42V Quad Monolithic Synchronous Step-Down Regulator

February 01, 2016 // By Electronics EETimes

When it comes to powering noise-sensitive analog/RF applications, low dropout (LDO) linear regulators are generally preferred over their switching counterparts. Low noise LDOs power a wide range of analog/RF designs, including frequency synthesizers (PLLs/VCOs), RF mixers and modulators, high speed and high resolution data converters (ADCs and DACs) and precision sensors. Nevertheless, these applications have reached capabilities and sensitivities that are testing the limits of conventional low noise LDOs. With its ultralow output noise and ultrahigh PSRR performance, the LT3042 can directly power some of most noise-sensitive applications while post-regulating the output of a switching converter, without requiring bulky filtering.