ISL9021AIIKZ-T

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

The ISL9021AIIKZ-T is a single-output low-dropout (LDO) linear voltage regulator manufactured by Renesas Electronics Corporation. It provides a fixed output voltage of 2.85V with a guaranteed continuous output current of 250mA. The device operates within an input voltage range of 1.5V to 5.5V and features a maximum dropout voltage of 0.25V at full load. It utilizes a 4-terminal WLCSP package and supports output capacitance values between 1µF and 4.7µF.

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

• Delivers high power supply rejection ratio (PSRR) and low output noise for sensitive analog circuits.
• Incorporates comprehensive protection mechanisms including overcurrent, thermal shutdown, reverse polarity, and soft-start capabilities.
• Maintains stable regulation with small ceramic output capacitors ranging from 1µF to 4.7µF.

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

• Portable battery-powered electronic devices
• RF and wireless communication modules
• Embedded microcontroller power supplies

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 in the secondary market. Confirm that the received units match the specific suffix designations for package type and output voltage. Ensure storage conditions comply with moisture sensitivity level requirements to prevent soldering defects during surface mount assembly processes.

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

Select this regulator when a fixed 2.85V rail is required with moderate current demands up to 250mA. Consider the WLCSP-4 footprint constraints and verify that the application's input voltage remains above the minimum threshold while staying below the 5.5V maximum limit. Evaluate the thermal performance based on the expected ambient temperature and load current to ensure operation within the specified -40°C to +85°C range.

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

This component belongs to the ISL9021 series of high-performance LDOs designed for low-input-voltage applications. The series emphasizes low quiescent current and high PSRR, making it suitable for noise-sensitive environments. The ISL9021AIIKZ-T variant specifically denotes the 2.85V fixed output version packaged in a compact wafer-level configuration optimized for space-constrained PCB layouts.

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

Cross-reference with other ISL9021 variants such as ISL9021AIRUKZ-T or ISL9021IIGZ-T if different output voltages or packages are acceptable. Verify pin compatibility and electrical specifications before substituting to ensure circuit stability and performance integrity remain unchanged.