ISL8500IRZ-T

Voltage Regulators - DC DC Switching Regulators Overview

The ISL8500IRZ-T is an obsolete standard buck PWM regulator from Renesas Electronics. It integrates a 2A switching power MOSFET and requires an external Schottky diode. The device supports a fixed 5V input or a variable range of 5.5V to 25V. It utilizes voltage mode control with feed-forward at a fixed 500kHz frequency. The output voltage is adjustable from 0.6V to 19V, delivering up to 2A continuous current. It features overcurrent, undervoltage, and thermal protection within a compact 4mm x 3mm DFN package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 2A standard buck PWM controller with an internal switching N-Channel power MOSFET
• Utilizes voltage mode control with input voltage feed-forward for flexible component selection
• Includes integrated protection mechanisms for overcurrent, undervoltage, and thermal overload

Voltage Regulators - DC DC Switching Regulators Applications

• WLAN Cards (PCMCIA, Cardbus32, MiniPCI)
• Compact Flash Cards
• Hand-Held Instruments
• LCD Panel Set-top Box

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the obsolete status of the ISL8500IRZ-T before procurement planning. As this component is no longer in production, confirm availability through secondary market channels or authorized distributors holding remaining stock. Ensure that the specific suffix 'T' corresponds to the required reel packaging format if applicable. Cross-reference the pinout and electrical specifications against the official datasheet to ensure compatibility with existing designs.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select the ISL8500IRZ-T only for legacy systems requiring its specific 2A current capability and voltage mode control architecture. This part is suitable for applications needing a simple solution with an external Schottky diode. Consider the ISL85003 as a modern alternative if synchronous rectification and higher efficiency are required. Evaluate the fixed 500kHz switching frequency against EMI constraints and inductor size requirements for the target application.

Voltage Regulators - DC DC Switching Regulators Part Context

The ISL8500 series represents Renesas's earlier generation of integrated buck regulators designed for cost-sensitive point-of-load applications. Unlike newer synchronous models, this family relies on an external diode, influencing the overall bill of materials and board space. The ISL8500IRZ-T specifically denotes the tape-and-reel packaging variant of the IRZ package, intended for automated surface-mount assembly processes.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The ISL85003 is listed as a direct replacement product for the ISL8500 series. Note that the ISL85003 is a synchronous buck regulator, differing from the asynchronous nature of the ISL8500. Designers must account for changes in control topology, external component requirements, and potential differences in thermal performance when migrating.