LM3677TLX-1.2/NOPB

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The LM3677TLX-1.2/NOPB is a DC/DC switching regulator from Texas Instruments’ family of voltage regulators. It belongs to the category of PMIC (Power Management Integrated Circuit) and is optimally suited to a variety of applications requiring stable DC power.

Application Field

The LM3677TLX-1.2/NOPB is specifically designed to provide efficient, reliable and cost-effective DC/DC switching regulation with either active-low or active-high shutdown features. This makes it well-suited to applications such as handheld wireless devices, portable medical devices, industrial equipment, and computing and consumer platforms, among others. Furthermore, it is also suitable for automotive applications due to its low standby current and wide voltage operation.

Its high input voltage range (4V-36V) and low switch-on resistance (RDS(on)) make it suitable for applications such as switchers for LED drivers, automotive accessories, mobile equipment and other applications requiring low dropout, low on-state resistance. The LM3677TLX-1.2/NOPB is offered in a compact and thermally efficient 5-lead PowerPAK SO-8 package with integrated ESD protection. It also features a wide input voltage range (4 V-36 V) and low switch-on resistance (RDS(on)).

Working Principle

The LM3677TLX-1.2/NOPB is a Pulse Width Modulation (PWM) DC/DC switching regulator. This means that it turns the input voltage into a PWM waveform for output regulation. The regulator is built around an oscillator and a power switch which is used to regulate the output voltage. When the output voltage of a buck regulator is set higher than the input voltage, the regulator is said to be operating in reverse. The buck regulator runs in pulse-width modulation (PWM) by constantly switching the power switch so that a certain amount of power is transferred to the load. This on/off switching of the power switch is regulated by the controller so that it is in compliance with the required output voltage.

The LM3677TLX-1.2/NOPB is equipped with a Power Good Output (PGB output) open-drain feature which provides a logic low output when the regulated output voltage is in regulation. The controller is also equipped with a safety function which limits the maximum current and prevents the power switch from being continuously turned on for extended periods of time. Lastly, the integrated protection circuitry also provides short-circuit protection, overvoltage protection, and thermal protection.

In summary, the LM3677TLX-1.2/NOPB is a cost-effective, space-saving, and thermally efficient DC/DC switching voltage regulator from the family of PMICs from Texas Instruments, designed for a wide range of mobile, automotive, and industrial applications requiring stable DC power.

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