July 20, 2011
Worcester, MA – Allegro MicroSystems, Inc. announces two new multi-output LED drivers for LCD backlighting. The A8502 and A8514 integrate a current-mode boost converter with internal power switch and multiple current sinks. The LED sinks can be paralleled to-gether to achieve even higher LED currents. They are capable of operating from a single power supply from 5 V to 40 V which allows the part to withstand a load dump condition encountered in automotive systems.
Both the A8502 and A8514 LED drivers can optionally drive an external PMOS to disconnect input supply from the system in the event of a fault. The devices, coupled with the external PMOS disconnect switch, provides protection against output short and overvoltage, open or shorted diode, open or shorted VLED pin, and over-temperature.
A dual level cycle-by-cycle current limit function provides soft start and protects the internal current switch against high current overloads. They have a high PWM switching frequency (>2 MHz) which allows the devices to operate above the AM radio band. They also have a synchronization pin if the user wishes to be synch in the range of 600 kHz to 2.25 MHz.
The A8502KLPTR-T is offered in the 16-pin SSOP package and the A8514KLPTR-T is offered in the 20-pin SSOP package both with exposed thermal pad. Both devices have a 16-week typical lead-time (ARO) to market.
Allegro MicroSystems, LLC is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.