L7985TR

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The L7985TR integrated circuit, made by STMicroelectronics, is a DC-DC switching regulator with a very broad application field. Designed to work as a power management IC, it offers different operating modes that extend its versatility and meet the requirements of almost any application.

Application fields

The L7985TR works in different application fields and can be used for supplying domestic appliances, such as TVs, or for providing slightly regulated supply for PIC microcontrollers. Additionally, this versatile IC is ideal for constant-current applications that demand stability and accurate current regulation.

Its quiescent current of very low value makes the L7985 ideal not just for battery-powered applications, but also for AC-DC adaptors and power line modems, where it can turn off its output when the input voltage falls below the specified threshold in order to save power.

Working principle

The L7985TR operates as a voltage- or current-controlled buck converter, meaning that its input voltage is internally regulated above a given threshold, or that a predefined current is maintained by varying the output voltage. In addition, it supports pulse-skipping mode for improved efficiency at light loads.

When powered, the integrated circuit is basically in shut-down mode, and its output turns on when its EN pin voltage level reaches a specified value. At the same time, the minimum input regulation threshold and the output load regulation threshold are obtained.

The L7985TR has a high power conversion efficiency, allowing it to maximize battery life in battery-powered applications while still providing a stable output. It also contains thermal shutdown circuitry, to protect the IC from damage caused by overheating, and a number of protections such as undervoltage lockout and overcurrent protection.

In order to allow the user to adjust the reference voltage, the L7985TR has a dedicated voltage reference pin. This pin can be tied to the IC’s ground pin, or alternatively connected to a low-value resistor to achieve a voltage reference level between 1.4 and 2.4 V.

Conclusion

The L7985TR is a DC-DC switching regulator from STMicroelectronics that spans a wide range of operating modes, and is suited for a variety of applications. High efficiency, low quiescent current, thermal protection and a number of protections make this IC a reliable and versatile power management solution for battery-powered and AC-DC applications.

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