STCF04 Datasheet, PDF (1/43 Pages) STMicroelectronics – Cell phones and smartphones

STCF04
High power white LED SuperCap™ driver with I²C interface
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
Datasheet − production data
TFBGA25 (3 x 3 mm)
Applications
■ Cell phones and smartphones
■ Camera flashes/strobe
■ PDAs and digital still cameras
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.
Table 1.
Device summary
Order code
STCF04TBR
Package
TFBGA25 (3 x 3 mm)
Packaging
3000 parts per reel
September 2012
This is information on a product in full production.
Doc ID 022927 Rev 3
1/43
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