8-Channel High Accuracy Constant Current LED Driver With Error Diagnostics & Power Saving

The MY9183, 8-channel constant current LED driver operates over a 3.0V ~ 5.5V input voltage range, supports error diagnostics, power saving function and current gain control. The device provides 8 open-drain constant current sinking outputs that are rated to 17V and delivers up to 120mA of high accuracy current to each string of LED. The current at each output is programmable by means of an external current-sensing resistor and can be adjusted by 256 steps.

The MY9183 features a fast 30MHz DCK input, allowing large amount data transfer and a wide LED dimming (on/off) range to be implemented. The MY9183 offers a 4-wire serial interface, a 16-bit shift register, and a 8-bit transparent latch. The serial interface allows a microcontroller to configure the output channels using four inputs (DI, DCK, LAT, and ENB) and a data output (DO). DO allows multiple drivers to be cascaded and operated together.

The MY9183 provides compulsory error detection. Under compulsory error detection, the display image will not be affected since the interval and current are small. Differing from error mode selections; the specified diagnostic can be performed. The error will be stored back to the shift register and could be read out from the DO pin. Moreover, the threshold voltage for LED short detection can be selected to comply with different LED string configuration.

The MY9183 is available in a 16-pin SOP / SSOP / TSSOP / QFN package (pin definition compatible with MY9161) and specified over the -40°C to +85°C ambient temperature range.