LM3671MF-1.875/NOPB Integrated Circuits (ICs)

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The LM3671MF-1.875/NOPB is a DC/DC switching voltage regulator, designed specifically for optimum performance in mobile and telecom applications. It operates as a voltage mode step-down converter with either 1.2 A or 0.8 A peak outputs. The chip can also be combined with pass transistors, such as the LM2904, to produce 2 A, or even higher levels, of voltage regulation. This makes it a useful choice for many applications, such as computing, consumer electronics and industrial control.

The LM3671MF-1.875/NOPB is an adjustable voltage regulator with 1.875 V reference voltage. It features on-chip power MOSFETs to provide up to 1.25 A continuous output current, and the LM3621MF-1.875/NOPB version is designed to deliver up to 0.8 A continuous output current. Both versions incorporate synchronous rectification to increase efficiency and reduce power dissipation.

The LM3671MF-1.875/NOPB features an internal voltage reference and over-voltage/over-current protection. It is also capable of operating in a quasi-normal mode, for applications where the input voltage is greater than the output voltage. The device is available in the 8-pin MSOP-8 package and is rated for operation from 0° C to 125° C.

The LM3671MF-1.875/NOPB operates by regulating the current through an internal MOSFET, to maintain a constant output voltage. This is achieved by comparing the output voltage to the reference voltage, using an internal regulat or. When the output voltage rises above the reference voltage, the regulator reduces the MOSFET current, attempting to return the output voltage to the set reference voltage. Conversely, when the output voltage is below the reference voltage, the regulator increases the MOSFET current, again attempting to return the output voltage to the set reference voltage.

The MOSFET current is controlled by a self-oscillating converter. The regulator sends a pulse width modulated signal to the MOSFET, which charges an internal current source. This current source regulates the MOSFET current, while the PWM signal operates as a current control signal. The combination of these two mechanisms allows the regulator to achieve its output voltage regulation.

The LM3671MF-1.875/NOPB also includes on-chip built-in over-voltage/over-current protection. This protection is triggered when the output voltage exceeds the reference voltage by a programmed amount, or when the output current exceeds a pre-programmed limit. The protection circuitry is adjustable, providing flexible protection for various applications.

Overall, the LM3671MF-1.875/NOPB is a versatile voltage regulator, designed to be used in mobile and telecom applications. It can provide up to 1.2 A (or 0.8 A) of continuous output current, while its built-in over-voltage/over-current protection ensures reliable and safe operation.

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