AD688BQ

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IntroductionVoltage references provide a constant reference voltage to ensure most accurate operations of analog circuits. It is also used in power supply systems, so that power supplies can remain stable and reliable.The AD688BQ is a specialized voltage reference from Analog Devices, which is designed for portable applications with power management. It features an extremely low power consumption of 105µW. The AD688BQ has an adjustable output voltage range from 0.8V to 5V, and can output up to 1.2A of current.Overview of AD688BQThe AD688BQ is a high performing voltage regulator with a unique architecture. It includes an ultra-low power mode. This mode allows the regulator to maintain low power dissipation and an extended battery life. Additionally, it boasts fast transient response and a stable voltage output.It includes a low dropout voltage, which means that the output voltage is adjustable over a wide range. The AD688BQ also features a high efficiency rating of 98.5%, which ensures its long-term reliability. Other features include a shutdown mode for efficient power management, thermal shutdown, over-voltage protection, and over-current protection.Application Fields of AD688BQThe AD688BQ is designed for use in portable applications with power management. It is suitable for mobile phones, handheld medical equipment, remote sensing systems, and numerous other mobile applications. It can also be used in systems requiring a low power supply with a wide output voltage range.The AD688BQ is used in many power supply circuits. It is particularly useful in applications where noise tolerance, low power consumption, and wide output voltage range are critical. Some examples of such applications include low-power microwave ovens, digital media players, and portable game consoles.Working Principle of AD688BQThe working principle of the AD688BQ is quite simple. It uses integrated voltage regulation circuitry to provide a stable output voltage and a low power consumption.The AD688BQ has a PNP configuration and requires a positive feedback to maintain the output voltage. It uses a control loop to monitor the voltage and make necessary adjustments, such as adjusting the output current. The resulting feedback will cause the circuit to return to the stable output voltage.The voltage reference maintains the output voltage by adjusting the current flowing through the external load with an active dropping resistor. This means that the output voltage is adjusted by changing the resistance of the dropping resistor. The current is also monitored to prevent over-current, over-voltage, and thermal shutdown.ConclusionThe AD688BQ is a specialized voltage reference from Analog Devices, which is designed for portable applications with power management. It features an extremely low power consumption of 105µW and an adjustable output voltage range from 0.8V to 5V. It is suitable for mobile phones, handheld medical equipment, remote sensing systems, and numerous other mobile applications. The working principle of the AD688BQ is quite simple and it uses a control loop to monitor the voltage and make necessary adjustments.

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