LM3671LC-1.8

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The LM3671LC-1.8 is a type of DC–DC switching regulator power management integrated circuit (PMIC), specifically a buck–boost switching regulator. A PMIC is an integrated circuit designed to support all necessary analog and digital blocks required to provide full power conversion from one form of electrical power to another. Different types of PMIC circuits exist, such as voltage regulators and DC-DC switching regulators, and the LM3671LC-1.8 is the latter. It offers selectable buck or boost outputs with a wide input voltage range and integrated current-limit and thermal shutdown protection. As a switching regulator, the LM3671LC-1.8 is ideal for applications that require fast transient response along with efficiency and flexibility.

The buck–boost transformer architecture employed in the LM3671LC-1.8 allows its operation on a wide input voltage range which includes voltages below, above or equal to the output voltage. This is especially useful in automotive systems where cold cranking voltages can vary from 3 V to 18 V. Its wide input voltage range allows for seamless operation in different voltage ranges, which benefits automotive systems.

On the output side, the LM3671LC-1.8 has a selectable output voltage in the range of 0.5 V to 18 V. It also has a low minimum output current of 100 mA. This minimum value allows the device to be used in a variety of applications, including portable systems based on smart battery technology.

As a switching regulator, the LM3671LC-1.8 is able to offer high efficiency when compared with linear regulators. This enables systems to reduce the voltage from higher voltage sources, such as automotive batteries, to more manageable levels for components requiring lower voltages. It also is able to provide fast transient response, meaning it can handle quickly changing input voltages that could cause an overload or an impedance mismatch in linear regulators.

The LM3671LC-1.8 integrates many protection features for improved system reliability. It has an integrated loop compensation and an integrated over-current protection (OCP) circuit which responds quickly to short-circuit events on the output. This helps protect systems from long-term power disturbs. It also has built-in thermal shutdown protection, which is necessary to avoid the risk of a device over-heating and operating incorrectly.

The LM3671LC-1.8 also has an adjustable slew rate output stage and an adjustable switching frequency. This makes it very suitable for applications that require different levels of noise suppression and high-frequency switching. In addition, the device operates over a wide temperature range of -40 °C to 125 °C.

In summary, the LM3671LC-1.8 is a versatile PMIC designed for the power management of lower power applications. By integrating both buck and boost regulation, wide input voltage and adjustable switching frequency and slew rate, the LM3671LC-1.8 provides flexible and reliable power conversion from higher voltages to lower voltages. It is also able to maintain system reliability through the integration of current-limit and thermal shutdown protection features, making it suitable for portable and automotive applications.

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