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Diodes Incorporated AL58263A 16-Channel Constant-Current LED Driver

Diodes Inc. AL58263A 16-Channel Constant-Current LED Driver features a 16-bit grayscale Adaptive Pulse Density Modulation (APDM) for high-accuracy dimming and enhanced visual performance. The APDM dimming architecture improves output current linearity by mitigating non-ideal transient behavior and increases system refresh rate by effectively separating frame waveform components.

The device operates from a 3.0V to 5.0V input supply, supports output channel voltages up to 15V, and interfaces with a 25MHz DCK clock. Each channel delivers up to 45mA of precise, programmable LED current. Channel-level current settings are configurable through the digital interface. In contrast, the overall output current range is set using a single external sensing resistor and two independent 4-bit global current-gain controls, providing separate current adjustment for the Group A and Group B channel banks.

The Diodes Inc. AL58263A integrates comprehensive fault detection and diagnostics, including LED open/short detection. Diagnostic results are stored in internal registers for access by the MCU via the serial interface. A compact, wettable-flank W-QFN4040-24/SWP (Type A1) package is available. The device is specified for operation across -40°C to +105°C ambient temperature range, making it well-suited for demanding automotive lighting applications.

Features

  • 2mA to 45mA output current range at 5.0V
  • 16 constant-current sink output channels
    • 16-bit grayscale resolution
    • Two 4-bit global current control
    • ±1.5% (typ.) channel-to-channel LED current accuracy
    • ±3% (typ.) chip-to-chip LED current accuracy
    • Staggered output delay for EMI reduction
    • Supporting cascaded devices
  • Detection and diagnostics
    • LED open, LED short, output port leakage
    • Output short-to-GND, output short-to-power
    • REXT short-to-GND
    • Pre-overtemperature warning
  • 4-wire serial interface + GCK (LAT, DI, DO, DCK + GCK)
    • Double-edge Grayscale Clock (GCK) up to 16MHz
    • External GCK watchdog timer
    • Zero-data and sleep modes for power saving
  • Register-programmable options
    • Regular PWM or adaptive pulse density modulation
    • Internal PWM generator or external GCK
    • Selectable short-detection thresholds of 2V/3V/4V/4.5V
  • Environmental compliance
    • Lead-free and RoHS-compliant
    • Halogen and antimony-free, Green device

Applications

  • Interior lighting
  • RGB lighting
  • HVAC control panels
  • Exterior lighting

Typical Application Circuit

Application Circuit Diagram - Diodes Incorporated AL58263A 16-Channel Constant-Current LED Driver

Functional Block Diagram

Block Diagram - Diodes Incorporated AL58263A 16-Channel Constant-Current LED Driver

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Diodes Incorporated AL58263Q 16-Channel Automotive LED Driver

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Published: 2026-09-02 | Updated: 2026-09-14