The LTC3875 dual output current-mode synchronous step-down dc/dc controller enables the use of very low dc-resistance (DCR) power inductors by using a novel DCR sensing architecture that enhances the signal-to-noise ratio of the current sense signal. Power inductor DCR, as low as 0.2 milliOhms can be used without a sense resistor to maximize converter efficiency and increase power density. This DCR sensing technique dramatically reduces the switching jitter normally associated with low DCR sensing applications. The LTC3875 operates over an input voltage range of 4.5V to 38V and produces a fixed output voltage from 0.6V to 3.5V with ±0.5% accuracy from -40°C to +125°C. The LTC3875 is available in a 40-lead, 6 mm x 6 mm QFN package. Price starts at $3.47 each/1,000. A datasheet is available at http://cds.linear.com/docs/en/datasheet/3875f.pdf.
Linear Technology Corp.