LT3045 20 V 500 mA Ultra-Low Noise LDO Regulator

Analog Devices' LT3045 is a 20 V, 500 mA low dropout (LDO) regulator. This regulator features ultra-low noise and ultra-high PSRR architecture for powering noise sensitive applications. Designed as a precision current reference followed by a high-performance voltage buffer, the LT3045 can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB.

The device supplies 500 mA at a typical 260 mV dropout voltage. Operating quiescent current is nominally 2.2 mA and drops to <1 μA in shutdown. This regulator'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 LT3045 is stable with a minimum 10 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 regulator comes in a 10- and 12-pin DFN package as well as 12-pin MOSP package. The LT3045 was designed for noise sensitive power supply applications found in instrumentation, test, and medical designs.