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National Semiconductor Corporation introduces its Model LM3553 high-current light-emitting diode (LED) driver that enables dual LED operation for the camera flash function in portable multimedia devices. It drives one or two high-current LEDs in series in handheld devices such as mobile phones, personal digital assistants (PDAs), smartphones, portable scanners and medical strobe lights. This LED driver is a fixed-frequency, step-up DC/DC converter with two regulated current sinks, driving loads up to 1.2 A from a single-cell Li-Ion battery. Using the driver’s adjustable over-voltage protection circuitry allows designers to drive two high-current LEDs in a series configuration, maximizing the illumination-to-power ratio. It can drive the camera in a high-power flash mode for still photography or a low-power torch mode for video recording.


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