Product overview
Description
The STCF04 is a dedicated and space optimized high efficiency solution for driving a flash LED module in cameras, phones, PDAs and other handheld devices using the SuperCap technology. It is based on a DC-DC buck-boost converter, which ensures a proper and efficient charging control and monitoring of the SuperCap in the whole battery voltage range. The output current control ensures a good current regulation over the forward voltage spread characteristics of the flash LEDs in Torch and Flash mode operation. The SuperCap charging current is limited to a defined value which avoids overload of the battery. The SuperCap discharge current flows through the LEDs and the external MOSFET which must be chosen according to the desired flash current.
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All features
- Buck-boost converter with 1.5 A peak current limiting and synchronous rectification
- Burst mode operation when output is charged
- Input voltage range 2.5 V to 5.5 V
- Programmable output charging voltage up to 5.5 V
- Full I²C control
- Operation modes:
- Shutdown mode
- Monitoring mode with NTC and SuperCap monitoring
- Idle mode
- Flash mode
- Torch mode: up to 320 mA
- Controlled LED current in all modes
- Soft and hard triggering of Flash, Torch and Picture light modes
- Torch dimming in 12 exponential steps
- Flash dimming in 8 steps
- Active balancing of SuperCap voltage
- SuperCap status flag
- Internally or externally timed flash operation
- Digitally programmable safety timeout in Flash mode
- Torch mode safety timeout
- LED overtemperature detection and protection with external NTC resistor
- Shorted LED failure detection and protection
- Chip overtemperature detection and protection
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STMicroelectronics - STCF04
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