LM2678T-12

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The LM2678T-12 is a high-performance, monolithic synchronous step-down DC/DC switching regulator. It is a member of National Semiconductor\'s high-efficiency, low-cost Easy-To-Use (TLE) series of power management products. The LM2678T-12 is optimized to provide a very small, cost-effective solution for space-constrained applications. It has a wide input voltage range of up to 40V and a wide output voltage range of 3.3V to 12V. The LM2678T-12 can be used in a wide range of applications, such as portable and battery powered equipment, LED drivers, motor controllers, DC/DC converters for automotive applications, or as an efficient current source in a 3.3V or 5V system.

The LM2678T-12 provides several features to make system integration easier: support for a wide input voltage range of up to 40V, adjustable output voltage ranging from 3.3V to 12V, current-mode PWM control, low quiescent current, EN pin for active low enable, over-current protection, over-voltage and under-voltage protection, and thermal shutdown. It also features a frequency jittering circuit to reduce EMI, as well as an external shutdown feature which allows the regulator to be controlled over an external control line.

The LM2678T-12 has a simple operating principle. The input voltage is first routed to the feedback loop, where it is compared to an internal reference voltage. An error signal is then generated and sent to the current-mode PWM control circuit. This circuit then adjusts the switching regulator to maintain a constant output voltage, regardless of the input voltage and load current. The switching regulator is designed to maintain the desired output voltage while drawing the minimum possible quiescent current. Additionally, the LM2678T-12 features a wide operating temperature range from -40°C to +85°C.

The LM2678T-12 is a versatile DC/DC switching regulator, allowing for a wide range of applications. It can be used in automotive and industrial applications, as well as applications requiring a low-cost and efficient design. Additionally, its low quiescent current and wide operating temperature range make it an ideal choice for battery-powered devices or applications sensitive to power consumption and temperature. The LM2678T-12 is an excellent choice for those who need a small and efficient DC/DC switching regulator.

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