BQ27421YZFR-G1A

Battery Management Overview

The BQ27421YZFR-G1A is a system-side Impedance Track fuel gauge with an integrated sense resistor, designed for single-cell lithium-ion and lithium-polymer batteries. It operates within a supply voltage range of 2.45 V to 4.5 V and supports battery capacities from 100 mAh to 8000 mAh. The device provides an output voltage of 4.2 V and draws a typical operating current of 93 uA. It utilizes an I2C interface for communication and functions reliably across temperatures from -40°C to +85°C in a compact 9-DSBGA package.

Battery Management Feature Summary

• Integrates the sense resistor to minimize external component count
• Utilizes Impedance Track technology for accurate state-of-charge estimation
• Supports standard I2C communication protocol

Battery Management Applications

• Portable consumer electronics
• Medical devices
• Industrial handheld instruments

Battery Management Procurement Notes

Verify the specific suffix G1A against the manufacturer datasheet to confirm the exact output voltage configuration and revision level. Ensure the DSBGA-9 footprint matches the PCB design. Confirm RoHS compliance status through official documentation before finalizing procurement orders.

Battery Management Selection Notes

Select this component when a system-side fuel gauge with an internal sense resistor is required for single-cell Li-Ion or Li-Po applications. It is suitable for designs prioritizing low power consumption and high accuracy without external shunt resistors. Verify that the target battery capacity falls within the supported 100 mAh to 8000 mAh range.

Battery Management Part Context

This part belongs to the BQ27421-G1 series of Impedance Track fuel gauges. It is distinct from pack-side variants like the BQ27741 and other system-side models such as the BQ27425. The YZFR suffix indicates the tape-and-reel packaging format for surface-mount assembly.

Battery Management Replacement Considerations

Publicly confirmed direct substitutes are not available in the provided data. Consider the BQ27421YZFT-G1A for cut-tape packaging or the BQ27421-G1 family members if pin compatibility and functional requirements align.