aetrix Electronics and suitable for switched-mode power supplies, power factor correction circuits, and DC fast charging stations requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for UCC27444DR 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 over 90 years of innovation in high-reliability electronic components.

The UCC27444DR belongs to TI's high-speed gate driver product line, engineered specifically for high-efficiency, high-frequency power conversion systems-including GaN-based SMPS, PFC, and EV infrastructure-where timing accuracy, noise immunity, and thermal robustness are non-negotiable.

FAQ

What is the maximum allowable VDD voltage for the UCC27444DR?

The absolute maximum VDD voltage for the UCC27444DR is 20 V, as specified in Section 6.1 of the datasheet. Operation beyond this limit risks permanent damage. For reliable long-term use, the recommended operating range is 4.5 V to 18 V. At 18 V, the device delivers full 4-A peak drive capability while maintaining thermal stability within its 125°C junction limit in SOIC-8 packaging.

Does the UCC27444DR support gate drive transformer interfaces?

Yes, the UCC27444DR supports direct connection to gate drive transformers due to its –5-V input tolerance on INA/INB and ±4-A output reverse current capability. Its rail-to-rail output swing and low 1.2 Ω pullup resistance enable efficient transformer primary drive without external rectification-reducing BOM count and PCB area in isolated half-bridge or push-pull configurations.

How does the enable function behave when left unconnected on the UCC27444DR?

When ENA or ENB is left floating on the UCC27444DR, the internal 100-kΩ pullup resistor biases the pin high, enabling the corresponding output channel by default. This behavior ensures functional operation without external pullups and provides pin compatibility with legacy TI drivers like UCC27424. However, TI recommends tying unused enable pins to VDD for deterministic operation in noisy environments.

What thermal performance can be expected from the UCC27444DR in SOIC-8 packaging?

In SOIC-8 (D package), the UCC27444DR has a junction-to-ambient thermal resistance (R_θJA) of 131.1°C/W and a junction-to-board resistance (R_θJB) of 74.6°C/W when the thermal pad is soldered to a 1-in² copper area. With proper PCB layout-including 2 oz copper, thermal vias, and minimal trace length-the device sustains continuous 4-A drive at 125°C ambient without derating, validated across –40°C to 125°C operating range.

Is the UCC27444DR compatible with 3.3-V microcontroller PWM outputs?

Yes, the UCC27444DR is fully compatible with 3.3-V microcontroller PWM outputs. Its INA/INB inputs feature fixed TTL-compatible thresholds (1.2 V low, 2.2 V high), independent of VDD, ensuring reliable recognition of 3.3-V logic levels across the full 4.5–18-V supply range. No level-shifting circuitry is required, simplifying interface design and reducing propagation delay uncertainty.