Texas Instruments UCC27284DRMR

Overview

UCC27284DRMR from Texas Instruments is a 3-A, 120-V half-bridge gate driver IC for N-channel MOSFETs in high-side/low-side configuration, featuring ±3-A peak output current, 16-ns typical propagation delay, 12-ns rise/10-ns fall time (1.8-nF load), and –14-V negative voltage tolerance on HS. It enables high-efficiency synchronous buck and half-bridge topologies in server PSUs and solar optimizers.

For engineers reviewing the UCC27284DRMR datasheet, UCC27284DRMR pinout, UCC27284DRMR application, or UCC27284DRMR equivalent, this page delivers verified technical context, package-specific pin functions, real-world timing behavior under load, thermal performance in DRC (3 mm × 3 mm SON), and validated alternative drivers for high-voltage gate drive systems.

Technical Context

The UCC27284DRMR implements independent TTL/CMOS-compatible HI/LI inputs driving dual totem-pole NMOS-PMOS output stages - low-side referenced to VSS, high-side referenced to HS - with integrated level-shifting enabling operation up to 100-V HS voltage. Its robustness includes –14-V HS transient tolerance and –5-V input tolerance.

UVLO is implemented separately on VDD (5.0-V typical rising threshold) and HB–HS (3.7-V typical rising threshold), ensuring safe startup and fault isolation. The DRC package includes an enable (EN) pin with 250-kΩ internal pulldown, 1.5-μs disable delay, and 18-μs enable delay - critical for system-level fault response coordination.

Key Specifications

Pinout & Package

UCC27284DRMR is packaged in a 10-pin 3 mm × 3 mm SON (DRC) with exposed thermal pad, optimized for high-density power designs and thermal dissipation (R_θJA = 47.3°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge gate driver applications.

Compared with UCC27284DRMR, UCC27282DRMR removes EN control but retains identical drive performance and thermal specs, while LM5109BSDX/NOPB trades integration and package size for broader vendor availability and lower unit cost at reduced current capability.

Availability

UCC27284DRMR is available at Aetrix Electronics and suitable for merchant server PSUs, solar power optimizers, and DC-input BLDC motor drives requiring stable component supply, extended temperature operation, and high-reliability gate drive performance.

Supply support for UCC27284DRMR 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 decades of expertise in high-reliability power conversion solutions.

The UCC27284DRMR belongs to TI's high-voltage gate driver product line, engineered specifically for efficient, robust control of N-channel MOSFETs in half-bridge and synchronous buck topologies across industrial, computing, and renewable energy applications.

FAQ

What is the maximum allowable voltage difference between HB and HS pins on the UCC27284DRMR?

The UCC27284DRMR specifies a maximum HB–HS voltage of 16 V under recommended operating conditions. Exceeding this risks activating parasitic structures, potentially causing excessive current flow from the HB supply and device damage. For example, if HS swings to –5 V during transient, VDD (and thus HB) must be limited to ≤11 V to maintain compliance. This constraint is explicitly defined in Section 6.3 of the datasheet.

Does the UCC27284DRMR support overlapping HI and LI signals for synchronous rectification?

Yes, the UCC27284DRMR supports overlapping HI and LI inputs - its independent input architecture allows simultaneous high states on both inputs, resulting in concurrent HO and LO high outputs. This capability is explicitly cited in the Description section and enables use in secondary-side full-bridge synchronous rectification, where controlled overlap minimizes conduction losses without shoot-through risk.

What is the purpose of the EN pin on the UCC27284DRMR, and how does it behave when left unconnected?

The EN pin on the UCC27284DRMR (DRC package only) enables or disables both gate outputs. When left floating, the internal 250-kΩ pulldown resistor pulls EN to VSS, disabling the driver and forcing HO/LO low. This fail-safe behavior ensures no unintended gate drive during power-up or controller initialization. A 1-nF capacitor to VSS is recommended in noisy environments to suppress false triggering.

How does the UCC27284DRMR handle negative voltage transients on the HS pin?

The UCC27284DRMR tolerates –14-V transients on the HS pin for pulses shorter than 100 ns, as specified in Absolute Maximum Ratings. This capability improves system robustness in hard-switching applications where board parasitics cause HS undershoot before the low-side MOSFET body diode clamps. However, HS must always remain at a lower potential than HO to avoid parasitic conduction - external Schottky clamping may be added if needed.

Is the bootstrap diode in the UCC27284DRMR sufficient for all applications, or is an external diode ever required?

The integrated bootstrap diode in the UCC27284DRMR is sufficient for most applications, with 0.85-V forward drop at 80 mA and 2.5-Ω dynamic resistance. However, external diodes may be preferred in ultra-high-reliability or high-temperature (>125°C) designs where long-term diode degradation is a concern, or when HB–HS voltage approaches 16 V - the internal diode's leakage (5 μA at 100 V) increases with temperature and could affect bootstrap hold-up time in marginal cases.