STLD20D

The STLD20D is a constant switching frequency boost regulator with specific features to supply up to 4 white LEDs in series. A stable LED current regulation, from 2.8V to 4.2V, is achieved by sensing the LED current through a low hmic shunt resistor R_LED (see figure 1). The device also includes a supply rejection circuit that prevent any kind of flickering effect on the display during dynamic supply voltage variation. A LED disconnect switch cut the LED branch to reduce the current consumption in shutdown mode. The maximum peak inductor current can be programmed. The STLD20D includes often numerous features and innovative design circuit that allows getting an efficiency above 80% across the total supply voltage range.