Texas Instruments UCC3776N

Overview

UCC3776N from Texas Instruments is a quad high-speed, high-current BCDMOS gate driver IC designed for low-side power MOSFET switching in DC-DC converters, motor drives, and half/full-bridge topologies. It delivers ±1.5A/±2.0A peak source/sink current per output, operates from 4.5V to 18V, features thermal shutdown with hysteresis, undervoltage lockout (UVLO) at 4.5V (0.5V hysteresis), and CMOS-compatible inputs. Its active-low outputs during UVLO prevent unintended MOSFET turn-on under brownout conditions.

For engineers reviewing the UCC3776N datasheet, UCC3776N pinout, UCC3776N application, or UCC3776N equivalent, key selection considerations include its 16-pin PDIP package, polarity-selectable inverting/non-inverting operation via POL pin, ENBL-controlled output enable/disable, and dual VDD supply architecture (VDD1 for OUT1/OUT4, VDD2 for OUT2/OUT3) optimized for high dV/dt immunity and gate charge delivery.

Technical Context

The UCC3776N integrates four independent totem-pole DMOS output stages with CMOS input logic, enabling configurable inverting or non-inverting behavior across all channels via a shared POL pin. Each output is rated for 1.5A source / 2.0A sink peak current at 12V supply, with 25ns rise time and 10ns fall time into 1nF load.

It implements dual independent UVLO circuits (one per VDD rail) and thermal shutdown with hysteresis to ensure safe operation during overtemperature or supply collapse. The ENBL input forces all outputs low when inactive, and the device maintains output-off state even with zero VDD due to internal discharge paths-critical for preventing Miller-induced shoot-through in high-speed power stages.

Key Specifications

Pinout & Package

UCC3776N is housed in a 16-pin plastic dual in-line package (PDIP-N), with 4 ground pads (GND) for low-inductance return paths and dual VDD supplies (VDD1/VDD2) to minimize cross-channel coupling under high di/dt.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad gate driver applications.

Compared with UCC3776N, UCC2776DP offers extended temperature range but requires SMT assembly and is obsolete; IXDN404PI provides higher peak current but shifts UVLO and thermal protection responsibility to the system designer - making UCC3776N preferable for cost-sensitive, safety-aware commercial power designs.

Availability

UCC3776N is available at Aetrix Electronics and suitable for DC-DC converter design, motor control prototyping, and industrial PLC output modules requiring stable component supply and legacy through-hole compatibility.

Supply support for UCC3776N 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 control ICs.

The UCC3776N belongs to TI's legacy BCDMOS gate driver family, engineered specifically for robust, high-speed MOSFET/IGBT switching in commercial-grade power conversion systems where simplicity, protection integration, and through-hole manufacturability are prioritized.

FAQ

What is the maximum operating temperature for the UCC3776N?

The UCC3776N is specified for 0°C to +70°C ambient operating temperature. Its internal thermal shutdown activates at junction temperatures exceeding ~150°C with hysteresis, allowing safe recovery before resuming operation. This rating aligns with commercial-grade power supply and motor drive applications where enclosure airflow and heatsinking are controlled. For extended temperature requirements, the UCC2776 variant (−40°C to +85°C) may be considered, though it uses SOIC packaging.

Does the UCC3776N support both inverting and non-inverting configurations?

Yes, the UCC3776N supports both configurations via the POL pin: logic low selects inverting mode (output follows inverse of input), logic high selects non-inverting mode (output mirrors input). This setting applies globally to all four drivers simultaneously. The input thresholds (VIH = 3V, VIL = 2V) are CMOS-compatible and independent of VDD voltage, ensuring reliable polarity selection across the full 4.5V–18V supply range.

How does the UCC3776N behave during undervoltage lockout (UVLO)?

During UVLO - triggered when either VDD1 or VDD2 falls below 4.5V - the UCC3776N forces all outputs (OUT1–OUT4) actively low, regardless of ENBL or input states. This behavior persists even with zero supply voltage applied, thanks to internal discharge paths. It prevents unintended MOSFET turn-on caused by capacitive coupling (e.g., Miller current) during brownout or startup, a critical safety feature in high-dV/dt power stages.

Can multiple UCC3776N outputs be paralleled for higher current drive?

Yes, UCC3776N outputs can be paralleled - for example, pairing OUT1+OUT2 to drive a single high-gate-charge MOSFET - to effectively double peak current capability. TI's application notes recommend using separate gate resistors per output to balance current sharing and suppress ringing. This technique is validated in Figure 2 of the UCC3776N datasheet and maintains timing integrity better than external current-combining circuits.

Is the UCC3776N pin-compatible with other members of the UCCx776 family?

Yes, the UCC3776N shares identical pinout and electrical functionality with UCC1776 and UCC2776 in the same 16-pin PDIP or SOIC package. Differences lie solely in temperature grade (UCC1776: −55°C to +125°C; UCC2776: −40°C to +85°C; UCC3776N: 0°C to +70°C) and packaging status - not pin assignment or signal behavior. This allows direct substitution in existing layouts when thermal requirements permit.