This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available.
Date of status change: December 10, 2012.
Recommended substitution: For existing customer transition, and for new customers or new applications, contact Allegro Sales.
The A8424 charges photoflash capacitors for digital cameras, camcorders, and DSC combos. An integrated 55 V DMOS switch drives the transformer in a flyback topology, optimizing the design for 2-cell Li+ battery input. An integrated IGBT driver with separate source and sink pins allows high performance red-eye reduction implementation.
The A8424 offers a programmable peak switch current limit, from 0.5 to 1.5 A, user-adjustable using a resistor to ground. A proprietary control scheme optimizes the capacitor charging time. Low quiescent current and low shutdown current further improve system efficiency and extend battery life.
The A8424 is available in a 16-contact 3 mm × 3 mm TQFN package with exposed pad for enhanced thermal performance. This small, very thin profile (0.75 mm nominal overall height) package is ideal for space-constrained applications. It is lead (Pb) free, with 100% matte-tin leadframe plating.
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.