MAX1681ESA+T

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MAX1681ESA+T Application Field and Working Principle

The MAX1681ESA+T is a DC-DC switching regulator that has the capability of regulating both voltage and current. It is designed to be used in applications where a high efficiency power supply is needed, such as portable electronics, A/V gear and battery-powered systems. The MAX1681ESA+T is capable of delivering up to 3A of continuous output current at up to 10V.

Features and Applications

The MAX1681ESA+T has a range of features which benefits users, including a low current consumption in shutdown mode; wide input voltage range, and 180kHz fixed-frequency operation for low acoustic noise. It also has a low voltage dropout voltage and is constructed using SOT23-6 package which is small in size, making it suitable for portable applications.

The MAX1681ESA+T is perfect for applications such as portable electronics (laptop adapters, PDAs, music players and gaming consoles), as well as VCC, in-system and motor vibration motor control and power supply systems. It is also ideal for battery-powered systems as well as A/V gear, such as Televisions, DVD-players, set-top boxes and home theatre equipment.

Working Principle

The MAX1681ESA+T is a step-down switching regulator that works in phases. The first phase is the power stage and involves the conversion of the input voltage to the output voltage. During this phase, the input voltage is transformed into an output voltage via a buck-converter. This is achieved by using an external MOSFET and an inductor to produce the required output voltage.

Next is the control phase where the output voltage and current are regulated. This is done via a control loop which consists of an error amplifier, a comparator and an internal gate driver. The error amplifier compares the output voltage, and the reference voltage from the feedback resistor with the internal reference, and then outputs a voltage which is controlled by the transconductance level of the external MOSFET. This output voltage is then compared to the current limit threshold which is set by the current limit resistor.

Finally, the switching phase is where the MOSFET is turned off and on to control the output voltage and current. This is done by comparing the voltage and current limit threshold signals to the control voltage. If the control voltage is above the set threshold then the MOSFET will be turned off, whereas if it is below the threshold then the MOSFET will be turned on. This process is repeated and regulated to ensure that the output voltage and current remain stable.

Conclusion

The MAX1681ESA+T is a powerful DC-DC switching regulator that can provide up to 3A of continuous output current, making it suitable for a wide range of portable electronic devices. It is constructed in a small SOT23-6 package and has low current consumption in shutdown mode. Furthermore, it has a wide input voltage range and a low voltage dropout voltage. With these features, the MAX1681ESA+T is an ideal choice for portable electronic applications, as well as motor vibration motor control and A/V gear.

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