NJM79L05A

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NJM79L05A is a linear voltage regulator integrated circuit (IC) that belongs to the NJM79xx family of ICs developed and released by the Japan Radio Corporation (JRC) in 1970s. This IC is an adjustable voltage regulator that supports an adjustable output voltage between 2.2V and 5.2V and a load current up to 100mA. It features a low quiescent current and is mainly used for automotive and portable device applications such as notebook computers and power banks.

The NJM79L05A is a three-terminal regulator similar to the well-known 78xx voltage regulators and uses a PNP pass transistor as the main switching device. The main difference between the NJM79xx regulators and the 78xx regulators is that the NJM79xx regulators use the Positive-Voltage Voltage Regular (PVR) control circuit. This type of control circuit allows the regulator to have a lower voltage drop when regulating the output voltage, making it more efficient and allowing higher load currents up to 100mA while maintaining a minimum dissipation.

The NJM79L05A has a maximum input voltage rating of 20V and a maximum output voltage of 5.2V so it can operate from a wide range of input voltages. The minimum input voltage should be chosen based on the maximum output current that the NJM79L05A is intended to deliver. Since the nominal maximum input voltage for the NJM79L05A is 20V, the minimum input voltage should be at least 2.2V for a load current of 100mA. This type of regulator is suitable for use with a wide range of mobile phones, notebook computers and battery chargers.

The NJM79L05A has two enable pins, one at the positive terminal (EN1) and one at the negative terminal (EN2). The EN1 pin is used to connect a high value resistor in series with the input power supply to enable the regulator, while the EN2 pin is used to disconnect the output of the regulator and reduce the power consumption when the regulator is not needed. The EN1 and EN2 pins also allow the circuit to be remotely controlled using external logic signals.

The NJM79L05A is also configured with a number of protective features to prevent damage to the IC in the event of abnormal operating conditions. Aside from overvoltage protection, the NJM79L05A also features overcurrent shutdown, thermal shutdown and short-circuit protection. These features ensure that the regulator will not be damaged even when there is an abnormal load condition or the circuit it is powering experiences a fault condition.

In conclusion, the NJM79L05A is a linear voltage regulator IC that is well-suited for automotive and portable device applications. The regulator has a wide input voltage range and a maximum output current of up to 100mA, and features a number of protective features, making it ideal for use in stabilizing the power supply of mobile phones, notebook computers and battery chargers.

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