MIC39501-1.8BU

Voltage Dropout (Max):	0.575V @ 5A
Base Part Number:	MIC39501-1.8
Supplier Device Package:	TO-263-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	--
Current - Output:	5A
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	16V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The MIC39501-1.8BU is a type of precision low dropout voltage regulator (LDO) belonging to the linear voltage regulator family. This linear regulator is designed to provide accurate, low noise output voltage regulation and is generally used in medium to low current applications. It is also optimized in order to minimize power quiescent current (Iq).

Initial Specifications

The MIC39501-1.8BU has an adjustable output from 1.8V to 5.5V and an improved ±1.5% accuracy over the full load and temperature range. It incorporates a Total Error Band (TEB) function for voltage regulation, which provides a tighter loop response, better line regulation and lower component variations. It is also capable of output currents up to 200mA. Furthermore, its very low dropout voltage makes it very efficient in low current applications with a typical dropout voltage of only 95mV across the full operating temperature range.

Application Field

The MIC39501-1.8BU is optimized to provide linear voltage regulation in a wide range of applications. Some of the most common use cases include:

• Portable battery powered systems.
• Cellular phones and modems.
• MP3 players.
• Analog and digital circuits.
• Portable instruments and sensors.
• Portable medical and wearables.
• Satellite radio receivers and transmitters.
• Storage and communication equipment.

Working Principle

The MIC39501-1.8BU uses a series of integrated components and discrete parts in order to regulate and maintain a consistently low output voltage. This linear regulator works with an input voltage range of 2.25V to 5.5V, which could be supplied by a battery, plug-in adapter, or power bus.One integrated component inside the circuit is an error amplifier that compares the reference voltage provided by the voltage reference pin (Vref) to the output voltage and amplifies the difference between the two signals. This difference, also known as the error signal, is then transferred to an integrated control circuit at the output of the error amplifier.The control circuit uses the error signal to adjust the output voltage of the device. This is done by controlling the amount of current flowing through a sense resistor from the output to the ground pin (ADJ) to adjust the output voltage. The output voltage is therefore stabilized by the combination of the feedback loop, the error amplifier and the internal control circuit.

Conclusion

The MIC39501-1.8BU is a type of linear voltage regulator, designed to provide accurate low noise output voltage regulation. With an adjustable output ranging from 1.8V to 5.5V, an improved ±1.5% accuracy, and ability to output up to 200mA, this linear regulator is suitable for a wide range of applications. It is also capable of maintaining the output voltage with very low dropout voltage, making it an efficient and reliable regulator for low current applications.

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