ISL8002AIRZ-T13

ISL8002AIRZ-T13 Application Field and Working Principle

ISL8002AIRZ-T13 is a DC DC switching regulator provided by Intersil Corporation, a leading manufacturer of power management integrated circuits (PMIC). This switching regulator offers very low quiescent current and high power density operation while still delivering exceptionally low output noise and ripple. It is ideal for applications that require high efficiency and ultra-low current draw, such as portable electronic devices, battery-powered sensors, and automotive systems.

The ISL8002AIRZ-T13 switching regulator features a constant-frequency current-mode topology, which helps achieve low internal impedance and fast transient response. A proprietary spread spectrum technique is supported to reduce system-level noise. The switching regulator also employs a synchronous rectifier, which relieves the input power source from current stress and reduces switching losses, resulting in higher efficiency.

Typical Applications

• Cellular phones
• Digital still and digital video cameras
• Portable computers
• Cordless phones
• Hand-held GPS devices

Working Principle

The ISL8002AIRZ-T13 operates by regulating the voltage by switching on and off a power transistor that is controlling the output voltage of the system. The switching action is accomplished by modulating the current that is passed through the transistor. This current is controlled by the feedback voltage, which is compared to the voltage reference. When the feedback voltage and the voltage reference are equal, the power transistor is turned off and the current through it is zero. When the feedback voltage deviates from the voltage reference, the power transistor is turned on, allowing the current to pass through it.

When the feedback voltage is greater than the voltage reference, the power transistor is turned on and the current through it is increased, which increases the voltage output of the system. Conversely, when the feedback voltage is lower than the voltage reference, the power transistor is turned off, reducing the current through it and lowering the output voltage of the system.

The switching action of the ISL8002AIRZ-T13 also increases the efficiency of the system, since the energy losses associated with the transistor turning on and off are much lower than if the transistor were kept continuously on. Furthermore, the use of current mode control, which is implemented by this switching regulator, also helps enhance noise immunity and system stability.

Conclusion

In summary, the ISL8002AIRZ-T13 switching regulator from Intersil Corporation is designed for applications that require low quiescent current and power density, exceptional noise and ripple performance, and high efficiency. It uses the constant-frequency current-mode topology combined with synchronous rectification and a proprietary spread spectrum technique to provide an optimal solution for a wide variety of applications.