MC78M12BDT

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	35V
Voltage - Output (Min/Fixed):	12V
Voltage - Output (Max):	--
Voltage Dropout (Max):	--
Current - Output:	500mA
PSRR:	80dB (120Hz)
Control Features:	--
Protection Features:	Over Temperature, Short Circuit
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Supplier Device Package:	DPAK
Base Part Number:	MC78M

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MC78M12BDT is a voltage regulator belonging to the subcategory of linear regulators within power management integrated circuits (PMIC). It is designed to supply an output voltage with accuracy, low noise and high ripple rejection, suitable for a broad range of applications. The MC78M12BDT is a low drop-out (LDO) linear regulator, offering a maximum output voltage of 12 V, a maximum output current of 1 A, and a maximum drop-out voltage of 0.45 V. This LDO regulator is offered in a choice of five fixed output voltages: 5 V, 7.5 V, 8 V, 9 V, and 12 V. It also features a wide input voltage range, of 2.7 V to 36 V, and a low quiescent current of 2 mA.The MC78M12BDT, with its drastically reduced power requirements and stable output voltage, is ideal for a range of automotive and telecommunication applications, due to its high performance in both high temperatures and noisy environments.An integrated short-circuit and thermal protection can protect against overload and over temperature conditions, by limiting the output current or turning off (latching) the device, respectively. An output voltage accuracy of ±2.5% over line and load, temperature and aging variation, plus a maximum line regulation of 0.1% and a load regulation of 0.2%, ensure that the regulation device can be used in applications that demand excellent accuracy, stability and low noise.The device consumes a relatively low quiescent current, under 2 mA, and features a low output voltage noise level of 20 μVP-P. It offers a wide input voltage range, from 2.7 V to 36 V, as well as input reverse polarity protection and output over-voltage protection. The MC78M12BDT needs few external components, making it a good choice for cost sensitive and space constrained applications, such as those found in telecommunications equipment and automotive systems. Additionally, the device can be used in user equipment powered from a battery and it’s also suitable for a wide range of audio applications.In terms of working principle, MC78M12BDT operates a buck regulator, using a p-channel MOSFET to regulate the output voltage. In a typical application, the device is driven by a voltage source of 2.7 V to 36 V. A resistor divider connected between the output and the FB pin sets the output voltage. A 47 nF capacitor on the FAULT pin provides input noise filtering.The output voltage of the MC78M12BDT is regulated by monitoring the voltage at the FB pin, and the error amplifier adjusts the Gate voltage of the p-channel MOSFET to keep the voltage at the FB pin close to the reference voltage value. The reference voltage is set by the resistor divider connected to the FB Pin, so the output voltage follows that value.When the device is overloaded and the output current tries to exceed the device\'s maximum output current, the OVP pin will go high to signal the fault condition and turn off the device. It will also terminate the output short-circuit protection. The MC78M12BDT voltage regulator is an ideal choice for a variety of applications. It offers excellent output voltage accuracy and noise performance, as well as its wide range of input and output voltages, in addition to its integrated short-circuit and thermal protection. It also features low quiescent current and can be used in applications with strict space constraints. Able to operate at high temperatures and in noisy environments, the MC78M12BDT also solves many of the most common voltage regulating concerns. It is especially suitable for telecommunication, automotive and audio applications.

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