AL58263

Description

The AL58263 is a 16-channel constant-current LED driver with 16-bit grayscale Adaptive Pulse Density Modulation (APDM) and supports error diagnostics, power-saving functionality, and current gain control. This distinctive APDM technology abates the non-ideal IOUT distortion due to non-symmetric transient responses and enhances the refresh rate by efficiently separating the frame waveform.

The device operates over a 3V to 5.5V input voltage range, 15V output channel voltage, fast 25MHz DCK input, and delivers up to 55mA of high-accuracy current to each LED string. Each channel’s output current can be programmable through a digital interface individually. All channels’ output current can be set by one external sensing resistor, along with a 6-bit global current control register.

The AL58263 has built-in diagnostics and LED open/short protection, including error detection. These error results are stored in a register for the MCU to read out.

The AL58263 is available in the TSSOP-24EP (Type A1-B) and W-QFN4040-24/SWP (Type A1) packages, and is specified over the - 40°C to +85°C ambient temperature range.

Feature(s)

• Input Voltage VDD: 3V to 5.5V
• Output Current Range
  • 2~55mA/5V, 2~35mA/3.3V
  • ±0.1% Output current regulation capability
  • 6-bit global current control: from 12.5% to 200%
• 16 Constant-Current Sink Output Channel
  • 16-bit grayscale resolution with Adaptive Pulse Density Modulation control
  • 15V rated output channels for long LED strings
  • Fast Transient Response—supports external grayscale clock with double edge up to 16MHz
  • ±1.5% (typ.) LED Current accuracy between channels
  • ±3% (typ.) LED Current accuracy between chips
  • Non-scramble waveform for high power LED application
  • Grayscale counter reset selection
  • Grayscale data synchronization selection
• Diagnosis and Protections
  • Error detection includes LED Open, LED Short, Output port leakage, Output short-to-GND, Output short-to-Power and REXT short-to-GND
  • Error detection LEDs on at 0.1mA to avoid any flickering
  • Short detection threshold voltage selection (2/3/4/4.5V)
  • Sleep and 0-data mode to lower down the supply current
  • Pre-overtemperature warning
• 4-Wire Serial Interface (LAT, DI, DO, DCK)
  • 25MHz clock frequency for data transfer
  • EMI reduction grayscale clock
  • Cascaded capability (Max 1,440 devices)
  • External GCK watchdog
  • Stagger outputs delay for EMI reduction
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
• An automotive-compliant part is available under a separate datasheet (AL58263Q).

Application(s)

• Indoor and outdoor LED video displays
• Variable message signs (VMS)
• Traffic signs
• Outdoor billboard signage
• LCD display backlighting