BQ27421YZFR-G1B

Battery Management Overview

The BQ27421YZFR-G1B is a system-side Impedance Track fuel gauge from Texas Instruments, designed for single-cell lithium-ion and lithium polymer batteries. It integrates a high-precision analog-to-digital converter and an internal sense resistor to monitor battery parameters. The device operates within a supply voltage range of 2.45 V to 4.5 V and supports battery capacities between 100 mAh and 8000 mAh. Key electrical specifications include a working supply current of 93 uA, an output current of 500 uA, and an output voltage range of 4.3 V to 4.35 V. It functions reliably across temperatures from -40 C to +85 C.

Battery Management Feature Summary

• Integrates Impedance Track algorithm with internal sense resistor for accurate state-of-charge monitoring
• Supports configurable battery chemistries including lithium-ion and lithium polymer types
• Provides digital communication interface for system-side integration

Battery Management Applications

• Portable medical devices requiring precise battery life estimation
• Handheld industrial tools utilizing single-cell lithium batteries
• Consumer electronics such as tablets and smartphones

Battery Management Procurement Notes

Verify the specific suffix G1B against the manufacturer datasheet to confirm pinout and configuration settings. Ensure the DSBGA-9 package compatibility matches your PCB layout requirements. Cross-reference the internal sense resistor value if external calibration is not utilized. Confirm RoHS compliance status through official documentation before finalizing procurement orders.

Battery Management Selection Notes

Select this component when system-side placement is preferred over pack-side integration. It is suitable for applications requiring built-in sensing without external shunt resistors. Consider the 93 uA operating current for low-power standby requirements. Verify that the supported capacity range of 100 mAh to 8000 mAh aligns with the target battery cell specifications.

Battery Management Part Context

This part belongs to the BQ27421-G1 series of Impedance Track fuel gauges. It is manufactured by Texas Instruments under the PMIC category. The YZFR suffix indicates the DSBGA-9 surface mount package and reel packaging format. It serves as a specialized solution for single-cell battery management in compact electronic designs.

Battery Management Replacement Considerations

Check for BQ27421YZFT-G1B or BQ27421YZFR-G1A as potential variants within the same family. Verify package and suffix differences before substitution.