L6725

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L6725 is a low dropout integrated switch-mode voltage regulator that combines three distinct functions in a single 2A capable device. This type of power management integrated circuit is designed to increase the efficiency of power supply applications. It integrates three key voltage regulating functions starting with an internal single NOR gate with 1.5V maximum voltage, and a step down DC/DC regulator that can deliver up to 1.5A output current. The third integral function is a MOSFET driver, which is also integrated into the device and programmed to drive an external N-channel MOSFET that works as the main switch in a switched-mode power supply.

This type of voltage regulator is typically employed in applications such as telephone and power line systems, automotive control units, telecommunication systems and motor control systems. It is also used in micro-controllers providing a "power on reset" or power up logic. Additionally, the part can be utilized in battery-powered applications such as cell phones, digital cameras and notebook computers. Since the attached MOSFET driver can be configured to either provide incoming power, or gate off the incoming power source altogether, this makes L6725 a particularly useful tool in applications that provide power conservation. This is achieved by efficiently controlling the output of the supply.

In order to understand the working principle of the L6725, one must first understand how it integrates three separate functions in a single device and how each of these has different roles in managing power that are delivered to the application. The first function is the integrated NOR gate which is used to generate logic signals and level shifting. This along with the forward voltage drop of the device is included to ensure constant voltage regulation across varying input voltage levels. The second function of the L6725 is the step-down DC/DC regulator, in which the input voltage flows through the primary switch of the IC. The output voltage is adjusted by the regulator by controlling the duration of the “on” or “off” cycles of the primary switch. Finally, the MOSFET driver is programmed with a logic voltage level to close/open the external MOSFET as needed, which further optimizes the efficiency of the switching regulator.

Applications for L6725 power management can be found in a wide variety of systems. For example, it is used in automotive control units to guarantee high reliability. It is also used in telecommunication systems that require power stabilization. This type of IC is also beneficial in applications with high currents, such as motor control systems, as well as in low noise and small size battery powered systems, such as cellular phones, digital cameras and notebook computers. Additionally, it is able to provide a "power on reset" or power up logic in micro-controllers.

In conclusion, the L6725 is a versatile integrated voltage regulator designed to increase the efficiency of power supply applications. By combining three functions in a single device, the L6725 enables designers to reduce development time and cost through its features such as the NOR gate, step-down DC/DC regulator and MOSFET driver. Moreover, the part is ubiquitous in both high current and low noise applications, making it an ideal choice for a wide range of applications, from automotive control units to cellular phones.

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