February 2012

Doc ID 17553 Rev 2

1/29

AN3223

Application note

Driver for double flash LED with I²C interface

Introduction

This application note is dedicated to the design of a flash LED driver using the STCF04

device, which is a buck-boost converter with an I²C interface dedicated to charging a super-

capacitor. The schematic, functional description, recommendations for PCB layout, and

external component selection are also covered. This device is designed for driving four

LEDs. A detailed functional description can be found in

Figure 1 below.

Figure 1.

Picture of the demonstration board and the external transistor with TDK

EDLC

AM05038v1

www.st.com