NCP81118MNTWG

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The NCP81118MNTWG is a member of ON Semiconductor’s family of DC-DC switching controllers, specifically tailored for low-noise and current-mode applications. This device is an all-in-one solution that integrates a variety of advanced and flexible features, including power-good capabilities, into a small package.

The NCP81118MNTWG is capable of driving N- and P-channel MOSFETs and is applicable to applications requiring up to 20V output voltage. Available in SOIC, SOP-8L, SOT-23-5L and USP-10 packages, this device allows designers to take advantage of its capabilities without having to pay extra for packages that are not required. Additionally, ON Semiconductor offers the NCP81118MNTWG in temperature grades of -40°C to +125°C and -30°C to +85°C.

The NCP81118MNTWG offers a variety of output voltage formats selectable via a pin, including 3.3V, 5V, 8V, 12V and 18V. In addition, the device also offers a low-voltage lockout capability and integrated soft-start. This allows the device to operate from a low-noise, current-mode architecture with a wide range of the value of duty cycle between 0% and 100% for each switching cycle.

Using a current-mode control architecture, the NCP81118MNTWG is able to optimize its feedback loop by responding quickly to load and line changes. This also allows it to make consistent current-limit corrections while providing a fast, accurate response to load changes without sacrificing linear conversion accuracy. Additionally, the integrated soft-start allows the device to start up quickly, making it suitable for applications with high-power loads.

In terms of power-good features, the NCP81118MNTWG offers an adjustable maximum power-up time of up to 5ms, which is used to ensure that the output voltage remains within the specified limits while starting up. Additionally, the device is equipped with a power-good circuit that monitors the output voltage and provides an active-high or active-low signal to indicate whether the output voltage is within the specified levels or not. This circuit also includes a glitch filter to suppress noise and false indications.

In terms of thermal performance, the NCP81118MNTWG offers a thermal protection feature that prevents the device from entering an over-temperature condition, thus protecting the integrity of the application and reducing the risk of device malfunctions. This is accomplished by monitoring the die temperature and automatically shutting down the device when the specified temperature threshold is exceeded. The feature can be enabled or disabled via an internal pin, allowing designers to choose the desired operating temperature range for the application.

In terms of EMI performance, the NCP81118MNTWG uses a noise reduction technique called spread-spectrum clocking. Spread spectrum clocking reduces high-frequency noise generated by the switch and output voltage rail by spreading its frequency components over a large frequency band. This allows the device to operate with reduced noise levels, ensuring both EMI compliance and low-noise operation.

Overall, the NCP81118MNTWG is an ideal solution for automotive, consumer, and industrial applications that require low-noise, current-mode control with integrated power-good features and thermal protection. Its advanced features and low-cost packages make it an attractive alternative to other DC-DC switching controllers.

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