L5981

Voltage Regulators - DC DC Switching Regulators Overview

The L5981 is a step-down switching regulator IC from STMicroelectronics, designed for high-efficiency power conversion. It delivers up to 1 A DC output current with an adjustable output voltage ranging from 0.6 V to 16 V. The device supports an input voltage range of 2.9 V to 18 V and features a programmable switching frequency between 250 kHz and 1 MHz. Packaged in an 8-VFQFPN (3x3 mm) format with an exposed pad, it includes internal soft-start, inhibit control, over-current protection, and thermal shutdown capabilities.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 1 A DC output current capability with low dropout operation supporting 100% duty cycle.
• Features zero-load current operation and internal soft-start for stable startup sequences.
• Includes comprehensive protection mechanisms such as over-current limiting and thermal shutdown.
• Supports flexible compensation networks allowing the use of MLCC output filters for loop stability.

Voltage Regulators - DC DC Switching Regulators Applications

• Battery-powered portable electronics requiring efficient step-down regulation
• Industrial systems utilizing 3.3 V bus architectures
• Embedded applications needing adjustable output voltages from 0.6 V to 16 V

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel configuration. Ensure the selected variant matches the required operating temperature range and moisture sensitivity level. Cross-reference the manufacturer datasheet revision history for any recent design or assembly site changes that may impact compatibility.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is needed for input voltages between 2.9 V and 18 V. Consider the 8-VFQFPN package for space-constrained designs. Evaluate the external resistor divider requirements for setting the desired output voltage within the 0.6 V to 16 V range. Confirm that the load current does not exceed the 1 A continuous rating.

Voltage Regulators - DC DC Switching Regulators Part Context

The L5981 belongs to STMicroelectronics' portfolio of monolithic buck converters and step-down switching regulators. It is part of a family designed for automotive and industrial applications, emphasizing high reliability. The device complements other PMIC solutions by offering a simple, single-output topology with minimal external component count.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The L5983 serves as a higher-current alternative within the same product family, offering 1.5 A DC output current while maintaining similar input voltage ranges and packaging options. Both devices share comparable protection features and switching frequency programmability.