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STCF04 bảng dữ liệu(PDF) 1 Page - STMicroelectronics

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This is information on a product in full production.
September 2012
Doc ID 022927 Rev 3
1/43
43
STCF04
High power white LED SuperCap™ driver with I²C interface
Datasheet
production data
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
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)
Table 1.
Device summary
Order code
Package
Packaging
STCF04TBR
TFBGA25 (3 x 3 mm)
3000 parts per reel
www.st.com


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