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T6309B

Taiwan Memory Technology
Part Number T6309B
Manufacturer Taiwan Memory Technology
Description Micropower Step-up DC/DC Converter
Published Jan 12, 2009
Detailed Description tm TE CH T6309B Micropower Step-up DC/DC Converter FEATURES • Matched LED Current with Overvoltage www.DataSheet4U.c...
Datasheet PDF File T6309B PDF File

T6309B
T6309B

Overview
tm TE CH T6309B Micropower Step-up DC/DC Converter FEATURES • Matched LED Current with Overvoltage www.
DataSheet4U.
com Protection • Drives LEDs in series • Up to 85% Efficiency • Low 400mV Feedback Reference, Optional 1.
19V Feedback Reference • Internal Current Limit 250mA • Under Voltage Lock Out Circuits • 0.
1uA Low Shutdown Supply Current • 6-pin SOT-23 Package • ESD Human Body Mode Over 5KV GRNERAL DESCRIPTION The T6309B is a step-up DC/DC converter that drives LED with a constant current.
The device can driver up to 3 series LEDs from a single-cell Li-Ion battery.
Series connection of the LEDs provides constant LED current that results in uniform brightness.
The T6309B 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 effi...


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