CST5020D is a driver IC for LED display panel design. Its built-in CMOS shift buffer and latch function can convert serial input data into parallel output data format. The input voltage range of CST5020D is 3.3V~5V, providing 16 current sources, which can provide 3~36mA constant current in each output stage to drive LED; The current difference of the output channel in a single IC is less than ±2%@I OUT =23.8mA; ±2.5%@I OUT=3mA; the output current difference between multiple ICs is less than ±3%; The current varies with the output withstand voltage (V DS) and is controlled at 0.1% per volt; The current is also controlled to 1% depending on the supply voltage (VDD) and the ambient temperature. The user can adjust the current of each output stage of the CST5020D by selecting external resistors with different resistance values. With this mechanism, the user can accurately control the brightness of the LED.

    The CST5020D guarantees an output stage withstand voltage of 11V, so it is possible to connect multiple LEDs in series at each output. In addition, the CST5020D also provides a highclock rate input of 25 MHz to meet the high datatransmissionrequirements of the system.