REG710NA-3/3K

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REG710NA-3/3K is an adjustable low dropout regulator designed for applications where a high-current regulator is needed for high-voltage input, such as notebook and desktop computer power supplies. It is also used in automotive, communication and consumer applications. The REG710NA-3/3K employs a current-limited, pulse-frequency modulation (PFM) topology, which enables high-efficiency, low noise operation.

Application Field

The REG710NA-3/3K is suitable to be used in automotive, consumer, computer and communication applications such as notebook and desktop computer power supplies, wireless radios and cable modems, external storage devices, LCD TVs, and charge pumps.

Working Principle

REG710NA-3/3K features a low-dropout regulator topology that uses a current-limited, pulse-frequency modulation (PFM) control scheme. The device is designed to provide controlled current to a load even at low input voltages and can handle up to 3A output current. The PFM control scheme senses the voltage drop across the output, internal current-sense resistor, and control-loop compensation capacitor to achieve regulation.

The REG710NA-3/3K has a built-in current-limit protection circuitry that can be used to limit the output current to a safe level when an overload condition is detected. As the current limit value is being exceeded, the output voltage is reduced to maintain safe operation and prevent overloading or overheating. The current limit value is factory preset at 2.5A and can be adjusted by an external resistor.

The device also has an enable pin which can be used to turn the device off and reduce power consumption. The enable pin can be used to synchronize switching frequency to an external clock or to disable the device during stand-by modes. Furthermore, the device can be enabled with a logic voltage on the enable pin, and the logic level is selected with a jumper.

The device also includes a reset output pin which can be used to generate a reset signal when the output voltage drops below its minimum voltage value. The reset output pin can be connected to system monitors or microcontrollers to provide information when the output voltage drops below the set value. The response time of the reset pin is adjustable with an external resistor.

The device also uses a constant current foldback function that limits output current under overload conditions. Once the rated output current is exceeded, the internal protection circuitry reduces the output current by decreasing the switching frequency. During constant current foldback, the switching frequency is reduced such that the output current is reduced below the rated value of the device. The device will automatically recovers and resume normal operation once the overload condition is removed.

Conclusion

The REG710NA-3/3K is a versatile and adjustable low dropout regulator designed for high-current applications. The device is suitable for automotive, consumer, computer, and communication applications such as notebook and desktop computer power supplies, wireless radios and cable modems, external storage devices, LCD TVs, and charge pumps. The device features a current-limited, pulse-frequency modulation control scheme and includes a built-in current-limit protection circuitry. It also includes an enable pin and a reset output pin to provide additional control and protection. The device also includes a constant current foldback function that limits output current under overload conditions.

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