The SGM3123 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 SGM3123 uses an internal resistor to set the bias current for four LEDs, which are matched to ±5%. The SGM3123'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 SGM3123 requires only a 40mV dropout voltage at a 20mA load on each output to match the LED brightness.
The SGM3123 is available in Green?TQFN-3×3-16L?package. It operates over an ambient temperature range of?-40°C?to +85°C.
Support up to 4 LEDs
Low 40mV Dropout at 20mA
Less than?±5% LED Current Matching
Simple LED Brightness Control
Low Shutdown Current
2.5V to 5.0V Supply Voltage Range
Thermal Shutdown Protection
Operating Temperature Range: -40℃?to +85℃
Available in Green TQFN-3×3-16L Package