MIC2179BSM

Voltage - Output (Min/Fixed):	1.245V
Base Part Number:	MIC2179
Supplier Device Package:	20-SSOP
Package / Case:	20-SSOP (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz
Current - Output:	1.5A
Voltage - Output (Max):	16.5V
Series:	--
Voltage - Input (Max):	16.5V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Discontinued at Digi-Key
Packaging:	Tube

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Introduction

The MIC2179BSM is a high performance, monolithic integrated circuit designed as a buck switching regulator. It is a power management integrated circuit (PMIC) that reduces the on-board voltage level from higher voltage sources. This type of regulator is typically used to regulate the power supply connections to digital logic ICs, such as microprocessors or digital signal processors. This particular regulator IC is used primarily for applications that require the output voltage to be tightly regulated.

The key features

The MIC2179BSM features an accurate current-mode control loop along with a power factor correction (PFC) to help ensure precision and stability. The MIC2179BSM is capable of providing an output voltage range of 2.5V to 5.5V, with a typical accuracy of ±3% with a maximum line regulation of ±1%. Its switching frequency can be adjusted between 200kHz and 550kHz, providing excellent efficiency and reduced noise level. This DC-DC switching regulator also provides over current protection and current limit for improved circuit protection.

Application fields

The MIC2179BSM is particularly suitable for applications that require accurate current flow, such as notebooks, tablets, and mobile phones. Its combination of PFC and current-mode control loop enable the IC to provide an accurate and stable output voltage, ensuring reliable operation of digital logic ICs throughout the entire range of operating conditions. This DC-DC switching regulator IC is also highly suitable for applications such as medical equipment, multi-rail power conditioning, and industrial instrumentation.

Working principle

The MIC2179BSM is designed to operate by converting a higher input voltage into a lower, regulated output voltage. This is accomplished through the use of a buck switching regulator design. In this design, a pulse width modulator (PWM) is used to control the width of the pulses generated by the IC. The width of the pulses is varied in response to the changes in load current, thus achieving high efficiency and very low noise levels.The PWM signal that is generated by the MIC2179BSM IC is an alternating square wave signal that is produced by the on-board oscillator. The frequency of the signal is adjustable between 200kHz and 550kHz, providing excellent frequency response and precise operation. The duty cycle of the PWM signal is adjusted in response to changes in the load current, thus producing the desired output voltage.When the PWM signal is fed to the output stage, it generates the output voltage, which is regulated by the current-mode control loop provided by the MIC2179BSM. The current-mode control loop allows the IC to accurately maintain the desired output voltage and ensure reliable operation of digital logic ICs throughout the entire range of operating conditions. The PFC feature of the IC also helps minimize power losses and improve power delivery efficiency.

Conclusion

The MIC2179BSM is an advanced, highly efficient buck switching regulator IC that is designed to provide an accurate and stable output voltage. Its combination of PFC and current-mode control loop enable the IC to achieve precise operations and achieve high efficiency. This regulator IC is particularly suitable for applications in notebooks, tablets, mobile phones, and other equipment that require accurate current flow. In conclusion, the MIC2179BSM is an ideal choice for a variety of power conditioning applications.

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