Allegro MicroSystems A6263KLJTR-T

Overview

A6263KLJTR-T from Allegro MicroSystems is a linear, AEC-Q100-qualified LED current regulator IC delivering up to 100 mA per channel across four independent, matched current sources (LA1–LA4), with ±4% current accuracy, 5–10% inter-channel matching, and 6–50 V input voltage range. It drives high-brightness LED arrays in automotive interior/exterior lighting systems with integrated short-to-GND, open-string, and overtemperature protection.

For engineers reviewing the A6263KLJTR-T datasheet, A6263KLJTR-T pinout, A6263KLJTR-T application, or A6263KLJTR-T equivalent, this page delivers verified technical context, thermal derating behavior, fault-handling logic, SOICN-8LJ package layout guidance, and real-world selection criteria for automotive LED driver design.

Technical Context

The A6263KLJTR-T integrates four matched linear current regulators controlled by a single 1.2 V reference (IREF pin), where output current ILAx = 15 / RREF (RREF in kΩ, ILAx in mA). Each LAx output functions as a high-side current source with programmable thermal foldback via THTH pin voltage (adjustable TJM from 95°C to 130°C).

Fault management is fully autonomous: LAx short-to-GND disables only that channel while others remain active; open-string faults disable only the affected string; overtemperature triggers progressive current reduction (−2.5%/°C) before full shutdown at TJF = 170°C. The exposed thermal pad (PAD) requires ≥8 vias to GND for RθJP = 2°C/W and RθJA = 35°C/W on 4-layer PCBs.

Key Specifications

Pinout & Package

Package: 8-pin SOICN with exposed thermal pad (suffix LJ), RoHS-compliant, 100% matte tin leadframe plating. Dimensions: 4.90 × 3.90 × 1.73 mm (L×W×H), 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED current regulation applications.

Compared with A6263KLJTR-T, MAX16820ATP+T lacks autonomous per-channel fault recovery and thermal coordination, while TPS92692QPWPRQ1 trades simplicity for added dimming features and external thermal sensing - making A6263KLJTR-T optimal for cost-sensitive, thermally coupled automotive LED arrays needing plug-and-play reliability.

Availability

A6263KLJTR-T is available at Aetrix Electronics and suitable for automotive interior lighting, exterior lighting, and commercial vehicle lighting requiring stable component supply, AEC-Q100 compliance, and production-ready thermal management support.

Supply support for A6263KLJTR-T 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

Allegro MicroSystems is a U.S.-based semiconductor company specializing in high-performance magnetic sensing, power ICs, and precision motion control solutions for automotive and industrial markets.

The A6263KLJTR-T belongs to Allegro's protected LED driver product line, engineered specifically for automotive-grade constant-current LED array control with integrated fault resilience and thermal co-design capability.

FAQ

What is the maximum total LED current supported by the A6263KLJTR-T?

The A6263KLJTR-T supports up to 100 mA per channel across its four LAx outputs, yielding a maximum total regulated current of 400 mA. This assumes adequate thermal management - the actual achievable current depends on PCB layout, ambient temperature, and power dissipation limits defined by RθJA (35°C/W typical). At 125°C ambient and full load, thermal foldback will reduce output current to maintain safe junction temperature.

How do I set the LED current for all four channels of the A6263KLJTR-T?

You set the LED current for all four channels of the A6263KLJTR-T using a single external resistor (RREF) connected between the IREF pin and GND. The nominal output current per channel follows ILAx ≈ 15 / RREF, where ILAx is in mA and RREF is in kΩ. For example, a 125 Ω resistor yields ~120 mA, but the datasheet specifies 95–105 mA typical at 100 mA target - always verify with the Electrical Characteristics table and account for tolerance stack-up.

Does the A6263KLJTR-T provide protection against LED string short-to-ground faults?

Yes, the A6263KLJTR-T provides dedicated short-to-ground protection on each LAx output. When a short occurs between LAx and GND, the internal detector disables only that specific channel while allowing the remaining three channels to continue regulating current normally. This per-channel fault isolation is confirmed in the Functional Description and Fault Cases sections of the datasheet and is a core differentiator versus simpler multi-channel drivers.

Can the thermal foldback threshold of the A6263KLJTR-T be adjusted or disabled?

Yes, the thermal foldback activation temperature (TJM) of the A6263KLJTR-T is fully adjustable from 95°C to 130°C by applying a precise voltage (0.8–1.25 V) to the THTH pin using external resistors. To disable thermal foldback entirely while retaining overtemperature shutdown, short the THTH pin directly to GND - this is explicitly documented in the Terminal List Table and Functional Description sections.

What PCB layout practices are required for reliable thermal performance of the A6263KLJTR-T?

Reliable thermal performance of the A6263KLJTR-T requires connecting its exposed thermal pad (PAD) to the PCB ground plane using at least eight 0.3 mm vias placed directly under the pad. Copper thickness should be ≥2 oz, and bottom-layer copper area must be maximized. This achieves RθJA = 35°C/W (per JEDEC 4-layer test board); omitting vias or undersizing copper raises junction temperature and triggers premature thermal foldback or shutdown.