NXP Semiconductors UBA2037T/N1,118

Overview

UBA2037T/N1,118 from NXP Semiconductors is a high-voltage monolithic full-bridge control IC fabricated in HVSOI technology, designed to drive power MOSFETs in HID lamp ballasts. It integrates bootstrap diodes, 464 V level-shifting capability, 550 V bridge voltage rating, adjustable oscillator (up to 200 kHz), and adaptive non-overlap timing. It is deployed in projector and general lighting HID drivers requiring precise 50 % duty-cycle gate drive.

For engineers reviewing the UBA2037T/N1,118 datasheet, UBA2037T/N1,118 pinout, UBA2037T/N1,118 application, or UBA2037T/N1,118 equivalent, this page delivers verified functional identity, SO24 package mapping, confirmed 24-pin terminal roles, real-world HID lighting use context, and validated alternative options for ballast design continuity.

Technical Context

The UBA2037T/N1,118 implements an internal oscillator with RC-tunable frequency (0–200 kHz) and optional ÷2 divider to enforce 50 % duty cycle. Its adaptive non-overlap circuit senses half-bridge voltage slew rate (5–25 V/µs) to dynamically set dead time (600–1300 ns), optimizing switching efficiency across operating frequencies.

It features dual-level supply architecture: HV pin accepts up to 550 V to power an internal series regulator (550 V input), generating VDD (12 V typical); logic clock circuitry operates independently with 464 V-rated VSS(CLK)/VDD(CLK) pins. Bridge disable (VBD = 1.29 V) and start-up delay (SU input) provide system-level control over ignition sequencing.

Key Specifications

Pinout & Package

UBA2037T/N1,118 is housed in a plastic small outline package (SO24, SOT137-1) with 24 leads and 7.5 mm body width. Pin functions are validated per NXP datasheet Rev. 01 (2008), Figure 2 and Table 2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar full-bridge control IC applications.

Compared with UBA2037T/N1,118, UBA2037TS/N1,118 offers identical functionality in a denser package but mandates board redesign, while IRS21844SPBF trades integrated HID-optimized features for greater flexibility in custom-controlled topologies - making UBA2037T/N1,118 the optimal choice for cost-sensitive, self-contained HID ballast modules.

Availability

UBA2037T/N1,118 is available at Aetrix Electronics and suitable for projector HID ballasts, street lighting systems, and commercial indoor lighting requiring stable component supply, long-lifecycle support, and automotive-grade reliability under thermal stress.

Supply support for UBA2037T/N1,118 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 applications.

The UBA2037T/N1,118 belongs to NXP's HID lighting control IC product line, engineered specifically for high-efficiency, high-reliability electronic ballasts powering metal halide and high-pressure sodium lamps in professional and infrastructure lighting.

FAQ

What is the maximum bridge switching frequency supported by the UBA2037T/N1,118?

The UBA2037T/N1,118 supports a maximum bridge frequency of 200 kHz when using the internal oscillator with RC network on the RC pin. This limit is specified in Table 6 of the NXP datasheet under "fbridge" parameter. Frequencies above 200 kHz are not guaranteed and may compromise adaptive non-overlap timing or gate drive strength. The UBA2037T/N1,118 achieves this via its HVSOI process and optimized driver stages.

Does the UBA2037T/N1,118 require an external power supply for its logic section?

No, the UBA2037T/N1,118 does not require a separate low-voltage supply. It generates its internal VDD (12 V typical) from the HV pin input (up to 550 V) using an integrated series regulator. A decoupling capacitor on VDD is mandatory for ripple suppression. Alternatively, VDD can be powered directly with 12 V, in which case HV must be tied to VDD or SGND - as defined in Section 7.1 of the UBA2037T/N1,118 datasheet.

How does the adaptive non-overlap function work in the UBA2037T/N1,118?

The UBA2037T/N1,118 implements adaptive non-overlap by internally sensing the falling edge slew rate (dV/dt) of the half-bridge voltage - which correlates with MOSFET turn-off dynamics. Based on this measurement, it dynamically adjusts dead time between complementary gate signals to maintain safe commutation margins. The resulting non-overlap time ranges from 600 ns to 1300 ns depending on operating conditions, as specified in Table 6 under "tno".

Can the UBA2037T/N1,118 drive MOSFETs without external bootstrap components?

No - the UBA2037T/N1,118 requires external bootstrap capacitors connected between FSL–SHL and FSR–SHR to power the high-side gate drivers. While it integrates bootstrap diodes (reducing component count), the capacitors themselves are mandatory for sustaining high-side gate voltage during continuous conduction. The datasheet specifies typical values (e.g., 100 nF) and layout guidelines in Section 7.5 and Figure 1.

What is the purpose of the SU (start-up delay) pin on the UBA2037T/N1,118?

The SU pin on the UBA2037T/N1,118 enables controlled start-up sequencing by delaying gate drive enablement until the HID lamp bus voltage reaches a safe ignition threshold. A simple RC filter (R from VDD to SU, C from SU to SGND) or active MCU signal can be applied. This prevents premature lamp striking before sufficient open-circuit voltage is established - a key requirement for reliable HID lamp life, as documented in Section 7.5 of the UBA2037T/N1,118 datasheet.