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National's new DC/DC converters with true shutdown isolation

Posted: 30 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:National Semiconductor? DC/DC converter? LM3502? LM3503?

National Semiconductor Corp. introduced two additional members of its family of fixed-frequency, current-mode controlled step-up DC/DC converters with true shutdown isolation. Available in a 10-bump micro SMD package or low-profile 16-pin LLP package, the LM3502 and LM3503 converters promise to provide a complete solution for driving dual-display or large, single white LED string backlighting applications.

In portable applications with large format or multiple displays, the LM3502 and LM3503 provide an output voltage of 40V that drives up to 10 white or blue LEDs in one or two series strings. Either one or both of the strings can be independently enabled or shut off. When shut down, the converters completely disconnect the input from the output, creating total isolation and preventing any leakage currents from trickling into the LEDs. A single external resistor is used to set the maximum LED current in driver applications. The LED brightness can be controlled by a PWM signal with the LM3502 and by an analog signal with the LM3503.

In quantities of 1,000, the LM3502 and the LM3503 are priced at $2.11 (10-bump micro SMD package) and $1.93 (16-pin LLP package). Pb-free packaging options are also available.

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Related Datasheets
Part Number Description Category
? LM3502 Step-Up Converter for White LED Applications from the PowerWise? Family ICs, Interface
? LM3503 Dual-Display Constant Current LED Driver with Analog Brightness Control from the PowerWise? Family ICs, Interface



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