AN77L12M

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AN77L12M is a three-terminal, low-power, low-drop voltage regulator with an adjustable output voltage in the range of 1.2 V to 9 V. It is capable of providing a regulated current up to 250 mA, making it suitable for many applications. The AN77L12M has an integrated 0.3 – 2.4 ohm series pass device, which provides overcurrent protection for the load. Additionally, the device features thermal cut-off protection and a fixed temperature coefficient, making it a reliable and cost-efficient voltage regulator.

The AN77L12M is best suited to be used in applications such as handheld or portable electronics and data processing hardware, where a low quiescent current, a low dropout voltage and a low noise voltage regulator is needed. This device is also well-suited to be used in audio, video and communications applications, due to its low dropout voltage, low noise and its high input voltage tolerance.

The AN77L12M is also suitable for applications in personal computers and notebooks, since it has a wide operating temperature range from -40°C to +85°C. Additionally, the device is designed to be stable with larger output capacitors, providing superior ripple rejection at low loads.

Working Principle

The AN77L12M is a high-performance linear voltage regulator. Its output voltage is set by a resistor to the Base-Reference voltage, ensuring a steady voltage output. The input voltage is applied to the Input pin, while the output is available at the Output pin. The quiescent current drawn from the input voltage is equal to the output current multiplied by the output voltage, that is: I_Q ≈ I_out * V_out. The device is designed to operate with high input voltage, low dropout voltage and low quiescent current, making it ideal for low-power applications.

The device has an integrated resistor between the sense pin and the output pin, that helps to limit the output voltage. This means that the device will automatically shut down if the output voltage rises above a certain threshold. Additionally, the internal thermal overload protection will switch off the device in the event of excessive temperature, thus protecting the device.

Conclusion

The AN77L12M is an excellent choice for low-power, low-dropout and low-noise voltage regulator applications. The device is capable of providing an adjustable output voltage in the range of 1.2 V to 9 V and has an integrated series pass device, which provides overcurrent protection. Additionally, the AN77L12M has thermal cut-off protection and a fixed temperature coefficient, making it a reliable and cost-efficient voltage regulator solution.

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