DC-DC microregulator for noise sensitive applications

DC-DC microregulator for noise sensitive applications

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By Nick Flaherty

Analog Devices (ADI) has introduced a dual output DC-DC μModule regulator with patented silicon, layout, and packaging for low noise designs.

The 40V LTM8080 is aimed at applications 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 front-end has a high efficiency synchronous Silent Switcher step-down regulator followed by two separate low noise, low dropout (LDO) regulators. To further suppress switching noise, the LTM8080’s packaging integrates an EMI barrier wall or shield.

The result is low noise values of <1µVRMS from 10Hz to 100kHz, 2nV/√Hz spot noise at 10kHz and 80dB power supply rejection (PSRR) at 100kHz.

Compared to discrete solutions without an EMI shield, the LTM8080 reduces output ripple voltage by up to 70% for a simplified and quiet design.

The LTM8080 has a dual 500mA or single 1A output at 0 to 8V from an input up to 40V with a voltage tracking function to minimise power loss and can be used in parallel for lower noise and higher current designs. A 100μA SET pin current has a ±1% initial accuracy.

The integrated Silent Switcher architecture minimises EMI emissions and 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.




Price Each Per 1,000





9mm x 6.25mm x 3.32mm BGA




9mm x 6.25mm x 3.32mm BGA



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