ISL78208ARZ-T

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The ISL78208ARZ-T is a 3A ultra-low quiescent current DC/DC step-down switching regulator. The device is designed to deliver a regulated output over a wide input voltage range of 2.30 V to 5.5V (6.5V Absolute Maximum) and can source up to 3A of load current, with very low quiescent current of 4uA. The device has a wide switching frequency range from 0.5MHz to 4MHz, allowing designers to optimize the balance between efficiency and external size. The ISL78208ARZ-T integrates a 0.95V accurate voltage reference. Settings are adjustable through the use of an external resistive divider. This divider can be connected directly, or through a R-2R network to allow very precise voltage output down to 0.5% accuracy.

The ISL78208ARZ-T is a synchronous step-down converter, with internal power MOSFET, high-side MOSFET drive and high-side current sensing circuit. It is ideal for use in applications such as home appliances, industrial equipment, computers, medical devices, and telecommunication systems. Its wide frequency range and low quiescent current make it ideal for low power or portable designs, providing high efficiency and low noise during operation.

The switching regulator can operate from a wide input voltage range of 2.30V to 5.5V and output currents up to 3A. It has an adjustable switching frequency range from 0.5MHz to 4MHz, allowing designers to optimize the system efficiency and size by selecting the right operating frequency. The pulsed DC/DC converter is designed to provide a regulated output in the range of 0.6V to 4.3V, with a 0.95V accurate voltage reference allowing very precise voltage setting down to 0.5% accuracy.

In order to regulate the output voltage accurately, the ISL78208ARZ-T uses an external resistive divider connected to the FB pin. This allows the output voltage to be accurately set over the full input voltage range. To provide further output voltage accuracy and the ability to adjust the output voltage without the need for a resistive divider, a resistor-to-resistor (R-2R) network can be used instead of the external resistive divider. The output voltage can also be enabled or disabled using the EN pin.

The ISL78208ARZ-T has an internal power MOSFET which allows for fast and efficient power conversion. The device includes a high-side MOSFET driver and high-side current sensing which allows the device to sense the current at the output of the power MOSFET, enabling accurate over-current protection and thermal protection to shut down the device in case of short-circuits or thermal overload. The device also has a frequency foldback circuit to protect the power MOSFET and reduce power dissipation at higher current levels. The switching frequency can be synchronized with an external clock source, enabling the device to use multiple regulators in synchronous mode.

In conclusion, the ISL78208ARZ-T is an advanced, compact and versatile step-down switching regulator. It can deliver up to 3A of continuous output current, with an extremely low quiescent current enabling it to be used in low-power or portable designs. Its wide input voltage range and adjustable switching frequency make it suitable for a range of applications, and its integrated features provide high precision voltage regulation and over-current protection.

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