The AL58221 is a 12-channel (R/G/B x 4), constant-current, Adaptive Pulse Density Modulation (APDM) LED driver which operates over a 3V~5.5V input voltage range. The device provides 12 open-drain constant-current sinking outputs that are rated to 24V and delivers up to 60mA of high-accuracy current to each string of LED. Each channel’s average output current can be individually programmable through a digital interface. The current at each output is set by three external current-setting resistors.