MC7809CT

Current - Output:	1A
Base Part Number:	MC7809
Supplier Device Package:	TO-220AB
Package / Case:	TO-220-3
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	61dB (120Hz)
Current - Quiescent (Iq):	8mA
Series:	--
Voltage Dropout (Max):	2V @ 1A (Typ)
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	9V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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MC7809CT Application Field and Working Principle

MC7809CT is a linear voltage regulator by Texas Instruments. It belongs to the PMIC (Power Management IC) family and provides a regulated output from an unregulated input. This device offers superior power supply regulation and power conservation with low quiescent current, advanced thermal shutdown and overload protection features.

Overview

MC7809CT, also known as the TPS7A09, is a 9V fixed output, low dropout (LDO) linear voltage regulator. It is similar to MC7800 series in many ways. Its output voltage is fixed at a given value and it can support up to 1A of current. This device has an input voltage of 7V to 40V, with an output current of up to 1A. It also features an integrated pass transistor and undervoltage lockout (UVLO) to protect the power supply during Brownouts and to provide additional safety during startup. The device’s thermal shutdown feature helps protect it from thermal overload and limits the device temperature. The MC7809CT’s low quiescent current (1 mA typ) and low output voltage noise characteristics help reduce power consumption and enable DC/DC applications to draw less than 1A of current from the main power bus. Additionally, the device’s low drop out voltage (LDO) allows the device to be used in a wide variety of applications. The TPS7A09 also features an overcurrent protection (OCP) function, which helps protect the device from damage due to over current. With an applicable operating temperature range from -40-125 °C and a power dissipation of up to 2W, the MC7809CT offers excellent performance and reliability for a variety of applications in automotive, industrial, consumer, and other power supply applications.

Pin Configuration and Layout

The MC7809CT has a total of four pins. It is a three-terminal regulator device, with the input voltage and ground pins on the left side and the output voltage pin on the right side. The device is typically used as a standalone device and can be easily interfaced with an external circuit through its ground, input voltage, and output voltage pins. The device also has a thermal shutdown pin, which can be optionally used as a protective mechanism and monitored periodically through the use of a temperature sensor. The device comes in a surface mount package and occupies very little board space due to its compact form factor.

Working Principle

The MC7809CT operates on a linear regulator topology, with the input voltage and groundconnected to the power supply and the output voltage connected to the regulated load. The internally integrated pass transistor serves as an active low dropout (LDO) to allow the device to regulate and maintain the output voltage at a 1.3V dropout (maximum) from the input voltage. The pass transistor also helps reduce voltage drops and increase efficiency. When the device is powered, the device’s quiescent current adds to the current draw of the input voltage. As the device approaches the maximum dropout voltage, the pass transistor limits the output voltage at 1.3V or lower to protect the device from damage or overvoltage conditions.The output voltage is stabilized by a pair of error amplifiers. The error amplifiers sense the difference between the actual output voltage and the reference voltage, and generate a signal to the pass transistor to adjust the voltage accordingly. This allows the device to regulate the output voltage within a predetermined range, ensuring a stable voltage to the load.In addition to the output voltage regulation, the MC7809CT also features an integrated low-power undervoltage lockout (UVLO) circuit, which prevents the device from operating when the input voltage is too low. The UVLO will ensure the device stays in a safe state if an unprotected power is sourced. Also, the device offers an integrated thermal shutdown feature that helps protect the device from thermal overload conditions by automatically disabling the device when the die temperature exceeds a preset limit. The device can be easily disabled or enabled by a control signal (such as a digital input pin) and can be monitored for temperature fluctuations with the use of a temperature sensor. The device also features an overcurrent protection (OCP) function, which helps protect the device from current overloads and shorts. In the event of an OCP, the device will be disabled, ensuring that no further damage is caused.

Applications

The MC7809CT is an ideal solution for DC/DC applications, such as portable electronic devices and automotive power supplies, as well as other applications where a low-dropout (LDO) voltage regulator is needed to reduce the noise and ripple of the input voltage. Additionally, its low-power design makes it suitable for use in battery-powered or low-power applications. It is also used to regulate voltage in automotive applications, as well as in a variety of consumer and industrial applications. Overall, the MC7809CT is an excellent solution for providing stable power rail solutions and power conservation in a variety of applications. Its integrated features and low-power consumption makes it an ideal choice for a variety of power supply applications.

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