ISL91110IIAZ-T

Introduction

The ISL91110IIAZ-T is a DC/DC switching regulator module from Intersil. It is a highly-integrated, low-input voltage, fixed-frequency synchronous step-down switching regulator that supports single-stage buck conversion and includes a high-current Power-MOSFET. Operating over a wide input voltage range from 3.2V to 60V it is ideal for automotive, industrial and telecom applications requiring robust performance and high-accuracy. It is scalable for multiple higher-current outputs with low quiescent current and low EMI. The ISL91110IIAZ-T supports both pulse width modulated (PWM) and pulse frequency modulation (PFM) control.

Application Field

The ISL91110IIAZ-T DC/DC switching regulator is a versatile power conversion device suitable for multiple applications. It is widely used in automotive, Industrial, Telecom, and consumer applications requiting conversion from voltages ranging from 3.2V to 60V to outputs ranging from 0.5V to 3V. Automotive applications include LCD displays, HVAC control systems, Automotive supply systems and body electronics. Industrial applications include UPS systems, Variable speed drives, DC-DC converters, and power over Ethernet solutions. Telecom applications include WiMAX and LTE systems, RF transceivers, cellular base stations and network switches. Consumer applications include portable electronics, aviation power sources, and power over Ethernet systems.

Working Principle

The ISL91110IIAZ-T DC/DC switching regulator module works by taking the input voltage and transforming it into a lower output voltage using a high-current MOSFET switch and inductor. The regulator can be configured to operate in either pulse width modulation (PWM) or pulse frequency modulation (PFM) modes. In PWM mode, it operates in fixed frequency, whereas in PFM mode, the output voltage is controlled via frequency modulation.The ISL91110IIAZ-T can also be configured to operate in multiple-phase mode, allowing multiple modules to be connected in parallel to increase the output current. In this configuration, the modules are synchronized and the output current limit is increased.The module also includes a power control logic block that provides additional features such as overload protection, over voltage protection, under voltage protection and over temperature protection. The module also includes a current sense block for dynamic load regulation.

Conclusion

The ISL91110IIAZ-T is a highly integrated, low-input voltage, fixed-frequency synchronous step-down switching regulator from Intersil. It is suitable for multiple applications that require conversion from high input voltages ranging from 3.2V to 60V to outputs ranging from 0.5V to 3V. It supports both PWM and PFM control, and can be configured to operate in multiple-phase mode, allowing multiple modules to be connected in parallel for increased output current. It also includes power control logic for additional features, and a current sense block for dynamic load regulation.