L7981ATR

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Introduction

L7981ATR is a monolithic buck switching regulator designed to provide a low power, low noise solution for powering low-power processors, peripherals, and other low-power devices. It is manufactured in a very compact 8-lead SOIC/US_8 package measuring just 2 mm x 1.6mm and producing an output voltage of 3.3V. The L7981ATR has a wide input voltage range of 4V-18V, making it suitable for powering high-voltage/low-power rail systems.

Application Fields

The L7981ATR is suitable for a wide range of output currents up to 500mA, making it ideal for powering various low-power peripherals, processors, and other low-power digital devices. Typical applications include powering small LCD panels, powering computer peripherals, battery backed-up embedded processing systems, control systems, and providing power for microcontrollers.

The L7981ATR also has an integrated voltage superior noise rejection, which allows it to have a very low noise output even in noisy environments. This makes it suitable for powering audio circuits that require a low-noise supply.

Working Principle

The L7981ATR uses a standard pulse-width-modulation (PWM) technique to control the output voltage. It consists of two stages: a high-side P-channel MOSFET and a low-side N-channel MOSFET. When the output voltage drops below the programmed voltage, the P-channel MOSFET turns on, driving current into the inductor. The current in the inductor ramps up until the P-channel MOSFET is turned off, at which point the current starts to flow through the low-side N-channel MOSFET. As the current flows through the N-channel MOSFET, it is diverted back to the input voltage, thus maintaining the output voltage at the programmed value. The P-channel MOSFET is then switched on again, and the cycle repeats.

The L7981ATR also incorporates several protection features to prevent over-voltage, over-temperature, and over-current conditions. The internal temperature sensing and power limiting circuitry provide protection against overheating and over-current conditions, while the over-voltage protection circuitry is triggered by a voltage more than 3V higher than the output voltage.

Conclusion

The L7981ATR is a flexible, low power and low noise solution for powering low-power devices with a wide range of output currents. Its internal protection features make it ideal for many applications where a reliable, robust power supply is required. Its small 8-lead SOIC/US_8 package makes it suitable for space-constrained applications.

The specific data is subject to PDF, and the above content is for reference