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| STCF02 High Power White Led Driver Data Brief Features I I I I I I I I Buck-boost DC/DC Converter Drives One Power White Led: Up To 600mA Between 2.7 To 5.5V Led Temperature Protection Output Current Control 1.8 MHz Typ Fixed Frequency PWM Synchronous Rectification High Efficiency Across The Total Input Voltage Range Operational Modes: Shutdown Mode Shutdown Mode With NTC Flash Mode: Up To 600 mA Medium Flash Mode Torch Mode: Up To 250 mA Adjustable Current In All Three Modes Peak Inductor Limited To 2.3 A Typ. LED Disconnected From The Battery In Shutdown Mode Programmable Safety Shutdown In Flash Mode Over Voltage Protection 5.3V Short Circuit Protection Over Temperature Protection < 1A Shutdown Current QFN20 4 x 4 mm QFN20 Description The STCF02 is a high efficiency power supply solution to drive a single flash LED in camera phone, PDAs and other hand-held devices. It is a buck-boost converter to guarantee a proper LED current control over the battery voltage (particularly in the case, that the output voltage is lower than the input voltage); the output current control ensure a good current regulation over the forward voltage spread characteristics of the Flash LED. Three logic input signal can select 5 modes of operation: shutdown mode (quiescent current less than 1A typ), shutdown mode with NTC active, torch mode (Drive the led up to 250 mA), flash mode (up to 600 mA) and medium flash mode that reduce the flash current. The high efficiency of the converter allows having the input current taken from the battery lower than 1.5A and the peak inductor current is limited to 2.3 Amps typical. Other features include softstart control, thermal shutdown, short circuit protection, over voltage protection and LED temperature protection. Alternatively to LED temperature protection, a safety flash time out can be easily implemented. The device is packaged in a QFN 20 leads with a dimension of 4x4 mm and a height of less than 1mm. I I I I I I I I I Applications I I I CELL PHONE AND SMART PHONES CAMERA FLASHES/STROBES PDAS AND DIGITAL STILL CAMERAS Order Codes Type STCF02PMR Package QFN20 (4x4 mm) Comments 4500 parts per reel Rev. 1 1/4 www.st.com 4 October 2005 For further information contact your local STMicroelectronics sales office.. STCF02 QFN20 (4x4) MECHANICAL DATA mm. DIM. MIN. A A1 A2 A3 b D D2 E E2 e L ddd 0.18 3.875 0.75 3.875 0.75 0.45 0.35 0.8 TYP 0.9 0.02 0.65 0.25 0.23 4.00 1.7 4.00 1.7 0.50 0.55 0.30 4.125 2.25 4.125 2.25 0.55 0.75 0.08 7.1 152.6 29.5 152.6 29.5 17.7 13.8 MAX. 1.00 0.05 1.00 MIN. 31.5 TYP. 35.4 0.8 25.6 9.8 9.1 157.5 66.9 157.5 66.9 19.7 21.7 11.8 162.4 88.6 162.4 88.6 21.7 25.9 3.1 MAX. 39.4 2.0 39.4 mils 7169619-D 2/4 STCF02 1 Revision History 1 Revision History Date 05-Oct-2005 Revision 1 Data Brief. Description of Change 3/4 1 Revision History STCF02 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 4/4 |
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