ISL8845AABZ

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ISL8845AABZ Application Field and Working Principle

The ISL8845AABZ is an adjustable switching current/voltage (V/I) regulator designed for power management in portable applications. ISL8845AABZ belongs to Power Management ICs (PMICs) Voltage Regulators, and DC DC Switching Controllers. This article will briefly explain its application field and working principle.

Application Field

The ISL8845AABZ is a low cost and low power voltage/current regulator designed for use in portable applications, such as handheld electronics, laptops and other medium to high current portable applications. It is specialized for high current precision V/I regulation. It is designed for superior performance in closed loop systems and for operations under high noise, strained conditions. It is an ideal regulator for charging batteries and stabilizing power supplies.

Working Principle

ISL8845AABZ is a self-contained voltage/current regulator which provides high accuracy adjustable current and voltage regulation with minimal external components. The device integrates two error amplifiers and two comparators, providing a fully adjustable output voltage and current. The voltage/current is controlled via external resistor divider and sensed externally. The device also integrates a bias voltage generator which allows the user to accurately adjust the output voltage level. The device can be operated in auto-detecting or hardwired voltage/current source mode.

When operating in auto-detecting mode, the device will automatically detect and set the output voltage depending on the resistor divider connected to the senses. In this mode, the user can program the maximum current limit and the output voltage level with external components. In the hardwired voltage/current source mode, the user can set the internal voltage/current thresholds and the maximum current limit with external components. The device will select the optimal output voltage and current based on the sensed resistance. The device also supports basic sequencing and sequencing with pre-defined timing.

Conclusion

ISL8845AABZ is a low cost and low power voltage/current regulator designed for portability. It integrates two error amplifiers and two comparators for accurate control of V/I operation and is ideal for battery charging and power supply regulation in portable applications. It can be operated in either auto-detecting or hardwired voltage/current source mode. With minimal external components and using either hardwired or auto-detecting modes of operation, it can provide versatile voltage and current regulation.

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