Texas Instruments UCC27322D

Overview

UCC27322D from Texas Instruments is a non-inverting 9-A peak-current low-side MOSFET driver in an 8-pin SOIC (D) package, delivering ±9 A drive at the Miller plateau with 20-ns rise/fall times (10-nF load), 25/35-ns propagation delays (falling/rising input), and 4.5–15-V supply operation. It enables fast, robust gate driving for high-dV/dt power switching stages in DC-DC converters and motor controllers.

For engineers reviewing the UCC27322D datasheet, UCC27322D pinout, UCC27322D application, or UCC27322D equivalent, key selection criteria include its non-inverting logic, enable-controlled output disable (low-state hold), TrueDrive hybrid bipolar-CMOS output stage, thermal resistance of 42°C/W (θ_jc), and compatibility with industrial temperature range (–40°C to +105°C).

Technical Context

The UCC27322D implements a non-inverting digital buffer with active-high enable (ENBL on pin 3), internally pulled up to VDD via 100-kΩ resistor. Its TrueDrive output stage combines bipolar and MOSFET transistors in parallel to deliver ±9-A peak current specifically during the Miller plateau region, minimizing switching losses in high-speed power MOSFETs.

Input thresholds are TTL/CMOS-compatible across 4.5–15-V VDD (VIN_H = 1.6–2.5 V, VIN_L = 0.8–1.5 V), with hysteresis (0.25–0.9 V) and ESD protection (±2000-V HBM). The dual VDD pins (1 & 8) and separated AGND/PGND grounds support noise-isolated layout for high-di/dt gate drive paths.

Key Specifications

Pinout & Package

UCC27322D is housed in an 8-pin SOIC (D) package (3.91 mm × 4.90 mm) with exposed thermal pad not connected internally; θ_jc = 42°C/W. 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 UCC27321D and UCC37322D, the UCC27322D uniquely combines non-inverting logic, industrial temperature rating, and pin-compatible enable functionality-making it the default choice for new high-reliability power designs where signal polarity and thermal margin are critical.

Availability

UCC27322D 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 lifecycle support, and guaranteed industrial temperature performance.

Supply support for UCC27322D 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 ICs, with decades of expertise in high-performance power conversion solutions.

The UCC27322D belongs to TI's UCC2732x family of high-speed low-side drivers, designed specifically to replace discrete gate drive circuits in high-efficiency, high-frequency power systems demanding ±9-A peak current and sub-50-ns timing precision.

FAQ

What is the logic configuration of the UCC27322D?

The UCC27322D 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 UCC27322D differs from the inverting UCC27321D, and its logic behavior is confirmed in Table 8-1 of the official SLUS504I datasheet. No external inversion is needed when interfacing with typical microcontrollers or PWM ICs.

Does the UCC27322D require external pull-up or pull-down resistors on the ENBL pin?

No, the UCC27322D features an internal 100-kΩ pull-up resistor on the ENBL pin, enabling active-high operation by default. Leaving ENBL unconnected results in enabled operation. An external pull-down is only needed if active-low enable functionality is required-though that would necessitate additional logic, as the device does not support native active-low enable. The internal pull-up ensures fail-safe startup behavior in the UCC27322D.

What is the maximum capacitive load the UCC27322D can drive while maintaining specified rise/fall times?

The UCC27322D's 20-ns typical rise/fall times are characterized with a 10-nF load, per Section 7.6 of the SLUS504I datasheet. Performance degrades predictably with higher capacitance: Figure 7-9 shows t_R ≈ 35 ns at 20 nF (VDD = 15 V), and Figure 7-10 shows t_F ≈ 70 ns under same conditions. For loads exceeding 20 nF, external gate resistors may be needed to manage EMI or limit peak current-but the UCC27322D itself remains functional up to its absolute max output current rating.

How are the dual VDD pins (1 and 8) used in the UCC27322D?

Pins 1 and 8 of the UCC27322D are both VDD inputs and must be externally shorted together on the PCB. Each pin requires its own 0.1-µF ceramic decoupling capacitor: one between pin 1 and AGND, and another between pin 8 and PGND. This dual-supply-pin architecture reduces power delivery impedance and improves high-frequency stability-critical for sustaining 9-A transients without VDD droop or oscillation in the UCC27322D.

Is the UCC27322D pin-compatible with older TI drivers like the UCC37322D?

Yes, the UCC27322D is fully pin-compatible with the UCC37322D and UCC27321D in the 8-pin SOIC (D) package-including identical pin numbering, function mapping, and footprint. The key distinction is temperature rating: UCC27322D is qualified for –40°C to +105°C, whereas UCC37322D is rated only for 0°C to +70°C. Electrical specs, timing, and enable functionality are identical-enabling drop-in replacement in industrial designs requiring extended thermal margin.