MP3383 Step-Up WLED Controllers Monolithic Power Systems (MPS) MP3383 Step-Up WLED Controllers include four LED current channels. These controllers can expand the number of LED channels with two or more ICs in parallel sharing a single power source. The MP3383 WLED controllers employ peak current control mode with a fixed Switching Frequency (fSW) that is configurable through an external setting resistor. These controllers drive an external MOSFET to boost up the output voltage from a 6V to 33V input voltage (VIN) supply range.