2 Channel White LED Driver with Internal-switch Buck Regulator
The SM21BLA is a high-efficiency white LED driver with internal-switch voltage mode step-down regulator. It drives two channels of LED array with 3% current regulation accuracy between channels. The step-down DC-DC converter provides the regulated supply voltage for LED driving. The SM21BLA features the headroom control which detects the lowest channel voltage and uses it to set the output voltage for higher efficiency. The switching frequency is programmable using an external resistor. The LDO provides the logic voltage for the system. The device is optimized for thin-film transistor (TFT) liquid crystal display (LCD) applications.
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