MIC5158YN

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Positive Fixed or Adjustable
Number of Outputs:	1
Current - Supply:	4.5mA
Voltage - Input:	3 V ~ 36 V
Operating Temperature:	-40°C ~ 85°C
Package / Case:	14-DIP (0.300", 7.62mm)
Supplier Device Package:	14-DIP
Base Part Number:	MIC5158

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MIC5158YN Introduction

The MIC5158YN is a linear regulator controller specifically designed for low-EMI, high current applications. This component is ideal for use in a variety of applications where low-noise output power is required and/or high current load is present. It offers very high accuracy and a wide voltage range, as well as protection features against over-voltage, over-current and thermal shutdown conditions. Its proprietary control architecture offers excellent EMI performance while providing fast transient response.

MIC5158YN Application Field

The MIC5158YN can be extensively used to design DC/DC buck regulator power supplies for a variety of applications that require very low-noise output power. This controller is particularly suitable for applications such as: * Telecommunications & networking equipment* Automotive Safety & lighting systems * Industrial CNC machines & equipment* ATM & Point Of Sale (POS) systems* HVAC systems* Portable & embedded electronics* Battery-powered equipmentThe MIC5158YN is also widely used for power supply design in applications where precise control and high performance are required. Such applications include: * Test & Measurement Equipment* Professional Audio/Video* Instrumentation Equipment* Medical Diagnostic & Imaging* Metering & Monitoring Equipment* Military & Aerospace Systems* High-end Computing & Servers

MIC5158YN Working Principle

The MIC5158YN is a high speed and high performance voltage regulator controller. It is designed to increase current capability and efficiency of buck regulator power supplies. At the heart of the regulator are two on-chip mosfets, connected in parallel and their gate drive circuits. The input voltage is sensed by an internal voltage divider, fed to a high accuracy comparator. This comparator indicates when the input voltage is greater than the preset output voltage, turning ON the upper mosfet and turning OFF the lower mosfet, thus maintaining the output voltage. The amount of current being sourced from the input is continuously monitored, providing an accurate indication of the output voltage error. If the output voltage is too high, switching the lower mosfet off and the upper mosfet on, causing the output voltage to be reduced.The MIC5158YN includes an on-chip oscillator that sets the nominal switching frequency. The oscillator frequency can be adjusted by an external capacitor. It also includes an on-chip error amplifier that constantly monitors the output voltage, using a voltage divider connected to the output. The error amplifier provides a voltage proportional to the output voltage that is compared to the internal reference to adjust the oscillator frequency. The frequency adjustment ensures that the current drawn from the input always equals the output current, and that both the output voltage and efficiency are maintained.The MIC5158YN also includes built-in safety features to protect the device against over-voltage, over-current and thermal shutdown conditions, thus ensuring long life and reliable operation in any application. For example, the output voltage of the regulator is monitored by an internal feedback circuit, providing an over-voltage protection. If the output voltage is greater than the preset value, the IC will interrupt the power supply, shutting down the output, thus protecting the system from an over-voltage condition. Similarly, the MIC5158YN also includes an over-current protection circuit, which will detect a short circuit at the output, shutting down the regulator before any damage is done.Finally, the MIC5158YN includes an on-chip thermal shutdown circuit that protects the device from overheating conditions. The thermal protection circuit monitors the device\'s internal temperature and automatically shuts down the system in case of excessive heat. This feature helps prevent device damage and ensures safe operation in any application.

Conclusion

The MIC5158YN is an ideal linear regulator controller for low-EMI, high power applications. It offers high accuracy, wide voltage range and several built-in protection features that protect the device from hazards such as over-voltage, over-current and thermal shutdown conditions. With its low-noise output and ability to accurately control current, the MIC5158YN is the perfect solution for a variety of power supplies, ranging from telecommunications and automotive systems to medical imaging and aerospace equipment.

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