STCF02
High Power White Led Driver
Data Brief
Features
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Buck-boost DC/DC Converter
Drives One Power White Led:
Up To 600mA Between 2.7 To 5.5V
Led Temperature Protection
Output Current Control
1.8 MHz Typ Fixed Frequency PWM
Synchronous Rectification
High Efficiency Across The Total Input Voltage
Range
Operational Modes:
Shutdown Mode
Shutdown Mode With NTC
Flash Mode: Up To 600 mA
Medium Flash Mode
Torch Mode: Up To 250 mA
Adjustable Current In All Three Modes
Peak Inductor Limited To 2.3 A Typ.
LED Disconnected From The Battery In
Shutdown Mode
Programmable Safety Shutdown In Flash
Mode
Over Voltage Protection 5.3V
Short Circuit Protection
Over Temperature Protection
< 1碌A Shutdown Current
QFN20 4 x 4 mm
QFN20
Description
The STCF02 is a high efficiency power supply
solution to drive a single flash LED in camera
phone, PDAs and other hand-held devices. It is a
buck-boost converter to guarantee a proper LED
current control over the battery voltage
(particularly in the case, that the output voltage is
lower than the input voltage); the output current
control ensure a good current regulation over the
forward voltage spread characteristics of the
Flash LED.
Three logic input signal can select 5 modes of
operation: shutdown mode (quiescent current less
than 1碌A typ), shutdown mode with NTC active,
torch mode (Drive the led up to 250 mA), flash
mode (up to 600 mA) and medium flash mode that
reduce the flash current.
The high efficiency of the converter allows having
the input current taken from the battery lower than
1.5A and the peak inductor current is limited to 2.3
Amps typical. Other features include softstart
control, thermal shutdown, short circuit protection,
over voltage protection and LED temperature
protection. Alternatively to LED temperature
protection, a safety flash time out can be easily
implemented. The device is packaged in a QFN
20 leads with a dimension of 4x4 mm and a height
of less than 1mm.
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Applications
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CELL PHONE AND SMART PHONES
CAMERA FLASHES/STROBES
PDAS AND DIGITAL STILL CAMERAS
Order Codes
Type
STCF02PMR
Package
QFN20 (4x4 mm)
Comments
4500 parts per reel
Rev. 1
1/4
www.st.com
4
October 2005
For further information contact your local STMicroelectronics sales office..
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