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PMIC - Voltage Regulators - Linear

The MIC39300 series are a range of low-dropout linear voltage regulators from Micrel, Inc. These devices nudge input voltages up or down to a stable target voltage in applications such as computers, communication equipment, automotive systems, water pumps, motor controls, set-top boxes, and other consumer electronics. The MIC39300-1.8BU TR is configured as a voltage regulator with a 1.8V output voltage, a 15mA minimum output current, and a 175mV dropout voltage.

Features

• 1.8V fixed output voltage
• 15mA minimum output current
• 175mV dropout voltage
• 50mA max output current
• 150/125℃ max junction temperature
• 500mV maximum input voltage

Applications

• Computer
• Communication equipment
• Automotive systems
• Water pumps
• Motor controls
• Set-top boxes
• Other consumer electronics

Working Principle

The MIC39300-1.8BU TR is a series of low-dropout linear voltage regulators that utilize a CMOS-based regulation technique to regulate the output voltage. The components used in these regulators are MOSFETs, resistors, and capacitors that are all working together to ensure that the output voltage remains stable, even when the input voltage fluctuates. The voltage regulator will use the MOSFETs to compare the input voltage to the target output voltage, and if a large enough difference is detected, the MOSFETs will switch on and off in order to increase or decrease the output voltage until it reaches the target voltage.

If the input voltage is lower than the target output voltage, the MOSFETs will switch on to boost the output voltage up to the target voltage. If the input voltage is higher than the target output voltage, the MOSFETs will switch off to drop the output voltage back down to the target voltage. This switching action will continue until the input voltage is equal to the target output voltage. The resistors and capacitors are used to control the switching frequency, as well as the current passing through the regulator.

Conclusion

The MIC39300-1.8BU TR series of linear voltage regulators from Micrel, Inc. are designed for applications that require precise regulation of the output voltage. These regulators use a CMOS-based regulation technique that utilizes MOSFETs, resistors, and capacitors to keep the output voltage stable, even when the input voltage fluctuates. The components used in these regulators are optimal for applications such as computers, communication equipment, automotive systems, water pumps, motor controls, set-top boxes, and other consumer electronics.

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