ADP1712AUJZ-2.5-R7

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ADP1712AUJZ-2.5-R7 Application Field and Working Principle

The ADP1712AUJZ-2.5-R7 is a negative linear regulator from Analog Devices, a leading semiconductor design and manufacturing company. It’s designed for low-noise, low-dropout current regulation applications in general purpose systems across multiple industrial and automotive platforms. It has a wide range of features that make it a great choice for a wide range of applications.

Specifications:

• Input Voltage: 4V to 36V
• Output Voltage: -2.5V
• Maximum Output Current: 1A
• Dropout Voltage: < 200mV
• Operating Temperature Range: -40°C to +125°C
• Reverse Current Protection: Built-in Active Clamp Output

Applications:

The ADP1712AUJZ-2.5-R7 provides the negative linear voltage regulation necessary for various applications, including:

• Positive to Negative Voltage Conversion
• Rail Splitting for Automotive Loads
• Battery-Powered Devices and Portable Electronics
• Telecom Equipment
• Industrial Equipment
• Automotive Applications

Working Principle:

The ADP1712AUJZ-2.5-R7 works by using a P-channel MOSFET in a linear regulation circuit, which provides 3V to 36V input voltages to the output at -2.5V. The voltage regulator comprises two transistors, one as the current source and the other as the voltage limiter. The current source is a P-channel MOSFET which serves as the pass element of the linear circuit, allowing an adjustable current to flow from the input source to ground. The output voltage is controlled by varying the gate-source voltage of the P-channel MOSFET, which adjusts the positive-bias current through the BJT linear regulator.

The output voltage is further regulated by a voltage divider circuit. This is a simple circuit comprising two resistors in series. The first resistor is connected between the input source and ground and has a value of R1. The second resistor is connected between the input source and the output voltage and has a value of R2. The output voltage is the R2 / (R1 + R2) fraction of the input voltage.

The ADP1712AUJZ-2.5-R7 also features a built-in active clamp output protection circuit, which turns off the output voltage when the reverse bias current reaches the protection limit. This provides protection from reverse current during automotive load transients.

Conclusion:

The ADP1712AUJZ-2.5-R7 is a negative linear regulator from Analog Devices that is designed for low-noise, low-dropout current regulation applications. It features a wide input voltage range, a maximum output current of 1A and a built-in active clamp output protection circuit. The regulator circuit consists of two P-channel MOSFETs and a voltage divider circuit, which together provide the necessary voltage regulation. It is suitable for numerous automotive and industrial applications, making it a great choice for general purpose systems.

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