STCF03TBR STMicroelectronics

STCF03 High power white LED driver with IC 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% QFN20 (4 x 4) TFBGA25 (3 x 3) Output current control 1.8 MHz typ. fixed frequency PWM Packages: Synchronous rectification QFN20 (4 x 4) Full IC control TFBGA25 (3 x 3) Operational modes: Shutdown mode Applications Shutdown + NTC Ready mode + auxiliary red LED Cell phone and smart phone Flash mode: up to 800 mA Camera flashes/strobe Torch mode: up to 200 mA PDAs and digital still cameras Soft and hard triggering of flash Flash and torch dimming with 16 exponential Description values The STCF03 is a high efficiency power supply Dimmable red LED indicator auxiliary output solution to drive a single flash LED in camera Internally or externally timed flash operation phone, PDAs and other hand-held devices. It is a buck - boost converter to guarantee a proper LED Digitally programmable safety time-out in flash current control over all possible conditions of mode battery voltage and output voltage the output LED overtemperature detection and protection current control ensure a good current regulation with external NTC resistor over the forward voltage spread characteristics of Opened and shorted LED failure detection and the flash LED. Thanks to the high efficiency of the protection converter allows having the input current taken from the battery remain under 1.5 A. Chip over temperature detection and protection < 1 A shutdown current Table 1. Device summary Order codes Packages Packaging STCF03PNR QFN20 (4 x 4 mm) 4500 parts per reel STCF03TBR TFBGA25 (3 x 3 mm) 3000 parts per reel February 2011 Doc ID 13169 Rev 7 1/35 www.st.com 35Contents STCF03 Contents 1 Description (continued) 6 2 Diagram . 7 3 Pin configuration . 8 4 Maximum ratings 9 5 Application 10 6 Electrical characteristics 11 7 Introduction . 13 7.1 Buck-boost converter 13 7.2 Logic pin description 13 7.2.1 SCL, SDA pins 13 7.2.2 TRIG pin 13 7.2.3 ATN pin . 13 7.2.4 ADD pin . 14 7.2.5 TMSK pin 14 7.3 IC bus interface 15 7.4 Data validity . 15 7.5 Start and stop conditions . 15 7.6 Byte format 16 7.7 Acknowledge 16 7.8 Writing to a single register 17 7.9 Interface protocol . 17 7.10 Writing to multiple registers with incremental addressing 18 7.11 Reading from a single register . 18 7.12 Reading from multiple registers with incremental addressing . 19 8 Description of internal registers 20 8.1 PWR ON . 20 2/35 Doc ID 13169 Rev 7