Texas Instruments UCC37322P

Overview

UCC37322P from Texas Instruments is a noninverting 9-A peak-current low-side MOSFET driver in 8-pin PDIP package, delivering ±9 A drive at the Miller plateau with 20-ns rise/fall times (10-nF load) and 4–15-V supply range. It integrates an active-high enable pin (pin 3), true bipolar-CMOS hybrid output stage (TrueDrive), and operates across –40°C to +105°C for high-reliability power switching.

For engineers reviewing the UCC37322P datasheet, UCC37322P pinout, UCC37322P application, or UCC37322P equivalent, this page delivers verified technical context, validated pin functions, real-world switching performance metrics, thermal resistance data (θ_jc = 45.3°C/W), and confirmed alternative options for gate driver selection in SMPS, motor control, and Class-D amplifier designs.

Technical Context

The UCC37322P implements a noninverting logic architecture with dedicated ENBL input (internally pulled up to VDD via 100-kΩ resistor), enabling/disabling the output regardless of IN state - output forces low when disabled. Its TrueDrive output stage combines bipolar and MOSFET transistors in parallel to deliver asymmetric ±9-A peak current, optimized specifically for Miller plateau charging/discharging during high-dV/dt transitions.

This architecture enables efficient gate drive down to 4.5 V supply while maintaining sub-35-ns propagation delay (IN rising → OUT) and 20–30-ns fall time. Dual ground separation (AGND for logic, PGND for power path) minimizes noise coupling, requiring direct thick-trace connection between AGND and PGND under the device.

Key Specifications

Pinout & Package

UCC37322P is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 0.300-inch body width and through-hole mounting. Thermal resistance is R_θJA = 55.9°C/W and R_θJC = 45.3°C/W (bottom), supporting up to 350 mW power dissipation at T_A = 70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC37322P, UCC37322D offers superior thermal management in compact SMT designs, while TPS2829DBVR trades peak current and enable functionality for ultra-small size and lower BOM cost - neither is pin-compatible, but both serve distinct power-tier requirements.

Availability

UCC37322P is available at Aetrix Electronics and suitable for switch mode power supplies, motor controllers, and Class-D switching amplifiers requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for UCC37322P 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 over 50 years of innovation in high-reliability power conversion solutions.

The UCC37322P belongs to TI's UCC3732x family of high-speed low-side gate drivers, engineered specifically for extreme Miller current demands in high-frequency, high-efficiency power systems - targeting SMPS, motor drives, and audio amplifiers.

FAQ

What is the logic configuration of the UCC37322P?

The UCC37322P is a noninverting low-side MOSFET driver: when the IN pin is high and ENBL is high, the OUT pin goes high; when IN is low (and ENBL high), OUT goes low. This behavior is confirmed in Table 8-1 of the official datasheet and distinguishes it from the inverting UCC37321P. The UCC37322P maintains this logic across its full –40°C to +105°C operating range and 4.5–15-V supply window.

Does the UCC37322P require external pull-up or pull-down resistors on the ENBL pin?

No - the UCC37322P features an internal 100-kΩ pull-up resistor connecting ENBL to VDD, making it active-high by default. Leaving ENBL unconnected enables normal operation; pulling it low disables the output (forcing OUT low regardless of IN state). External resistors are unnecessary unless implementing RC-based power-up sequencing or noise filtering, per Section 8.3.4 of the datasheet.

Can the UCC37322P drive multiple parallel MOSFETs?

Yes - the UCC37322P's ±9-A peak output current and low 0.4–0.6-Ω output resistance allow reliable driving of multiple paralleled MOSFETs, provided total gate charge (Q_g) remains within the driver's energy delivery capability. For example, it can drive three 50-nC MOSFETs simultaneously at 200 kHz with <50-ns total propagation skew, as verified in TI's SLUS504I application curves (Figures 7-9 to 7-10).

What is the maximum safe operating frequency for the UCC37322P?

The UCC37322P supports effective switching frequencies up to 2 MHz in hard-switched applications, limited primarily by propagation delay (25–35 ns) and rise/fall times (20 ns). At 500 kHz with 10-nF load, measured t_R/t_F remains ≤25 ns (Figure 7-7), confirming suitability for high-frequency LLC resonant converters and advanced modulation schemes requiring tight timing control.

How does the dual-ground (AGND/PGND) design improve noise immunity in the UCC37322P?

The UCC37322P separates AGND (for IN/ENBL logic) from PGND (for OUT power return) to prevent high-di/dt switching currents from modulating input thresholds. As specified in Table 6-1, AGND and PGND must connect via a single thick trace directly under the device - this layout practice reduces ground bounce to <150 mV even during 9-A transients, preserving TTL-compatible logic margins and preventing false triggering.