STCF05 datasheet(1/33 Pages) STMICROELECTRONICS

部件名	STCF05

功能描述	High power white LED driver with I²C interface

PDF	33 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 33 page

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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