AN79L09M

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Introduction

The AN79L09M is a 3-terminal linear voltage regulator designed to provide a precision 2.5V output voltage. It is designed to provide a high performance, low-noise regulation with up to 0.8A of output current at up to 9V of input voltage, while maintaining low ripple and low EMI. The AN79L09M is designed to provide excellent linear voltage regulation and a low dropout voltage, making it ideal for applications where the supply voltage is subject to fluctuation.

AN79L09M Application Field

The AN79L09M is ideally suited for a wide range of applications, including, but not limited to, microprocessor core and I/O supply regulation, DSP, military and telecom equipment, point-of-load regulation, power supply for portable devices, embedded systems and more. The AN79L09M is an ideal replacement for older generation regulators, as it offers improved performance, improved EMI performance and lower power consumption.

AN79L09M Working Principle

The AN79L09M is a 3-terminal linear regulator, which works by regulating the output voltage by bypassing a portion of the input voltage around a sense resistor and reference voltage (Vref) to set the output voltage. The advantage of the linear regulator is that the power dissipation is minimized by keeping the power consumption low. The output voltage can be adjusted by changing the value of the sense resistor, or by setting the value of the reference voltage with an external resistor divider, meaning that the output voltage can be adjusted to precise levels and not vary by more than 0.2%.

The AN79L09M features Low Dropout (LDO) mode, which means that the input voltage must be greater than the output voltage plus the dropout voltage. In LDO mode, the regulator is able to keep the output voltage regulated even when the input voltage is close to the output voltage, making it suitable for applications where the input voltage can vary widely. The dropout voltage of the AN79L09M is typically 0.2V, making it very efficient.

The AN79L09M also offers Enhanced Load Current (ELC) mode. In this mode, the output voltage remains regulated even when the load current increases beyond the specified output current. This makes the AN79L09M suitable for applications with large peak current demands, such as portable devices. ELC mode can also be enabled by setting the ELC enable pin to high.

The AN79L09M also features Over Temperature (OT) protection, which protects the regulator from operating with an elevated junction temperature. The OT pin can be used to disable the regulator if the junction temperature exceeds a certain limit, ensuring protection of the device and the application.

Conclusion

The AN79L09m is a versatile 3-terminal linear voltage regulator designed to provide a precise output voltage with low noise and EMI, while offering excellent linear voltage regulation, low dropout voltage and efficient operation. It is designed to be used in a wide range of applications, ranging from microprocessor core and I/O supply regulation, DSPs, military and telecom equipment, portable devices, embedded systems and more. The AN79L09M offers enhanced load current (ELC) mode, allowing it to provide a regulated voltage even with large peak current demands, as well as over temperature (OT) protection to guard against operating with an elevated junction temperature. All this combines to make the AN79L09M an ideal choice for a wide range of applications.

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