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 A8724 provides a robust Xenon photoflash solution for a wide range of cameras. Its wide battery voltage specifications allow designers to use a common device for camera using 2 or 4 cell Alkaline batteries as well as 1 or 2 cell Lithium ion batteries. Its 55 V rated integrated power switch provides ample design margin, even for the 2 cell Lithium ion battery designs.
The A8724 detects the output voltage on the primary side and it eliminates the external feedback resistors. If the output diode or the secondary winding are disconnected, it prevents the output capacitor from being overcharged.
The A8724 features a flexible current limit scheme. The current limit is set by an external resistor at ISET, allowing designers to optimize the camera performance. The A8724 is protected against open circuit and short circuit condition on the ISET pin. Once the current limit is set, it can be optionally programmed as a percentage of the set current through a single wire interface, through the CHARGE pin.
The A8724 features an integrated flexible IGBT gate driver, with independent source and sink pins.
The A8724 is available in a 10-contact 3 mm × 3 mm TDFN package. This small, low profile (0.75 mm) 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.