A81415 - ASIL-D Automotive PMIC with Wheel-Speed Interface | Allegro

Electromechanical Braking (EMB) Corner Modules

The A81415 is purpose-built for electromechanical braking corner modules, where a wheel-end actuator requires ASIL-D power and wheel-speed feedback in a constrained space. Its buck-boost pre-regulator maintains stable intermediate rail generation across the automotive 12 V battery profile, including cold crank and load-dump transients, while five integrated LDOs independently supply the braking microcontroller, gate-drive circuitry, and sensing electronics. Because the wheel-speed sensor interface decodes any protocol on chip, the corner module eliminates a dedicated decoder IC, saving an estimated $4 per vehicle and roughly 50% board area per Allegro's July 2026 launch data. The AEC-Q100 Grade 0 qualification supports the elevated ambient temperatures typical of brake-actuator locations near friction surfaces.

Brake-by-Wire Systems in Software-Defined Vehicles

In brake-by-wire architectures for software-defined vehicles, mechanical linkage between pedal and calipers is removed, making electronic power and sensing reliability safety-critical. The A81415 consolidates the corner-module power tree and wheel-speed decoding into one ASIL-D-capable device, simplifying the safety case because power-rail diagnostics and sensor-signal integrity features are documented within a single safety concept. Its multi-protocol wheel-speed interface allows the vehicle maker to standardize one corner-module PCB across platforms using passive, active, or current-modulated wheel-speed sensors. The single-chip integration shortens development cycles and reduces qualification effort, which is valuable in software-defined vehicle programs where corner modules iterate rapidly across multiple vehicle lines and regional platform derivatives.

Wheel-End Power Supplies for Braking ECUs

Wheel-end braking ECUs operate in one of the harshest thermal environments on the vehicle, directly exposed to brake heat soak and road-splash conditions. The A81415 addresses this with AEC-Q100 Grade 0 qualification and a buck-boost pre-regulator topology that keeps downstream LDO outputs in regulation even as battery voltage collapses during cold crank or surges during load dump. The five LDOs can be allocated across the ECU's logic, analog front end, and actuator driver supplies, with integrated sequencing and monitoring supporting the ASIL-D safety concept. Designers should verify per-rail current limits and thermal dissipation against the official datasheet electrical tables, since published distributor data does not yet enumerate the individual rail specifications for this newly released device.

ASIL-D Functional Safety Power Architecture

For any chassis-domain application requiring ASIL-D power management, the A81415 provides an integrated safety concept covering its buck-boost pre-regulator, five LDOs, and the wheel-speed interface channel. Integrating diagnostics within one device reduces the system-level fault analysis burden: the safety manual and failure-mode documentation cover a single die rather than a multi-chip power tree, easing ISO 26262-style analyses for OEMs and Tier 1 suppliers. The device's safety features include rail monitoring and protective functions per the manufacturer description, supporting both power-supply integrity and sensor-signal plausibility checks. Engineering teams should review Allegro's safety documentation package alongside the datasheet when building the item definition and safety analysis for a brake-by-wire ECU program.

Multi-Protocol Wheel-Speed Signal Conditioning

The A81415's one-channel wheel-speed sensor interface decodes sensors of any protocol, per Allegro's product description, allowing one corner-module design to serve passive variable-reluctance sensors, two-wire current-interface active sensors, and other wheel-speed signaling conventions without hardware changes. This eliminates an external decoder or discrete conditioning network, removing associated components from the functional-safety analysis and freeing board space in the compact wheel-end envelope. Because the interface is powered and monitored within the same ASIL-D safety concept as the supply rails, signal-plausibility diagnostics can be coordinated with power-supply diagnostics at the device level. System architects benefit from platform flexibility: a single validated A81415-based module supports multiple sensor suppliers and regional sensor conventions across vehicle programs.

Electric Vehicle Chassis and Corner Electronics

Electric-vehicle chassis domains consolidate braking, steering, and suspension electronics, increasing demand for compact, safety-rated power solutions at each corner. The A81415's integration profile matches these requirements: a single ASIL-D device supplies regulated power via its buck-boost pre-regulator and five LDOs while providing wheel-speed decoding, with AEC-Q100 Grade 0 qualification for severe underbody ambient temperatures. Allegro estimates approximately $4 per-vehicle BOM savings and about 50% additional board space compared with discrete PMIC-plus-decoder implementations, which directly translates into smaller, lighter corner modules - an important consideration for EV range. The multi-protocol sensor interface also future-proofs designs as wheel-speed sensor technologies evolve across vehicle generations and sensor supplier selections change over a platform's lifetime.