Worcester, Mass.Allegro MicroSystems Inc. has released two LED driver ICs for use in displays, signs, and control panelsthe A6282 and A6285 which both have 16 constant-current output channels.
The A6282 and A6285 have serial data inputs and outputs, which can be cascaded to create large, megapixel text or video displays. They can also be used in smaller applications such as LCD backlighting or controlling LEDs in an instrument or control panel.
The A6282 is a basic 16-channel driver. Each output can drive up to 50-mA. Its channel-to-channel output current matching of ±3% ensures high-quality displays and is improved over several alternate sources. The A6285 has additional features that enable it to be used in video applications.
Both the A6282 and A6285 operate with LED supply voltages up to 12 V, which allows stacking of three or more LEDs per channel. Logic supply voltage can range from 3.3 V to 5 V, in many cases allowing the device to be powered from the same supply as the LEDs it is driving. Users can adjust the brightness of LEDs controlled by both devices by pulse-width, modulating their output enable inputs. Both devices feature protections such as undervoltage lockout (UVLO) and thermal shutdown.
The A6282 is available in 24-lead surface-mount packages: QFN, SOIC, and TSSOP. The A6285 comes in a 32-lead QFN.
Pricing: In 1k quantities is as follows: A6282 in QFN: $0.60; SOIC: $0.65; and HTSSOP: $0.67. A6285 in QFN: $1.16.
Availability: Samples in all packages are available now. Lead-time for large-production quantities is about 12 to 14 weeks.
Datasheets: A6282 and A6285.
Allegro MicroSystems Inc., www.allegromicro.com