Texas Instruments UCC27284DRCT

Overview

UCC27284DRCT 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, and 12-ns/10-ns rise/fall times with 1.8-nF load. It enables high-efficiency synchronous buck and half-bridge topologies in merchant server PSUs and solar power optimizers.

For engineers reviewing the UCC27284DRCT datasheet, UCC27284DRCT pinout, UCC27284DRCT application, or UCC27284DRCT equivalent, key selection criteria include its 100-V HS voltage rating, integrated bootstrap diode, 5-V UVLO, enable/disable functionality (DRC package), and –14-V negative voltage tolerance on HS - all critical for robust high-frequency switching in isolated DC-DC and motor drive systems.

Technical Context

The UCC27284DRCT implements independent TTL/CMOS-compatible inputs driving two fully isolated output stages: a low-side driver referenced to VSS and a floating high-side driver referenced to HS, enabled by a low-power, high-speed level shifter. Its architecture supports input overlap for secondary-side synchronous rectification without built-in dead-time insertion.

UVLO protection operates separately on VDD (5.0-V typical rising threshold) and HB–HS (3.7-V typical rising threshold), ensuring safe startup and fault response. The integrated bootstrap diode (VF = 0.85 V typ. at 80 mA) eliminates external discrete diodes while maintaining <16-V HB–HS differential compliance under transient conditions.

Key Specifications

Pinout & Package

UCC27284DRCT is housed in a 10-pin 3 mm × 3 mm SON (DRC) package with exposed thermal pad, optimized for high-density power layouts and thermal performance (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 UCC27284DRCT, UCC27282DRCT trades enable functionality and HV robustness for identical timing and package, while LM5109BSDX/NOPB offers HV capability in a larger, slower, diode-less package - making UCC27284DRCT optimal for compact, high-efficiency, fault-aware 100-V half-bridge designs.

Availability

UCC27284DRCT is available at Aetrix Electronics and suitable for merchant network/server PSU, solar power optimizer, and DC-input BLDC motor drive applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for UCC27284DRCT 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 delivering analog, embedded processing, and power management solutions with deep expertise in high-reliability power conversion ICs.

The UCC27284 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 telecom, server, and renewable energy systems.

FAQ

What is the maximum allowable voltage on the HS pin of the UCC27284DRCT?

The UCC27284DRCT specifies an absolute maximum HS voltage of 100 V DC with respect to VSS, and tolerates –14 V transients (pulse width <100 ns). Operation beyond these limits risks permanent damage. The recommended operating range is –8 V to 100 V DC, with strict adherence to the HB–HS differential limit of ≤16 V to prevent latch-up.

Does the UCC27284DRCT require an external bootstrap diode?

No, the UCC27284DRCT integrates a bootstrap diode with 0.85-V forward voltage at 80 mA. An external diode is unnecessary in standard configurations. However, if HB–HS exceeds 16 V during transients or if higher current charging is needed, an external Schottky diode may be added - though this negates one of the key BOM-reduction benefits of the UCC27284DRCT.

Is the EN pin available on all UCC27284 package variants?

No - the EN pin is exclusive to the DRC (10-pin 3 mm × 3 mm SON) package, as confirmed in the device information table and pin configuration diagrams. The DRM (8-pin) and DPR (10-pin 4 mm × 4 mm) variants do not include the EN pin; only UCC27284DRCT provides enable/disable functionality.

What is the purpose of the NC pin on the UCC27284DRCT?

The NC (pin 2) on the UCC27284DRCT is internally unconnected and serves no electrical function. Per TI's layout guidelines, it should be left floating or connected to VSS for mechanical stability and thermal relief - never driven or used as a signal path. Its presence is due to package pinout compatibility across the UCC2728x family.

How does the UCC27284DRCT handle negative voltage transients on the HS node?

The UCC27284DRCT tolerates –14 V on HS (for <100 ns pulses) and –8 V continuously, enhancing robustness against ringing caused by PCB parasitics. This is achieved via hardened level-shifter design and input/output structures. To maintain reliability, HB voltage must be limited so that HB–HS ≤ 16 V - e.g., if HS swings to –5 V, VDD (and thus HB) must stay ≤11 V.