AN80L48RMS

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An 80L48RMS is an integrated linear voltage regulator, commonly referred to as a “PMIC,” widely used in the communications sector due to its low cost, low quiescent current, low input voltage, and low dropout voltage combined with high accuracy. This device is well-suited for voltage regulation of telecom, networking, and power supply controllers, such as battery-powered devices and applications requiring regulated output voltages of less than 5 volts.

The 80L48RMS is designed around regulator circuits that use a poly-phase regulation technique, which is capable of maintaining very accurate output voltages over a wide input voltage range. Furthermore, this device can typically supply up to 200 mA of output current, making it suitable for many DC/DC converter and battery charger applications where higher current levels are required.

The 80L48RMS has an advanced detection circuit with automatic voltage switch-over capabilities, allowing it to be used for multiple-voltage devices with different output voltages. This PMIC can self-detect when the voltage on the power source changes and automatically switch the output voltage to the appropriate value. It also includes a wide range of protection features, such as short-circuit protection, over-voltage protection, under-voltage protection, and over-current protection.

The 80L48RMS design includes several advanced features such as a thermal shutdown circuit, a soft-start circuit, and an over-voltage protection circuit. The thermal shutdown circuit prevents the device from overheating, while the soft-start circuit ensures a gradual start-up by providing a gradual buildup in output current. The over-voltage protection circuit prevents excessive output voltage, or over-voltage conditions, from damaging the device.

In operation, the device uses two internal N-channel MOSFETs with an output current limit of 200 mA. The two MOSFETs are connected in series, so that the current passing through the device is limited to the same voltage as the output voltage. When the output voltage is elevated, the MOSFETs limit the output current and maintain a constant output voltage.

The 80L48RMS also employs a control loop that acts as a voltage regulator. The control loop acts to regulate the output voltage by controlling the active current in the output MOSFETs. This regulation of output current is accomplished by changing the gate capacitance of the MOSFETs, resulting in a change in the output voltage.

The 80L48RMS is an ideal device for applications where space constraints are important, such as in portable and mobile applications, as it is quite small and requires a limited number of external components. This gives the device the flexibility to be used in a wide range of applications, from power supply controllers to battery chargers and wireless devices.

In summary, the 80L48RMS PMIC is a well-suited device for applications requiring regulated output voltages of less than 5 volts, low cost, low quiescent current, low input voltage, and high accuracy.

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