Allegro MicroSystems A6264KLYTR-T

Overview

A6264KLYTR-T from Allegro MicroSystems is a linear, AEC-Q100-qualified LED current regulator IC designed for automotive stop/tail lighting systems. It delivers up to 100 mA per channel across four independent outputs, supports dual-current switching (high/low) via the FULL pin, achieves ±4% current accuracy and <10% inter-channel matching without ballast resistors, and operates from 6–50 V supply with thermal foldback protection.

For engineers reviewing the A6264KLYTR-T datasheet, A6264KLYTR-T pinout, A6264KLYTR-T application, or A6264KLYTR-T equivalent, key selection criteria include its 10-pin MSOP package with exposed thermal pad, programmable dual-level current setting via IREF/IREFH resistors, short-to-ground and open-load fault detection with FF flag output, and automotive-grade –40°C to 125°C ambient operation.

Technical Context

The A6264KLYTR-T implements four matched high-side linear current regulators with internal 1.2 V reference voltage at IREF and IREFH pins. Each LAx output sources current with gain GH = 12.5 × (IREF + IREFH when FULL = high), enabling precise dual-level LED drive (e.g., 20 mA tail / 90 mA stop) using external RREF/RREFH resistors.

It integrates short-to-ground detection (VSCD = 1.2–1.8 V), open-load detection (VOCD = 170–450 mV), thermal monitoring (TJM = 95–130°C activation, 2.5%/°C current reduction), and overtemperature shutdown (TJF = 170°C). Fault conditions are reported via open-drain FF pin, and outputs can be disabled individually by connecting LAx to VIN.

Key Specifications

Pinout & Package

Package: 10-pin MSOP (suffix LY), 3 mm × 3 mm body with exposed thermal pad (PAD) for enhanced thermal dissipation. Lead-free, 100% matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL8863-7DT-13 and TPS92692QPWPRQ1, the A6264KLYTR-T offers simpler implementation with no inductors or digital interface, tighter analog current matching (<10%), and integrated fault flag signaling - making it optimal for dedicated automotive stop/tail functions where reliability and BOM minimization are prioritized.

Availability

A6264KLYTR-T is available at Aetrix Electronics and suitable for automotive lighting, commercial vehicle rear lamps, and trailer lighting systems requiring stable component supply, AEC-Q100 compliance, and thermal resilience in harsh environments.

Supply support for A6264KLYTR-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 power ICs and magnetic sensors for automotive and industrial markets.

The A6264 product line is engineered specifically for automotive exterior lighting, delivering robust, matched-current LED drive with integrated diagnostics and thermal protection in compact MSOP/TSSOP packages.

FAQ

What is the maximum LED string voltage supported by the A6264KLYTR-T?

The A6264KLYTR-T does not specify a maximum LED string voltage directly, but its minimum dropout voltage is 660 mV at 40 mA and 800 mV at 100 mA. With a 50 V absolute maximum VIN rating, the practical maximum forward voltage per string is VIN – VDO. For example, at VIN = 16 V and ILAx = 100 mA, VLED ≤ 15.2 V. Designers must ensure VLED remains below VIN minus the applicable VDO across operating temperature and current.

How do I configure the A6264KLYTR-T for 25 mA tail light and 85 mA stop light currents?

Using the equations ILAx(LO) = RREF/15 and ILAx(HI) – ILAx(LO) = RREFH/15 (with R in kΩ), set RREF = 15 × 25 = 375 kΩ and RREFH = 15 × (85 – 25) = 900 kΩ. Connect RREF from IREF to GND and RREFH from IREFH to GND. The A6264KLYTR-T will then deliver 25 mA when FULL = low and 85 mA when FULL = high, with ±4% accuracy and <10% matching across all four LAx outputs.

Does the A6264KLYTR-T require external capacitors for stability?

Yes - a 100 nF ceramic bypass capacitor must be placed close between VIN and GND to ensure stable operation of the internal regulators and reference circuits. No additional compensation capacitors are required on LAx outputs, as the A6264KLYTR-T is internally compensated for typical LED loads. Layout best practice mandates short, low-inductance traces to the exposed thermal pad and GND plane.

Can the A6264KLYTR-T drive more than one LED per string?

Yes - the A6264KLYTR-T is optimized for driving 1 to 3 LEDs in series per string, with total string forward voltage up to ~15 V at 12 V supply. Its 6–50 V input range and low dropout enable reliable operation across automotive battery voltages. Driving more than 3 LEDs risks exceeding the available headroom (VIN – VLED), especially at low VIN or high temperature where VDO increases and thermal foldback may reduce current.

What happens when an open-load fault occurs on one LAx output of the A6264KLYTR-T?

When an open load is detected on any LAx output (VIN – VLAx > VOCD for >2 ms), the A6264KLYTR-T disables all four LAx outputs and pulls the FF pin high (open-drain, so external pull-up required). To restore operation of remaining healthy outputs, the host system must pull FF low - this overrides the open-load lockout and re-enables all non-disabled channels. Outputs can also be individually disabled by connecting LAx directly to VIN.