Low noise, high PSRR uModule regulator powers noise-sensitive applications

Patented silicon, layout and packaging contribute to the low noise, dual output DC/DC uModule regulator released by Analog Devices (ADI). The LTM8080 operates from up to 40V input.

The front-end is a high efficiency synchronous Silent Switcher step-down regulator followed by two separate low noise, low dropout (LDO) regulators. The packaging integrates an EMI barrier wall or shield, designed to further suppress switching noise, explained ADI. The company said that the result is exceptional low noise values of less than 1.0 microV RMS (10Hz to 100kHz), 2nV/√Hz (10kHz) spot noise, and 80dB PSRR (100kHz). Compared to discrete solutions without an EMI shield, the LTM8080 reduces output ripple voltage by up to 70 per cent for a simplified and quiet design. 

The LTM8080 is specifically designed to power digital loads that are susceptible to switching regulator noise such as data converters, RF transmitters, FPGA I/O and clock, op amps, transceivers and medical scanners. 

The LTM8080 µModule regulator’s integrated Silent Switcher architecture enables the device to pass CISPR22 Class B and CISPR25 Class 5 without an input filter. The adjustable switching frequency (200kHz to 2MHz) and selectable operation modes minimise the risk of frequency interference for very low noise instrumentation and high speed/high precision signal chain applications.

  The LTM8080 has a dual 500mA or single 1.0A output current with output voltages of 0 to 8.0V. The design includes a voltage tracking function to minimise power loss and features a 100 microA set pin current with ± one per cent. Initial accuracy can be paralleled for lower noise and higher current. 

Two versions are available and in full production now. The LTM8080EY#PBF and the LTM8080IY#PBF are both provided in a 9.0 x 6.25 x 3.25mm BGA.


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