Buck Boost Converter Circuit without Magnetics

Introduction

A Buck Boost Converter is an electronic circuit that is used to step up or step down a voltage level. It is a widely used converter in various applications such as LED lighting, battery-operated devices, and power supplies. In this article, we’ll discuss a Buck Boost Converter Circuit without magnetics that utilizes the LTC1515 IC.

A Buck Boost Converter is a type of DC-DC converter that operates by switching an input voltage to create a pulsating DC output. The output voltage is then filtered to produce a smooth DC voltage. The basic elements of a Buck Boost Converter are an inductor, a diode, a switch, and a capacitor. These components are arranged in a specific way to achieve the desired voltage regulation.

Circuit Diagram of Buck Boost Converter Circuit

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**Buck Boost Converter Circuit without Magnetics**

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Explanation of Buck Boost Converter Circuit

One of the challenges of using a Buck Boost Converter is the requirement of a magnetic element in the circuit to provide voltage regulation. However, with the introduction of the LTC1515 IC, a Buck Boost Converter without magnetics is now possible.

The LTC1515 IC

The LTC1515 is a high-efficiency synchronous step-up DC-DC converter that is designed to operate without a magnetic element. The device uses an internal charge pump to generate high voltages from low voltages. The LTC1515 can convert voltages as low as 2.5V to as high as 28V, with an efficiency of up to 95%.

The LTC1515 operates by using a charge pump to provide a high-frequency switching signal to drive an external MOSFET switch. The charge pump generates higher voltages using capacitive coupling without the need for a magnetic element. This not only eliminates the need for a magnetic element but also leads to reduced components, size, and cost.

Buck Boost Converter Circuit

The Buck Boost Converter without magnetics using the LTC1515 IC consists of a few components. It includes an input capacitor, an output capacitor, an external MOSFET switch, and the LTC1515 IC.

The input capacitor is connected to the input voltage source, and the output capacitor is connected to the output load. The external MOSFET switch is connected to the LTC1515’s output pin, and the other side of the MOSFET switch is connected to ground. The inductor in a traditional Buck Boost Converter is replaced by the internal charge pump of the LTC1515 IC.

The LTC1515 IC’s charge pump generates a voltage that is used to switch the external MOSFET. The switch is turned on and off at a high frequency to create a pulsating DC output. The pulsating output is then filtered by the output capacitor to produce a smooth DC voltage that meets the load requirement.

Advantages of the LTC1515 Buck Boost Converter Circuit

The Buck Boost Converter without magnetics using the LTC1515 IC has several advantages. The most significant advantage is the elimination of a magnetic element in the circuit. This leads to reduced cost, size, and weight. Additionally, the converter’s efficiency and power density are improved as a result of fewer components and better thermal management.

Conclusion

The Buck Boost Converter without magnetics using the LTC1515 IC is a reliable, efficient, and low-cost solution for voltage regulation. Its ability to operate without a magnetic element makes it an attractive option for various applications, such as LED lighting, battery-operated devices, and power supplies.

In conclusion, the creation of the LTC1515 IC has allowed designers to implement a Buck Boost Converter without a magnetic element, leading to reduced component count, cost, and size while maintaining high efficiency and power density.