μModule, Silent Switcher, and EMI Shield in One - LTM8060F

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ProductsPickup Power SuppliesAnalog Devices

Miniaturization and noise suppression are important issues in power supply design. Analog Devices' μ Module series, which contributes to miniaturization, and the Silent Switcher series, which achieves low EMI, are used by many engineers. However, some people may have felt that while μ Module is convenient and easy to use, it would be nice if there was a lineup with slightly improved noise performance.

In fact, power supply modules that combine the features of μ Module and Silent Switcher are already available. Here we introduce the power supply modules "LTM8060" and "LTM8060F", which also comes with EMI shielding.

The popular μModule product "LTM8060" with Silent Switcher

The μ Module is a proprietary solution from Analog Devices that integrates high-precision analog ICs and peripheral circuits into a single package. Its compact size, high efficiency, and high precision contribute to reducing the number of components and improving design efficiency.
For more information, click here ⇒ When it comes to FPGA power supplies, it's all about the μModule® regulator

Silent Switcher is Analog Devices' proprietary ultra-low noise DC-DC converter architecture that delivers low EMI, high efficiency, and high switching frequency without any trade-offs.
For more details, click here ⇒ How we got here: Low-noise switching regulator "Silent Switcher 3"

These two technologies are used in Analog Devices' popular power supply module, the LTM8060.

feature	merit
12A, 4 channels that can be freely assigned	Can meet various current requirements Example: 3A x 4ch, 6A x 2ch, 12A x 1ch
Input voltage: 40V	Can be used for 12V and 24V systems
Silent Switchertechnologyinside the package CISPR22 Class B Compliant with CISPR25 Class 5 Low EMI	For noise-sensitive products such as medical imaging and wireless signal processing Minimize the risk of radio interference
Wide frequency range (300kHz to 3MHz)	Can operate by targeting/avoiding the frequency bands used by users
Four selectable operation modes -Burst Mode® - Pulse skip mode - Pulse skip mode with spread spectrum -External sync mode	Selectable operating modes minimize the risk of frequency interference Improved efficiency at light loads
Parallel operation up to 24A	Current sharing possible with two LTM8060s

The LTM8060 can meet a variety of power supply requirements and offers the ease of use that only a μModule can provide, helping to save space and simplify designs.

The Silent Switcher technology is used inside the package, and it complies with CISPR22 Class B and CISPR25 Class 5. It can be used safely in devices where you want to reduce the risk of noise interference.

Application example

Due to the above characteristics, they are often used in noise-sensitive applications such as the following:

Radio System
Signal Processing Applications
Various measurement/test equipment
Medical Imaging Equipment
Industrial Applications

Introducing the LTM8060F with EMI shielding

In applications that handle minute signals, such as wireless systems and medical imaging equipment, noise from power supply ICs can affect accuracy, and developers of these applications are calling for further noise suppression.

In response to these market demands, the EMI-shielded "LTM8060F" has been released. While maintaining the high basic performance of the LTM8060, EMI shielding has been added at the package level, which has succeeded in further reducing electric field noise and magnetic field noise.

feature	merit
EMI shielding at the package level	Improved noise performance in both electric and magnetic fields
12A, 4 channels that can be freely assigned	Can meet various current requirements Example: 3A x 4ch, 6A x 2ch, 12A x 1ch
Input voltage: 40V	Can be used for 12V and 24V systems
Silent Switchertechnologyinside the package CISPR22 Class B Compliant with CISPR25 Class 5 Low EMI	For noise-sensitive products such as medical imaging and wireless signal processing Minimize the risk of radio interference
Wide frequency range (300kHz to 3MHz)	Can operate by targeting/avoiding the frequency bands used by users
Four selectable operation modes -Burst Mode® - Pulse skip mode - Pulse skip mode with spread spectrum -External sync mode	Selectable operating modes minimize the risk of frequency interference Improved efficiency at light loads
Parallel operation up to 24A	Current sharing possible with two LTM8060Fs

LTM8060F – LTM8060 with added EMI shielding for even lower noise

The LTM8060F adds conformal shielding to the LTM8060. By covering the top and sides of the package with conductive material, it is possible to effectively contain the electric and magnetic field noise radiated from the IC.

It is also ideal for applications that are susceptible to noise, as it can suppress noise interference from the power supply IC to surrounding circuits.

Compare the LTM8060 and Shielded LTM8060F Packages — Note: The LTM8060 and LTM8060F are not interchangeable due to their different footprints: the LTM8060 is BGA, the LTM8060F is LGA.

What are the benefits of package-level EMI shielding?

In the past, the most common way to suppress the effects of noise emitted by power supply ICs was to shield the entire board on which the chip is mounted with metal. However, shielding the entire board requires additional board space, which has the disadvantage of increasing weight and cost.

On the other hand, shielding at the package level requires minimal space and reduces weight and cost. By shielding only the switching regulator, which is the main source of noise, noise can be effectively reduced.

Advantages of IC-level shielding — It is also expected to be effective in reducing shielding costs and shortening the manufacturing process (mounting and clipping).

Significantly reduces magnetic and electric field noise

The following figures show the results of measuring near-field magnetic and electric field noise for the LTM8060 and LTM8060F. Near-field noise measurements are useful for identifying noise sources during the development stage. Measurements performed in inspections before product shipment measure the radiated noise of the entire board from the far field, and are not able to identify the source in detail.

LTM8060F magnetic field noise measurement results — magnetic field noise

LTM8060F electric field noise measurement results — Electric field noise

The near-field measurement graph reveals the following:

The LTM8060F suppresses magnetic field noise (between 1MHz and 1GHz) by approximately 10dB compared to the LTM8060.
The LTM8060F cuts electric field noise (between 1MHz and 1GHz) by almost 100%.

The LTM8060 is also a low-noise power module that uses Silent Switcher technology, but the LTM8060F, which adds EMI shielding at the package level, further suppresses noise. This significantly reduces the noise impact on surrounding circuits, allowing it to be used with confidence in applications with strict EMI requirements.

Suppresses switching noise radiation

The graph below shows the switching noise of the LTM8060 and LTM8060F measured using an oscilloscope.

Switching noise of the LTM8060 measured with an oscilloscope — Unshielded (LTM8060)

Switching noise of the LTM8060F measured with an oscilloscope — Shielded (LTM8060F)

With the LTM8060, switching noise radiated at a constant rate appears as a waveform. On the other hand, with the LTM8060F, no switching noise waveform is visible. This means that the EMI shielding added to the LTM8060F is containing the switching noise. These measurement results also confirm the excellent EMI characteristics of the LTM8060F.

This time, we introduced the LTM8060, which uses Silent Switcher technology, and its EMI-shielded derivative, the LTM8060F, from Analog Devices' μModule products. Both combine the compact and convenient μModule with the low-noise Silent Switcher technology, making them ideal for noise-sensitive applications. The LTM8060F, which adds EMI shielding at the package level, achieves even greater noise reduction. If you need to meet strict EMI requirements or are limited by board space, we recommend giving it a try.

Evaluation boards are available for each product, so please feel free to contact us if you are interested.