Texas Instruments UCC27517DBVT

Overview

UCC27517DBVT from Texas Instruments is a single-channel, high-speed, low-side MOSFET/IGBT gate driver IC with symmetrical 4-A peak source/sink drive capability, 13-ns typical propagation delay, and 4.5 V to 18 V supply range - deployed in GaN-based DC-DC converters and solar inverters for precise, glitch-free switching control.

For engineers reviewing the UCC27517DBVT datasheet, UCC27517DBVT pinout, UCC27517DBVT application, or UCC27517DBVT equivalent, key selection criteria include its dual-input (IN+/IN−) configurability, UVLO-enabled power-up safety, TTL/CMOS-compatible input thresholds independent of VDD, and SOT-23-5 thermal performance at 140°C junction temperature.

Technical Context

The UCC27517DBVT implements a rail-to-rail output stage with matched P/N-channel MOSFETs enabling symmetrical 4-A source/sink current into capacitive loads, minimizing shoot-through by design. Its dual-input architecture allows either IN+ (noninverting) or IN− (inverting) to serve as active control input while the other functions as enable/disable - all supported by internal pullup/pulldown resistors.

Undervoltage lockout (UVLO) triggers at 4.2 V (typ) with 300-mV hysteresis, holding OUT low during power-up/down transients. Input thresholds are fixed at 2.2 V (high) and 1.2 V (low), independent of VDD, ensuring compatibility with 3.3-V and 5-V controllers across –40°C to 140°C operation.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, single-row 5-pin surface-mount with exposed pad not present - optimized for compact, thermally constrained PCB layouts in high-density power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27517DBVT, UCC27511DBV offers superior turn-off strength for Miller-dominated switching but adds a pin and reduces supply flexibility; LM5113SDX provides dual-channel integration at the cost of higher complexity and narrower VDD range - neither matches UCC27517DBVT's combination of 5-pin simplicity, symmetrical 4-A drive, and 4.5–18 V operation.

Availability

UCC27517DBVT is available at Aetrix Electronics and suitable for GaN-based DC-DC converters, solar microinverters, and industrial motor drives requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.

Supply support for UCC27517DBVT 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 over 90 years of innovation in high-reliability industrial and automotive components.

The UCC27517DBVT belongs to TI's UCC2751x low-side gate driver family, engineered specifically for high-frequency, high-efficiency power conversion systems using wide-bandgap semiconductors - emphasizing robustness, timing precision, and ease of integration in space-constrained designs.

FAQ

What is the maximum allowable VDD voltage for UCC27517DBVT?

The absolute maximum VDD rating for UCC27517DBVT is 20 V, but the recommended operating range is 4.5 V to 18 V per the datasheet. Operation above 18 V risks exceeding safe junction temperature limits and may degrade long-term reliability. The device's UVLO circuit ensures output remains low if VDD falls below 3.9 V (typical falling threshold), protecting downstream power switches during brownout conditions. Always use proper decoupling (0.1 µF + 1 µF) on VDD for stable operation.

Can UCC27517DBVT drive both MOSFETs and IGBTs?

Yes, UCC27517DBVT is explicitly designed to drive both N-channel MOSFETs and IGBTs as a low-side gate driver. Its 4-A symmetrical peak source/sink current, rail-to-rail output swing, and fast 9-ns/7-ns rise/fall times provide sufficient gate charge delivery for devices with Qg up to ~50 nC at 1 MHz. The 140°C maximum junction temperature and robust input hysteresis further ensure reliable operation in high-power IGBT-based motor drives and UPS systems where thermal stress and electrical noise are significant.

How does the dual-input configuration work on UCC27517DBVT?

UCC27517DBVT features two independent logic inputs: IN+ (noninverting) and IN− (inverting). In standard use, one input serves as the active PWM signal while the other is biased to enable the driver - e.g., tie IN− to GND for noninverting operation, or tie IN+ to VDD for inverting operation. The unused pin can also function as a hardware enable/disable signal. Internal pullup/pulldown resistors guarantee OUT remains low if either input floats, satisfying safety standards without external components.

Is UCC27517DBVT compatible with 3.3-V microcontrollers?

Yes, UCC27517DBVT is fully compatible with 3.3-V microcontrollers. Its TTL/CMOS-compatible input thresholds (2.2 V high, 1.2 V low) are fixed and independent of VDD, so a 3.3-V logic high cleanly exceeds the 2.2-V minimum and a 3.3-V logic low stays well below the 1.2-V maximum. The 1.0-V input hysteresis further ensures noise rejection in mixed-signal environments. No level-shifting circuitry is required when interfacing with 3.3-V digital controllers.

What thermal considerations apply to UCC27517DBVT in SOT-23-5 package?

UCC27517DBVT in the SOT-23-5 (DBV) package has a junction-to-ambient thermal resistance (R_θJA) of 217.6°C/W, meaning it requires careful PCB layout for thermal management. TI recommends a minimum 100 mm² copper pour connected to the GND pin (Pin 2) on the bottom layer, with ≥4 thermal vias (0.3-mm diameter) under the package. At 4-A peak current and 1 MHz switching, junction temperature rise can exceed 60°C above ambient - verify thermal margin using R_θJB = 44.0°C/W and actual board stack-up in your design.