ISL9021IRU4Z-T

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The ISL9021IRU4Z-T is a single-output fixed linear voltage regulator from the Renesas ISL9021A series. It provides a fixed output voltage of 3.3V with a maximum continuous output current of 250mA. The device operates within an input voltage range of 1.5V to 5.5V and features a typical dropout voltage of 250mV at full load. It maintains a low quiescent current of 50µA and offers high power supply rejection ratio (PSRR) performance. The unit is housed in a compact 6-UTDFN package measuring 1.6mm x 1.6mm, suitable for space-constrained surface-mount applications.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrated protection circuitry including overcurrent, thermal shutdown, reverse polarity, short-circuit, and soft-start capabilities
• High power supply rejection ratio (PSRR) combined with low output noise for sensitive analog loads
• Low quiescent current consumption to extend battery life in portable devices
• Fixed output voltage configuration eliminates external feedback resistor requirements

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Portable consumer electronics requiring stable low-noise power rails
• Battery-powered systems utilizing low-dropout regulation
• RF modules and sensor interfaces demanding high PSRR
• Embedded control circuits within mobile communication devices

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to potential counterfeit risks. Confirm RoHS compliance status and specific lot traceability before integration into production. Check for end-of-life notices or obsolescence alerts as availability may be limited. Ensure proper handling procedures are followed during storage and assembly to maintain device integrity.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 3.3V rail is required with minimal external components. Consider the 250mA current limit against peak load demands. Evaluate the 6-UTDFN footprint against available PCB real estate. Verify that the input voltage range aligns with the system's supply characteristics. Assess thermal dissipation requirements based on ambient temperature and load conditions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the ISL9021A family of low-dropout regulators designed for low-power applications. The series includes various output voltage options and packages. Renesas Electronics Corporation manufactures this line, continuing the legacy of Intersil power management solutions. The ISL9021A series is characterized by its balance of low noise, high PSRR, and small form factor.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Consult official datasheets for pin-compatible alternatives within the ISL9021 series or newer generations. Verify electrical parameter equivalence for output voltage, current capacity, and dropout voltage. Review updated feature sets such as enhanced protection mechanisms or improved efficiency metrics. Ensure mechanical compatibility with existing board layouts and soldering profiles.