L6728D

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Modern electronic devices include dozens of components from different categories. As you probably know, each device needs some kind of power supply. For instance, numerous CPUs, memory modules, I/Os are prone to minor power drops or voltage fluctuations, which is known to cause potential harm. To avoid this unwanted effect, sophisticated power management systems are used.

Today, many engineers use PMICs (power management integrated circuits) that make life much easier. One of the best examples is the L6728D, a DC-DC switching controller from STMicroelectronics. Let’s take a look at this amazing device and its application field.

Application Field: The L6728D is a high-performance, feature-rich Buck-Boost converter. This chip provides an integrated solution that allows the user to create a very efficient power management system. Most of all, it can be used in concert with a mosfet or a low-side darlington transistor to step up or down the voltage output. The L6728D makes it possible to provide adjustable output voltage in a reliable way.

The L6728D is typically used in portable electronic devices such as laptops, tablets, and wearables. The chip is also compatible with medical instruments and automotive electronics.

Working Principle: The L6728D chip uses a self-oscillating control scheme, known as hysteretic control. It is capable of operating in discontinuous conduction mode (DCM) and is also suitable for universal input voltage applications. The chip operates in two distinct modes: Power Save Mode (PSM) and Burst Mode (BM). The PSM is responsible for obtaining low no load outputs below a certain level and is selected when the load current goes below a predefined value. In the BM, the device is enabled and delivers higher currents, up to the rated rating. The transition between these two modes is programmable and the chip can detect when the load current is across the pre-defined level.

Moreover, the L6728D features an Adjustable Peak Current Limit (APCL) that helps to prevent overloading when heavy loads are present. This allows the device to reduce the need for external components, such as inductors and heatsinks. Furthermore, the chip is outfitted with programmable frequency and limits the peak current to protect against overshoots or potential damages.

In terms of features and performance, the L6728D is a great solution for both entry-level and high-end applications. The chip is backed by a rich array of safety features, including an over-voltage/over-current protection, an over temperature protection, and an under-voltage lockout. Furthermore, the chip is capable of working with a wide variety of input voltages, ranging from 4.5V to 28V.

Conclusion: As you can see, the L6728D is a high-performance DC-DC switching controller, designed for use in demanding applications. The device features a wide range of features and is outfitted with safety measures and protection circuits. The chip provides a reliable way to handle the power needs of various portable electronic devices, such as laptops, tablets, and wearables.

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