Introduction
Light-Emitting Diodes (LEDs) and LED displays suffer from varying illumination levels as a result of changes in power supply voltages. This is true for displays used in automotive applications, battery-operated handheld devices, or fixed (architectural) installations. To keep LED brightness constant, it is necessary to stabilize the LED’s current over the anticipated power supply voltage variation range.

• Supplies stable bias current for Light Emitting Diodes (LEDs)
• Low Voltage Drop of 0.75V maximizes system DC efficiency
• LED drive current adjustable via single external resistor (20 – 60 mA range)
• Negative temperature coefficient protects LEDs against thermal runaway
• Low Cost, Low External Parts Count, Easy-to-Use, Fast Time-To-Market
• Small Surface-Mount SOT143R packaging (2.9 x 1.6 x 1.1 mm inc. leads)