L7981TR

Voltage Regulators - DC DC Switching Regulators Overview

The L7981TR is a synchronous step-down switching regulator from STMicroelectronics, housed in an 8-pin VFQFPN package. It operates with an input voltage range of 4.5 V to 28 V and delivers up to 3 A of output current. The adjustable output voltage spans from 0.6 V to the input voltage level. The device features a fixed internal switching frequency of 250 kHz, which can be programmed externally up to 1 MHz. It includes an embedded power MOSFET with a minimum current limit of 3.7 A. The component supports an operating temperature range from -40 °C to +150 °C and utilizes tape and reel packaging for surface mount installation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 3.7 A current-limited embedded Power MOSFET for high-efficiency power conversion
• Supports low dropout operation with 100% duty cycle capability for minimal voltage drop
• Includes internal soft-start and enable functions to manage inrush current and system sequencing
• Provides comprehensive protection against overcurrent conditions and excessive thermal stress

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial point-of-load power regulation
• Automotive electronic subsystem power supplies
• Embedded systems requiring compact DC-DC conversion
• Consumer electronics with strict space constraints

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific ordering suffix to confirm the exact package variant and tape/reel specifications required for your assembly line. Confirm that the RoHS compliance status matches your environmental regulations. Ensure the industrial grade temperature rating aligns with your operational environment requirements before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a wide input voltage range up to 28 V is required alongside high output current capabilities. Consider the programmable switching frequency feature if electromagnetic interference filtering needs optimization. Evaluate the thermal performance of the exposed pad packages against your PCB layout constraints to ensure adequate heat dissipation during continuous operation.

Voltage Regulators - DC DC Switching Regulators Part Context

The L7981 belongs to STMicroelectronics' portfolio of monolithic buck converters designed for robust power management. It complements other regulators like the L6981 and L7983 within evaluation platforms such as the STEVAL-QUADV01. This series targets applications demanding high reliability, compact form factors, and integrated protection features for both industrial and automotive environments.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing design-in alternatives by comparing electrical parameters and pin configurations carefully.