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June 2012 Doc ID 023187 Rev 1 1/4
4
STEVAL-TLL008V2
Camera flash with SuperCap™ daughterboard
based on the STCF04
Data brief
Features
■ 1.8 MHz buck-boost converter with 1.2 A peak
■ Current limiting and synchronous rectification
■ Programmable current limit
■ Burst mode operation when output is charged
■ Selectable 200 mA / 400 mA SuperCap™
charging current
■ Input voltage range 2.7 V to 5.5 V
■ Programmable output charging voltage up to
5.5 V
■ Full I
2
C control
■ Controlled LED current in all modes
■ Shorted LED failure detection and protection
■ RoHS compliant
Description
The STEVAL-TLL008V2 demonstration board is a
daughterboard working in conjunction with the
STEVAL-TLL008V1 and was designed to
demonstrate the performance of the STCF04
device, which is a buck-boost converter with an
I
2
C interface dedicated to charging a
SuperCap™.
All LEDs with a forward voltage range from 2.5 V
to 5 V are compatible with the STCF04. The
forward voltage spread of any selected LED must,
however, be within this range (2.5 V to 5 V).
It is possible to set the level of the LED current in
Flash mode and torch mode by setting the
dimming registers.
The maximum level of the LED current in Flash
mode can be set by changing the external flash
resistor.
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