Description

The AS3685C is low noise high efficiency photoflash driver. Its capacitive charge-pump operates in 1:1, 1:1.5 and 1:2 modes. The charge-pump mode switching is done automatically.

The AS3685C can drive one flash LED up to 1000mA current. It supports flash/torch and indicator mode for the flash LED. Additionally the AS3685C limits the flash time automatically to protect the flash LED.

Through the single-wire interface or the two-wire interface, 17 current levels are programmable.

The AS3685C is available in a tiny 12 pin WL-CSP or in a 10 pin DFN package.

AS3685 variants:

1. AS3685A: "direct control" interface (three selectable currents)
2. AS3685B: "single wire" or "two-wire" interface (17 selectable currents)
3. AS3685C: "I2C" interface for full programming
4. An additional variant locks the 1:2 CP mode (see datasheet for more info)

주요 특징

• High Efficiency capactive charge pump (1:1, 1:1.5, 1:2)
• 1:2 CP mode can be disabled (see datasheet for variant)
• Automatic CP mode switching
• LED cathode disconnect in shut-down
• Overtemperature Protection
• Flash LED timeout protection (800ms)
• Packages:
  • DFN10 3x3mm
  • WL-CSP12 2x1.5mm

적용분야

• Mobile phones
• Smart phones
• Digital Still Cameras (DSC)

Block diagram for AS3685C - 1A Photoflash Driver