ADM7172ACPZ-3.3-R7

The ADM7172ACPZ-3.3-R7 is a low noise, high PSRR voltage regulator optimized for battery-powered systems. It is aimed at portable applications such as consumer electronic devices and mobile phones. It integrates an adjustable output voltage ranging from 0.6V to 5.5V and a 3.3V voltage reference to provide an ultra-low quiescent current output of just 11.5µA. The low dropout voltage of the ADM7172ACPZ-3.3-R7 can be as low as 0.18V at light loads, extending the battery life of consumer electronics applications.

Aside from its low quiescent current and low dropout, the ADM7172ACPZ-3.3-R7 also features excellent power supply ripple rejection (PSRR) and low noise output (20μVrms). This makes it ideal for powering sensitive analog circuits and low-voltage digital logic. It is compatible with a wide range of load capacitors, from 1µF to 1µF, ensuring stable output over temperature and line variations.

The ADM7172ACPZ-3.3-R7 provides a power-good monitor for adaptive voltage scaling and supports output current up to 3A, making it ideal for powering high-current pulses. It is offered in a 5-pin, SOT-23-5 package, and supports a wide operating temperature range from -40°C to 125°C.

Application

The ADM7172ACPZ-3.3-R7 is well suited for consumer electronics, digital and analog systems, low-power portable devices, and other applications that require a low quiescent current and low noise output. It can provide power to low-voltage logic circuits, microcontrollers, digital signal processors, and analog circuits.

The combination of high PSRR, low quiescent current, and low dropout voltage of the ADM7172ACPZ-3.3-R7 make it ideal for extending battery life in portable applications, allowing the system to run longer on a single charge. The maximum output current of 3A also makes it suitable for powering high-current pulses, such as LED lighting and display drivers.

Working Principle

The ADM7172ACPZ-3.3-R7 is a linear voltage regulator. It operates on the principle of an error amplifier that compares the output voltage with an internal reference voltage. When the output voltage falls below the reference voltage, the error amplifier will increase the feedback loop gain and increase the output current. This causes the output voltage to rise until it is in line with the reference voltage.

The regulator will then maintain this output voltage to provide a stable supply to the load. At the same time, it will continuously monitor the output voltage and adjust the output current as needed. This allows the ADM7172ACPZ-3.3-R7 to provide a highly efficient, low noise, and low dropout voltage solution.

The ADM7172ACPZ-3.3-R7 also features a power-good/enable function which allows the system to automatically detect whether the output voltage has exceeded the specified tolerance and to adjust the output accordingly. This allows the device to dynamically adjust the output voltage in response to changes in temperature and line voltage.

The ADM7172ACPZ-3.3-R7 is RoHS compatible and is available in a 5-pin, SOT-23-5 package. It is an ideal solution for powering low-voltage analog and digital circuits in portable and battery-powered applications.

Conclusion

The ADM7172ACPZ-3.3-R7 is a low noise, high PSRR linear voltage regulator that is optimized for battery powered applications. It integrates an adjustable output voltage ranging from 0.6V to 5.5V, a 3.3V voltage reference, and a low quiescent current output of only 11.5µA. The ultra-low dropout voltage of 0.18V and the 3A maximum output current allows it to be used in a wide range of load conditions. The device also supports a wide operating temperature range from -40°C to 125°C and offers excellent power supply ripple rejection and low noise output.