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Benefits of Ceramic Capacitors as Bootstrap Capacitors

1.10.2025
Reading Time: 3 mins read
A A

This article based on Knowles Precision Devices blog discusses bootsrap capacitors its function and benefits of using ceramic capacitors.

Power electronics play a critical role in converting and managing electrical energy efficiently. As electric vehicles (EVs), renewable energy systems, and consumer electronics quickly become more powerful, the demand for high-voltage power electronics is quickly increasing.

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This means the importance of components like bootstrap capacitors has grown significantly.

In power electronics, a bootstrap capacitor is a specific type of capacitor used to drive high-side MOSFETs efficiently.

The bootstrap capacitor plays a critical role in maintaining the gate voltage required to turn on the high-side MOSFET in a half-bridge or full-bridge configuration. By using the charge stored in the bootstrap capacitor, the high-side MOSFET’s gate voltage can be boosted above the supply voltage, ensuring proper switching operation and enabling efficient power conversion (Figure 1).

Figure 1. A representation of the discharge path of the bootstrap capacitor. Source. 

How MLCCs Fill the Role of the Bootstrap Capacitor 

Now that it’s clear the role a bootstrap capacitor plays in a circuit, let’s look at how multilayer ceramic capacitors (MLCCs) can fulfill the bootstrap capacitor role and help you design more efficient and reliable power circuits. Since MLCCs are compact and have high capacitance and low equivalent series resistance (ESR), these components are generally well-suited for using as bootstrap capacitors.

Integrating MLCCs in the capacitor role within bootstrap circuits can improve system performance, reduce the PCB space required, and enhance overall energy efficiency.

Using an MLCC as a bootstrap capacitor brings the following additional benefits for your power electronics applications: 

  • Reliability: MLCCs have low failure rates and stable performance over extended operating periods, enhancing the longevity of power electronics systems.
  • Compact Form Factor: The small footprint of MLCCs allows for space-saving designs, making them ideal for modern, miniaturized power electronics applications.
  • Temperature Stability: MLCCs maintain their capacitance and performance across a wide range of operating temperatures, ensuring consistent functionality in diverse environments.
  • Wide Voltage Range: MLCCs are available in a wide range of voltage ratings, providing flexibility in design for various power electronics systems.
  • Low ESR: The low ESR of MLCCs ensures minimal power loss during switching, contributing to higher overall efficiency in power electronics circuits.

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Source: Knowles Precision Devices

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a Schematic diagram of the BNT-based components constructed based on the entropy-increase strategy. b Digital photograph, cross-sectional SEM image, and EDS mappings of the MLCCs. c Unipolar P-E loops of MLCCs as a function of applied E. d Wrec and η of the MLCCs as a function of applied E. The comparison of (e) Wrec and η, (f) η and UF of the MLCCs with those of other recently reported state-of-the-art MLCCs. source: Nature Communications

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