NCP81103MNTXG

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NCP81103MNTXG switches up to four synchronous DC/DC buck converters. It includes adjustable current-limiting and can be configured to enable two buck converters in parallel. NCP81103MNTXG is intended for minimal external component count or fast transient response systems where the output power requirements are one or two converters operating in parallel. The switching frequency is determined internally with an 8-bit resolution.

The NCP81103MNTXG is a DC/DC switching controller that operates as a buck-boost controller. It contains two independent buck-boosts (inner-switch and outer-switch) that can be controlled and operated independently. The WDFN24L-7 package has six pins and small foot-print. It provides a high-current input and output, low-side driver, FET over-current protection, and an internal oscillator. The adaptive correct operating frequency can be determined in real time by using the output-voltage and output-current feedback.

The NCP81103MNTXG application field includes portable products as well as achieving high efficiency over a wide input voltage range for automotive and industrial applications. It can provide integration of the majority of features for buck-boost converters within itself that can be used to significantly reduce external components. These include the following: precise threshold voltage control, current limit, thermal shutdown, and operating temperature range of -40℃ to +125℃.

The working principle involves applying a voltage across the two terminals of a buck-boost controller, which generates a voltage drop across the inductor/resistor inductor (RL mode) or inductor/capacitor (LC mode) network. This voltage drop is then rectified or “buck”, and then an output voltage is applied across the terminals again. This voltage drop will induce a current flow in the inductor winding, which is then further rectified. Finally, the current is applied to the load. In this way, the current flow fluctuations are continuously observed and controlled. A voltage regulator is used to maintain the output voltage at the desired level.

In the NCP81103MNTXG, the current-limiting and switching frequency are determined internally. The circuit includes two internal voltage regulators and a flexible clock-management circuitry. The voltage regulators\' outputs are connected to the switching drivers which gates the MOSFETs. In addition, the clock-management circuitry can also be programmed. This helps to reduce the number of external components required.

The NCP81103MNTXG features easy integration and is designed for easy use in applications requiring low power consumption and low external component design. The circuit can be configured for linear or pulsed current-limiting. The current-limiting feature can be programmed to up to 6 different levels, offering excellent versatility. It also has a wide operating temperature range, from -40℃ to +125℃, which makes it suited for many applications.

In conclusion, NCP81103MNTXG is a DC/DC switching controller intended for minimal external component count or fast transient response systems where output power requirements are one or two converters operating in parallel. It includes adjustable current-limiting, wide operating temperature range and robust current regulation. Its application field includes portable products as well as achieving high efficiency over a wide input voltage range for automotive and industrial applications.

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