By Alix Paultre, contributing editor

Diodes
Incorporated’s AL5814, AL5817, AL5815, and AL5816 linear LED controllers
deliver dimmable and adjustable drive current for LED strings with more than
80% efficiency. Accepting an input from 4.5 V to 60 V, the inductor-free
devices maintain good EMI performance, making system integration simpler, and
internal power dissipation is also minimized due to an external power
transistor.

The AL58xx series
can provide up to 15 mA to an external MOSFET or bipolar transistor to drive
LED strings, and the drive current is configured by an external resistor with
4% reference voltage accuracy. Delivering excellent temperature stability, the
AL5815 and AL5816 devices support PWM dimming, while the AL5814 and AL5817
devices support both analog and PWM dimming.

Protection features include overtemperature and
input undervoltage lock-out. The AL5814 and AL5817 devices also provide “LED
open” protection via a VFAULT pin, as well as LED thermal fold-back protection.
The AL58xx series is available in SOT-25 and thermally enhanced MSOP-8EP
packages. The AL5815 and AL5816 are priced at $0.15 each in 10K quantities,
while the AL5814 and AL5817 are priced at $0.20 in 10K quantities.