Texas Instruments BQ27541DRZR-G1 Single-Cell Li‑ion Fuel Gauge with Impedance Track
The Texas Instruments BQ27541DRZR-G1 is a single-cell Li‑ion/Li‑Polymer battery fuel gauge designed to deliver reliable, high-fidelity information about state of charge (SOC), remaining capacity, and overall battery health. Built on TI’s proven Impedance Track algorithm and communicating over an I2C-compatible interface, this compact 12‑pin VSON (DRZ) device targets space-constrained portable designs where battery insight is critical to user experience and system longevity.
For engineers, buyers, and sourcing managers, the BQ27541DRZR-G1 offers a practical mix of performance, footprint, and ecosystem support. It provides the foundational metrics a system controller needs to make smart power decisions, while its small 12‑VSON package eases integration in dense handhelds and wearables. With TI’s documentation and tool support behind it, this fuel gauge reduces risk and accelerates time to production.
Why choose the BQ27541DRZR-G1?
- Accurate fuel gauging with Impedance Track: The algorithm is designed to estimate SOC and capacity while accounting for real-world battery behavior. This helps extend runtime predictions and improve user confidence in remaining-battery indications.
- Essential metrics for smart power management: Reports SOC, remaining capacity, and health indicators that system firmware can use to optimize performance, apply power-saving modes, and inform charge/discharge policies.
- I2C-compatible interface: Straightforward connection to a wide range of MCU platforms with minimal pin count overhead.
- Compact, production-friendly package: 12‑pin VSON (DRZ) footprint and Tape & Reel packaging support high-volume automated assembly.
- Designed for portable products: Ideal for smartphones, tablets, wearables, handheld instruments, and battery-powered IoT nodes.
Key Specifications
- Manufacturer/Brand: Texas Instruments
- MPN: BQ27541DRZR-G1
- Category: Battery Fuel Gauge IC
- Function: Battery fuel gauge
- Battery Chemistry: Single-cell Li‑ion / Li‑Polymer
- Algorithm: Impedance Track
- Interface: I2C-compatible
- Package Code: DRZ (12‑VSON)
- Package/Case: 12‑VSON (DRZ)
- Pin Count: 12
- Mounting Type: Surface Mount
- Packaging: Tape & Reel (TR)
Notes:
- Lifecycle status: Not specified in the provided data; refer to the TI product page for current status.
- RoHS/environmental compliance: Not specified in the provided data; consult TI documentation.
Applications and Use Cases
- Portable electronics needing accurate runtime estimates
- Smartphones and tablets that demand precise SOC reporting for user experience
- Wearables and handheld devices with tight board area and strict power budgets
- Battery-powered IoT nodes that rely on fuel-gauge data for energy-aware operation
In these scenarios, the Texas Instruments BQ27541DRZR-G1 helps the host make reliable decisions such as when to throttle performance, notify users, or initiate safe shutdown. Consistent SOC and capacity information also aids fleet management in enterprise devices, reducing unexpected downtime and support calls.
System Integration Notes
The BQ27541DRZR-G1 is intended for single-cell Li‑ion/Li‑Polymer packs and communicates over an I2C-compatible interface. In a typical system, the host MCU periodically reads SOC, remaining capacity, and health status over I2C, then applies this information to power policies and user notifications.
High-level integration tips (non-exhaustive):
- Single-cell topology: Ensure your battery configuration aligns with the device’s single-cell requirement.
- I2C planning: Allocate the I2C address and bus bandwidth in your system map and include appropriate pull-ups per your design standards. Specific electrical values are not provided here; follow the TI datasheet.
- Algorithm use: TI’s Impedance Track technology is designed to improve SOC and capacity estimates. Review the datasheet and application resources for recommended initialization and usage flows.
- Layout and footprint: Leverage TI’s package drawings for the DRZ (12‑VSON) package to meet pad, solder mask, and stencil guidelines. Dimensions and land patterns should be taken directly from the datasheet.
- Firmware: Architect your firmware to periodically sample fuel-gauge data and log metrics for ongoing validation. Register details and timing guidance should follow TI documentation.
Because electrical characteristics and timing parameters are not specified here, always consult the official TI datasheet for design-critical details such as supply, timing, register configuration, and recommended operating conditions.
Package, Ordering, and Handling
- Package: 12‑VSON (DRZ), 12 pins, Surface Mount
- Standard Packaging: Tape & Reel (TR)
- Orderable Suffix: DRZR indicates tape-and-reel packaging (full reel)
- Variant Note: For small-quantity tape-and-reel, TI may offer DRZT variants (availability can vary by region and time)
The compact DRZ VSON package supports high-density layouts common in wearables and handhelds. Work closely with your EMS partner to confirm reel sizes, pickup orientation, and moisture sensitivity handling in accordance with TI’s component-level documentation.
Lifecycle, Availability, and Replacements
- Lifecycle Status: Not specified in the provided data. Always verify current lifecycle state on the TI product page.
- Availability: Not specified by TI here; our listing indicates inventory quantity 0 at this time. Lead times and stock can change—check with authorized distributors or TI’s website for the latest.
- Replacements/Next-Gen Options: No direct replacements are specified in the provided data. If you are qualifying a platform, consider engaging TI technical resources to review current-generation gauges that align with your needs.
Procurement guidance:
- Maintain second-source strategies where feasible, even if functionally equivalent alternates are not listed in this data set.
- Lock the MPN “BQ27541DRZR-G1” in the AVL to avoid unintended package or algorithm variations.
- For NPI builds, confirm orderable suffixes and packaging details (DRZR vs DRZT) to ensure the correct reel quantity and labeling.
Compliance and Environmental
- RoHS/REACH: Not specified in the provided data. Check TI’s product page and compliance documentation for the latest declarations.
- Additional Compliance Docs: None provided here.
If your program requires specific environmental certifications or material disclosures, source the official TI compliance PDFs via the product page links below.
Documentation and Resources
- TI Product Page: https://www.ti.com/product/BQ27541-G1
- Datasheet: https://www.ti.com/lit/ds/symlink/bq27541-g1.pdf
These are the authoritative sources for electrical specifications, register maps, design examples, package drawings, and compliance information. Always base final design decisions on the latest official documentation.
Bill of Materials and Layout Considerations
While detailed electrical parameters are not listed here, most designs will require standard I2C pull-up resistors and adherence to TI’s layout recommendations for the DRZ package. Place the BQ27541DRZR-G1 to minimize noise coupling on sensitive measurement nodes, and maintain clean return paths around the gauge and sense connections as guided by TI’s documents. Keep the I2C traces short and well-routed to ensure reliable communication in compact systems like wearables.
When integrating into an existing platform, consider:
- Firmware update pathways for tuning and calibration procedures recommended by TI.
- Board test points for validation of SOC and capacity behavior during bring-up.
- Production programming or configuration flows, if required by your manufacturing process (consult the datasheet and TI resources for specifics).
Applications Spotlight
- Portable electronics: From wireless peripherals to handheld meters, accurate SOC helps avoid unexpected brownouts and extends user trust.
- Smartphones and tablets: Fine-grained capacity reporting supports better battery indicators and power-saving heuristics.
- Wearables and handheld devices: Space constraints and low power budgets favor the 12‑VSON (DRZ) package and I2C interface.
- Battery-powered IoT nodes: Predictable runtime estimates allow devices to opportunistically schedule transmissions and maintenance windows.
In each case, the Texas Instruments BQ27541DRZR-G1 delivers a focused solution: a compact, I2C-compatible fuel gauge using Impedance Track to inform smarter system behavior.
Frequently Asked Questions (FAQs)
Q: What battery types does the BQ27541DRZR-G1 support?
A: Single-cell Lithium-ion and Lithium-Polymer chemistries.
Q: What interface does it use to communicate with the host?
A: An I2C-compatible interface.
Q: What package is the Texas Instruments BQ27541DRZR-G1 supplied in?
A: A 12‑pin VSON package with the DRZ code (12‑VSON, DRZ).
Q: What information can the fuel gauge report?
A: State of charge (SOC), remaining capacity, and battery health information, as stated in the product description.
Q: Is the BQ27541DRZR-G1 intended for multi-cell batteries?
A: No, it is intended for single-cell Li‑ion/Li‑Polymer applications.
Q: What do the orderable suffixes mean?
A: The DRZR suffix indicates tape-and-reel packaging (full reel). TI may also offer DRZT variants for small-quantity tape-and-reel, subject to availability.
Q: Is RoHS or other environmental compliance information available?
A: Not specified in the provided data. Check the TI product page and datasheet for current compliance declarations.
Q: Where can I find the full electrical specifications and register details?
A: Refer to the Texas Instruments datasheet: https://www.ti.com/lit/ds/symlink/bq27541-g1.pdf
Summary
The Texas Instruments BQ27541DRZR-G1 is a compact, I2C-compatible single-cell Li‑ion/Li‑Polymer fuel gauge that leverages TI’s Impedance Track technology to deliver the SOC, capacity, and health insights modern portable designs require. Its 12‑VSON (DRZ) package, Tape & Reel availability, and proven TI ecosystem make it a compelling choice for smartphones, wearables, portable instruments, and battery-powered IoT devices. While lifecycle status and environmental details are not specified here, TI’s product page and datasheet provide the authoritative resources you’ll need to take this device from evaluation through production. By standardizing on the BQ27541DRZR-G1, teams can streamline sourcing, tighten board layouts, and improve battery-related user experiences across their product lines.