Analog Devices Inc.

Photoflash Capacitor Chargers with Automatic Refresh Features: Charges 220µF to 320V in 3.7 Seconds from 5V (LT3420) Charges 100µF to 320V in 3.5 Seconds from 5V (LT3420-1) Charges Any Size Photoflash Capacitor Supports Operation from Two AA Cells or Any Supply from 1.8V to 16V Controlled Peak Switch Current: 1.4A (LT3420) 1.0A (LT3420-1) Controlled Input Current: 840mA (LT3420) 450mA (LT3420-1) Uses Standard Transformers Efficient Flyback Operation (>75% Typical) Adjustable Output Automatic Refresh Charge Complete Indicator No High Voltage Zener Diode Required No Output Voltage Divider Required Small 10-Lead MSOP Package Small 10-Lead (3mm × 3mm) DFN Package

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