Allegro MicroSystems Inc. rolled out a pair of multi-output LED drivers for backlighting
automotive LED displays.
The A8502 and A8514 integrate a current-mode boost converter with internal
power switch and multiple current sinks. The LED sinks can be paralleled together
to achieve even higher LED currents. They are capable of operating from a single
power supply from 5 V to 40 V, which allows them to withstand load
dump conditions in automotive systems.
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, provide protection against
output short and overvoltage, open or shorted diode, open or shorted VLED pin,
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 them 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.
Pricing: The A8502KLPTR-T is priced at $2.13 and the A8514KLPTR-T is priced
at $2.24 - both in quantities of 1,000.
Availability: 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 an exposed