LM2673SX-3.3 Integrated Circuits (ICs)

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The LM2673SX-3.3 is a monolithic integrated DC/DC switching regulator suitable for systems where a low supply voltage (<3.3V) is required. It has the unique ability to provide this low voltage output from input sources up to 18V. It can also be used for continuous buck operation up to 36V so it is usable for both low and high power requirements.

The LM2673SX-3.3 is part of the popular and versatile LM2673 family of switching regulators. It is designed as a switching regulator in both its current modulated and pulse-width modulation (PWM) modes of operation. The device combines a high power MOSFET switch, internal loop compensation circuitry, and over current protection circuitry into a comprehensive switching solution.

The LM2673SX-3.3 can be used in several different applications. It can be used as a standalone switching regulator or as part of a larger power supply system. It can also be used in an online buck regulator configuration whereby it can be used to supply a low voltage load from a higher voltage source, achieving step-down output. Additionally, it can be used in a synchronous buck topology, meaning that it can be used to supply a low voltage load from a higher voltage source, achieving stepdown and step-up output.

The LM2673SX-3.3 has a very simple power architecture that requires minimal external components. It consists of a high-side MOSFET switch, an external control loop integrating error amplifier and feedback resistor, an internal over-load protection circuit and an output smoothing capacitor. The high side MOSFET switch enables both buck and synchronous buck converter configurations. The on-chip error amplifier and external feedback resistor set the output voltage via the internal control loop, while the internal current limit circuit (OCP) protects the device from overload or short circuit conditions.

The LM2673SX-3.3 has a wide input voltage range of 2.5V to 18V, output voltages as low as 0.8V and output current up to 2A. It is rated for high power efficiency (up to 90%) and has a ripple rejection of over 80dB. The device also offers a wide range of features, such as current limit and thermal shutdown for fault protection, soft-start for inrush current control, an enable pin for power saving modes, and an adjustable switching frequency for configuring the design.

In conclusion, the LM2673SX-3.3 is a very versatile switching regulator designed to provide a low-voltage output from a high-voltage input. It is engineered to deliver high power conversion efficiency and provides a comprehensive suite of features such as over-load protection, soft-start, and adjustable switching frequency. The LM2673SX-3.3 is an ideal choice for systems where a low voltage (<3.3V) is required.

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