Perfectly matched to high-speed IC, how much do you know about low ESL three-terminal terminals?

With the rapid development of CPUs and memories in electronic products such as smartphones, VR, and MR, the voltage stability and noise reduction of power supply ICs have become a key issue. In addition to high capacity, capacitors here also require lower ESL and microcapacitance. Technology's low ESL product - chip three-terminal capacitive filter can well meet this demand.
Compared with conventional chip multi-layer ceramic capacitors (Multi-layer Ceramic Chip Capacitor, MLCC), chip three-terminal capacitive filters (Multi-layer Ceramic Chip Filters, referred to as: MLCF) have the characteristics of high resonant frequency point and low ESL. , in high-speed circuits, it can play a more effective decoupling role.

At present, the mainstream ceramic capacitor in the market is MLCC, whose multi-layer internal electrodes are connected by two external terminal electrodes to form multiple capacitors in parallel. In circuits, capacitors play roles such as decoupling and filtering, and are indispensable basic components in electronic products.
The MLCF product of Micro Capacitor Technology has four outer terminal electrodes in its outer structure, which can greatly shorten the circulation path in the inner electrode of the circuit, and has the effect of parallel ESL. The overall ESL in high-frequency circuits is lower, thus making the components The overall impedance is lower, more suitable for high-speed signal circuits, and can act as a noise suppressor for EMI filters . In addition, MLCF also has a significant effect on saving PCB space. Among common solutions for mobile phone PMICs , one MLCF can replace multiple MLCCs, reducing the number of MLCCs used by 50-60% and saving about 40% of mounting space.

The figure below shows the idealized impedance frequency curve of MLCC. As the frequency increases, the impedance becomes lower and lower.

However, MLCC has parasitic parameters. Due to the existence of equivalent series resistance (ESR) and equivalent series inductance (ESL), the impedance frequency characteristics of the entire MLCC have undergone tremendous changes.

In the actual circuit, in the low frequency band, the capacitance in the MLCC plays a leading role, and the impedance decreases as the frequency increases; in the high frequency band, the inductance plays a leading role, and the impedance increases as the frequency increases, so the lower the ESL value, the lower the overall MLCC The impedance is lower.

Case: Comparison of the resonant frequency points and ESL of MLCF and conventional MLCC. Choose 0402's 4.7uf MLCC and 4.3uf MLCF. Both are commonly used models and have similar capacitance values. As can be seen from the graph, the resonant frequency point (SRF) of MLCC is around 5Mhz, while the resonant frequency point (SRF) of MLCF is higher, at 10Mhz. MLCF has lower ESL at high frequencies, lower impedance, and better filtering effect.

Compared with the traditional MLCC single passive component, MLCF is a new generation of chip composite components with a more complex structure, more powerful functions, finer materials, and thinner media layers. In this regard, Werong Technology conducted market research, combined with industry technology development trends, and carried out project demonstration and pre-research before officially launching the project. WeRong Technology has established a high-level project R&D team, invested strong human resources and funds, optimized and equipped design process testing hardware and software equipment and instruments . After the project team's painstaking research and continuous research, it finally completed the R&D and mass production of MLCF, providing It provides customers with excellent solutions to improve the comprehensive performance and production efficiency of electronic information terminal products. High-end and customization are important corporate strategies and service purposes of Werong Technology, and we take root in the market with in-depth customer service. Colleagues in the electronics industry are welcome to put forward their needs and discuss with Werong Technology to continue to enhance value and promote high-quality development.