BQ40Z50RSMR-R2

Texas Instruments BQ40Z50RSMR-R2 battery pack manager for 2–4S Li‑ion/Li‑poly systems

Engineers building smart, multi‑cell lithium battery packs can rely on the Texas Instruments BQ40Z50RSMR-R2 to combine accurate fuel gauging, integrated protection, and cell balancing in a compact 32‑pin VQFN. Part of TI’s BQ40Z50 family, this -R2 ROM variant supports Turbo Mode 2.0 and communicates over an SMBus (I2C‑compatible) interface, making it a strong fit for portable, professional, and industrial designs that demand dependable runtime estimates and robust pack safety from −40°C to +85°C.

The BQ40Z50RSMR-R2 is categorized under Battery Management ICs > Battery Fuel Gauges / Pack Managers and is designed specifically for 2–4 series cell Li‑ion/Li‑poly configurations. With TI’s Impedance Track fuel gauging and integrated protection features, it helps reduce external components and streamlines certification paths for smart battery packs.

At‑a‑glance highlights

• Brand/Manufacturer: Texas Instruments
• MPN: BQ40Z50RSMR-R2 (BQ40Z50, ROM version R2)
• Cell configuration: 2–4 series Li‑ion/Li‑poly cells
• Fuel gauge algorithm: Impedance Track
• Interface: SMBus (I2C‑compatible)
• Protection: Over/under‑voltage, overcurrent, short‑circuit, overtemperature
• Cell balancing: Integrated
• Turbo Mode 2.0: Supported
• Operating temperature: −40°C to +85°C
• Package: 32‑pin VQFN (TI package code RSM)
• Mounting: Surface mount
• Packaging: Tape & Reel (TR)

Overview

The Texas Instruments BQ40Z50RSMR-R2 is a highly integrated battery pack manager intended for smart, multi‑cell lithium packs in demanding portable applications. By pairing Impedance Track fuel gauging with integrated balancing and core pack protection, this device helps deliver more predictable performance over a battery’s life while simplifying system design. Communication via SMBus (I2C‑compatible) makes it straightforward to integrate with a host controller for status reporting and control.

Use the BQ40Z50RSMR-R2 when you need a compact 32‑pin VQFN solution for 2S to 4S packs, and when consistent gauging and built‑in protection are critical to product quality and user experience. The device is qualified for industrial temperature ranges and supports Turbo Mode 2.0 features within the BQ40Z50 family.

Key features and benefits

• Impedance Track fuel gauging
• TI’s proven approach to tracking battery behavior over time.
• Helps maintain accurate runtime/state‑of‑charge estimates across operating conditions.
• Integrated pack protection
• Over/under‑voltage, overcurrent, short‑circuit, and overtemperature protections reduce the need for discrete protection elements.
• Built‑in cell balancing
• Integrated balancing support for 2–4 series cells simplifies the board design and helps maximize pack capacity.
• SMBus (I2C‑compatible) interface
• Enables host communication for monitoring, control, and system power management.
• Wide operating temperature
• −40°C to +85°C supports industrial and rugged portable equipment.
• Compact VQFN package
• 32‑pin VQFN (RSM) aids thermal performance and saves board space in dense designs.
• Turbo Mode 2.0 support
• Designed to support Turbo Mode 2.0 features within the BQ40Z50 family.

Specifications

The following specifications are derived from the provided part information. Where data is not present in the provided sources, it is noted accordingly.

• Device family/series: BQ40Z50 (ROM revision R2)
• Cell configuration: 2–4 series Li‑ion/Li‑poly
• Fuel gauge algorithm: Impedance Track
• Interface: SMBus (I2C‑compatible)
• Protection features: Over/under‑voltage, overcurrent, short‑circuit, overtemperature
• Cell balancing: Integrated
• Operating temperature range: −40°C to +85°C
• Package: 32‑pin VQFN (RSM)
• Mounting type: Surface mount
• Pin count: 32
• Power consumption: Not specified in datasheet
• Data rates/latency: Not specified in datasheet

Physical and packaging details:

• Package/case: 32‑VQFN (RSM)
• Packaging format: Tape & Reel (TR)

Compliance and lifecycle:

• Lifecycle status: Active
• RoHS status: RoHS Compliant (Lead‑free/Green)
• Other environmental/compliance details: Not specified in datasheet

Applications

The Texas Instruments BQ40Z50RSMR-R2 is well suited to a wide range of battery‑powered systems where reliable gauging, safety, and space efficiency are important:

• Notebook PCs and ultrabooks
• Portable industrial equipment
• Medical and test instruments
• Smart battery packs for 2–4S Li‑ion/Li‑poly systems

These applications benefit from the device’s integrated protection and balancing, reducing external circuitry. The SMBus‑based reporting enables the host to make informed power‑management decisions, improving user experience and extending usable runtime.

Design and implementation notes

While every design is different, the following considerations can help streamline integration of the BQ40Z50RSMR-R2 into 2S–4S packs:

• Cell configuration and balancing

• Confirm the intended 2S/3S/4S configuration early and select passive components accordingly.

• Leverage the device’s integrated balancing to maintain pack health across cells.

• System communication

• Plan the SMBus (I2C‑compatible) interface routing and address assignment to avoid conflicts with other devices on the bus.

• Implement host polling/interrupt strategies appropriate for your system’s power states.

• Protection strategy

• Map over/under‑voltage, overcurrent, short‑circuit, and overtemperature thresholds to pack‑level safety requirements.

• Ensure thermal sensing and layout support accurate temperature measurement for protection decisions.

• Power budget and thermals

• Account for gauge and balancing power in the overall pack energy budget.

• Optimize copper areas and thermal vias under the 32‑VQFN (RSM) package per layout guidance.

• Firmware/ROM versioning

• The -R2 suffix denotes the ROM revision associated with this BQ40Z50 device. Align host software and configuration tools with the -R2 feature set.

• Documentation

• Consult the product page and datasheet for configuration registers, recommended external components, timing, and calibration steps. Feature details beyond those listed here should be verified in the official documentation.

Note: Specific electrical characteristics, detailed timing, and configuration register maps are not included in the provided data and should be obtained from the Texas Instruments datasheet/technical reference materials.

Lifecycle, revisions, and replacements

• Current status: Active (per Texas Instruments)
• ROM designation: -R2 indicates the ROM version for this BQ40Z50 device
• Suggested replacement: BQ40Z50-R3
• Compatibility: Pin‑to‑pin with updated ROM version
• Guidance: Verify firmware and feature differences in the Technical Reference Manual before substitution.

This makes migration planning straightforward if your supply chain or project lifecycle favors the newer ROM. Always confirm any behavioral or configuration changes that may impact your host software or production tooling.

Compliance and environmental information

• RoHS: RoHS Compliant (Lead‑free/Green)
• Additional environmental or safety certifications: Not specified in datasheet

If your end product requires specific certifications or environmental declarations beyond RoHS, review TI’s product page and documentation for the most current compliance information.

Ordering, sourcing, and availability

When specifying or procuring the Texas Instruments BQ40Z50RSMR-R2, keep the following in mind:

• Full orderable part number: BQ40Z50RSMR-R2
• BQ40Z50: Device family
• RSM: 32‑pin VQFN package code
• R2: ROM version designation
• Packaging: Tape & Reel (TR)
• Mounting: Surface mount
• Availability: Check TI and authorized distributors for current availability
• Pricing: Varies by distributor and quantity

Sourcing tips:

• Plan for lifecycle alignment. If your design horizon is long, consider evaluating the BQ40Z50‑R3 as a drop‑in path while you validate any ROM differences.
• Keep ROM version control in your BOM and firmware notes to prevent mix‑ups between R2 and R3 in production.
• Use distributor parametric search filters (cell count, package, interface) to quickly cross‑check compatible alternatives if supply tightens.

Approved alternates: None listed in the provided data.

Note: This page does not provide guaranteed stock levels or real‑time pricing. Consult the TI product page and franchised distributors for up‑to‑date supply information.

Resources and documentation

• Product page: https://www.ti.com/product/BQ40Z50-R2
• Datasheet: https://www.ti.com/lit/gpn/bq40z50-r2

These links provide authoritative specifications, configuration details, and application guidance directly from Texas Instruments.

Frequently asked questions (FAQs)

Q: How many cells does the Texas Instruments BQ40Z50RSMR-R2 support?
A: It supports 2 to 4 series‑connected Li‑ion/Li‑polymer cells.

Q: What package is the BQ40Z50RSMR-R2 supplied in?
A: A 32‑pin VQFN package (TI package code RSM). It is typically shipped in Tape & Reel (TR) packaging.

Q: Does the BQ40Z50RSMR-R2 support Turbo Mode 2.0?
A: Yes. The part is specified as supporting Turbo Mode 2.0 features within the BQ40Z50 family.

Q: What communication interface does it use?
A: SMBus (I2C‑compatible), enabling host‑to‑battery communication.

Q: Are pack protection features integrated, or do I need extra ICs?
A: Core protection functions—over/under‑voltage, overcurrent, short‑circuit, and overtemperature—are integrated.

Q: Is cell balancing built in?
A: Yes. Integrated cell balancing supports 2–4S configurations.

Q: What operating temperature range is specified?
A: −40°C to +85°C.

Q: Is the device RoHS compliant?
A: Yes. It is listed as RoHS Compliant (Lead‑free/Green).

Q: What is the difference between BQ40Z50‑R2 and BQ40Z50‑R3?
A: The -R3 device is a later ROM version and is pin‑to‑pin compatible. Verify firmware and feature differences in the Technical Reference Manual before substituting.

Q: Where can I find the latest documentation for the Texas Instruments BQ40Z50RSMR-R2?
A: Refer to the TI product page and datasheet linked above for the most current information.

Summary

The Texas Instruments BQ40Z50RSMR-R2 brings together Impedance Track fuel gauging, integrated safety features, and cell balancing for 2–4S Li‑ion/Li‑poly packs in a compact 32‑pin VQFN. Its SMBus (I2C‑compatible) interface and support for Turbo Mode 2.0 make it a strong, flexible choice for portable and industrial designs that need dependable gauging from −40°C to +85°C. With an active lifecycle status and a straightforward migration path to BQ40Z50‑R3, it helps teams de‑risk long‑term sourcing while maintaining a consistent electrical footprint.

For detailed electrical characteristics, configuration procedures, and design examples, use the TI datasheet and product page as the single source of truth when finalizing your design with the BQ40Z50RSMR‑R2.