The LT3042 is a high performance low dropout linear
regulator featuring LTC’s ultralow noise and ultrahigh 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 200mA at a typical 350mV dropout
voltage. Operating quiescent current is nominally 2mA
and drops to <<1μA in shutdown. The LT3042’s wide
output voltage range (0V to 15V) while maintaining unitygain 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 4.7μF 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 3mm × 3mm DFN packages.
