[[Aimtron Technology]

Description
The AT1454 series is a charger IC for Photoflash capacitor with soft-start function, an IGBT driver for igniting flash tube, adjustable output voltage and adjustable switch on-time to perform energy transition on each charge cycle. The output voltage can be adjusted by simply changing the turn ratio of transformer. AT1454B is sensed by voltage divider connecting to the anode of the rectifying diode. The voltage sensing path is cut off when charging function to be completed to maintain minimum output voltage decay.
The device allows user to control automatic refresh rate on Charge pin. While the Ready pin signals that the capacitor is fully charged.

FEATURE
• 2.5V to 5.5V Supply Voltage Operating Range.
• Low Current Consumption:1mA in operation.
• Adjustable Output Voltage.
• Adjustable Switch On-Time.
• Charge Complete Indicator.
• Built-in IGBT Driver.
• Soft-Start Circuitry.
• Thermal Protection
• Charges Any Size Photoflash Capacitor.
• AT1454 with Auto-Refresh Function.
• AT1454A/B without Auto-Refresh Function.
• Small 10-lead MSOP Package.

APPLICATION
• Digital / Film Camera Flash
• PDA / Cell Phone Flash.