Linear Technology’s LT3042 is a high-performance, low-dropout, linear regulator featuring LTC’s ultra-low-noise and ultra-high PSRR architecture for powering noise sensitive RF applications. Designed as a precision current reference followed by a high-performance voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current, and spread heat on the PCB. The device supplies 200 mA at a typical 350 mV dropout voltage. Operating quiescent current is nominally 2 mA and drops to less than 1 μA in shutdown. The LT3042’s wide output voltage range (0 V to 15 V), while maintaining unity gain operation, provides virtually constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capability, and programmable power good to indicate output voltage regulation. The LT3042 is stable with a minimum 4.7 μF ceramic output capacitor. Built-in protection includes reverse battery protection, reverse current protection, internal current limit with foldback, and thermal limit with hysteresis. The LT3042 is available in thermally enhanced 10-lead MSOP and 3 mm × 3 mm DFN packages.

Video: LT3042 Ultra-low noise, ultra-high PSRR