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STCF01PMR 데이터시트(PDF) 1 Page - STMicroelectronics

부품명 STCF01PMR
상세설명  Step-up converter for cell phone camera flash LEDs
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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October 2006
Rev. 4
1/16
16
STCF01
Step-up converter for cell phone camera flash LEDs
General features
Supply voltage range: 2.6V to 5.5V
17V Maximum output voltage
Two current levels up to 300mA set with
external resistors
Dedicated pin to select the required level of
current
Operating frequency: 1.5MHz: PWM Controller
Torch mode supported
Shutdown pin with true load disconnection
Efficiency: 90% at 100mA; 80% at 300mA
DFN10L (3mm x 3mm) Package
Description
The STCF01 is a dedicated IC designed to drive
two, three, or four white, cell phone camera flash
LEDs with constant current. The step-up (boost)
converter input is connected directly to the battery,
and its converter output voltage is automatically
determined using current feedback-based duty
cycle control.
The STCF01 has a dedicated pin for two levels of
LED current selection. An external resistor is used
to set the required current for each level.
Compared to the linear current control technique,
this method allows designers to achieve the best
and most efficient performance possible with the
selected current, thereby avoiding linear element
losses.
The Shutdown (SHDN) pin saves power when the
camera flash is not used by consuming less than
0.1µA of current. When the SHDN pin is high
(logic '1'), the device is turned OFF and there is no
DC current path from the supply to the white LEDs
(Load Disconnect). If it is held to GND, the output
current continuously flows through the LEDs
(Torch mode). The SHDN pin, when it is set to low
(logic '0'), is also used to set the flash function
time duration.
www.st.com
DFN10L (3x3)
Order code
Part number
Package
Packaging
STCF01PMR
DFN10L (3mm x 3mm)
4500 parts per reel


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