S-817B25AY-Z2-U

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The S-817B25AY-Z2-U is a low-dropout (LDO) voltage regulator in the linear voltage regulators category and is manufactured by Sharp Corporation. This device is a fixed-output type LDO with an output voltage of 3.3V and a maximum output current of 400mA. In addition, it is designed to operate over a wide input voltage range of 4.5V to 16V. It has an on-chip temperature diagnostic circuit and soft-start circuit to protect against inrush current and overshoot current at power-on. Other features include built-in current limiting, over-temperature protection, reverse current protecting, and over-voltage protection.

The S-817B25AY-Z2-U is designed for electronic equipment that requires low quiescent current, low dropout voltage, high output accuracy, and high ripple rejection in low-voltage applications. It can be used in portable devices such as smartphones, tablets, and wearables, as well as automotive, industrial, and medical equipment.

The S-817B25AY-Z2-U is built with a CMOS process and is designed to be highly efficient and stable. It has a low quiescent current of 1μA and a low dropout voltage of 0.4V at a load current of 50mA. It also offers a wide operating temperature range of -40℃ to +125℃ and can operate at heatsink free ambient temperatures of up to +105℃ with 1W output power.

The device works by accepting the input voltage, VIN and applies a series of low-pass filters to reduce ripple and noise. The filtered signal is then sent to an error amplifier, which is used to compare VIN and the voltage at the output, VOUT. The output of the error amplifier is then sent to a P-channel MOSFET, which is connected to the output. When the output voltage needs to be increased, the error amplifier signals the P-channel MOSFET to open and let more current flow to the output.The P-channel MOSFET is controlled by a fixed duty cycle pulse-width modulation (PWM) signal from the controller, which works to limit the amount of current to the output.

The S-817B25AY-Z2-U comes in a tiny 8-pin SOP package and is designed for a variety of low-voltage applications that require low input current, low supply current, and low Dropout voltage. It is easy to use and occupies very little board space while offering high performance and long product life. The device is also RoHS compliant and Halogen free, making it an excellent choice for environmentally friendly applications.

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