ISL8845AAUZ-T

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Integrated Systems Laboratories’ (ISL) 8845AAUZ-T is a DC/DC switching controller designed for use in applications requiring a voltage regulator or other power management functionality. It is a 4-channel expansive DC/DC switching controller, with low-power CMOS process. It uses a proprietary feedback scheme for fast response, great efficiency and minimal start up power. It is designed for 2-to-4 terminal applications and allows the adjustment of voltage, current and frequency without the need for external components.

Features

• Wide input supply range of 2.7V to 14V
• Output voltage range of 0.55V to VIN
• Output current of up to 5A
• Power good indicator
• Precision 0.25% output voltage accuracy
• Programmable switching frequency of up to 750kHz
• Low current shutdown mode (<1uA)
• Current-mode control
• Soft-start or adjustable output voltage ramp rate
• Built-in 5.05 fixed output voltage option
• Rich selection of protection features

Application Field

The ISL8845AAUZ-T has a wide range of applications. It is used in automotive and industrial applications, as well as consumer electronics and portable computing. The ISL8845AAUZ-T is ideal for applications such as: motor control, cellular telephone and base station power supply, ac/dc adapters, telecom, notebook and desktop personal computers power supplies, USB power supplies, CCD cameras, cordless phone power supply, and radio frequency applications.

Working Principle

The ISL8845AAUZ-T follows the current-mode control principle. This simply means that the integrated controller regulates the output voltage or current by controlling the on-time of an internal or external switch. The feedback signal is stricly proportional to the output, so the regulation of the output is related to the control signal. The outputs are regulated by setting an internal reference and an input signal. When the voltage or current reaches the internal reference level, the controller reduces the output parameters and prevents it from going over/under the desired amount.

The ISL8845AAUZ-T has an adjustable voltage and current limiting, which helps prevent excessive load currents. This is accomplished by setting the peak current limit and the peak voltage limit. When either limit is reached, the controller throttles back on output power until the limits are reset. This feature enables the device to function in applications where the load current or voltage can fluctuate. Additionally, the ISL8845AAUZ-T offers a wide range of protection features such as over and under voltage protection, current sense and foldback protection, thermal protection and more.

Conclusion

The ISL8845AAUZ-T is a versatile and feature-rich switching controller designed for a wide range of applications. It is easy to use and requires no external components for operation. Its wide range of protection features make it ideal for variable load applications. The adjustable voltage and current limiting allow for in-depth power management, while its wide input range and low power consumption make it a perfect choice for portable and low power applications.

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