Allegro MicroSystems A80602KESJSR

Overview

A80602KESJSR from Allegro MicroSystems is a 6-channel automotive LED driver IC implementing a current-mode boost/SEPIC converter with external N-MOSFET gate driver, delivering up to 140 mA per channel (840 mA total), operating from 4.5–40 V input, and achieving 15,000:1 PWM dimming contrast ratio at 200 Hz for exterior lighting and HUD applications.

For engineers reviewing the A80602KESJSR datasheet, A80602KESJSR pinout, A80602KESJSR application, or A80602KESJSR equivalent, key selection considerations include its AEC-Q100 qualification, Pre-Emptive Boost control enabling ultra-low PWM on-time (0.3 µs), six integrated current sinks with ±0.7% accuracy, 260 kHz–2.3 MHz programmable switching frequency, and wettable-flank 24-pin QFN package optimized for thermal performance in automotive environments.

Technical Context

The A80602KESJSR integrates a precision current-mode boost/SEPIC controller with cycle-by-cycle current limiting, Pre-Emptive Boost (PEB) algorithm to minimize output ripple and avoid MLCC audible noise, and dual dimming control via EN/PWM (200 Hz–2 kHz) and ADIM (40–1000 kHz APWM or 0.2–2 V analog).

It features an internal 4.25 V LDO (VDD), 6.5 V gate driver supply (VDRV), fault detection for open/shorted LED strings, overvoltage protection (OVP), input overcurrent sensing via VSENSE, and thermal shutdown at 170°C with 20°C hysteresis - all designed for ASIL B-compliant automotive systems requiring robustness under cold crank (down to 4 V post-start) and load dump conditions.

Key Specifications

Pinout & Package

Package: 24-pin 4 mm × 4 mm QFN with wettable flank, exposed thermal pad, and sidewall plating - optimized for automated optical inspection (AOI) and high-power thermal dissipation in automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL8862T-7 and LM3409QMYX/NOPB, the A80602KESJSR delivers higher integration (6 sinks + PEB + OVP + VSENSE OCP), superior dimming performance (0.3 µs PWM on-time vs. >1 µs), and full AEC-Q100/ASIL B compliance - making it optimal for safety-critical, high-contrast automotive lighting where reliability and precision outweigh cost sensitivity.

Availability

A80602KESJSR is available at Aetrix Electronics and suitable for automotive exterior lighting, heads-up display backlighting, and infotainment LCD backlighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified performance.

Supply support for A80602KESJSR 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, magnetic sensors, and motor driver solutions for automotive and industrial markets.

The A80602KESJSR belongs to Allegro's high-power LED driver product line, engineered specifically for ASIL B-compliant automotive lighting systems demanding ultra-high dimming ratios, robust fault handling, and operation across harsh vehicle electrical environments.

FAQ

What is the minimum input voltage required for A80602KESJSR startup?

The A80602KESJSR requires a minimum input voltage of 4.5 V to initiate startup due to its VIN UVLO rising threshold of 4.45 V. However, once operational, it sustains regulation down to 4.0 V - a critical feature for automotive stop/start systems and cold-crank scenarios where battery voltage dips transiently. This behavior is confirmed in the Electrical Characteristics table under VIN UVLO Start/Stop Thresholds.

Does A80602KESJSR support both boost and SEPIC topologies?

Yes, the A80602KESJSR supports both boost and SEPIC configurations via its current-mode controller architecture and external MOSFET gate driver (GDRV). The datasheet explicitly states "Operate in Boost or SEPIC mode for flexible output" and provides design guidance for both topologies in Appendix C. Selection depends on whether output voltage must exceed input (boost) or handle input voltages both above and below output (SEPIC).

How does the One-Out-Continue fault handling work in A80602KESJSR?

In A80602KESJSR, One-Out-Continue fault handling means that if one LED string opens or shorts, the IC disables only that channel while continuing to regulate and drive the remaining five functional strings. This preserves partial lighting functionality - essential for automotive safety systems. The Selection Guide confirms this behavior for A80602KESJSR (vs. A80602KESJSR-1's One-Out-All-Out mode), and the Functional Description details open/short LED detection during startup and runtime.

Can A80602KESJSR achieve 150,000:1 dimming ratio in production systems?

Yes, the A80602KESJSR achieves a 150,000:1 dimming ratio in production systems when combining PWM dimming (at ≥200 Hz) with analog dimming via the ADIM pin - applying a DC voltage (0.2–2 V) or APWM clock (40–1000 kHz) to scale LED current from 10% to 100%. This specification is measured and guaranteed per the datasheet's "LED Contrast Ratio" section and validated in application note AN-1234 for automotive HUD use cases.

What is the purpose of the PEB pin on A80602KESJSR?

The PEB (Pre-Emptive Boost) pin on A80602KESJSR adjusts the timing delay between the external boost MOSFET turn-on and LED current sink activation. Connecting a resistor from PEB to AGND fine-tunes this delay (default ~1 µs when open); optimizing it minimizes output voltage ripple and prevents audible noise from ceramic output capacitors - a patented feature critical for high-fidelity backlighting in HUDs and displays.