L5981TR

Voltage Regulators - DC DC Switching Regulators Overview

The L5981TR is a step-down switching regulator manufactured by STMicroelectronics, designed for efficient DC-DC conversion. It operates with an input voltage range of 2.9 V to 18 V and provides an adjustable output voltage from 600 mV to 18 V. The device delivers a continuous output current of 1 A and features a fixed switching frequency of 250 kHz, which can be programmed up to 1 MHz. It utilizes a VFQFPN-EP-8 package (3x3 mm) and supports operation temperatures from -40°C to +150°C junction temperature. Key electrical parameters include a maximum static current of 2.4 mA and compliance with RoHS3 standards.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 1.5 A minimum current limit embedded power MOSFET for robust load handling
• Supports zero-load current operation and low dropout performance via 100% duty cycle
• Includes internal soft-start and inhibit functions for controlled startup sequences
• Provides over-current and thermal protection mechanisms to enhance system reliability

Voltage Regulators - DC DC Switching Regulators Applications

• Battery-powered portable devices requiring efficient voltage regulation
• Industrial control systems operating within wide input voltage ranges
• Consumer electronics utilizing compact surface-mount power solutions
• Embedded systems needing programmable switching frequencies for noise optimization

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific ordering suffix and package variant against the official datasheet before procurement. Confirm moisture sensitivity level (MSL 3) and reflow soldering profile requirements to ensure component integrity during assembly. Check for any recent Product Change Notifications (PCNs) regarding assembly sites or material composition updates. Ensure compatibility with your board's thermal management design given the 150°C junction temperature rating.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a single-output buck converter with high input voltage tolerance up to 18 V is required. It is suitable for designs prioritizing compactness due to the small 3x3 mm VFQFPN package. Consider the programmable switching frequency feature if electromagnetic interference (EMI) mitigation is critical. Ensure the application does not require synchronous rectification, as this model uses a non-synchronous topology with an external Schottky diode.

Voltage Regulators - DC DC Switching Regulators Part Context

The L5981 belongs to STMicroelectronics' portfolio of monolithic DC-DC switching regulators. It is part of the L5981 series, which focuses on providing high-efficiency power conversion in small form factors. This family targets applications demanding reliable performance in industrial and consumer environments, offering integrated protections and flexible configuration options through external components.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Engineers should consult the manufacturer's official cross-reference tools or datasheets for equivalent products with similar pinouts and electrical specifications.