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PMIC - Voltage Regulators - DC DC Switching Regulators

The ISL8018IRAJZ-T is an integrated power converter and voltage regulator IC. It is typically used as an output voltage regulator in applications involving high levels of digital circuitry, and acts as a DC-to-DC voltage converter, converting the DC output voltage from a battery or other source to the voltage levels required by the connected digital circuit.

Application

The ISL8018IRAJZ-T is ideal for applications such as low-voltage digital systems, computing systems and portable medical equipment. It offers fixed output voltages of 1.8V, 2.5V, 3.3V and 5V, as well as adjustable output voltages from 1.2V to 6V. It provides a high-efficiency, low-noise solution for power management and voltage regulation in portable or low-power applications. It also contains over-voltage and over-current protection to ensure the safe operation of any system.

Working Principle

The ISL8018IRAJZ-T is based on a DC-DC switching topology. Its core consists of two stages: a high-efficiency P-Channel MOSFET (PMOS) buck converter as its first stage and a low-dropout (LDO) linear regulator as its second stage. The PMOS buck converter receives an input voltage and provides a regulated output voltage through an external inductor. The LDO in the second stage then takes this regulated voltage and provides the desired voltage output with low noise and high accuracy.

The IC supports different output voltage settings, allowing for versatility in design. The switching frequency is set by an external resistor and is programmable in the range of 500 kHz to 2.2 MHz. For applications where the power requirements are constantly fluctuating, the IC provides internal soft-start and synchronization features. The IC also contains two enable pins, enabling individual control of the buck converter and the LDO.

Features

• Multiple fixed output voltage versions (1.8V, 2.5V, 3.3V, 5V)
• Adjustable output voltage settings (1.2V to 6V)
• High efficiency
• Low noise output
• Programmable switching frequency (500kHz to 2.2 MHz)
• Internal soft-start and synchronization
• Thermal shutdown/current limiting/over-voltage protection
• Integrated FETs for easy layouts
• Small package size

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