A8436 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 10, 2012 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, Inc. 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, Inc. 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.+ A8436 Photoflash Capacitor Charger with IGBT Driver Features and Benefits Description Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries The A8436 is a highly integrated IC that charges photoflash Adjustable output voltage capacitors for digital and film cameras. It also features an >75% efficiency integrated IGBT driver that facilitates the flash discharge Three levels of switch current limit: 1.0, 1.2, 1.4 A function and saves board space. Fast charge time To charge the photoflash capacitor, the A8436 integrates a Charge complete indication 40 V, DMOS switch that drives the transformer in a flyback Integrated IGBT driver with trigger topology, allowing optimized design with tight coupling and No primary-side Schottky diode needed high efficiency. A proprietary control scheme optimizes the Low-profile packages capacitor charging time. Low quiescent current and low shutdown current further improve system efficiency and extend battery life. Packages: Three levels of switch current limit are provided: 1.0, 1.2, and 1.4 A. The level is determined by configuring the ILIM pin as grounded, floating, or pulled up to IC supply voltage, respectively. The CHARGE pin enables the A8436 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8436 stops the charging until the CHARGE TDFN/MLP (suffix EJ) pin is toggled again. Pulling the CHARGE pin low stops 10-pin, 3 mm 3 mm charging. The D O N E pin is an open-drain indicator of when 0.75 mm nominal overall height the designated output voltage is reached. The A8436 can be used with two Alkaline/NiMH/NiCAD or one single-cell Li+ battery connected to the transformer primary. Connect the VIN pin to a 3.0 to 5.5 V supply, which can be either the system rail or the Li+ battery, if used. MSOP (suffix LZ) 10-pin, 3 mm 3 mm The A8436 is available in a very low profile (0.75 mm) 10- 1.10 mm maximum overall height terminal 3 mm 3 mm MLP/TDFN package, making it ideal for space-constrained applications, as well as an MSOP. They Approximate Scale 1:1 are lead (Pb) free, with 100% matte-tin leadframe plating. Typical Applications Two Alkaline/NiMH/NiCAD or one Li+ battery One Li+ battery or 1.5 to 5.5 V V or 3.0 to 5.5 V V 3.0 to 5.5 V BATT T1 D1 D1 BIAS V V V OUT BATT T1 OUT C1 C2 C1 C2 R1 R1 COUT COUT 0.1 F 4.7 F 0.1 F 4.7 F R5 R4 R5 R4 100 k 7 10 k 7 100 k 7 10 k 7 R2 R2 1.4 A 1.4 A VIN VIN SW SW 1.2 A (N.C.) ILIM 1.2 A (N.C.) ILIM 1.0 A FB 1.0 A FB DONE R3 DONE A8436 R3 A8436 CHARGE CHARGE R6 TRIGGERTRIGGER IGBTDRV R6 TRIGGER IGBTDRV 10 k 7 To IGBT Gate GND 10 k 7 R7 To IGBT Gate GND R7 10 k 7 10 k 7 Figure 1. Typical circuit with separate power supply to transformer Figure 2. Typical circuit with single power supply A8436-DS, Rev. 4