Part # Brief L6920DA STEVAL-ILL008V1 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: D flashlight evaluation board based on the L6920DA


Part Details:

STEVAL-ILL008V1 LED flashlight evaluation board based on the L6920DA Data Brief Features High efficiency step-up converter Powered from two cell batteries Output voltage Vout = 3.5 V Minimum operating input voltage Vin = 1 V Description STEVAL-ILL008V1 White LEDs are gaining popularity as sources of illumination due to their high efficiency and reliability. Typical forward voltage drop across a white LED is approximately 3.5 V. When these LEDs are powered from a single or two cell batteries, a boost converter is needed to boost the voltage to drive the LEDs. This evaluation board, based on the L6920DA, implements a high efficiency step-up converter which requires very few passive components to perform the conversion from the battery voltage to the selected output voltage or current. Startup is guaranteed at 1 V and the device operates down to 0.6 V. The device has a very low quiescent current of only 10 µA. An internal synchronous rectifier is implemented with a 120 m P-channel MOSFET, replacing the conventional boost diode, to improve efficiency. This also could reduce the cost of the application since no external diode required. March 2008 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Circuit schematic STEVAL-ILL008V1 1 Circuit schematic Figure 1. Schematic 1 DE D L 1 1 N N O O J4 C J5 C 1 1 3 W 1 .3 /8 R 0 1 1% 2 1 Fu 3 .1u1 C 0 W 4 k /8 R 1 1 5% 2 1 L-53 5


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Brief L6920DA STEVAL-ILL008V1.pdf Datasheet