Designed to drive series-connected LEDs with a constant current, the three high-performance devices in the AP880X family of step-down DC-DC converters operate at switching frequencies up to 600kHz and require the addition of just four components to support up to 13 LEDs from voltage sources of between 8 and 48 volts.

The new devices enable designers to specify smaller and lower cost inductors and capacitors. The new drivers ensure uniform LED brightness and eliminate the need for ballast resistors.

For an operating voltage range of 8 to 28 volts, the AP8800 will furnish a string of seven LEDs with a current up to 350mA, providing a cost-effective match for 1 watt LED systems. For higher output power, the AP8801 produces a drive current of 500mA from a peak operating voltage of 48 volts, to support up to 13 series-connected LEDs. The third device in the family, the AP8802, meets the requirements higher power 3 watt LED systems, driving up to 13 series-connected LEDs with constant LED current of up to 1 amp. All three devices deliver efficiencies up to 92 per cent.

To reduce the stress on LEDs, the AP880X drivers feature an integrated soft-start function, which helps to extend LED lifetime. To increase design flexibility, the new devices also offer the choice of PWM and DC input dimming control. All three drivers are available in the industry-standard SOP-8L package. Additionally the AP8800 and AP8801 are offered in MSOP-8L package and the AP8802 in exposed pad DFN and SOP-8L packages.

The AP880X family targets a broad range of general illumination applications including signs, architectural and emergency lighting and MR16 lamp replacement.