NJM7809FA

Voltage Dropout (Max):	--
Supplier Device Package:	TO-220F
Package / Case:	TO-220-3 Full Pack
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	72dB (120Hz)
Current - Quiescent (Iq):	6mA
Current - Output:	1.5A
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	9V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Bulk

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NJM7809FA Application Field and Working Principle

NJM7809FA is a linear regulator that belongs to the family of PMIC (Power Management Integrated Circuits), specifically in the Voltage Regulators - Linear branch. It is a three-terminal voltage regulator with a 9V 0.3A output voltage. The output current is current-limited and protected against short-circuit turns on and off. This low-dropout voltage regulator offers great versatility and wide range of protection in a small SOT-89 package.The application fields of NJM7809FA include post-regulation for switching regulator and battery charge posts, voltage transducers, or other low power circuits that require low-drop-voltage and current-limiting control functions. The device is well suited for applications in small/medium systems with multiple power sources and distributed peripheral voltages. NJM7809FA is also well suited for use in subcritical voltage application, such as regulation of 5V processor supplies. It can also be used for automotive and high temperature applications.

Working Principle of NJM7809FA

NJM7809FA operates by using a voltage reference directly connected to the output while controlling the output voltage. It passes current through a pass element such as an N-channel MOSFET, which has its gate controlled by a signal derived from the output voltage. This control signal is also referenced to the same voltage source as the MOSFET.The internal circuitry of the NJM7809FA has two essential components - a voltage reference and a pass element. The voltage reference is used to regulate the output voltage to the desired voltage level. The voltage reference also sets the current limit of the device by creating a feedback loop from the output to the pass element. The pass element is used to pass the current which is regulated in the circuit. This is usually a P channel MOSFET, but it can also be a bipolar transistor.If the output voltage rises above the reference voltage, then the current flowing through the pass element is decreased. This reduces the current passing through the circuit and hence reduces the output voltage. This is how the device maintains the output voltage at the desired level. The NJM7809FA also offers several protection features, such as over temperature protection as well as overvoltage protection. The device has a current-limit of 0.3A, as mentioned before and it\'s recommended ambient temperature range is from -40°C to +85°C. The device also has an active low thermal shutdown with a hysteresis of 55°C, which ensures that the device does not overheat. The device is also protected against up to 30V of load dump voltage.In conclusion, NJM7809FA is a linear regulator that belongs to the family of PMIC (Power Management Integrated Circuits), specifically in the Voltage Regulators - Linear branch. It can provide adjustable output linearly voltage ranging from 1.2V to 9V with a load current of 0.3A. It is suitable for a wide range of applications, such as post-regulation, voltage transducers, and others. The device is also designed with multiple protection features like over temperature protection, over current protection, and even overload overspeed protection.

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