LM3671TLX-ADJ/NOPB

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LM3671TLX-ADJ/NOPB (LM3671) is an adjustable pulse width modulation (PWM) current-mode buck (step-down) dc-to-dc switching regulator. The LM3671 is available in a thermally enhanced, space-saving 8-pin ThinSOTTM package and is capable of supplying up to 3 A of output current over a wide input voltage range of 2.8 V to 26 V.

The LM3671 family offers flexibility with its adjustable output voltage capability, available in models with either fixed or adjustable pulse frequency. Their adjustable boost or 3-terminal LDO regulator function, in conjunction with the current-mode switching regulator, makes them the ideal choice for a wide range of applications.

The LM3671 has built-in safety features like over-temperature, thermal shutdown, under voltage lockout (UVLO) and current limit. The device’s low start-up current and low shutdown current also make it an attractive choice for battery powered applications.

Application Field of LM3671

The LM3671 is designed for level-shifting and boosting applications. It is suitable for a wide range of DC/DC applications, including automotive and industrial. Some typical applications include: DC-DC buck-boost converter, DC-DC rechargeable battery voltage and current monitor, mobile device power supply, automotive smart electronic systems, and cruise control systems.

Main Working Principle of LM3671

The LM3671 is a current-mode switching regulator featuring variable switching frequency, adjustable output voltage and low-ripple power conversion. The LM3671 consists of an external adjustable power oscillator, an internal PWM comparator, a current sense amplifier with hysteresis, and a power switch driver.

The power oscillator sets the switching frequency of the converter.Once the oscillator is enabled, it will keep running until the oscillator is disabled.The oscillator determines the operating frequency of the converter and the degree of pulse-width modulation (PWM) range of ON-OFF modes. The PWM comparator controls the duty cycle of the power switch via the power switch driver circuit.

The current sense amplifier senses the output current of the switched converter, and the hysteresis feature of the amplifier provides the necessary regulation. The output voltage of the LM3671 can be adjusted by varying the value of the external reference voltage.

The LM3671 also has a low current start function to minimize the start-up ripple. This feature allows the LM3671 to remain in the low current state, allowing the Power On Reset signal to be generated by the external circuit. This helps to reduce the power loss.

The LM3671 has built-in under voltage protection so that the device is always protected from over voltage, under voltage, over temperature and over current conditions. In addition, the LM3671 has several other features like shutdown, frequency jitter and gate drive.

In summary, the LM3671 creates a current-mode switching regulator using adjustable pulse-width modulation, adjustable feedback reference voltages, low current start function, built-in under voltage protection, and shut-down mode. The LM3671 is a versatile PWM current-mode dc-dc switching regulator suitable for a wide range of applications.

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