September 2007
Rev. 4
1/35
35
STCF03
High power white LED driver with I
2
C™ interface
Features
■
Buck-boost dc/dc converter
■
Drives one power white LED up to 800 mA from
2.7 V to 5.5 V in QFN
■
Drives one power white LED up to 800 mA from
3.3 V to 5.5 V in BGA
■
Efficient up to 92%
■
Output current control
■
1.8 MHz typ. fixed frequency PWM
■
Synchronous rectification
■
Full I
2
C control
■
Operational modes:
– Shutdown mode
– Sh NTC
– Ready mode + auxiliary red LED
– Flash mode: up to 800 mA
– Torch mode: up to 200 mA
■
Soft and hard triggering of flash
■
Flash and torch dimming with 16 exponential
values
■
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
■
Opened and shorted led failure detection and
protection
■
Chip over temperature detection and protection
■
< 1 µA shutdown current
■
Packages:
– QFN20 (4x4)
– TFBGA25 (3x3)
Applications
■
Cell phone and smart phone
■
Camera flashes/strobe
■
PDAs and digital still cameras
Description
The STCF03 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 all possible conditions of
battery voltage and output voltage; the output
current control ensure a good current regulation
over the forward voltage spread characteristics of
the Flash LED.
Thanks to the high efficiency of the converter
allows having the input current taken from the
battery remain under 1.5 A. (See continuous
description)
TFBGA25 (3x3)
QFN20 (4x4)
Table 1. Device summary
Order code
Package
Packaging
STCF03PNR
QFN20 (4x4 mm)
4500 parts per reel
STCF03TBR
(1)
TFBGA25 (3x3 mm)
3000 parts per reel
1.
Available on request.
