STCF02

Features: The STCF02 is an IC specifically designed to drive the high-current white LEDs used for flash illumination and can support the latest generation of mobile imaging equipment such as cameras for mobile phones, digital still cameras, and PDAs.






In addition to supporting the higher flash illumination powers required by the latest high-resolution image sensors, the device extends battery life thanks to the extremely low standby current of less than 1 microamp that it draws during shutdown mode, one-sixth of the power consumed by alternative devices. The STCF02 also incorporates comprehensive protection circuitry, including, uniquely, the ability to automatically sense and respond to excessive LED temperature.





The STCF02 is a high-efficiency buck-boost converter that is able to deliver a controlled current to a single high-power flash white LED. Accurate current control over the range of battery voltages is essential as the white LED's light output is proportional to the current flowing through it. The STCF02 controls the current by automatically changing the operating mode between buck (step down) and boost (step up) to accommodate the forward voltage of the white LED according to the battery voltage level. The device uses a PWM (pulse-width modulation) control scheme with a switching frequency of 1.8MHz and provides a regulated output voltage ranging from 2.5V up to 5.3V powered from a single lithium-ion battery.