Texas Instruments recently introduced a 2.2-MHz, dual-channel synchronous DC-DC buck converter designed to significantly reduce electromagnetic interference (EMI) and high-frequency noise.
While primarily designed for the automotive market, EMI reduction is especially important when attempting to integrate sensitive telephone modem or other wireless devices into your product, as the normal broadband noise generated by normal DC-DC converters can contaminate the receiver, causing loss of sensitivity. Applications would include wireless, automotive infotainment and high-end cluster power-supply systems.
The LM5140-Q1 key features and benefits include its wide 3.8-V to 65-V operating range handles start-stop and load-dump conditions for 12-V/24-V lead-acid and emerging 48-V Lithium-ion automotive batteries; the 2.2-MHz operation with external synchronization capability that moves switching noise above the sensitive AM band, eliminating the need for frequency hopping; the unique, adjustable gate-drive slew-rate control that reduces EMI emissions by up to 10 dB with less than a 1 percent reduction in efficiency; and its low 35-uA quiescent current (IQ) in standby (one channel operating with no load) that extends battery life in “always on” applications.
