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. TFBGA25 (3 x 3 mm)

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

Applications
■ Cell phones and smartphones
■ Camera flashes/strobe
■ PDAs and digital still cameras