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LT3484 - Photoflash Capacitor Charger

The devices feature a VBAT pin, which allows the use of 2 alkaline cells to charge the capacitor. The LT3484-0, -2 and -1 have primary current limits of 1.4A, 1A and 0.7A respectively, resulting in tightly controlled average input current of 500mA, 350mA and 225mA respectively. The three versions are otherwise identical.

The CHARGE pin gives full control of the part to the user. Driving CHARGE low puts the part in shutdown. The DONE pin indicates when the part has completed charging. The LT3484 series of parts are housed in a tiny low profile 2mm × 3mm DFN package.

Features Highly Integrated IC in 2mm × 3mm DFN Package Reduces Solution Size Uses Small Transformers: 5.8mm × 5.8mm × 3mm Fast Photoflash Charge Times: Operates from Two AA Batteries, or Any Supply from 1.8V up to 16V Controlled Average Input Current No Output Voltage Divider Needed No External Schottky Diode Required Charges Any Size Photoflash Capacitor Available in 6-Lead 2mm × 3mm DFN Package Typical Application

Applications Digital Camera and Cell Phone Flash Charger Packaging

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