The LT3042 is a high performance low dropout linear regulator featuring Linear Technology’s low noise architecture with 0.8 µVrms and high power supply ripple rejection (PSRR) of 79 dB at 1 MHz, for powering noise sensitive applications. Designed as a precision current source followed by a high performance rail-to-rail voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current, and spread heat dissipation on the PCB. The IC additionally features programmable current limit, fast start-up capability, and programmable power good. The device is easy to use and incorporates all of the protection features one would expect in high performance regulators, including short-circuit protection, safe operating area protection, reverse battery protection, reverse current protection, and thermal shutdown with hysteresis, all in a compact DFN or MSOP package.