L5970ADTR

Voltage Regulators - DC DC Switching Regulators Overview

The L5970ADTR is a monolithic step-down switching regulator manufactured by STMicroelectronics, designed for high-efficiency power conversion. It features an internal P-Channel D-MOS switch with a current limit of 1.5A, enabling DC output currents exceeding 1A depending on application conditions. The device operates with an input voltage range from 4.4V to 36V and provides an adjustable output voltage between 1.235V and 35V. An internally fixed switching frequency of 500kHz minimizes external component size. It includes protection mechanisms such as thermal shutdown, pulse-by-pulse current limiting, and zero current consumption via an inhibit pin.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an internal P-Channel D-MOS transistor to eliminate the need for bootstrap capacitors and ensure high efficiency.
• Provides effective constant current short circuit protection through pulse-by-pulse current limiting combined with internal frequency modulation.
• Supports low dropout operation at 100% duty cycle, allowing regulation even when the input voltage approaches the output voltage.
• Features an inhibit function that reduces current consumption to zero when the device is not in use.

Voltage Regulators - DC DC Switching Regulators Applications

• Power supplies for computer-related applications utilizing 5V bus architectures
• Point-of-load regulation in embedded systems requiring wide input voltage ranges
• Battery-powered equipment benefiting from low quiescent current modes

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging configuration distinct from tube variants. Confirm RoHS compliance status and moisture sensitivity level prior to assembly planning. Check for any recent product change notifications regarding pinout or electrical characteristics. Ensure the ordering quantity aligns with manufacturer minimums for the selected packaging type.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a buck converter topology is required with an input voltage up to 36V and output current needs around 1A. The fixed 500kHz frequency is suitable for designs prioritizing compact passive component sizes. Consider the SOIC-8 package constraints for thermal management if operating near maximum load limits. Verify that the external feedback resistor network can achieve the desired output voltage within the 1.235V to 35V range.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the L5970 series of step-down switching regulators from STMicroelectronics. It shares functional similarities with other members like the L5970D but differs in packaging and specific electrical tolerances. The series is characterized by its internal P-Channel MOSFET architecture, distinguishing it from N-channel counterparts that require charge pumps or bootstrap circuits.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes may include other STMicroelectronics buck converters with similar input ranges and current capabilities, such as the L5970D for tube packaging equivalents. Cross-reference datasheets for pin compatibility and thermal performance before substitution.