L7987TR

Voltage Regulators - DC DC Switching Regulators Overview

The L7987TR is a monolithic step-down switching regulator from STMicroelectronics, designed to deliver up to 3 A of DC output current. It operates with an input voltage range of 4.5 V to 61 V and supports adjustable output voltages from 0.8 V to the input voltage level. The device features an asynchronous buck topology housed in a 16-lead HTSSOP package with exposed pad (VFDFPN-EP-10 equivalent footprint). Key electrical parameters include a typical quiescent current of 1 mA and a switch-over feature on the VBIAS pin for enhanced light-load efficiency. The internal oscillator allows for adjustable switching frequencies between 250 kHz and 1.5 MHz.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Adjustable current limitation enables selection of inductor RMS current to match nominal output requirements.
• Embedded switchover feature on the VBIAS pin maximizes power conversion efficiency during light load conditions.
• Pulse-by-pulse current sensing with digital frequency foldback provides effective constant current protection under various application scenarios.
• Multiple devices can be synchronized via the SYNCH pin to prevent beating noise in low-noise applications.

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial systems requiring fail-safe specifications due to wide input voltage range and 100% duty cycle capability.
• Sensors with analog-to-digital conversion that require low-noise operation through device synchronization.
• Compact power supply designs utilizing high switching frequency capabilities to minimize external component size.

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging when ordering. Confirm the 16-HTSSOP package variant matches your PCB footprint requirements. Ensure compatibility with the 4.5 V to 61 V input range for your target application. Check for moisture sensitivity levels if storage conditions are critical. Validate that the asynchronous topology aligns with your efficiency and cost constraints.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust 3 A synchronous or asynchronous buck converter is needed for industrial environments. Consider the adjustable switching frequency range if electromagnetic interference filtering is a priority. Evaluate the VBIAS switchover feature if light-load efficiency is critical for battery-operated or variable-load systems. Compare against the L7986 series if lower input voltage ranges suffice, as the L7987 supports up to 61 V.

Voltage Regulators - DC DC Switching Regulators Part Context

The L7987TR belongs to the L7987 family of high-voltage step-down regulators manufactured by STMicroelectronics. This series is part of the broader PMIC portfolio focused on industrial and automotive-grade power management solutions. The TR suffix denotes the reel packaging format, distinguishing it from tube-packaged variants like the L7987L. It shares functional similarities with other members of the L798x family but offers specific current and voltage ratings tailored for demanding applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs before considering alternative manufacturers or pin-compatible devices from other vendors.