ISL9221IRZ-T

Battery Chargers Overview

The ISL9221IRZ-T is a single-cell lithium-ion/polymer battery charger IC manufactured by Renesas Electronics Corporation. It supports dual inputs, accommodating USB connections or power adapters with input voltages up to 6.7V and withstands up to 28V. The device provides a maximum programmable charging current of 1.2A and targets a precise 4.2V output voltage with 1% accuracy. It operates within a temperature range of -40°C to +85°C and utilizes a 12-DFN (4x3) surface-mount package.

Battery Chargers Feature Summary

• Dual input architecture supporting both USB host and wall adapter sources
• Integrated overvoltage protection on USB inputs to safeguard system components
• Thermal regulation with automatic current foldback at elevated temperatures
• Programmable charge termination and current settings via external resistors

Battery Chargers Applications

• Handheld electronic devices requiring single-cell lithium battery management
• USB-powered portable electronics systems
• Devices utilizing external DC power adapters for charging operations

Battery Chargers Procurement Notes

Verify component status as the ISL9221 series is designated as not recommended for new designs and may be discontinued. Confirm availability of the tape-and-reel variant (ISL9221IRZ-T) against the tube-packaged standard version. Ensure compatibility with existing design specifications before procurement due to potential supply constraints.

Battery Chargers Selection Notes

Select this component for applications requiring flexible dual-input charging capabilities from USB or adapter sources. Consider the 1.2A maximum current limit and 4.2V precision target for single-cell lithium chemistry requirements. Evaluate the 12-DFN package dimensions for PCB layout constraints and verify thermal management needs given the integrated foldback protection features.

Battery Chargers Part Context

The ISL9221 belongs to the Intersil/Renesas family of lithium-ion battery chargers designed for handheld devices. It integrates power path management and system load sharing features. The IRZ suffix indicates a specific lead-free tape-and-reel packaging configuration within the broader ISL9221 product line.

Battery Chargers Replacement Considerations

Public documentation explicitly states no recommended replacement exists for this discontinued part number. Contact technical support for potential alternatives.