GENERAL DESCRIPTION The SGM3134 low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs.
It is optimized for low power keypad and portable backlighting applications.
The SGM3134 uses an internal resistor to set the bias current for four LEDs, which are matched to ±5%.
The SGM3134's advantages over ballast resistors include much lower bias variation with supply voltage variation, significantly lower dropout voltage, and in some applications, significantly improved efficiency.
The SGM3134 requires only a 40mV dropout voltage at a 20mA load on each output to match the LED brightness.
The SGM3134 is available...

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