AN77L09M

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AN77L09M Application Field and Working Principle

AN77L09M is a high-performance linear voltage regulator IC from STMicroelectronics. It belongs to the PMIC (Power Management IC) family and can be categorized under Voltage Regulators – Linear. This device combines the protection, voltage accuracy and load transient performance of an advanced switching regulator with the low cost and ease of use of a linear regulator. It regulates the output voltage over a wide range of input voltage ranges and can be used in a variety of applications.

An77L09M is available in an 8-lead SOIC (Small Outline IC) package with an exposed substrate. This package comes with a thermal pad allowing for efficient heat transfer and allowing the device to operate at high efficiency. The device requires just 1 external resistor and offers other features like input voltage protection, output voltage brownout protection and foldback current limit.

AN77L09M offers a wide range of features, including an adjustable output voltage (1.8V to 8.5V nominally) with a tolerance of ±2% at room temperature. The device offers guaranteed output current of up to 1A and can output only 500mA of continuous current when set at the highest potential. The operating temperature range is from -40°C to + 85°C.

In addition, it has an internal power-on reset protection circuit for preventing power surges and spikes, an over-voltage protection and an external-circuitry controlled shutdown function. The power-dissipation of this chip is the same as of an ideal diode-connected regulator.

The working of the AN77L09M is based on the “output voltage regulation principle”. The device dynamically adjusts the output voltage (Vout) as a response to the changes in the load current and input voltage by using a single error amplifier. This maintains the output voltage in tight tolerance regardless of variations in the input line, temperature, and load current.

The dynamic regulation of the output voltage relies on two basic components: a non-inverting amplifier, which is the error amplifier, and an output transistor switch. The error amplifier is used to sense the difference between the output voltage and the reference voltage and adjusts the switch duty cycle so that the current flow from input to output always gives the same Vout.

The AN77L09M also has several protection features. It incorporates a temperature sensing circuit that detects any temperature above or below a preset temperature value, and either shuts down or limits the output current. In addition, it has short-circuit protection, open-circuit protection, and over-voltage protection.

The AN77L09M is ideal for applications like 5V-to-3.3V/2.5V voltage conversion, battery-based low-voltage regulated power systems and hot-swap-enabled systems. It is also used in test and measurement equipment, 3.3V to 2.5V/1.8V and 5V to 1.8V voltage conversion.

It is a highly efficient, reliable, cost-effective linear voltage regulator IC suitable for a wide range of applications. It uses a single external resistor to set the output voltage and offers high accuracy, protection features, and low power consumption.

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