BU4551B

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BU4551B is an N-Channel analog switch integrated circuit. It contains four switches, each of which can block up to 5 mA current, and has a low external component count by stacking the analog switches. The circuit provides maximum OFF leakage current of 1 pA and can handle supply voltages ranging from 3 V to 18 V. It is suitable for low-power applications, such as data communication and switching signals in digital audio systems.

The BU4551B has a logic-level control reed. When the control pin is set to low, the devices switches are open, and when the control pin is set to high, the devices switches are closed and a connection is made between sources and loads. The control signals must have a high logic logic and have a hysteresis of less than 0.9 V, which prevents accidental switching caused by temporary voltage fluctuations.

BU4551B can be broadly used in many fields, such as cell phones, tablet PCs, shared power supplies, and air-conditioners. In cell phones, it can be used as an interrupt switch. In tablet PCs, it can be utilized as an analog switch to control system audio signals. In shared power supplies, it is possible to control the power supply to different load circuits. In air conditioners, BU4555B can be used as a fan speed control circuit to maintain airflow and reduce noise.

BU4551B has low power consumption, wide operating voltage range, and high performance. It offers high input impedance, low source-drain ON resistance, low OFF leakage current, and fast switching times, as well as excellent ESD protection for its switches. Furthermore, it also offers robust operation against power supply fluctuations, making it an ideal choice for low-power and low-voltage analog applications.

The working principle of the BU4551B can be explained in a few steps. First, the logic-level control reed is used to switch the devices switches. By setting the logic-level control low or high, the state of the switches can be changed from open to closed or from closed to open. Second, when the switches are closed, the internal resistors are used to maintain a specified level of output resistance and limit the current flowing through the switches. Finally, the low and high levels of the signals are obtained by the input signals, and the output is generated.

In summary, the BU4551B is an N-Channel analog switch integrated circuit, which has many applications in the fields of cell phones, tablets, shared power supplies, and air-conditioners. It offers wide input impedance, low source-drain ON resistance, low OFF leakage current, and fast switching times, making it an ideal choice for low-power and low-voltage analog applications.

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