AL58263A 16-Channel Constant-Current LED Driver

Introduction

The Diodes Incorporated AL58263A is a 16-channel constant-current LED driver designed for applications requiring individually controlled LED outputs, fine grayscale dimming and integrated fault reporting. Its Adaptive Pulse Density Modulation (APDM) architecture supports 16-bit grayscale control while separating frame waveform components to improve output-current linearity and system refresh rate.

With 16 constant-current sink channels, programmable output current and a serial control interface, the device is specified for automotive lighting applications where controlled brightness, channel consistency and diagnostics are important.

What it does

The AL58263A drives up to 16 LED channels through constant-current sink outputs. Each channel supports output current settings from 2mA to 45mA at a 5.0V supply, while the device accepts a 3.0V to 5.0V input supply and supports up to 15V at an output channel.

Brightness control is provided through 16-bit grayscale dimming using APDM. Two 4-bit global current controls provide a further means of adjusting LED current across the device. The specified typical channel-to-channel current accuracy is ±1.5%, with typical chip-to-chip accuracy of ±3%.

Configuration, grayscale data and diagnostic information are handled through a 4-wire serial interface with grayscale clock support: LAT, DI, DO and DCK, plus GCK. The DCK clock is specified up to 25MHz, and the double-edge grayscale clock operates up to 16MHz.

Integrated diagnostics monitor LED and output conditions, with results available through the serial interface. Selectable short-detection thresholds of 2V, 3V, 4V and 4.5V allow the fault-detection setting to be matched to the LED output arrangement.

Applications

• Automotive interior or exterior LED lighting assemblies
• Multi-channel indicator and status-light systems
• Animated LED lighting requiring high-resolution grayscale control
• LED modules where serial diagnostics can help identify output or LED faults
• Compact lighting control boards with individually regulated LED channels

Design considerations

The AL58263A uses a W-QFN4040-24/SWP (Type A1) wettable-flank package, an option relevant to designs that need visible solder-joint inspection.

System designers should account for the 3.0V to 5.0V supply range, the maximum 15V output-channel voltage, and the desired per-channel current setting. The serial interface requires connections for LAT, DI, DO and DCK, while grayscale operation also uses GCK. Clock-frequency limits should be considered when planning the controller interface and dimming update scheme.

For diagnostic integration, the host controller needs to read fault results through the serial interface. The selectable short-detection threshold should also be chosen according to the intended output and LED configuration. The specified operating ambient range is -40°C to +105°C.

Availability and further information

Further technical details, including electrical characteristics, timing information, package data and diagnostic behavior, are available through the source/distributor and datasheet links on this page.