Linear Technology Intros LT3486 Step-Up DC-DC Converter
Linear Technology Corp. (LTC, Milpitas, CA) introduced its new LT3486, a dual step-up dc-dc converter designed to drive up to 16 white LEDs (eight LEDs in series per channel) with constant current. The LT3486's high-efficiency, current-mode, and fixed-frequency operation ensures uniform LED brightness, low noise, and maximum battery life. Its two independent converters are capable of driving asymmetric LED strings (up to eight in a series per converter) from an input voltage of 2.5 V to 24 V, delivering efficiencies up to 85 percent. The device's 5 mm x 3 mm DFN package and small externals provide a compact footprint for space-constrained, hand-held applications, while its 2.5 V to 24 V input-voltage range enables it to operate in applications from lithium-ion-powered hand-held devices to automotive backlighting applications.
The LT3486's switching frequency can be set between 200 kHz and 2 MHz via a single resistor, which enables the designer to minimize solution footprint and maximize efficiency. Since the LT3486 utilizes constant-frequency architecture, noise is minimized, eliminating potential interference with any onboard RF or audio circuitry. Additional features include internal soft-start/inrush current limiting and open LED protection.
The LT3486EDHC is available in a 5 mm x 3 mm DFN-16 package, while the LT3486EFE is housed in a TSSOP-16E package. Pricing starts at $2.50 and $2.60 for 1,000-piece quantities, respectively. Both parts are available from stock.
