L7983PUR

Voltage Regulators - DC DC Switching Regulators Overview

The L7983PUR is a synchronous step-down switching regulator from STMicroelectronics, housed in a 10-WFDFN package. It delivers up to 300 mA DC output current with an adjustable voltage range from 0.85 V to VIN. The device supports a wide input voltage range of 3.5 V to 60 V and features a programmable switching frequency between 200 kHz and 2.2 MHz. It includes dynamic Low Consumption Mode (LCM) and Low Noise Mode (LNM), internal soft-start, and synchronization capabilities.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Supports dynamic transition between Low Consumption Mode for light-load efficiency and Low Noise Mode for constant switching frequency.
• Features peak current mode architecture with pulse-by-pulse current sensing for effective protection.
• Includes internal compensation network and open-collector reset output for simplified design and sequencing.

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial bus standards including 12 V, 24 V, and 48 V systems
• Digital loads such as microcontrollers and FPGAs requiring voltage sequencing
• Compact power supply designs utilizing high switching frequency

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'PUR' indicates the adjustable output variant rather than fixed voltage versions like PU33R or PU50R. Confirm the 10-WFDFN package dimensions match the PCB footprint requirements. Ensure the application circuit utilizes external components compatible with the 0.85 V to VIN adjustment range and the selected switching frequency settings.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when an adjustable output voltage is required within the 0.85 V to VIN range. It is suitable for applications needing a wide input voltage capability up to 60 V. Consider the dynamic mode selection if the system requires both high efficiency at light loads and low noise during operation. Verify that the 300 mA output current meets the load requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

The L7983PUR belongs to the L7983 family of synchronous buck regulators. It shares core architectural features with fixed-output variants like the L7983PU33R and L7983PU50R but offers voltage adjustability. Evaluation boards such as the STEVAL-L7983ADJ are available for testing this specific adjustable configuration.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other L7983 family members with different fixed outputs, such as L7983PU33R or L7983PU50R, if a fixed voltage is acceptable. Cross-family replacements require matching input voltage, current, and package specifications.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the adjustable output voltage range for the L7983PUR?

The output voltage can be adjusted from 0.85 V up to the input voltage (VIN).

Does the L7983PUR support synchronization to an external clock?

Yes, the device allows synchronization to an external clock via the LNM/LCM pin.