MC7905BD2TR4

Voltage Dropout (Max):	1.3V @ 1A (Typ)
Base Part Number:	MC79
Supplier Device Package:	D2PAK
Package / Case:	TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	70dB (120Hz)
Current - Output:	1A
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	-5V
Voltage - Input (Max):	-35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Negative
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

MC7905BD2TR4 is a linear voltage regulator IC specifically designed to supply power to modern electronic circuits while providing good regulation performance and a compact form factor. This IC is categorized under PMIC – Voltage Regulators – Linear and is suitable for various applications that require reliable regulated voltages, such as cellular phones, satellite dishes, transformerless AC-DC converters, and LED lighting.

Application Field

MC7905BD2TR4 can be used for a variety of applications, including for supplying main power for modern electronic circuits, acting as a bias voltage generator for integrated circuits, buffering signal levels between low- and high-side interfaces, providing regulated outputs for auxiliary power supplies, and for power back-up circuitry. It is mainly used in consumer electronics, industrial electronics, telecommunications, and automotive electronics.

Definition and Working Principle

MC7905BD2TR4 is a low-dropout (LDO) linear voltage regulator that requires only 1V of input voltage differential at the input to maintain a constant output voltage. It is a three-terminal positive voltage with an adjustable voltage range of 2.2V to 9.5V. The TO-220AB package allows for easy mounting on low-cost PC boards.The MC7905BD2TR4 IC employs a linear regulation approach by regulating its input voltage to ensure it is maintained at the desired level. It adjusts the output voltage by controlling the amount of current that is allowed to flow through the internal p-type field-effect transistor (FET) pass transistor. As the output voltage increases, the voltage at the gate terminal of the pass transistor is increased, thus reducing the amount of current flowing through the FET. This reduces the output voltage, returning it to the desired level.The MC7905BD2TR4 IC features an on-board thermal shutdown circuit that activates at overwound temperatures, thus protecting the device from thermal fault conditions. It also features a current-limit protection mechanism and reverse current protection, to protect the device from overload and overvoltage conditions.

Advantages and Disadvantages

The main advantages of the MC7905BD2TR4 IC are its small form factor, low quiescent current, high power density, adjustable output voltage, on-board thermal shutdown, current-limit protection, as well as protection from reverse currents.However, its main disadvantages are limited temperature range and the need for additional external components for adjustments to be made to the output voltage.

Conclusion

The MC7905BD2TR4 IC is a linear voltage regulator specifically designed to supply power to modern electronic circuits while providing good regulation performance and a compact form factor. It is suitable for a variety of applications, including supplying main power, buffering signal levels, providing auxiliary power supplies, and providing power back-up circuitry. This IC features a small form factor, low quiescent current, high power density, adjustable output voltage, thermal shutdown circuit, current-limit protection, as well as protection from reverse currents. Additionally, its TO-220AB package allows for easy mounting on low-cost PC boards. However, its main disadvantages are limited temperature range and the need for additional external components for adjustments to be made to the output voltage.

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