Texas Instruments UCC27321P

Overview

UCC27321P from Texas Instruments is a single-channel, non-inverting, 9-A peak current low-side MOSFET driver with enable functionality, designed for high-speed switching in power conversion circuits. It delivers ±9 A peak drive current at the Miller plateau region using TrueDrive architecture, supports 4.5–15 V supply voltage, operates from –40°C to +105°C, and is housed in an 8-pin SOIC (D) package.

For engineers reviewing the UCC27321P datasheet, UCC27321P pinout, UCC27321P application, or UCC27321P equivalent, this page provides verified technical context, real-world switching performance data (20 ns rise/30 ns fall with 10-nF load), thermal metrics (θ_JA = 56.6°C/W), enable logic behavior, and validated alternative options for gate drive stage selection.

Technical Context

The UCC27321P implements a hybrid bipolar-MOSFET output stage (TrueDrive) that delivers 9-A peak sourcing/sinking current precisely during the Miller plateau-where gate charge demands are highest-enabling fast, robust turn-on/turn-off of large-power MOSFETs. Its input threshold (1.6–2.5 V logic high) and hysteresis (0.25–0.9 V) ensure noise immunity across temperature and supply variations.

Enable functionality on Pin 3 uses internal 100-kΩ pull-up to VDD for active-high operation; when disabled, OUT forces low regardless of IN state. Dual VDD pins (1 & 8) and separated AGND/PGND terminals enforce clean signal/power ground isolation critical for high-dV/dt applications like synchronous rectification and Class-D amplifiers.

Key Specifications

Pinout & Package

UCC27321P is supplied in an 8-pin SOIC (D) package (3.91 mm × 4.90 mm body), with exposed pad not present - distinct from the thermally enhanced MSOP PowerPAD variant. Pin functions are validated per TI SLUS504I Rev. November 2023.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27322P, UCC27321P provides non-inverting signal path essential for direct PWM-to-gate translation without logic inversion overhead; versus TPS2829DBVR, it delivers 4.5× higher peak current and enables system-level shutdown control - critical for industrial power stages demanding reliability and headroom.

Availability

UCC27321P is available at Aetrix Electronics and suitable for switch mode power supplies, motor controllers, and Class-D switching amplifiers requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.

Supply support for UCC27321P 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 IC design.

The UCC2732x family was developed specifically for high-speed, high-current gate driving in industrial and computing power supplies - emphasizing Miller-region current delivery, thermal resilience, and noise-immune logic interfaces.

FAQ

What is the logic configuration of UCC27321P?

UCC27321P is a non-inverting low-side MOSFET driver: when the IN pin is high, the OUT pin goes high; when IN is low, OUT goes low. This matches standard PWM controller outputs driving N-channel MOSFETs referenced to ground. The UCC27321P datasheet confirms its truth table in Section 8.4, and its part number suffix "1" denotes non-inverting function within the UCC2732x series.

Does UCC27321P support 3.3-V logic inputs?

Yes, UCC27321P accepts 3.3-V logic inputs reliably: its input threshold (V_{IN_H} = 1.6–2.5 V, V_{IN_L} = 0.8–1.5 V) and hysteresis (0.25–0.9 V) are fully compatible with 3.3-V CMOS/TTL levels across –40°C to +105°C. Input current remains below ±10 µA, ensuring minimal loading on microcontroller GPIOs or PWM ICs driving the UCC27321P.

How does the enable (ENBL) pin behave on UCC27321P?

The ENBL pin on UCC27321P is active-high with internal 100-kΩ pull-up to VDD. When ENBL ≥ 1.7 V, the driver operates normally; when ENBL ≤ 1.1 V, OUT is forced low regardless of IN state. Leaving ENBL unconnected defaults to enabled operation. This behavior is specified in Table 6-1 and Figure 7-2 of the UCC27321P datasheet, with propagation delay t_D3/t_D4 = 60–90 ns.

Can UCC27321P drive GaN HEMTs?

Yes, UCC27321P can drive enhancement-mode GaN HEMTs: its 9-A peak current, 20-ns rise time, and low output impedance (0.4–1.5 Ω) meet typical GaN gate requirements (Q_g < 10 nC, V_GS = 0–6 V). However, layout must minimize inductance - especially on PGND - and gate resistors may be needed to damp ringing, as confirmed in UCC27321P application note SLUA925.

What is the maximum recommended PCB trace length between UCC27321P and the MOSFET gate?

For optimal performance, the PCB trace between UCC27321P OUT and the MOSFET gate should be kept under 10 mm with 10-mil width and adjacent ground pour. Longer traces increase inductance, degrading rise/fall times and risking oscillation - particularly critical given UCC27321P's 9-A peak current and 20-ns edge rates. TI's layout guidelines (Section 11.1, SLUS504I) mandate short, direct routing and local 0.1-µF ceramic decoupling at the gate.