MAX1875AEEG+

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MAX1875AEEG+ Application Field and Working Principle

The MAX1875AEEG+ is a highly versatile, high-power DC-DC switching controller designed for a wide range of power management applications. This device provides a comprehensive solution for powering mobile communications, industrial and other high-voltage systems, with a high switching frequency and low EMI noise output. It features a low drop-in voltage, enabling the efficient utilization of input power supplies. This device is Programmable to meet changing requirements of the customer, offering a wide range of protection features, such as tight load regulation, overvoltage and overcurrent protection, as well as thermal shut-down.

The MAX1875AEEG+ is a pulse-width modulation (PWM) switching controller for DC-DC converters. It provides a simple, yet comprehensive and highly efficient power management solution for applications with 1 to 5 V inputs. The device is designed for synchronous buck converter applications in which current mode control and constant on-time control are required.

Features of MAX1875AEEG+

The MAX1875AEEG+ is an integrated dual-channel PWM controller. It provides a complete DC-DC interface solution with high-efficiency, high frequency synchronous switching architecture and a wide range of protections and features.

The features of the MAX1875AEEG+ include:

• Wide input voltage range of 4.5 V to 45 V
• High switching frequency of up to 1MHz
• Power efficient output overtotal load range, up to 80mA
• Low EMI output noise with precise trim and sync.
• Programmable and adjustable output-voltage range of 2.5 V to 45 V
• Overvoltage, overcurrent, and thermal shut-down protections
• Low drop-in voltage for highest efficiency
• High accuracy output voltage and temperature control

Working Principle of MAX1875AEEG+

The MAX1875AEEG+ is a synchronous buck controller with a high-efficiency, zero voltage switching (ZVS) topology. The device utilizes a high frequency topology to maintain a low switching losses and provides a lower EMI noise output.

The MAX1875AEEG+ operates in constant-on-time (COT) mode, where the current regulator and the pulse-width modulator (PWM) set the on-time of the high-side switch which, in turn, controls the output voltage. The device provides internal functions such as overvoltage, overcurrent and thermal protection.

The device incorporates a voltage feedback loop with external resistive dividers to set the output voltage, as well as a voltage-controlled frequency reduction feature to provide output voltage regulation in light load conditions. The 10-bit ADC monitors the input voltage and enables the controller to regulate the output voltage precisely over the entire load range.

The MAX1875AEEG+ is suitable for a wide range of power management applications, including laptops and tablets, industrial systems, consumer products, data communications and test and measurement equipment.

Conclusion

The MAX1875AEEG+ is a highly efficient and configurable DC-DC switching controller designed to provide a comprehensive and performance-enhanced solution for powering mobile communications, industrial and other high-voltage systems. It features a low drop-in voltage, wide input voltage range and high switching frequency, as well as a range of protection features, such as tight load regulation, overvoltage and overcurrent protection, and thermal shut-down. The device is suitable for a wide range of power management applications, including mobile devices and industrial systems.

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