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T6309A-BX Datasheet(PDF) 1 Page - Taiwan Memory Technology |
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T6309A-BX Datasheet(HTML) 1 Page - Taiwan Memory Technology |
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1 / 13 page  TE CH tm T6309A TM Technology Inc. reserves the right P. 1 Publication Date: MAY. 2007 to change products or specifications without notice. Revision: A Micropower Step-up DC/DC Converter FEATURES • Matched LED Current with Overvoltage Protection • Drives up to 6 LEDs in series • Up to 85% Efficiency • Low 400mV Feedback Reference, Optional 1.19V Feedback Reference • Internal Current Limit 300mA • Under Voltage Lock Out Circuits • 0.1uA Low Shutdown Supply Current • 6-pin SOT-23 Package • ESD Human Body Mode Over 5KV APPLICATIONS • Cellular Phones • Portable Communication Devices • Handheld Electronics • PDAs • LED/Display Back Light Driver PART NUMBER EXAMPLES The T6309A features a minimum off-time current-limited PFM control scheme. The LED current is set with an external sense resistor (Rs) and is regulated by the feedback pin (FB) that regulates the voltage across the sense resistor to 400mV (typ). The low 400mV feedback reference voltage reduces power loss and improves efficiency for LED driver applications. Optional 1.19V feedback reference is available for normal output voltage applications like LCD bias. Output overvoltage protection (OVP) is integrated to prevent damage in case of output open circuit condition (e.g. faulty LED). The OVP pin can monitor the output voltage and turn off the converter in the event of overvoltage condition. The T6309A is available in SOT- 23-6 packages. GRNERAL DESCRIPTION The T6309A is a step-up DC/DC converter that drives LED with a constant current. The device can driver up to 6 series LEDs from a single-cell Li-Ion battery. Series connection of the LEDs provides constant LED current that results in uniform brightness. Part no. Feedback Referemce Voltage T6309A-AX 400mV T6309A-BX 1.19V |
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