The SGM3133 is a current-regulated white LED driver with integrated low dropout current sources and a high efficiency charge pump. The charge pump has automatically selectable 1×/1.5× fractional operation modes. The SGM3133 is well suited for white LED applications powered by a Li-Ion battery due to small equivalent open-loop resistance in 1× mode. The supply voltage operates from 2.7V to 5.5V.
The SGM3133 contains a 4-bit digital-to-analog converter for 16-step LED current control. The LED current can be set between 1.25mA and 20mA by a serial pulse input signal into the EN/SET pin. Built-in soft-start circuitry avoids excessive inrush current during startup and mode transition.
The SGM3133 is available in a Green TQFN-3×3-16L package. It is specified over an ambient temperature range of -40℃ to +85℃.