MAX689CSA

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MAX689CSA is a low-dropout fixed and adjustable linear regulator integrated chip produced by Maxim Integrated. It is one of the most popular and reliable linear regulators used in the field of power management integrated circuits (PMIC). In this article, we will discuss the practical applications of MAX689CSA and its working principle.

Application Field:

MAX689CSA is most common for applications in low-voltage and medium-voltage systems, including but not limited to wireless communication board, GSM/GPRS module, automation, LCD screens, routers, automotive ECUs and other multi-purpose circuits. It is also used for small and medium adjustable voltage applications.

The device is ideal for providing a power supply for various microcontrollers and digital circuits, because it has a low dropout voltage, low supply current and low quiescent current. With a wide input voltage of 1.8V~20V, it can accurately regulate an output voltage of 0.8V~16V at an output current of up to 800mA. With accurate load regulation and low dropout voltage, MAX689CSA ensures high efficiency and excellent performance in mobile applications.

The low supply current of MAX689CSA, 1.5mA(max) makes it suitable for system level battery management. It\'s high-side current sense amplifier enables accurate input current measurement for battery protection. The dense integration also makes for a small form factor, which is perfect for portable systems and low-power, low-voltage applications.

Working Principle:

MAX689CSA is an ideal low-dropout linear voltage regulator with a wide input voltage range of 1.8V~20V and a maximum output current of 800mA. The device is composed of an operational amplifier and P-channel MOSFET. It works on the principle of negative feedback.

When the input voltage is higher than the output voltage, the operational amplifier feeds the difference between both the voltage back to the gate of P-channel MOSFET and the circuit will enter into linear operating range. This reduce the voltage drop across the MOSFET and as a result, the output is successfully regulated to the desired dc level.

MAX689CSA comes with internal current limit and low dropout voltage, which are set via configuration pins or an external resistance. An internal thermal shutdown can be called if the die temperature reaches 140℃. This helps protect the device by shutting off the output until the temperature falls down to 120℃.

Conclusion:

MAX689CSA is one of the most reliable low-dropout linear regulator in the market. With a wide input voltage range of 1.8V~20V and a maximum output current of 800mA, it is widely used for medium voltage applications and small to medium adjustable voltage purposes. It provides high accuracy, low quiescent current and low dropout characteristics for superior performance. With its highly integrated functions, it makes for a small footprint that is perfect for portable systems, low-power and low-voltage applications.

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