L7980TR

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The L7980TR is a monolithic integrated circuit designed and manufactured by STMicroelectronics, designed to provide high-frequency low-voltage DC/DC convector step-up converter with low standby current and low power dissipation. It is one of the most popular DC/DC switching regulators and can be used in many applications due to its excellent features.

The core of the L7980TR is a Pulse Width Modulation (PWM) oscillator, which generates a PWM signal for controlling the power switch. It is able to maintain a constant output voltage independent from the input voltage, input current, and load current. The device further features additional protections, like thermal protection and short-circuit protection.

The L7980TR is designed to be an ideal solution for the supply and conditioning of small, low power systems such as TiVo, set-top boxes, modems, routers, etc. It is particularly suited for applications that require high efficiency, low power dissipation and high requirements on noise performance, such as portable communication and multimedia systems. The device can also be used in mobile phones and other battery powered applications.

The L7980TR is designed to control a power switch which toggles between the input and output voltages, i.e. between the supply voltage and the regulated output voltage. The PWM oscillator frequency and duty cycle determine the ratio between the input and the output voltage, with higher duty cycle resulting in higher output voltage. The duty cycle might be adjusted by an external resistor.

The L7980TR has built-in functions that provide output overvoltage protection and thermal shutdown. The device further features an additional protection which turns off the power switch in case of an output short circuit. This eliminates the need for external circuit protection and ensures reliable operation.

The L7980TR is a highly integrated device for high-frequency step-up DC/DC converters. It offers improved power conversion efficiency, optimized EMI performance and reduced design complexity at the same time. By combining all the regulator and control circuit into a single integrated circuit, the L7980TR guarantees fast response and improved system performance. The L7980TR is available in small surface mount packages, making it suitable for even the most compact designs.

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