MAX1865TEEP+T

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MAX1865TEEP+T Application Field and Working Principle

MAX1865TEEP+T belongs to the category of PMIC (Power Supply Controllers, Monitors) and is developed by Maxim Integrated. This device is a three-LUT voltage regulator that provides adjustable output voltage using in-system current programming. It essentially enables engineers to use only one regulator for various applications having different output voltages.

Features

The MAX1865TEEP+T features a wide input voltage range, low quiescent current of only 15µA, programmable soft start that supports low-loss startups at ≤6 mA, and an adjustable over-temperature comparator with an adjustable trip threshold with a hysteresis of ±2°C. This device provides protection against over-voltage, over-current, under-voltage and short-circuit conditions.

The MAX1865TEEP+T features an adjustable output voltage range of 0.7V to 1.9V with 6-step resolution and is available in 10-pin or 5-pin configurations with a strong bypass capability supporting up to 4.5A at 30V. This device is AEC-Q100 Grade 0 qualified and is ideal for automotive applications and other harsh environment applications.

Schematics

The MAX1865TEEP+T comprises a comparator, voltage reference, voltage programming pins, a precision reference, and a three-LUT level regulator. The three-LUT level regulator is used in multiplexing the voltage using three resistors and is shown in the below figure.

Working Principle

The voltage programming pins (VP1 and VP2) control a digital potentiometer (digital pot). The VP2 pin is connected to a node between the two resistors. A Single-pole Double-throw (SPDT) switch is connected between the end of the first resistor and the wiper of the digital pot. A buffer is connected between the wiper and the other end of the second resistor. Depending on the resistance variation of the two resistors, the output voltage (V(OUT)) is varied. Thus, the output voltage is programmed with the VP1 and VP2 pins.

The voltage programming pins are connected to 6-bit registers which can be programmed. The 6-bit registers, in turn, control the resistance ratio of the two resistors through the digital pot. The current passing through the Node can be controlled by either increasing or decreasing the resistance, and thus the output voltage is controlled. The output voltage is a result of the ratio of the two resistors and is dependent on the current passing through the Node.

Conclusion

The MAX1865TEEP+T is a versatile and user-friendly three-LUT level regulator that enables engineers to use only one regulator for various applications with different output voltages. This device provides a wide input voltage range, low quiescent current, and programmable soft start, making it an ideal solution for harsh environment applications such as automotive applications and other harsh environment applications.

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