Allegro MicroSystems A8519KETTR-R-1

Overview

A8519KETTR-R-1 from Allegro MicroSystems is an automotive-grade, multi-output LED driver IC for LCD backlighting in infotainment and instrument clusters. It integrates a current-mode boost converter (4.5–40 V input, 40 V max output) with four 100 mA LED current sinks, supports PWM + analog dimming for 100,000:1 contrast ratio, and features AEC-Q100 qualification, load-dump tolerance, and fault protection including OVP, overtemperature, and LED string diagnostics.

For engineers reviewing the A8519KETTR-R-1 datasheet, A8519KETTR-R-1 pinout, A8519KETTR-R-1 application, or A8519KETTR-R-1 equivalent, this page delivers verified technical context, exact pin functions, real-world automotive use cases, confirmed alternatives with functional differences, and supply-chain support details for production design-in.

Technical Context

The A8519KETTR-R-1 implements hysteresis-based LED current regulation with a 150 mV window (A8519-1 variant), enabling stable dimming at ultra-low PWM duty cycles. Its boost converter uses an internal 42 V MOSFET switch (100–500 mΩ R_DS(on)) and supports programmable switching frequency from 200 kHz to 2.15 MHz - dithered to reduce EMI - or synchronization from 320 kHz to 2.3 MHz via FSET pin.

It provides four independent LED current sinks with 0.7% accuracy per channel and 0.8% matching between strings, each regulated to 750–975 mV compliance voltage. Fault handling includes cycle-by-cycle current limiting, open/short LED detection, VOUT-to-GND short protection via external P-MOSFET gate drive (GATE pin), and thermal shutdown at 155–170°C with 20°C hysteresis.

Key Specifications

Pinout & Package

28-pin 5 × 5 mm QFN with exposed thermal pad (suffix ET); requires ≥8 vias to PCB ground plane for thermal reliability in high-power backlight applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3409QMYX/NOPB and TPS61165DRVR, the A8519KETTR-R-1 delivers integrated quad-string control, AEC-Q100 assurance, and advanced diagnostics - eliminating external components and validation effort required for automotive cluster and infotainment systems.

Availability

A8519KETTR-R-1 is available at Aetrix Electronics and suitable for automotive infotainment backlighting, instrument cluster illumination, and center stack display applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for A8519KETTR-R-1 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 designer of high-performance magnetic sensing and power ICs, specializing in automotive-grade motion control and energy-efficient power management solutions.

The A8519 product line was developed specifically for fault-tolerant, high-contrast LED backlighting in automotive human-machine interfaces, addressing stringent requirements for thermal robustness, EMI resilience, and diagnostic coverage.

FAQ

What is the key difference between A8519KETTR-R-1 and A8519KETTR-R?

The A8519KETTR-R-1 uses a 150 mV hysteresis window for improved output voltage stability during low-duty PWM dimming, whereas the A8519KETTR-R uses a 350 mV window. This results in lower output ripple and better dimming linearity at ultra-low brightness levels - a critical distinction for high-end automotive displays requiring smooth grayscale transitions. Both share identical pinout, package, and core functionality.

Does A8519KETTR-R-1 support synchronization with external clock sources?

Yes, the A8519KETTR-R-1 supports external synchronization via the FSET pin. When driven with a logic-level clock signal between 320 kHz and 2.3 MHz, it locks its internal oscillator to that frequency - disabling dithering but enabling deterministic EMI reduction across multi-converter systems. The FSET pin also accepts a resistor to GND for standalone frequency programming (200 kHz–2.15 MHz).

How does A8519KETTR-R-1 handle LED string faults during startup?

The A8519KETTR-R-1 performs automatic LED pin diagnostics before soft-start. It applies a test voltage and measures VLEDx: <70 mV indicates a short-to-ground (halts startup), 150 mV indicates unused pin (disabled via 3.09 kΩ pull-down), and >325 mV confirms active string. This prevents uncontrolled current flow and ensures only valid LED configurations proceed to regulation - a safety-critical feature for automotive deployment.

Can A8519KETTR-R-1 drive more than 100 mA per LED string?

No - the A8519KETTR-R-1 is specified for 100 mA per string maximum. However, its four current sinks can be paralleled externally (e.g., LED1+LED2 tied together) to achieve up to 400 mA total sink current, provided thermal design accommodates the increased power dissipation. Parallel operation requires matched layout and shared ISET reference to maintain current accuracy and matching.

What protection features are integrated into A8519KETTR-R-1?

The A8519KETTR-R-1 integrates comprehensive protection: output overvoltage (OVP at 8.3 V typical, secondary at 45 V), input overcurrent (cycle-by-cycle limit at 3.65 A), overtemperature shutdown (155–170°C), LED open/short detection, boost diode open detection, and VOUT-to-GND short response via GATE-driven P-MOSFET disconnect. All faults assert the open-drain FAULT pin for system-level monitoring.