LM2677SX-12 Integrated Circuits (ICs)

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The LM2677SX-12 is an integrated circuit designed to provide a regulated output voltage from a varying input. It is considered part of the switching regulator family of integrated circuits (ICs), and it is also known as an adjustable switching regulator in some contexts. The LM2677SX-12 is used in an array of power management applications, including those related to telecommunications, consumer electronics, computers and other electronic products. Its most common uses involve providing a regulated output voltage from a single cell lithium ion battery, or a switching regulator capable of supplying up to 1.5A of current.

Features

The LM2677SX-12 is a monolithic switching regulator with integrated circuitry that provides constant output regardless of the input voltage or load provided, allowing it to be used in a variety of applications. This switching regulator can provide an output voltage from 0.75 V to 4.5 V depending on the application settings. It has an adjustable output voltage that can be set using an external resistor, allowing greater customization for specific applications. Other features of this IC include

• Open loop operation with voltage or current mode control
• Fixed 1.2MHz switching frequency
• Adjustable switching frequency up to 2.2MHz
• 2.25V to 5.5V input voltage range
• High efficiency operation up to 95%
• Built-in soft-start delay to improve start-up capability
• Current limit and short circuit protection that is adjustable for any load conditions
• Thermal shutdown protection

Application Field and Working Principle

The LM2677SX-12 is a high performance, low cost, switching regulator intended for use in power management applications. It is designed for use in both step-down and step-up converter applications and has features to protect against both over voltage and under voltage conditions. The most common application for this IC is in powering digital systems from a single cell lithium-ion battery. When connected to the battery, the LM2677SX-12 regulates the output voltage and reduces the number of components required to control the battery. This produces an efficient system while minimizing the space and board area needed. Moreover, this IC also functions as a low-cost DC-DC input stage, benefiting applications such as portable music players, hand-held electonic devices and cellular phones.

The LM2677SX-12 is a Buck-Boost switching regulator with an integrated dual MOSFET topology. The MOSFETs are arranged in an H-bridge configuration that works in both step-down and step-up power conversion directions. It operates in both open loop control and current limit control depending on the application. In open loop operation, the IC controls the output voltage by heavily modulating the duty cycle of the output MOSFET over a fixed switching frequency. This allows for very low-noise operation, superior efficiency and fast transient response. In current limit mode, the LM2677SX-12 works in a similar fashion, but the output voltage is limited by a feedback loop to prevent excessive voltage build up and overcurrent protection.

Conclusion

The LM2677SX-12 is a state-of-the-art switching regulator IC, especially when it comes to powering digital systems from a single cell lithium-ion battery. With its integrated circuitry and adjustable output voltage, it is perfectly suited to meet the power management needs of a variety of applications. Its low cost and efficiency make it an ideal choice for many applications, particularly those related to telecommunications, consumer electronics, computers and other electronic products.

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