MAX8805ZEWEEE+

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Introduction

MAX8805ZEWEEE+ is a voltage regulator that is part of the MAX series from Maxim Integrated. It is a special purpose regulators and has advantages including low power consumption, excellent noise immunity, and an extended adjustable output voltage range from 0.9 V to 5.5 V. The device can also be used to achieve more precise voltage regulation in low-power and high-frequency applications. This paper will discuss the application fields and working principle for MAX8805ZEWEEE+.

Application Field

The MAX8805ZEWEEE+ is mainly used for high-frequency, low-power applications such as current limiting logic and SOC platforms. It is also suitable for designs with tight load regulation requirements, particularly when the input voltage range is ±5% or more. The device is capable of supporting up to 400mA output current, making it ideal for low-power applications such as embedded systems, HDD, SSD and peripherals.

The MAX8805ZEWEEE+ is useful for applications in the automotive and industrial sector due to its extended operating temperature range. The device is also suitable for battery-powered applications as its low quiescent current ensures low power drain when battery voltage is low. In addition, the device’s low drop-out voltage ensures that the battery voltage is well regulated so that the device output remains stable.

Working Principle

The MAX8805ZEWEEE+ is a voltage regulator designed to provide a highly accurate, low noise adjustable voltage output with input voltage range of 2.7 V to 5.5 V. The device contains an internal bandgap reference, two error amplifiers, a voltage divider and two MOSFET drivers.

The DC-DC regulator operates in one of two modes; Constant Voltage (CV) mode and Constant Current (CC) mode. In CV mode, the voltage of the output pin is set to a certain reference voltage, based on the external resistor divider connected to the VREF pin. The error amplifier will then monitor and adjust the voltage of the output pin to maintain the set reference voltage.

In CC mode, the output pin is set to a certain current limit based on the external resistor connected to the ILIM pin. The error amplifier will then monitor and adjust the current of the output pin to maintain the set current limit. In either mode, the MOSFET drivers will regulate the output current to maintain the desired output voltage or current limit.

Conclusion

The MAX8805ZEWEEE+ is a special purpose voltage regulator designed for high-frequency, low-power applications. It has advantages such as low power consumption, extended temperature range, and an adjustable output voltage range from 0.9 V to 5.5 V. The device is suitable for designs with tight load regulation requirements. The DC-DC regulator operates in either constant voltage or constant current mode, based on the external resistor divider connected to the VREF pin or ILIM pin.

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