Allegro MicroSystems A80602KESJSR-1

Overview

A80602KESJSR-1 from Allegro MicroSystems is an AEC-Q100 qualified automotive LED driver IC implementing a current-mode boost/SEPIC converter with external N-MOSFET gate driver, six integrated 140 mA current sinks, Pre-Emptive Boost control, and One-Out-All-Out fault handling. It operates from 4.5–40 V input, supports PWM dimming down to 0.3 µs on-time, and delivers ultra-high 150,000:1 contrast ratio using combined PWM/analog dimming - deployed in automotive exterior lighting and heads-up displays.

For engineers reviewing the A80602KESJSR-1 datasheet, A80602KESJSR-1 pinout, A80602KESJSR-1 application, or A80602KESJSR-1 equivalent, key selection considerations include its 24-pin wettable-flank QFN package, 260 kHz–2.3 MHz programmable switching frequency, ASIL B–compliant fault architecture, 140 mA per channel current sink accuracy (±0.7%), and thermal shutdown at 155°C.

Technical Context

The A80602KESJSR-1 integrates a current-mode boost/SEPIC controller with cycle-by-cycle peak current limiting, external N-MOSFET gate drive (2 A peak), and independent 6-channel LED current regulation. Its Pre-Emptive Boost (PEB) algorithm synchronizes boost switch timing with LED sink activation to minimize output ripple and enable sub-microsecond PWM on-times without MLCC audible noise.

It features dual dimming paths: EN/PWM pin for high-ratio pulse-width control (200 Hz–2 kHz), and ADIM pin supporting either DC voltage (0.2–2 V) or APWM clock (40–1000 kHz) for analog-level current scaling. Fault management includes open/shorted-LED detection, overvoltage protection (OVP), input overcurrent latching, and thermal shutdown with 20°C hysteresis.

Key Specifications

Pinout & Package

Package: 24-pin 4 mm × 4 mm QFN with wettable flank and exposed thermal pad (ES package). Requires direct connection of exposed pad to PCB ground plane via ≥8 thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3409QMY/NOPB and TPS92692QPWPRQ1, the A80602KESJSR-1 uniquely combines six precision current sinks, external MOSFET gate drive, Pre-Emptive Boost, and One-Out-All-Out fault response - making it the only option qualified for ASIL B-compliant exterior lighting and HUD systems requiring >100,000:1 dimming ratio.

Availability

A80602KESJSR-1 is available at Aetrix Electronics and suitable for automotive exterior lighting, heads-up display, and mid-size LCD backlighting requiring stable component supply across extended temperature ranges and rigorous qualification standards.

Supply support for A80602KESJSR-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 semiconductor company specializing in high-performance power ICs, magnetic sensors, and motor driver solutions for automotive and industrial markets.

The A80602 product line was designed specifically for high-reliability, high-dimming-ratio automotive LED lighting - addressing thermal, EMI, and functional safety challenges in exterior lamps, HUDs, and digital instrument clusters.

FAQ

What is the key functional difference between A80602KESJSR-1 and A80602KESJSR?

The A80602KESJSR-1 implements One-Out-All-Out fault handling, meaning any single LED string fault causes immediate shutdown of all six channels. In contrast, the A80602KESJSR uses One-Out-Continue architecture, which disables only the faulty channel while maintaining operation of the remaining five. This distinction makes A80602KESJSR-1 suitable for ASIL B–compliant systems requiring fail-safe behavior, whereas A80602KESJSR-1 prioritizes system uptime over strict safety shutdown.

Does A80602KESJSR-1 support both boost and SEPIC topologies?

Yes, A80602KESJSR-1 supports both boost and SEPIC configurations via external component selection. Its current-mode controller and gate driver are topology-agnostic; users configure the external power stage (inductor, diode, capacitor) to implement either topology. SEPIC is preferred when output voltage may exceed or fall below input voltage - such as in start-stop automotive systems where VIN dips to 4 V while V_OUT must remain at 24 V.

How does the Pre-Emptive Boost (PEB) feature improve performance in A80602KESJSR-1?

The Pre-Emptive Boost (PEB) feature in A80602KESJSR-1 reduces output voltage ripple by precisely delaying LED current sink activation until after the boost switch has charged the output capacitor. This avoids simultaneous switching noise and enables stable regulation even at 0.3 µs PWM on-times. As a result, A80602KESJSR-1 achieves <20 mV_PP ripple and eliminates audible noise from MLCCs - critical for HUD and interior lighting applications.

What thermal design considerations apply to A80602KESJSR-1 in automotive applications?

A80602KESJSR-1 requires careful thermal management due to its 37 °C/W R_θJA on a 4-layer JEDEC board. The exposed thermal pad must be soldered to the PCB ground plane using ≥8 vias (0.3 mm diameter minimum) to maintain junction temperature ≤150°C at 125°C ambient. For 840 mA total LED current, derating is required above 85°C ambient; Allegro's Application Note AN2998 provides layout guidelines for optimal heat dissipation in engine bay or dashboard mounting.

Can A80602KESJSR-1 drive LED strings with different forward voltages?

Yes, A80602KESJSR-1 supports mixed LED string configurations. Each of the six current sinks operates independently with its own cathode connection (LED1–LED6), allowing strings with varying V_f (e.g., red vs. white LEDs) to be driven simultaneously. However, the boost/SEPIC output voltage must be set to accommodate the highest V_f string plus headroom - typically ≥3 V margin - and OVP threshold must be adjusted accordingly using the ROVP resistor.