S-817B49AY-B2-U

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The S-817B49AY-B2-U belongs to the Voltage Regulators - Linear category of PMICs (Power Management ICs). PMICs help to protect, manage and measure power in electronic systems or circuits. Linear voltage regulators regulate output voltage in a linear way to maintain the output voltage within a specified tolerance range irrespective of pressure variations or fluctuations in the load current. Regulated DC output is obtained from the input source if it is within the specified voltage. The S-817B49AY-B2-U is an adjustable voltage regulator used for supplying adjustable power to the target system or application.

The S-817B49AY-B2-U was designed with a low quiescent current. It uses a N-channel MOSFET as its main unit and includes a precision current limiting circuit to prevent overcurrent due to application faults or other transient conditions. It has a wide operating voltage range of 2V to 6V and can provide a regulated output of 1.2V to 16V with a maximum output current of 480 mA.

On-chip control circuits optimize the voltage regulation loop and allow the S-817B49AY-B2-U to achieve a low output voltage ripple and low quiescent current. It is also equipped with a power save mode, a thermal shut-down mode, as well as an over temperature and over current protection to keep the system secure. Overall, the S-817B49AY-B2-U was designed with a low quiescent current and excellent line and load regulation performance for the target application.

Overview of the S-817B49AY-B2-U Working Principle
The S-817B49AY-B2-U is based on a voltage feedback architecture which is used to provide a stable output voltage. The architecture consists of a voltage reference, an error amplifier, a PLL and a voltage feedback circuit. The voltage reference provides an accurate reference voltage. The error amplifier compares the voltage reference with the output voltage and provides an error signal which is amplified and sent to the PLL. The PLL will then generate a control signal to regulate the output voltage of the regulator. The voltage feedback circuit gives the output voltage to the error amplifier which will then adjust the control signal of the PLL accordingly.

The S-817B49AY-B2-U is equipped with a power save mode. When the load current is lower than a set threshold, the power save mode can reduce the quiescent current of the IC. There is also an over temperature and over current protection, which can protect the system from safety issues. In addition, the S-817B49AY-B2-U has a shutdown mode which can disconnect the power path from the output when the supply voltage is removed.

Applications
The S-817B49AY-B2-U is applicable for a wide range of applications, such as motor control circuits, laptop adapters, portable devices, battery powered systems, and embedded systems. It is also suitable for applications where current limiting protection and tight line and load regulation are required. Since the S-817B49AY-B2-U is adjustable, it can be used with transformers of different ratings to provide an adjustable output voltage of 1.2V to 16V.

Conclusion
The S-817B49AY-B2-U is a versatile and reliable adjustable voltage regulator. It can provide an adjustable output voltage of 1.2V to 16V with a maximum output current of 480mA. It is equipped with a power save mode, a thermal shut-down mode, as well as an over temperature and over current protection to keep the system secure. The S-817B49AY-B2-U is applicable for a wide range of applications, such as motor control circuits, laptop adapters, portable devices, battery powered systems, and embedded systems. Overall, it is an ideal choice for applications that require a reliable and adjustable voltage regulator.

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