MIC5206-3.3YMM-TR

MIC5206-3.3YMM-TR Application Field and Working Principle

The MIC5206-3.3YMM-TR is a miniature fixed output, low-dropout voltage regulator with process and temperature compensation, making them ideal for local supplies and off-line applications. The device is offered in a small, SOT-23 package that easily accommodates automatic placement equipment.

Application Field

• Off line converters
• Pulse-width modulation controllers
• Smart cards
• Battery operated systems
• SLIC\'s and isolation amplifiers
• Mobile communications
• Alternative energy systems
• Power management

The MIC5206-3.3YMM-TR is a cost-effective voltage regulator that helps system designers reduce design time, space and cost. The device offers excellent line and load regulation, low dropout performance and a superior power-supply rejection ratio. The device also supports high ripple current and intermittent short-circuit protection.

Working Principle

This voltage regulator is based on Buck (DC-DC) architecture, which is the simplest, generated from a given input voltage, a lower voltage from the available supply as regulated output voltage. The given input voltage is applied across two series resistors, one of which is adjustable, that sets the output voltage. A precision bandgap reference voltage is also applied to one of the resistors. The current through the adjustable resistor creates the feedback which takes the form of a three-stage error amplifier, and current limiting is accomplished with the use of an NPN transistor.

The regulator uses a series pass topology form the feedback network to regulate the output voltage. The series pass element is controlled by a gated driver, which is driven by the error amplifier. To maintain a regulated output voltage, the gated driver adjusts the duty cycle of the pass element. This duty cycle adjustment is based on the input/output regulation loop formed by the error amplifier, the gated driver, and the series pass element.

Conclusion

The MIC5206-3.3YMM-TR is a miniature fixed output, low-dropout voltage regulator with process and temperature compensation, making them ideal for various applications such as off line converters, smart cards, battery operated systems, mobile communications and alternative energy systems. The device offers excellent line and load regulation, low dropout performance and a superior power-supply rejection ratio. The device is also based on a three-stage error amplifier and NPN transistor for current limiting functions, which further make it a cost-effective voltage regulator.