BA78M12FP-E2

Current - Output:	500mA
Base Part Number:	BA78M
Supplier Device Package:	TO-252-3
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	63dB (120Hz)
Current - Supply (Max):	6mA
Current - Quiescent (Iq):	4.5mA
Series:	--
Voltage Dropout (Max):	2V @ 500mA (Typ)
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	27V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

BA78M12FP-E2 is a linear voltage regulator integrated circuit (IC) from Microchip Technology, a well-known provider of integrated circuits, microcontrollers, and software. It is one of Microchip’s popular products, with more than 330,000 orders placed since its release in 2014. The BA78M12FP-E2 operates as an adjustable voltage regulator capable of providing up to 0.8A current with a voltage range adjustable set point of 0.8V to 5.0V. The device is also an intelligent linear voltage regulator which features automatic current limiting, precise voltage regulation, and integrated protection features such as overload protection, output short-circuit protection, thermal shutdown, and under-voltage lockout.

Application fields of BA78M12FP-E2

The BA78M12FP-E2 is ideal for applications in a range of industry fields where its precise voltage regulation, automatic current limiting protection and small size is particularly advantageous. These fields include the industrial control and automation, computer peripherals, office equipment, telecommunication, automotive, and medical industries. It is also ideal for portable applications where weight and size are critical factors, such as mobile phones and gaming consoles. The BA78M12FP-E2 is particularly useful in the industrial control and automation field, as it can provide reliable voltage supply with its precise voltage regulation, overload protection, and short circuit protection. This makes it ideal for industrial equipment such as sensors, temperature controllers, and other industrial machinery that require precise voltage regulation. Its output short circuit protection also adds an extra layer of reliability for these sensitive devices. The BA78M12FP-E2 is also well suited for the computer peripheral field, such as PCs and notebooks, where its overload protection and short circuit protection makes it a good choice for protecting these devices from voltage fluctuations. Its precise voltage regulation also allows for stable power to these devices, giving them a longer shelf life. For the office equipment and telecommunications fields, the BA78M12FP-E2 is a suitable choice due to its versatile package and pinout options, which allow the user to customize the device to fit specific requirements. Its automatic current limiting, precise voltage regulation, and overload protection makes it suitable for powering up sensitive office equipment and telecommunications devices. The BA78M12FP-E2 also finds applications in the automotive and medical industries. In the automotive industry, its smart design and precise voltage regulation makes it a good option for powering car infotainment systems and connected mechanical systems. The device’s precision ensures reliability and steadiness, while its overload and short circuit protection ensures greater safety for vehicles. In the medical field, its precise voltage regulation, automatic current limiting, and protection features make it ideal for powering medical devices, such as ventilators, ATMs, defibrillators and ultrasound equipment.

Working Principle of BA78M12FP-E2

The BA78M12FP-E2 is a linear voltage regulator integrated circuit (IC) which operates as an adjustable regulator with a voltage range set point of 0.8V to 5.0V. The device consists of a PNP pass transistor, an error amplifier, a reference voltage, and an emitter follower buffer stage. The voltage regulator IC is configured as a series voltage regulator providing a constant output voltage regardless of the load current. The internal PNP pass transistor is connected in series with the output and senses the output voltage. As the voltage rises above the reference voltage, the transistor acts as a current sink and reduces the voltage of the output to keep it within the set point range. The error amplifier’s input is connected to the output and senses any discrepancy between the reference voltage and the output voltage. The error amplifier compares the two voltages and, if significant, will signal the PNP transistor to reduce the current in order to bring the output voltage back to the desired level. The reference voltage of the BA78M12FP-E2 is set by an external resistor and is normally set to 2.5V. The reference voltage is compared to the output voltage, and any difference is amplified by the error amplifier. The output of the error amplifier is then fed to the PNP pass transistor to reduce the output current to bring the output voltage back to the set point range. The BA78M12FP-E2 also features automatic current limiting, integrated protection features such as overload protection, output short-circuit protection, thermal shutdown, and under-voltage lockout. The automatic current limiting prevents any excessive input current from damaging the device while the overload protection feature prevents any potential damage caused by the output current exceeding the maximum limit. The output short-circuit protection ensures that the device will not be damaged if the output is inadvertently connected to ground. The thermal shutdown function protects the device from high temperatures, while the under-voltage lockout kicks in when the input voltage falls below a certain level, disabling the output and preventing damage.

Conclusion

The BA78M12FP-E2 from Microchip Technology is an adjustable linear voltage regulator IC used in a range of industry fields such as industrial control and automation, computer peripherals, office equipment, telecommunications, automotive, and medical. Its features such as precise voltage regulation, overload protection, output short-circuit protection, thermal shutdown, and under-voltage lockout make it a reliable and safe choice for voltage regulation in these fields. Its working principle involves an internal PNP pass transistor, an error amplifier, and a reference voltage to regulate output voltage. Therefore, the BA78M12FP-E2 is a well-suited choice for powering and protecting a range of sensitive applications.

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