Linear regulator improves LED current tolerance

5th December 2014

Nat Bowers

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Datasheet

Featuring 1.2W maximum power dissipation, excellent 20ppm/°C temperature stability and high power-supply rejection ratio, a constant current linear LED driver has been introduced by Diodes Incorporated. The AL5809 delivers LED currents with a ±5% tolerance over a -40 to +125°C temperature range, simplifying solutions for LED signage, LED strip lighting and low-current retrofit lamps.

With an operating voltage (between the two terminals) from 2.5 to 60V, the AL5809 is offered in various fixed-output current versions. This removes the need for external current setting resistors. Offering over-temperature protection and the ability to drive both low- and high-side LED chains, the device meets the needs of designs requiring a simple linear regulator (e.g., no inductor or external resistor).

The AL5809 is a small footprint, low BOM-cost LED driver that is simple to use and provides improved accuracy and all-round higher performance than competitive alternatives or discrete circuit designs. It is offered in a robust two-terminal PowerDI-123 or SOD-123 packages. The PowerDI-123 package fixed-output current options are 15, 20, 30, 40, 50, 60, 90, 120 and 150mA, while in the alternative SOD-123 package there are current output versions of 15, 20, 30, 40 and 50mA.

In 10,000 unit quantities, the AL5809 constant current linear LED driver from Diodes Incorporated is priced at: $0.10 each for the SOD-123 packaged devices, $0.11 each for the 15-50mA parts in the PowerDI-123 package, and $0.12 each for the higher current 60-150mA PowerDI-123 packaged devices.