Texas Instruments UCC27517ADBVT

Overview

UCC27517ADBVT 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 –5-V input voltage tolerance. It operates from 4.5 V to 18 V and supports both inverting (IN−) and non-inverting (IN+) configurations - used in GaN-based DC–DC converters and solar inverters for fast, robust switching control.

For engineers reviewing the UCC27517ADBVT datasheet, UCC27517ADBVT pinout, UCC27517ADBVT application, or UCC27517ADBVT equivalent, key selection considerations include its dual-input logic flexibility, UVLO-protected power-up behavior, rail-to-rail output swing, TTL/CMOS-compatible fixed-threshold inputs, and SOT-23-5 thermal performance under high-frequency switching loads.

Technical Context

The UCC27517ADBVT implements a dual-input architecture where either IN+ (non-inverting) or IN− (inverting) controls the OUT state, while the unused input serves as enable/disable - with internal pull-up (IN−) and pull-down (IN+) resistors ensuring low-output default during floating conditions. Its input thresholds are fixed at 2.2 V (high) and 1.2 V (low), independent of VDD, and feature 1-V hysteresis for noise immunity.

Internally, the device uses complementary MOSFET output stages delivering matched 4-A source/sink current, enabling fast 9-ns rise and 7-ns fall times into 1.8-nF loads. Undervoltage lockout activates below 3.7 V (rising) and releases above 4.2 V, with 0.3-V hysteresis, holding OUT low during power-up/down transients to prevent shoot-through in half-bridge topologies.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, surface-mount, thermally enhanced bottom-pad design optimized for PCB heat dissipation (R_θJB = 44°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27517ADBVT, UCC27511DBVT offers higher sink strength but sacrifices input robustness and dual-logic configurability, while LM5113SDX/NOPB trades off standalone low-side precision for integrated high-side functionality - making UCC27517ADBVT optimal for high-frequency, GaN-focused, low-side-only designs demanding noise immunity and layout simplicity.

Availability

UCC27517ADBVT is available at Aetrix Electronics and suitable for switch-mode power supplies, GaN-based DC–DC converters, and solar inverter gate-drive circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for UCC27517ADBVT 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 conversion solutions.

The UCC27517ADBVT belongs to TI's UCC2751x family of high-speed low-side gate drivers - designed specifically for emerging wide-bandgap power devices like GaN and SiC, emphasizing fast switching, input robustness, and thermal resilience in high-density power systems.

FAQ

What is the maximum allowable negative voltage on the IN+ and IN− pins of the UCC27517ADBVT?

The UCC27517ADBVT supports –5 V DC on both IN+ and IN− pins, as specified in the Absolute Maximum Ratings table. This capability allows the device to withstand negative transients common in high-dv/dt power stages without external clamping. The UCC27517ADBVT input structure does not rely on VDD-referenced clamps, so this rating holds regardless of VDD voltage - a key differentiator for GaN and fast-switching applications.

Does the UCC27517ADBVT require external pull-up or pull-down resistors on its input pins?

No - the UCC27517ADBVT integrates internal pull-down resistors on IN+ and pull-up resistors on IN−, ensuring the output remains low when either input floats. This eliminates the need for external biasing components in most configurations. However, when using one input for PWM and the other for enable/disable, the unused pin must still be actively biased (e.g., IN− tied to GND for non-inverting mode) to guarantee predictable operation - the UCC27517ADBVT relies on that intentional bias, not just the internal resistor, for functional enablement.

Can the UCC27517ADBVT drive a 1000-pF gate capacitance at 2 MHz without performance degradation?

Yes - the UCC27517ADBVT delivers 4-A peak current and achieves 9-ns rise / 7-ns fall times into 1.8-nF loads, indicating strong drive capability well beyond 1000-pF at 2 MHz. With Q_g ≈ 30 nC (typical for GaN FETs), average gate charge current is ~60 mA at 2 MHz, far below the UCC27517ADBVT's 4-A pulse rating. Thermal data (R_θJB = 44°C/W) confirms safe operation under these conditions when properly laid out - the UCC27517ADBVT is explicitly characterized for such high-frequency GaN use cases.

How does the UVLO function behave during power-down of the UCC27517ADBVT?

During power-down, the UCC27517ADBVT's UVLO circuit asserts when VDD falls below 3.9 V (typical falling threshold), forcing OUT low within nanoseconds - preventing partial turn-on of power switches as supply decays. This behavior is symmetric to power-up: the UCC27517ADBVT holds OUT low until VDD rises above 4.2 V (rising threshold), then resumes normal logic-controlled operation. The 0.3-V hysteresis prevents oscillation near the threshold, ensuring clean, deterministic state transitions - critical for system safety in the UCC27517ADBVT's target applications.

Is the UCC27517ADBVT pin-compatible with other members of the UCC2751x family?

No - the UCC27517ADBVT uses a 5-pin SOT-23 (DBV) package, while UCC27511DBVT and UCC27512DRS use 6-pin SOT-23 and 6-pin WSON packages respectively. Pin functions differ across variants: for example, UCC27511DBVT dedicates a separate EN pin, whereas the UCC27517ADBVT repurposes IN+ or IN− for enable functionality. Therefore, the UCC27517ADBVT is not pin-compatible with other UCC2751x parts - board redesign is required for substitution, though logic and performance profiles may overlap in system-level design.