Constant-current linear regulator improves LED current tolerance
With its 1.2 W maximum power dissipation, excellent 20 ppm/°C temperature stability and high power-supply rejection ratio, the AL5809 delivers LED currents with a ±5% tolerance over a wide temperature range, simplifying the solutions for its target applications of LED signage, LED strip lighting and low-current retrofit lamps.
The AL5809 is specified for the -40°C to +125°C temperature range, with an operating voltage (between the two terminals) from 2.5 V to 60 V and is offered in various fixed-output current versions; this removes the need for external current setting resistors. The PowerDI-123 package fixed-output current options are 15 mA, 20 mA, 30 mA, 40 mA, 50 mA, 60 mA, 90 mA, 120 mA and 150 mA, while in the alternative SOD-123 package there are current output versions of 15 mA, 20 mA, 30 mA, 40 mA and 50 mA.
As well as meeting the needs of designs requiring a simple linear regulator (e.g. no inductor or external resistor), the AL5809 provides additional performance features over-temperature protection (OTP) and the ability to drive both low- and high-side LED chains.
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.
In 10k 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 15-50 mA parts in the PowerDI-123 package, and $0.12 each for the higher current 60-150mA PowerDI-123 packaged devices.