ISL95855AIRTZ

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ISL95855AIRTZ Application Field and Working Principle

The ISL95855AIRTZ is a precision micropower shunt regulator specifically designed for power sensitive mobile or battery-powered applications. This device uses integrated MOSFET technology and a proprietary bandgap reference to give superior noise and performance characteristics compared to discrete solution solutions. The ISL95855AIRTZ is ideal for meeting a variety of ultra-low power, high-accuracy power management requirements.

Applications

The ISL95855AIRTZ is suitable for a variety of power management solutions including, but not limited to the following list:

• Mobile phones and portable devices
• Wireless transmitters and receivers
• Tracking, Indoor/Outdoor positioning, and surveillance systems
• Adult/Kids toys and educational tools
• Health and medical devices/equipment
• Home Automation systems
• Building Automation systems
• Home gateways
• Battery-powered systems

Device Features

The ISL95855AIRTZ provides the following features and benefits:

• Ultra-low quiescent current and high efficiency
• True low dropout performance through integrated MOSFET
• High precision regulation for battery powered applications
• Good load transient performance
• Enhanced line transient protection

Working Principle

The ISL95855AIRTZ is a high-performance micropower voltage regulator specifically designed for power sensitive applications where low power consumption and high precision are critical. This device integrates a low RDS(on) MOSFET, an on-chip voltage reference, and a low noise, linear charge pump to provide stable and accurate output voltage regulation.

The ISL95855AIRTZ begins regulating when the differential voltage across its input pins is greater than the device’s minimum required headroom. This allows the device to operate fully in the low dropout region, resulting in excellent power savings, high efficiency, and good load and line transient performance. The linear charge pump generates the gate drive required to turn on and off the MOSFET, maintaining the output voltage at its reference. The integrated voltage reference ensures excellent accuracy through temperature and input supply variations.

The ISL95855AIRTZ is designed to meet the extreme power requirements of the mobile phone market. The device provides low quiescent current and offers a wide input voltage range combined with excellent load regulation and line transient protection. This makes it the ideal choice for a variety of power management requirements.

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