MC7809CD2T

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MC7809CD2T Application Field and Working Principle

The MC7809CD2T is a linear voltage regulator from Texas Instruments. It is a 9 V, low dropout (LDO) linear regulator and is capable of delivering up to 1 A continuous current. It is stable with ceramic output capacitors and has fast transient response times. The device is mainly used in computer and server power management, industrial applications, automotive applications, and battery charging systems. As a linear voltage regulator, this device is designed to provide a regulated voltage with a low output noise, low dropout voltage, and fast transient response.

Features

• Input voltage range: 2.2 V - 14 V
• Output voltage range: 8.5 V - 9.3 V
• Output current range: 0.2 A - 1 A
• Dropout voltage: 350 mV (1 A)
• Output noise: 1.6 mV (0.1 to 10 Hz)
• Transient response: 3 mV/us
• Enable pin for power-down state
• APPLICABLE STANDARDS: AEC-Q100

Working Principle

The MC7809CD2T is a 3- terminal voltage regulator. It uses an internal pass element, typically an NPN bipolar transistor, with an output impedance determined by the amount of current fed into the base of the pass element. A feedback resistor from the output to the error amplifier is used to control the output voltage. The totem pole output stage consists of an NPN transistor whose collector is connected to the output and the emitter is connected to ground. The output voltage is set by the ratio of two resistors placed between the REF and GND pins, i.e., a "divider".

To begin regulating, a minimum bias current of 5 mA is fed into the base of the pass element through the REF pin. The output voltage is determined by the voltage on the REF and GND pins, which is set by the resistor divider. The error amplifier then compares the voltage on the output to the voltage on the REF pin. When the output voltage is higher than the reference voltage, the error amplifier will turn off the NPN switch, which will reduce the output current. When the output voltage is lower than the reference voltage, the error amplifier will turn on the transistor which will increase the output current. In this way, the output voltage is regulated

Conclusion

The MC7809CD2T is a linear voltage regulator from Texas Instruments. It is a 9 V, low dropout (LDO) linear regulator and is capable of delivering up to 1 A continuous current. It is stable with ceramic output capacitors and has fast transient response times. The device is mainly used in computer and server power management, industrial applications, automotive applications, and battery charging systems. The MC7809CD2T is a three-pin regulator that uses an internal pass element, typically an NPN bipolar transistor, to control the output voltage. The output voltage is regulated by comparing the voltage on the output to the voltage on the REF pin. The MC7809CD2T is a highly efficient, reliable, and versatile voltage regulator.

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