Texas Instruments UCC27424P

Overview

UCC27424P from Texas Instruments is a dual non-inverting low-side MOSFET driver delivering ±4 A peak output current per channel, 20-ns rise/15-ns fall times (1.8-nF load), and 4–15 V supply operation. It integrates independent enable inputs (ENBA/ENBB) on pins 1 and 8, supports parallel output configuration for 8-A drive, and is rated for –40°C to 125°C operation in PDIP-8 package.

For engineers reviewing the UCC27424P datasheet, UCC27424P pinout, UCC27424P application, or UCC27424P equivalent, this page delivers verified electrical specs, thermal metrics, truth-table behavior under enable control, Miller-region drive capability, and validated alternatives for SMPS, motor control, and Class D amplifier gate-drive designs.

Technical Context

The UCC27424P implements dual non-inverting logic outputs with TTL/CMOS-compatible inputs independent of VDD, enabling direct interface with 3.3-V or 5-V PWM controllers. Its BiPolar–MOSFET hybrid output stage delivers high sourcing/sinking current precisely at the MOSFET Miller plateau, minimizing switching losses.

Each channel features independently enabled operation via ENBA (pin 1) and ENBB (pin 8), internally pulled up to VDD (100 kΩ), with active-high logic and ≥0.15-V hysteresis. When disabled, both outputs force low regardless of input state-ensuring safe MOSFET turn-off during fault or startup sequences.

Key Specifications

Pinout & Package

UCC27424P uses the 8-pin PDIP (Plastic Dual In-line Package) with 0.300-inch body width and through-hole mounting. Thermal resistance R_θJA = 55.5°C/W enables stable operation at up to 350 mW dissipation at T_A = 70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27424P, UCC27424D saves board area but sacrifices thermal headroom, while UCC27524APD delivers higher drive and broader supply range at the cost of increased layout sensitivity and BOM cost.

Availability

UCC27424P is available at Aetrix Electronics and suitable for switch mode power supplies, motor controllers, and Class D switching amplifiers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UCC27424P 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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.

The UCC2742x family was developed specifically for high-efficiency, high-frequency power conversion systems requiring robust, high-current gate drive with precise timing control and thermal resilience.

FAQ

What is the maximum gate capacitance UCC27424P can drive while maintaining 20-ns rise time?

The UCC27424P achieves 20-ns rise time with a 1.8-nF capacitive load per channel, as specified in the datasheet under standard test conditions (VDD = 14 V, C_LOAD = 1.8 nF). For larger loads, rise time increases linearly-e.g., 3.6 nF yields ~40 ns. To maintain timing integrity, external gate resistors may be added to limit di/dt and damp oscillation, but they will increase rise/fall times proportionally. The UCC27424P's ±4-A peak current ensures reliable drive into typical power MOSFETs with Q_g ≤ 80 nC at 12-V VDD.

Can UCC27424P drive P-channel MOSFETs in high-side configurations?

No, the UCC27424P is a dedicated low-side driver with outputs referenced to GND and designed for N-channel MOSFETs. Its non-inverting outputs swing from GND to VDD, making it unsuitable for direct high-side P-MOSFET drive, which requires a floating supply or level-shifted gate voltage above the source. For high-side drive, TI recommends the UCC27201 (dual high-side) or UCC27211 (dual high-/low-side) families. The UCC27424P must be used exclusively in low-side or half-bridge bottom-switch configurations.

How does the enable function behave when ENBA or ENBB is left unconnected?

When ENBA (pin 1) or ENBB (pin 8) is left open-circuit, the internal 100-kΩ pull-up resistor connects it to VDD, resulting in active-high logic and default enablement of that channel. Both outputs operate normally per their input signals. However, TI strongly advises against leaving enable pins floating in production designs due to susceptibility to noise-induced false disabling. If unused, tie ENBA/ENBB directly to VDD; if dynamic control is needed, add a 0.1-μF ceramic capacitor from each enable pin to GND to suppress transients.

What is the purpose of the BiPolar–MOSFET hybrid output stage in UCC27424P?

The hybrid output stage combines bipolar transistors (for high-current, low-voltage drive) and MOSFETs (for low R_DS(on) at higher voltages) in parallel. This architecture delivers peak ±4-A current precisely during the Miller plateau region (where V_GS ≈ 4–6 V), where conventional CMOS drivers exhibit reduced gain and slower transitions. As a result, the UCC27424P minimizes time spent in the MOSFET's linear region, cutting switching losses and improving efficiency in hard-switched topologies like buck converters and motor drives.

Does UCC27424P support paralleling of OUTA and OUTB for single 8-A output?

Yes, the UCC27424P explicitly supports paralleling OUTA and OUTB to deliver up to 8-A peak current to a single MOSFET gate, as confirmed in the datasheet Feature List and Section 7.3.3. To implement this, connect OUTA and OUTB together externally, drive both INA and INB with the same signal, and ensure ENBA and ENBB are both high. Layout must maintain equal trace length and impedance to both outputs to prevent current imbalance. No additional external components are required beyond proper decoupling and gate resistance.