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STCF05 Datasheet(PDF) 1 Page - STMicroelectronics

No. de pieza STCF05
Descripción Electrónicos  High power white LED driver with I짼C interface
Download  33 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STCF05 Datasheet(HTML) 1 Page - STMicroelectronics

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July 2010
Doc ID 15257 Rev 4
1/33
33
STCF05
High power white LED driver with I²C interface
Features
Boost DC-DC converter with synchronous
rectification
Drives 2 power white LEDs in series with a
current up to 400 mA
Input voltage range 2.5 V to 5.5 V
Needs 3 external components only
Output current control
1.8 MHz fixed frequency PWM control
Peak inductor current limited to 3 A
Full I²C control
Operational modes:
– Standby mode
– Standby mode with NTC
– Flash mode: up to 400 mA
– Torch mode: up to 120 mA
Soft and hard triggering of flash
Flash and Torch dimming in 15 exponential
steps
Dimmable red LED indicator auxiliary output
Internally or externally timed flash operation
Digitally programmable safety time-out in flash
mode
LED overtemperature detection and protection
with external NTC resistor
Open and shorted LED failure detection and
protection
Chip overtemperature detection and protection
Less than 1 µA standby current
Package 3 x 3 mm TFBGA25
Applications
Cell phones and smartphones
Camera flashes/strobe
PDAs and digital still cameras
Description
The STCF05 is a high efficiency power supply
solution to drive multiple flash LEDs in camera
phones, PDAs and other hand-held devices. The
synchronous boost topology with output current
control guarantees the proper LED current over
all possible conditions of battery level and LED
forward voltage. All the functions of the device are
controlled through the I²C bus that allows to
reduce logic pins on the package and to save
PCB traces on the board. Hard and soft-triggering
of the flash are both supported. The device
includes many functions to protect the chip and
the power LEDs. These comprehend a soft-start
control, chip over temperature detection and
protection, open and shorted LEDs detection and
protection. In addition, a digital programmable
time-out function protects the LEDs in case of
wrong command from microprocessor. See
description (continued).
TFBGA25 (3 x 3 mm)
Table 1.
Device summary
Order code
Package
Packaging
STCF05TBR
TFBGA25 (3 x 3 mm)
3000 parts per reel
www.st.com


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