[Aimtron Technology]

General Description
The AT1453 is a charger control IC for Photoflash capacitor with soft start function, adjustable maximum duty cycle and auto-discharge (soft start capacitor) circuit. Adjustable soft start is programmed with an external capacitor on SS pin. The control technique allows for the use of external resistor to change the switching duty and use of transformer to control the input current. A logic high on the CHARGE pin initiates charging, while the READY pin signals that the capacitor is fully charged. It is ideal for DSC flash unit.

FEATUREs
• 2.5 to 5.5V supply voltage operating range.
• Low current consumption: 1mA in operation,
• 50 kHz or 100kHz operation frequency .
• Built-in maximum duty control.
• Push-pull output.
• Built-in soft start circuit.
• Built-in auto-discharge function.

APPLICATIONs
• Digital Still Cameras flash unit