L4973V5.1

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The L4973V5.1 is a DC-DC switching regulator from STMicroelectronics that provides a variety of performance and system integration options, making it suitable for controlling multiple voltage conversion strategies in a wide range of medical, industrial and consumer systems. The device is equipped with an integrated 1.2A low-dropout linear regulator, a 5A main switch and adjustable integrated feedback loop. The L4973V5.1 is designed to allow for efficient power conversions between the input and output voltages without sacrificing system reliability. The device features high efficiency over a wide input voltage range, high regulator accuracy and stability, and protection against undervoltage lockouts, overcurrent and over-temperature.

The device includes a proprietary Advanced Adaptive On-Time (AAOT) control loop, which dynamically adjusts the turn-on and turn-off timing of the main switch to optimize efficiency and reduce ripple under varying and challenging loads. The feedback loop further optimizes the behavior of the main switch by limiting maximum and minimum duty cycles to a predefined level. This ensures the system operates within the desired parameters, allowing for optimal power conversion and reliable application operation.

The L4973V5.1 provides precision output voltage control for up to six outputs through a built-in overvoltage protection (OVP) and undervoltage lockout (UVLO) function. It supports a wide range of output voltage configurations, including single output with dropout, single output with independent supply, dual output with independent supplies, and triple output with programmable current sharing. The device also includes pre-biased startup capability, enabling it to operate within a wide range of input/output voltages with minimal standby current drain. In addition, the device includes soft start and overcurrent protection, helping to protect the load from current spikes.

The device is designed for multi-phase configurations with 2 or 4 independent outputs, each with its own control loop and can be switched at different frequencies. The on-board regulator can be set from 0.5V to 6V, with a maximum input current of 420mA. The device is equipped with a high temperature thermal shutdown feature that protects itself and the load from excessive heat and current. In addition, the device includes integrated logic level output pads, enabling the user to program soft start and over-current thresholds without needing external components.

The device comes in a wide variety of package options, including SOT23-6, DFN-6 and BGA-8. This makes it suitable for a variety of applications, such as PoE, motor control, and low-power systems. The L4973V5.1 is a highly integrated device, allowing for efficient power conversions between the input and output voltages without sacrificing system reliability. Its wide range of features, programmability and multiple output configurations make it an excellent choice for a variety of systems.

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