Texas Instruments UCC27425D

Overview

UCC27425D from Texas Instruments is a dual low-side MOSFET driver with one inverting (OUTA) and one non-inverting (OUTB) output channel, ±4-A peak source/sink current, 20-ns rise / 15-ns fall time (1.8-nF load), 4–15-V supply range, and integrated enable inputs (ENBA/ENBB) for independent channel control - used to drive N- and P-channel power MOSFETs in synchronous buck or half-bridge gate-drive stages.

For engineers reviewing the UCC27425D datasheet, UCC27425D pinout, UCC27425D application, or UCC27425D equivalent, key selection criteria include verified Miller-region drive capability, enable-controlled channel isolation, SOIC-8 thermal performance (107.3°C/W R_θJA), and logic compatibility across 3.3-V/5-V microcontroller interfaces.

Technical Context

The UCC27425D implements a bipolar-MOSFET hybrid output stage that delivers ±4-A peak current specifically during the MOSFET Miller plateau transition, minimizing switching losses. Its dual-output architecture supports independent enable control (ENBA on Pin 1, ENBB on Pin 8), with internal 100-kΩ pull-ups enabling standard operation when left floating.

Input thresholds (VIN_H = 1.6–2.5 V, VIN_L = 0.8–1.5 V) and hysteresis (0.15–0.90 V) ensure noise immunity across –40°C to 125°C operation, while TTL/CMOS compatibility holds regardless of VDD (4–15 V). Propagation delays are asymmetric: 25 ns (input falling → output) and 35 ns (input rising → output), reflecting optimized edge handling for PWM-driven topologies.

Key Specifications

Pinout & Package

UCC27425D is housed in an 8-pin SOIC (D) package with exposed pad not connected - thermal path relies on PCB copper area under the body. Pin 3 (GND) serves as common reference for both drivers and must be routed with low-inductance connection to MOSFET source.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27425DGN, the UCC27425D trades 2× worse thermal resistance for plug-compatible SOIC-8 placement and simplified reflow; versus LM5113SD, it provides true dual-channel logic flexibility and lower static power, but at reduced peak current density and larger footprint.

Availability

UCC27425D is available at Aetrix Electronics and suitable for switch mode power supplies, DC/DC converters, and motor controllers requiring stable component supply, long-term industrial lifecycle support, and TI-authorized traceability.

Supply support for UCC27425D 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 designing analog ICs, embedded processors, and system solutions for industrial, automotive, and communications markets since 1930.

The UCC27425D belongs to TI's high-speed power driver product line, engineered specifically for efficient, robust gate driving of power MOSFETs and IGBTs in high-frequency switching applications - emphasizing Miller-region current delivery, thermal resilience, and logic-level interoperability.

FAQ

What is the function of ENBA and ENBB on the UCC27425D?

ENBA (Pin 1) and ENBB (Pin 8) are active-high enable inputs that independently control OUTA and OUTB. When pulled low, each output is forced low regardless of its input state. Internally pulled up to VDD via 100-kΩ resistors, they allow standard operation when left floating - but short PCB traces or 0.1-µF filtering is recommended in noisy environments. This functionality is integral to UCC27425D's use in fault-tolerant motor control and soft-start power sequencing.

Can the UCC27425D drive both N-channel and P-channel MOSFETs simultaneously?

Yes - the UCC27425D's unique one-inverting (OUTA) and one-non-inverting (OUTB) output configuration enables direct drive of complementary P- and N-channel MOSFETs in half-bridge or synchronous buck topologies. OUTA sources current to turn on P-channel devices, while OUTB sinks current for N-channel devices. This eliminates external inverters and preserves timing alignment, a core design advantage of the UCC27425D versus dual-inverting or dual-non-inverting variants.

What is the maximum capacitive load the UCC27425D can drive while maintaining specified rise/fall times?

The UCC27425D's 20-ns rise and 15-ns fall times are characterized with a 1.8-nF load. While it can drive larger loads (e.g., 10-nF), timing degrades predictably: rise time increases to ~40 ns and fall time to ~40 ns at 10-nF. For designs exceeding 1.8-nF, external gate resistors may be added to control dv/dt and suppress ringing - a documented practice in UCC27425D application notes to maintain reliability without compromising UCC27425D's ±4-A peak capability.

Does the UCC27425D require external bootstrap components when used in high-side configurations?

No - the UCC27425D is strictly a low-side driver and does not support high-side floating operation. It lacks bootstrap diode integration, charge pump, or level-shifting circuitry. To drive high-side N-channel MOSFETs, UCC27425D must be paired with a dedicated high-side driver (e.g., UCC27201) or used in conjunction with a gate-drive transformer or isolated DC/DC supply. This limitation is inherent to UCC27425D's architecture and is clearly defined in its device family documentation.

How does the UCC27425D's bipolar-MOSFET hybrid output stage improve efficiency compared to standard CMOS drivers?

The UCC27425D's hybrid stage combines bipolar transistors (for high-current Miller-region delivery) and MOSFETs (for low-R_DS(on) steady-state conduction), delivering ±4-A precisely where gate charge demand peaks - during the Miller plateau (V_GS ≈ 4–6 V). Standard CMOS drivers exhibit current droop in this region, increasing switching time and conduction loss. This targeted current delivery reduces total gate charge time by up to 25%, directly improving efficiency in UCC27425D-based 500-kHz+ converters.