A8732 Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver Discontinued Product 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 3, 2013 Recommended Substitutions: For existing customer transition, and for new customers or new appli- cations, contact Allegro Sales. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no respon- sibility for its use nor for any infringements of patents or other rights of third parties which may result from its use.A8732 Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver Features and Benefits Description Ultra small 2 2 DFN/MLP-8 package The Allegro A8732 is a Xenon photoflash charger IC designed Low quiescent current draw (0.5 A max. in shutdown mode) to meet the needs of ultra low power, small form factor cameras, Primary-side output voltage sensing no resistor divider required particularly camera phones. By using primary-side voltage Adjustable switch peak current limit up to 1.5 A with sensing, the need for a secondary-side resistive voltage divider single-wire programming through the CHARGE pin is eliminated. This has the additional benefit of reducing leakage 1V logic (V (min)) compatibility HI currents on the secondary side of the transformer. To extend Integrated IGBT driver with internal gate resistors battery life, the A8732 features very low supply current draw Optimized for mobile phone, 1-cell Li+ battery applications (0.5 A max in shutdown mode). The switch current limit can Zero-voltage switching for lower loss be programmed from 0.45 to 1.5 A, in 16 steps with single wire >75% efficiency interface, through the CHARGE pin. Charge complete indication The IGBT driver also has internal gate resistors for minimum Integrated 50 V DMOS switch with self-clamping external component count. The charge and trigger voltage protection logic thresholds are set at 1 V (min) to support applications HI implementing low-voltage control logic. Package: 8-pin DFN/MLP (suffix EE) The A8732 is available in an 8-contact 2 mm 2 mm DFN/MLP package with a 0.60 maximum overall package height, and an exposed pad for enhanced thermal performance. It is lead (Pb) free with 100% matte tin leadframe plating. 2 mm 2 mm, 0.60 mm height Not to scale Typical Applications + + Battery Input Battery Input C1 C1 2.3 to 5.5 V 1.5 to 5.5 V C C OUT OUT 100F 100F VBAT VBAT 315 V 315 V VOUT Detect VOUT Detect SW SW VIN VDRV VIN VDRV Control Control Block Block C2 I sense C2 I sense SW SW VPULLUP VPULLUP 100 k 100 k CHARGE CHARGE DONE DONE DONE DONE V V IN VDRV IN VDRV IGBT Driver IGBT Driver TRIG TRIG IGBT Gate IGBT Gate GATE GATE GND GND (A) (B) Figure 1. Typical applications: (A) with single battery supply and (B) with separate bias supply 8732-DS