MIC38C44ABM

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MIC38C44ABM - AC DC Converters, Offline Switchers

The MIC38C44ABM is an AC/DC converter and offline switcher integrated circuit (IC) from Micrel, Inc. It is suitable for wide range of high-voltage, low-profile, and low-power applications, such as automotive, communication, consumer, general purpose, industrial, and medical equipment.

Applications

The MIC38C44ABM is a highly integrated, high-efficiency power converter optimized for AC/DC applications, including auxiliary, battery charger, and automotive applications. It also provides high power, light load, and low standby power dissipation. The IC can be used in a wide range of applications, such as lighting modules and other AC/DC switching converters. It is also built with flexible power conversion capabilities and an efficient start-up circuit.

The MIC38C44ABM provides various circuit protection features for electrical noise reduction, over-temperature protection, over-voltage protection, and under-voltage protection. It also has a power factor correction (PFC) circuit that helps reduce the power consumption of the device and helps improve energy efficiency. Additionally, the IC features integrated electromagnetic interference (EMI) filtering capability and self-resetting thermal protection.

Output Specifications

The MIC38C44ABM has an adjustable and synchronizable output voltage range of 0.7V to 16V. It also has an output current of up to 2A. Furthermore, the IC has an operating frequency range of 30 to 500kHz, and an adjustable line EMI filter.

Input Specifications

The IC is designed to operate with an input voltage range from 6.5V to 16V. It also has a peak input current of up to 8A and an input voltage drop of up to 0.3V. Additionally, the IC has a low standby power consumption, which is adjustable from 1mW to 10mW.

Package Type

The MIC38C44ABM is available in a wide range of packages, such as a 28-pin QFN package with a 0.35mm pitch and a 28-pin TSSOP package with a 0.65mm pitch. Additionally, the IC has an exposed pad thermal pad design to help increase the IC\'s thermal dissipation efficiency.

Working Principle

The MIC38C44ABM is a highly feature-rich, synchronous AC/DC switching converter that operates at a fixed frequency and is the perfect solution for power supply applications that require a low-profile, low-cost, and low-power device. The IC is designed to perform synchronous rectification, power factor correction, over-voltage protection, over-temperature protection, and current limiting protection. This IC consists of two main parts: the power stage and the control stage.

The power stage of the IC comprises of a pair of power MOSFETs, an LDO, an inductor, and a capacitor. The control stage comprises of both an Analog and a Digital Unit. The analog control unit consists of an adjustable current-mode-controlled pulse-width modulator (PWM) and a voltage loop. The digital control unit consists of a digital interface, a voltage loop, and an input-voltage sensing circuit. The IC also consists of soft-start circuitry, self-resetting thermal protection circuitry, and EMI filtering circuitry.

The IC operates as a voltage regulator and a pulse-width modulated (PWM) controller. The voltage loop detects the feedback voltage and compares it to the reference voltage. If the feedback voltage is lower than the reference voltage, the PWM controller will increase the duty cycle of the power MOSFETs in order to increase the output voltage. On the other hand, if the feedback voltage is higher than the reference voltage, the PWM controller will decrease the duty cycle of the power MOSFETs in order to decrease the output voltage. This is how the IC regulates the output voltage. In addition, the integrated EMI filter reduces the conducted and radiated emissions from the IC and helps meet industry-standard electromagnetic compatibility (EMC) requirements.

Conclusion

The MIC38C44ABM is a highly integrated and efficient power converter IC optimized for AC/DC applications. It provides an adjustable output voltage range of 0.7V to 16V, making it suitable for a wide range of applications. This IC has an adjustable and synchronizable operating frequency range of 30 to 500kHz, an LDO, an inductor, and an integrated EMI filter. With its wide range of features and capabilities, the MIC38C44ABM is an ideal choice for high-efficiency and low-power AC/DC applications.

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