LED Driver ICs target automotive infotainment applications.
July 28, 2011 -
As multi-output LED drivers for LCD backlighting, A8502 and A8514 integrate current-mode boost converter with internal power switch and multiple current sinks. LED sinks can be paralleled together to achieve higher LED currents. Operating from single power supply from 5-40 V, ICs can optionally drive external PMOS to disconnect input supply from system in case of fault. Both products offer diverse protection features, PWM switching frequency of greater than 2 MHz, and synchronization pin.
Original Press release
Allegro MicroSystems Inc.
115 N.E. Cutoff, P.O. Box 15036
Worcester, MA, 01615
USA
Allegro MicroSystems, Inc. Announces New Automotive Infotainment LED Driver ICs
Robust Solutions for Backlighting Automotive LED Displays
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. The A8502KLPTR-T is priced at $2.13 and the A8514KLPTR-T is priced at $2.24 - both in quantities of 1,000.
About Allegro
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor IC's. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.
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