L7981ATR

Voltage Regulators - DC DC Switching Regulators Overview

The L7981ATR is a step-down switching regulator from STMicroelectronics featuring an embedded Power MOSFET with a minimum current limit of 3.7 A, delivering up to 3 A DC output current. It operates with an input voltage range of 4.5 V to 28 V and provides an adjustable output voltage from 0.6 V to VIN. The device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz. It supports low dropout operation at 100% duty cycle, zero load current operation, and incorporates internal soft-start and enable functions.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Embedded power MOSFET with overcurrent and thermal protection
• Programmable switching frequency up to 1 MHz
• Low dropout operation with 100% duty cycle capability
• Internal soft-start and enable control

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial point-of-load regulation
• Automotive electronics power distribution
• Consumer appliance power supplies
• General DC-DC buck conversion systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'ATR' against the manufacturer's official datasheet to confirm tape and reel packaging details and RoHS compliance status. Ensure the component grade matches industrial requirements. Cross-reference the package type, typically VFQFPN or HSOP, with your PCB footprint specifications before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this regulator for applications requiring high efficiency in compact spaces due to its integrated MOSFET design. Consider the programmable switching frequency feature if EMI constraints require frequencies outside the standard 250 kHz setting. Evaluate thermal performance based on the chosen package option, as exposed pad designs significantly reduce thermal resistance for higher current loads.

Voltage Regulators - DC DC Switching Regulators Part Context

The L7981 belongs to STMicroelectronics' portfolio of monolithic DC-DC switching regulators designed for robust power management. It is part of a broader family of buck converters offering various input voltage capabilities and output currents. This series targets industrial and automotive markets with features emphasizing reliability, compactness, and comprehensive protection mechanisms.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Consult official substitution lists for compatible devices within the same product family. Verify pin compatibility and electrical parameter alignment when considering alternative part numbers.