Allegro MicroSystems A6264KLPTR-T

Overview

A6264KLPTR-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 <5% current matching between strings, and operates from 6–50 V supply with thermal foldback protection.

For engineers reviewing the A6264KLPTR-T datasheet, A6264KLPTR-T pinout, A6264KLPTR-T application, or A6264KLPTR-T equivalent, key selection considerations include its 16-pin TSSOP-LP package with exposed thermal pad, programmable dual-level LED current using IREF/IREFH resistors, short-to-ground and open-load fault detection with FF flag output, and operation across –40°C to 125°C ambient.

Technical Context

The A6264KLPTR-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 control for brake/tail differentiation.

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), and overtemperature shutdown (TJF = 170°C). Fault status is reported via open-drain FF pin, and thermal foldback reduces current at >TJM by –2.5%/°C typical until 25% residual current at TJL = 120–150°C.

Key Specifications

Pinout & Package

Package: 16-pin TSSOP (LP suffix), 4.4 mm × 5 mm body with exposed thermal pad (PAD) for enhanced heat transfer. RoHS-compliant, 100% matte tin leadframe plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ASL3416SHN and TLC59284PWPR, the A6264KLPTR-T uniquely combines AEC-Q100 qualification, hardware-based dual-level current control, integrated fault reporting, and autonomous thermal foldback - making it purpose-built for automotive stop/tail LED array regulation without external supervision.

Availability

A6264KLPTR-T is available at Aetrix Electronics and suitable for automotive rear lighting systems, commercial vehicle signal modules, and motorcycle LED assemblies requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for A6264KLPTR-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 magnetic sensing, power ICs, and precision motion control solutions for automotive and industrial markets.

The A6264 product line is engineered specifically for automotive LED lighting applications, delivering robust, thermally aware current regulation for stop/tail lamp systems operating in harsh environmental conditions.

FAQ

What is the maximum number of LEDs supported per string by the A6264KLPTR-T?

The A6264KLPTR-T is optimized for driving 1 to 3 LEDs per string. With a minimum dropout voltage of 660 mV at –40 mA and 800 mV at –100 mA, it supports common red (1.8–2.2 V), amber (2.0–2.3 V), and white (3.0–3.4 V) LEDs. For example, three red LEDs (6.9 V total VF) operate reliably at 12 V supply with 5.1 V headroom - well within the device's 6–50 V VIN range. Driving more than 3 LEDs risks insufficient headroom below minimum supply limits.

How does the A6264KLPTR-T handle an open LED fault in one string?

When an open LED occurs in any string, the A6264KLPTR-T detects it via VOCD (170–450 mV) and disables all four LAx outputs after tOCD = 2 ms delay, asserting the FF flag high. However, pulling FF low overrides this behavior and re-enables all active outputs - a critical feature for fail-operational lighting. The A6264KLPTR-T does not auto-recover; manual intervention or system-level reset is required unless FF is actively held low during fault conditions.

Can the A6264KLPTR-T be used with a 24 V commercial vehicle supply?

Yes, the A6264KLPTR-T supports 6–50 V supply, making it fully compatible with 24 V commercial vehicle systems. Its thermal design - with RθJA = 34 °C/W on 4-layer PCB - allows safe operation at full 100 mA per channel even at 24 V, provided board-level thermal vias and copper area meet Allegro's LP-package layout guidelines. Power dissipation increases linearly with VIN, so thermal validation is essential at higher voltages.

What resistor values set 85 mA (stop) and 25 mA (tail) per channel on the A6264KLPTR-T?

Using the equations ILAx(LO) = RREF/15 and ILAx(HI) – ILAx(LO) = RREFH/15 (with currents in mA and resistors in kΩ): RREF = 25 × 15 = 375 kΩ; RREFH = (85 – 25) × 15 = 900 kΩ. Standard 1% E96 values - 374 kΩ and 898 kΩ - yield 24.93 mA and 84.93 mA respectively, meeting ±4% accuracy. Both resistors connect from IREF/IREFH pins to GND; IREF and IREFH pins maintain 1.2 V reference regardless of resistor value.

Does the A6264KLPTR-T require external components beyond IREF/IREFH resistors?

Yes - the A6264KLPTR-T requires a 100 nF ceramic bypass capacitor between VIN and GND, placed adjacent to the IC. An external pull-up resistor (typically 10 kΩ) on the FF pin is mandatory for fault reporting. The FULL pin may need a series resistor if driven directly from a microcontroller GPIO to limit current. No external MOSFETs, ballast resistors, or sense resistors are needed - all current regulation and protection are integrated into the A6264KLPTR-T.