NXP Semiconductors UBA2081T/1,518

Overview

UBA2081T/1,518 from NXP Semiconductors is a latch-up free high-voltage monolithic half-bridge gate driver IC fabricated in Silicon-On-Insulator (SOI) technology. It drives external N-channel MOSFETs in half-bridge topologies with 400 mA sink / 200 mA source output capability, adjustable dead-time via external resistor, and low-active shutdown input-used in resonant LLC and CFL ballast circuits.

For engineers reviewing the UBA2081T/1,518 datasheet, UBA2081T/1,518 pinout, UBA2081T/1,518 application, or UBA2081T/1,518 equivalent, this page delivers verified functional identity, SO8 package mapping, confirmed 800 kHz max switching frequency, validated pin roles for CLK/SD/FS/GH/GL, and two rigorously cross-checked alternative drivers for half-bridge control.

Technical Context

The UBA2081T/1,518 operates in oscillation mode driven by a logic-level clock input (CLK), not complementary HIN/LIN signals. Its internal non-overlap logic uses an external resistor on SD to set dead-time between high-side and low-side gate outputs, with typical range 140 ns to 2.4 μs. The IC enters a defined start-up state at VDD ≥ 12 V, charging the bootstrap capacitor on FS before enabling gate drive.

Shutdown is activated when SD voltage drops below 2.2 V (VIH threshold), forcing both GH and GL low to turn off external MOSFETs. Propagation delays are tightly matched: tPD(HIN-GH) ≤ 180 ns and tPD(LIN-GL) ≤ 240 ns for UBA2080 variants-but UBA2081T/1,518 uses CLK-to-GH and SD-to-GL timing paths governed by its dedicated oscillator architecture.

Key Specifications

Pinout & Package

UBA2081T/1,518 is housed in an SO8 plastic small outline package (SOT96-1), 3.9 mm body width, 1.27 mm lead pitch, with gull-wing leads suitable for reflow soldering. Thermal resistance Rth(j-a) is 160 K/W in free air.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge driver applications.

Compared with IRS2011STRPBF and LM5109BMAX/NOPB, the UBA2081T/1,518 uniquely integrates analog dead-time adjustment via SD pin and a bootstrap diode-reducing BOM count and layout complexity in clock-synchronized resonant applications where variable dead-time is essential.

Availability

UBA2081T/1,518 is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, resonant LLC converters, induction heating systems, and DC motor half-bridge drivers requiring stable component supply and long-term industrial availability.

Supply support for UBA2081T/1,518 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The UBA2081T/1,518 belongs to NXP's high-voltage analog driver product line, designed specifically for energy-efficient lighting and resonant power conversion applications requiring latch-up immunity and integrated bootstrap functionality.

FAQ

What is the function of the SD pin on the UBA2081T/1,518?

The SD pin on the UBA2081T/1,518 serves a dual function: it accepts a low-active analog shutdown signal (<2.2 V) to immediately disable both GH and GL outputs, and it sets non-overlap time via an external resistor to GND. A 10–100 nF capacitor must be placed across the resistor to ensure noise immunity. This dual role is unique to the UBA2081T/1,518 and differs from the UBA2080's LIN input.

Does the UBA2081T/1,518 require an external bootstrap diode?

No, the UBA2081T/1,518 integrates a bootstrap diode with Vd(bs) = 2.3 V at 20 mA, eliminating the need for an external diode in standard CFL and LLC applications. This reduces component count and PCB area. The diode is connected internally between VDD and FS, and its forward voltage is specified in Table 8 of the datasheet.

What is the maximum voltage rating on the SH pin of the UBA2081T/1,518?

The SH pin of the UBA2081T/1,518 is rated for −3 V to +600 V under normal operation (t < 1 μs), making it suitable for high-voltage half-bridge configurations such as 380 V DC bus or 600 V IGBT/MOSFET bridges. This rating is defined in Table 6 (Limiting Values) and enables direct use in offline AC-DC and resonant converter topologies.

How does the UBA2081T/1,518 differ from the UBA2080T/1,518 in input interface?

The UBA2081T/1,518 uses a single-ended clock input (CLK) to drive both GH and GL outputs in phase with the clock edge, whereas the UBA2080T/1,518 requires complementary HIN and LIN inputs. This makes the UBA2081T/1,518 ideal for microcontroller-based or oscillator-driven systems, while the UBA2080T/1,518 suits traditional PWM controller interfaces.

What package type is used for the UBA2081T/1,518 and what are its key mechanical dimensions?

The UBA2081T/1,518 uses the SO8 plastic small outline package (SOT96-1) with 1.27 mm lead pitch, 3.9 mm body width, and gull-wing leads. Its thermal resistance is 160 K/W in free air. Package outline details-including Amax = 1.75 mm height, D = 4.9 mm length, and E = 3.9 mm width-are specified in Figure 9 of the datasheet.