STCF05 Datasheet, PDF (1/33 Pages) STMicroelectronics – High power white LED driver with I²C interface

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
TFBGA25 (3 x 3 mm)
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).
Table 1.
Device summary
Order code
STCF05TBR
Package
TFBGA25 (3 x 3 mm)
Packaging
3000 parts per reel
July 2010
Doc ID 15257 Rev 4
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