L7985TR

Voltage Regulators - DC DC Switching Regulators Overview

The L7985TR is a monolithic step-down switching regulator manufactured by STMicroelectronics, designed for high-efficiency DC-DC conversion. It integrates a power MOSFET capable of delivering up to 2A output current with an input voltage range spanning from 4.5V to 38V. The device features an adjustable output voltage starting from 0.6V and includes an internal oscillator with a fixed frequency of 250kHz, which can be externally programmed up to 1MHz. It operates within a junction temperature range of -40°C to 150°C and utilizes a 10-VFDFN package with an exposed pad for thermal management.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 2A current-limited embedded power MOSFET for compact step-down regulation
• Features an internal 250kHz switching frequency oscillator programmable up to 1MHz
• Supports low dropout operation with 100% duty cycle capability
• Includes internal soft-start, enable control, and comprehensive protection mechanisms

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial point-of-load regulation
• Automotive electronics power distribution
• Embedded systems requiring efficient buck conversion
• Battery-powered devices needing wide input range support

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'TR' corresponds to the tape and reel packaging configuration required for automated assembly processes. Confirm that the 10-VFDFN package dimensions align with the target PCB footprint and thermal pad requirements. Ensure compatibility with the intended operating temperature range and validate external component selections against the official datasheet specifications for stability.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a synchronous or non-synchronous buck topology is not strictly required but high efficiency and wide input voltage tolerance are necessary. It is suitable for designs where the switching frequency needs adjustment between 250kHz and 1MHz to optimize inductor size or EMI performance. Consider the exposed pad thermal solution for maintaining junction temperatures within limits under full load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the L7985 family of step-down switching regulators from STMicroelectronics. It shares functional similarities with other members like the L7981 and A7985ATR but differs in specific current ratings, automotive qualification status, and package options. The L7985 series is positioned for general-purpose industrial and commercial applications requiring robust power management solutions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The A7985ATR is an automotive-grade alternative within the same family offering similar electrical characteristics. Verify if AEC-Q100 qualification is required for the application. Other L79xx series variants may serve as substitutes if current or voltage requirements differ slightly.