ISL95831AHRTZ

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ISL95831AHRTZ Application Field and Working Principle

The ISL95831AHRTZ is a special purpose voltage regulator and is part of the comprehensive PolarPOWER family of voltage regulators from Intersil. It is a highly integrated, high accuracy floating linear regulator that is suitable for a broad range of applications and is manufactured on a high-performance CMOS process. Its feature set and product support provide designers with the flexibility necessary to precisely generate any voltage from 1.5 V to 12 V.

Applications

The ISL95831AHRTZ is intended for a range of applications including mobile phone, automotive, consumer, industrial, server, and communications systems. Its features include high accuracy and low quiescent current, enabling designers to accurately generate a wide variety of output voltage levels. Its integrated digital soft-start and sequencing controllers also provide robust startup and fault protection. With a wide input voltage range, the ISL95831AHRTZ can be used in 5 V to 12 V systems. Its soft-start controller, programmable slew rate, digital current limit, and thermal protection enable it to protect itself and systems against overcurrent faults.

Working Principle

The ISL95831AHRTZ is a floating linear voltage regulator which uses an error amplifier and a pass element to regulate the output voltage. The regulator has a PWM-type architecture and uses a pulse-width modulation (PWM) signal to adjust the amount of time the pass element is on. The error amplifier senses the output voltage and adjusts the PWM as needed to keep the output voltage stable. The pass element is a low on-resistance, high-frequency power switch. It is turned on and off based on the PWM signal from the error amplifier.

The core of the ISL95831AHRTZ is its power switch. The power switch includes built-in current sense resistors, so it can monitor and limit the current draw of the system. It also includes a temperature sensing element which can detect when the temperature of the system is too high and will shut off the power switch to prevent any damage. Additionally, the power switch includes a soft-start circuit which gradually increases the output current upon start-up to reduce inrush current spikes.

Conclusion

The ISL95831AHRTZ is a highly integrated, high accuracy, floating linear voltage regulator that is suitable for a broad range of applications. Its features include high accuracy and low quiescent current, enabling designers to accurately generate a wide variety of output voltage levels. Its integrated digital soft-start and sequencing controllers provide robust startup and fault protection. Furthermore, its built-in temperature sensing element and soft-start circuit protect the system from overcurrent and inrush current spikes.

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