MAX738AEPA+

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The MAX738AEPA+ is a DC-to-DC switching voltage regulator from Maxim Integrated, one of the most renowned semiconductor companies in the world. This variable-output, step-up voltage regulator offers both low-output voltage accuracy and high-output power capability. It is one of several voltage regulators that Maxim offers, making it a great choice for a wide range of applications. The MAX738AEPA+ is widely used in automotive, industrial, and medical applications requiring regulated DC output voltages. In this article, we will explore the application field and working principle of the MAX738AEPA+.

Application Field of the MAX738AEPA+

Due to its excellent voltage regulation, switch frequency flexibility, and wide input voltage range, the MAX738AEPA+ is typically used in automotive, industrial, medical, and military applications requiring high accuracy and switching speed. This switchmode voltage regulator can operate from a wide input voltage range of 2.7V to 25V. It also offers a wide variety of output terminals, and it can be configured to meet nearly any regulation or protection requirement.

The output voltage of the MAX738AEPA+ can be adjusted from 0.8V to a maximum of 14V, providing stable power and HP and LP protection. Its high-switching frequency makes it more efficient than traditional linear-regulators. In addition, the MAX738AEPA+ offers a low dropout voltage (LDV) of 1V at full load current, making it an ideal choice for applications needing high output power.

The MAX738AEPA+ is especially well-suited for automotive applications such as power management, engine control module applications, power-on reset (POR), and starter applications. In addition, the MAX738AEPA+ is often used in medical applications such as patient monitoring, portable radiography, and home healthcare, as well as in industrial applications such as powering barcode scanners, RFID readers, and power conditioning systems.

Working Principle of the MAX738AEPA+

The MAX738AEPA+ is a step-up boost switching regulator with an output range of 0.8V to 14V. It is based on a fixed frequency quasi-resonant architecture that reduces electromagnetic interference (EMI). The MAX738AEPA+ operates in two modes: PFM (Pulse Frequency Modulation) mode and PWM (Pulse Width Modulation) mode. In PFM mode, the output of the regulator is frequency modulated in order to maintain efficiency over a wide load range. In contrast, in PWM mode, the output is regulated by varying the duty cycle of the pulses applied to the output switch, with the output voltage proportional to the duty cycle. The switch frequency of the MAX738AEPA+ can be adjusted manually to optimize design in different applications.

The MAX738AEPA+ also has over-current protection, output over-voltage protection (OVP), cycle-by-cycle current limiting, over-temperature protection (OTP), and short-circuit protection (SCP). The OTP is implemented as a hiccup-style response that shuts off the output and re-starts the device after the temperature has been reduced. In addition, the SCP is implemented as a foldback limit, reducing the current to a value that is proportional to the output voltage.

The MAX738AEPA+ also features a variety of other features such as frequency synchronization, enable control, and adjustable soft-start. The enable control feature allows the output to be turned ON or OFF using an external signal, while the adjustable soft-start feature helps reduce the inrush current at power-up. Lastly, the MAX738AEPA+ has a wide operating temperature range of -40°C to +85°C, making it suitable for many automotive and industrial applications.

Conclusion

The MAX738AEPA+ is a DC-to-DC switching voltage regulator from Maxim Integrated that offers both low-output voltage accuracy and high-output power capability. With its excellent voltage regulation, switch frequency flexibility, wide input voltage range, and variety of output terminals, the MAX738AEPA+ is an ideal choice for automotive, industrial, medical, and military applications. Furthermore, its features such as frequency synchronization, enable control, and adjustable soft-start make it easy to design and configure. The MAX738AEPA+ is a highly versatile switchmode voltage regulator and is suitable for a wide range of applications.

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