STMicroelectronics L7987TR Step-Down Switching Regulator

The L7987TR from STMicroelectronics is a highly efficient, monolithic synchronous step-down switching regulator that is designed to deliver a continuous output current of up to 3 A to the load, depending on the application. This device operates from a wide input voltage range of 4.5 V to 61 V, making it suitable for a variety of industrial, automotive, and consumer applications where the supply voltage can vary widely.

The L7987TR features a high switching frequency that can be adjusted from 250 kHz to 1.5 MHz, allowing the use of small external components, thereby reducing the overall solution size. This frequency flexibility enables designers to strike an optimal balance between efficiency and component size.

With an internal 65 mΩ high-side switch and a 40 mΩ synchronous rectifier, the L7987TR offers reduced conduction losses and improved thermal performance. Its peak current mode architecture ensures fast transient response and easy loop stabilization. The regulator also includes an adjustable soft-start time that limits the inrush current during startup, adding an extra layer of protection for sensitive electronics.

The L7987TR comes with a host of protection features to ensure the longevity and reliability of the end application. These include overcurrent protection, thermal shutdown, and a real-time output overvoltage protection that quickly disables the high-side gate driver in case of an overvoltage condition, preventing damage to downstream components.

This regulator is available in a compact VFQFPN 16 (3x3 mm) package, which is ideal for space-constrained applications. The L7987TR also supports a power-saving mode that enhances efficiency at light loads with controlled output voltage ripple, making it an excellent choice for portable and battery-powered applications where power efficiency is critical.

Overall, the L7987TR is a robust and versatile step-down regulator that offers designers a compact, efficient, and reliable solution for a wide range of voltage regulation needs.