LM2594HVM-3.3

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The LM2594HVM-3.3 is a DC-DC switching regulator from Texas Instruments. It is a high efficiency, step-down (buck) switch mode regulator, designed to efficiently convert a higher input voltage to a lower, regulated output voltage from 2.6V to 5.5V while also providing frequency foldback protection and internal thermal limiting. Compared to linear regulators, switch mode regulators have better efficiency, as they only consume energy as needed and allow higher output currents with minimal heat dissipation. This module is a popular solution for power systems in distributed power architectures, or as an intermediate regulator to improve efficiency in applications where battery life is critical.

The product consists of an internal oscillator set by the EN/SYNC pin, which drives a high-efficiency, fixed frequency current mode PWM control block. This control block in turn drives the power stages, which are internally configured as a synchronous buck converter. The output stage incorporates both synchronous switching and an asynchronous low-side MOSFET for improved efficiency and lower component counts.

The product is also designed to reduce overall system cost by its high output current capability, as well as its low-side MOSFET used for output compensation. The product also has several integrated protection features, such as an adjustable over-current protection, under-voltage lockout (UVLO) with hysteresis, and temperature shutdown. The device allows for a wide variety of user control methods, including both open- and closed-loop control, as well as programmable output voltage slew rate.

The LM2594HVM-3.3 provides very high efficiency and is designated to handle up to 1A of output current, with a low input voltage range of 3.3V to 35V. Its low quiescent current requirements and high efficiency translate into a very low power dissipation, allowing the device to be used in Battery -operated systems. The output voltage ripple is typically <1 mVpp, and the overall quiescent current is less than 1mA, enabling the power supply to meet application’s very low quiescent current requirements.

The device is available in the surface-mount 20-pin TSSOP package. It is also available in a 5-pin SOT23 package, with a typical junction-to-case thermal resistance of 12°C/W

The LM2594HVM-3.3 is designed to provide a high level of performance in terms of line and load regulation, transient response, output temperature stability, and ripple attenuation. The product also offers a low total harmonic distortion (THD), with the output voltage being adjustable via an external resistor divider or using a logic input signal.

In conclusion, the LM2594HVM-3.3 is an efficient and reliable step down DC/DC switching regulator. Its high efficiency and low quiescent current requirements results in improved power dissipation and battery life in battery-powered applications. It provides good regulation, transient response and ripple attenuation, and the output voltage can be adjusted via an external resistor divider or by using a logic input signal. Its integrated protection features, including over-current protection and under-voltage lockout, help to ensure safe and reliable operation, and it is available in two packages for a variety of applications.

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