Ultra-low noise, ultra-high PSRR DC/DC regulator

Ultra-low noise, ultra-high PSRR DC/DC regulator

New Products |
By Jean-Pierre Joosting

Analog Devices has introduced the LTM8080 super low noise dual output DC/DC μModule regulator with patented silicon, layout, and packaging innovations. Operating from up to 40-V input, the μModule’s front-end is 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 μModule’s packaging integrates an EMI barrier wall or shield. The result is exceptional low noise values of <1 µVRMS (10 Hz to 100 kHz), 2 nV/√Hz (10 kHz) spot noise, and 80 dB PSRR (100 kHz). Compared to discrete offerings without an EMI shield, the LTM8080 reduces output ripple voltage by up to 70% 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 minimises EMI emissions and enables the device to pass CISPR22 Class B and CISPR25 Class 5 without an input filter. The adjustable switching frequency (200 kHz to 2 MHz) and selectable operation modes minimise the risk of frequency interference for very low noise instrumentation and high speed/high precision signal chain applications.

Additional features of the LTM8080 µModule regulator include:

  1. Dual 500-mA or single 1-A output current.
  2. Output voltages from 0 V to 8 V.
  3. Voltage tracking function to minimise power loss.
  4. 100 μA SET pin current with ±1% initial accuracy.
  5. Parallelable for lower noise and higher current.

Silent Switcher noise-cancelling technology improves EMI performance in many noise-sensitive applications and increases system performance in efficiency, output ripple, and total size. Silent Switcher regulators provide new levels of performance with the combination of high efficiency (up to 96%) and low noise performance, without compromising on size or requiring excessive external components. The Silent Switcher architecture uses proprietary design and packaging techniques to maximize regulator efficiency at very high frequencies and enable ultralow EMI performance, easily passing the CISPR 25 Class 5 peak EMI limits by using highly compact and robust designs.

The architecture supports input voltages as high as 65 V, load currents up to 30 A, and high step-down ratios due to low minimum on times. Typical applications include industrial, instrumentation and measurement, healthcare, aerospace, communications, automotive, energy, data center, and more.


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