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Texas Instruments BQ76905RGRR
- Part No.:
- BQ76905RGRR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
BQ76905RGRR.pdf
- Description:
- LOW-POWER MONITOR AND PROTECTOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,312
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Product details
Overview
BQ76905RGRR from Texas Instruments is a high-accuracy battery monitor and protector IC for 2- to 5-series Li-ion, Li-polymer, LiFePO4, and LTO battery packs. It integrates a 16-bit delta-sigma cell voltage ADC (±4 mV typical error), a dual-resolution coulomb counter ADC (16-/24-bit), low-side NFET charge/discharge drivers, I²C host interface (400 kHz), and programmable 3.3 V REGOUT LDO. It serves as the core protection and telemetry controller in cordless power tools and industrial battery packs.
For engineers reviewing the BQ76905RGRR datasheet, BQ76905RGRR pinout, BQ76905RGRR application, or BQ76905RGRR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready procurement guidance - all grounded in TI's SLUSE97 production datasheet.
Technical Context
The BQ76905RGRR implements a dedicated analog front-end with two independent delta-sigma converters: one for simultaneous cell voltage measurement across up to five cells (VC0–VC5), and another for high-precision current sensing via SRP/SRN with ±200-mV input range and 48-bit charge integration. Its protection subsystem uses comparator-based hardware triggers for overvoltage, undervoltage, overtemperature, and overcurrent events - all configurable via registers or OTP memory.
Power management includes four distinct operational modes: NORMAL (32–175 µA), SLEEP (6 µA), DEEPSLEEP (2.7 µA), and SHUTDOWN (<1 µA), with autonomous wake-up capability from TS and VC0 pins. The integrated LDO (REGOUT) supports external system biasing at 1.8 V, 2.5 V, 3.0 V, 3.3 V, or 5.0 V, powered from REGSRC tied to BAT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 2-series to 5-series Li-ion/LiPo/LFP/LTO stacks - enables direct monitoring of compact multi-cell packs without external multiplexers. |
| Cell Voltage Accuracy | ±4 mV (typical) - ensures precise state-of-charge estimation and tight voltage-based protection thresholds. |
| Coulomb Counter Resolution | 16-bit + 24-bit delta-sigma ADC - provides high dynamic range for both precision charge tracking and fast transient current detection. |
| Current Sense Range | ±200 mV across sense resistor - supports wide-range shunt-based current measurement from milliamp to >100 A systems. |
| Supply Current (NORMAL) | 32–175 µA - balances active monitoring fidelity with ultra-low quiescent consumption in portable applications. |
| I²C Interface Speed | Up to 400 kHz with optional CRC - enables robust, high-throughput host communication for real-time telemetry and configuration updates. |
| REGOUT LDO Output | Programmable 1.8 V / 2.5 V / 3.0 V / 3.3 V / 5.0 V - powers external microcontrollers or sensors without requiring discrete regulators. |
| Protection Drivers | Integrated low-side NMOS CHG/DSG outputs - directly controls external FETs without gate driver ICs, reducing BOM count and layout complexity. |
Pinout & Package
20-pin QFN (RGR) package, 3.5 mm × 3.5 mm × 0.9 mm, 0.5-mm pitch - optimized for space-constrained battery pack PCBs with thermal pad for efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC0–VC5 | Cell voltage sense inputs | Direct connection points for stacked battery cell terminals; support simultaneous 5-cell monitoring and bidirectional balancing current paths. |
| SRP / SRN | Coulomb counter differential inputs | Interface to shunt resistor top/bottom; enable high-accuracy current integration with ±200-mV full-scale range and <1.5 µV offset. |
| CHG / DSG | Low-side FET drive outputs | Open-drain NMOS drivers controlling external charge/discharge MOSFETs; support autonomous recovery and fault latching. |
| SCL / SDA | I²C serial interface | 400-kHz bidirectional bus for host MCU communication; include internal pull-up capability and optional CRC validation. |
| REGOUT / REGSRC | Programmable LDO output/input | REGOUT supplies external circuitry at user-selected voltage; REGSRC draws from BAT to power LDO and FET drivers. |
| ALERT / INT | Interrupt output | Active-low open-drain signal indicating protection event, conversion completion, or communication error - reduces polling overhead. |
| TS | Thermistor/ADC input | Analog input for external NTC thermistor or internal temperature sensor; supports wake-from-SHUTDOWN on thermal threshold breach. |
| BAT / VSS | Main power / ground | BAT accepts 3–27.5 V pack voltage; VSS is the device reference ground - shared with shunt and cell sense returns for accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 5-cell voltage measurement | Enables true per-cell SoC/SoH tracking and independent overvoltage/undervoltage protection without time-multiplexed sampling delay. |
| Dual-mode coulomb counter (16-/24-bit) | Supports both high-precision long-term charge accumulation and faster transient current capture for accurate capacity gauging and load profiling. |
| Autonomous protection recovery | Allows automatic re-enable of CHG/DSG FETs after fault clearance - eliminates need for host MCU intervention in routine overtemp or overcurrent events. |
| Four-tier power management | Reduces average current draw to ≤2.7 µA in DEEPSLEEP while retaining wake-on-current or wake-on-temperature capability - extends shelf life and standby runtime. |
| One-time-programmable (OTP) configuration | Permits factory programming of critical settings (e.g., protection thresholds, LDO voltage) - ensures consistent behavior across production units without runtime register writes. |
| High-voltage tolerant cell inputs (45 V) | Supports safe operation in 5S Li-ion packs (≤21 V nominal) with margin for transients and LFP/LTO variants - eliminates need for external clamping diodes. |
Applications
| Cordless Power Tools | Vacuum Cleaners |
|---|---|
|
Use Scenario: 2S–5S Li-ion battery pack powering brushless motor and digital control board in handheld drills, saws, and impact drivers. IC Role / Device Role / Timing Role: Primary battery monitor and protector - performs real-time cell voltage/current/temperature acquisition, executes hardware-triggered overcurrent shutdown, and reports telemetry via I²C to host MCU. Use Value: Enables precise depth-of-discharge control and cycle-life extension through ±4 mV voltage accuracy and autonomous FET recovery - critical for maintaining tool performance across 500+ charge cycles. |
Use Scenario: 3S–5S LiFePO4 or Li-ion pack supplying high-pulse current to vacuum motor and onboard logic during intermittent suction duty cycles. IC Role / Device Role / Timing Role: Central protection controller - monitors stack voltage imbalance, detects short-circuit events within 100 µs using comparator-based hardware protection, and manages cell balancing during idle periods. Use Value: Prevents thermal runaway during motor stall conditions via hardware-level overcurrent detection and supports extended runtime with 2.7 µA DEEPSLEEP mode between cleaning sessions. |
| Non-Military Drones | Industrial Battery Packs |
|
Use Scenario: 3S–4S LiPo battery powering flight controller, ESCs, and telemetry radios in consumer-grade UAVs with strict weight and runtime constraints. IC Role / Device Role / Timing Role: Integrated telemetry hub - acquires synchronized cell voltages and current data at 2.93 ms intervals (slow mode), feeds SoC algorithm, and asserts ALERT on overtemperature during rapid ascent. Use Value: Delivers 15.5-bit effective resolution in current measurement mode - essential for accurate energy budgeting and remaining-flight-time prediction under variable load profiles. |
Use Scenario: Custom 2S–5S battery module for warehouse robotics, medical carts, or portable test equipment requiring UL/IEC-compliant safety certification. IC Role / Device Role / Timing Role: Safety-certifiable monitoring IC - implements redundant voltage/temperature diagnostics, stores calibration data in OTP memory, and supports traceable firmware updates via I²C. Use Value: Meets functional safety requirements through internal diagnostic checks (e.g., ADC reference validation, open-wire detection) and provides documented failure modes for ISO 13849 or IEC 61508 compliance evidence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor and protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76906RGRR | Supports 6-series cell stacks; identical pinout, same 20-pin QFN RGR package, and matching feature set except extended cell count. | Required for 6S Li-ion or higher-voltage LFP configurations where BQ76905RGRR's 5S limit is insufficient. | Select BQ76906RGRR only when monitoring ≥6 series cells; otherwise, BQ76905RGRR offers optimal cost/performance for 2S–5S designs. |
| BQ76907RGRR | Supports 7-series cell stacks; shares same RGR package, I²C interface, and protection architecture - differs solely in maximum supported cell count. | Applicable to 7S+ battery architectures such as high-power e-bikes or energy storage modules exceeding 25 V nominal. | Choose BQ76907RGRR for future-proofing or 7S+ systems; BQ76905RGRR remains preferred for cost-sensitive 2S–5S industrial tools and appliances. |
Compared with BQ76906RGRR and BQ76907RGRR, the BQ76905RGRR provides identical accuracy, power modes, and interface functionality but is specifically optimized for 2–5 series stacks - delivering lower system cost and reduced layout complexity where extended cell count is unnecessary.
Availability
BQ76905RGRR is available at Aetrix Electronics and suitable for cordless power tools, vacuum cleaners, non-military drones, and industrial battery packs requiring stable component supply, long-lifecycle support, and TI-qualified automotive-grade reliability.
Supply support for BQ76905RGRR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies - with decades of expertise in battery management systems for industrial and portable applications.
The BQ76905RGRR belongs to TI's BQ769xx family of highly integrated battery monitors and protectors, designed specifically for cost-effective, high-accuracy protection of 2–7 series lithium-based battery packs in demanding consumer and industrial environments.
FAQ
What is the maximum number of series-connected cells supported by the BQ76905RGRR?
The BQ76905RGRR supports battery packs with 2 to 5 series-connected cells, as confirmed in TI's SLUSE97 datasheet Section 1 (Features) and Section 4 (Device Comparison Table). This includes Li-ion, Li-polymer, LiFePO4, and LTO chemistries. For 6-series or 7-series stacks, TI specifies the BQ76906RGRR or BQ76907RGRR respectively - the BQ76905RGRR is not rated beyond 5S operation.
Does the BQ76905RGRR include built-in FET drivers, and what type are they?
Yes, the BQ76905RGRR integrates low-side NMOS charge (CHG) and discharge (DSG) FET drivers, as stated in Section 1 (Features) and Section 5 (Pin Functions) of the SLUSE97 datasheet. These are open-drain outputs capable of directly driving external N-channel MOSFETs, supporting autonomous recovery and latch-off modes - eliminating the need for external gate drivers in most 2S–5S applications.
What is the accuracy of cell voltage measurement for the BQ76905RGRR?
The BQ76905RGRR achieves ±4 mV typical cell voltage measurement accuracy using its 16-bit delta-sigma ADC, per Section 1 (Features) and Section 6.12 (Analog-to-Digital Converter) of the SLUSE97 datasheet. This specification applies across the full operating temperature range (–40°C to +110°C) and supports reliable overvoltage/undervoltage protection and precise state-of-charge calculation in the BQ76905RGRR.
Can the BQ76905RGRR perform host-controlled cell balancing, and how is it implemented?
Yes, the BQ76905RGRR supports host-controlled cell balancing via its VC0–VC5 pins, which serve dual roles as cell voltage sense inputs and balance current paths. As described in Section 1 (Features) and Section 7.7 (Cell Balancing), balancing is initiated and managed through I²C commands - enabling selective, timed balancing under MCU supervision rather than autonomous operation.
What power supply options does the BQ76905RGRR support for its REGOUT LDO?
The BQ76905RGRR's REGOUT LDO is programmable to 1.8 V, 2.5 V, 3.0 V, 3.3 V, or 5.0 V, as specified in Section 1 (Features) and Section 6.7 (REGOUT LDO) of the SLUSE97 datasheet. The output voltage is configured via OTP memory or runtime register writes, and the LDO draws power from the REGSRC pin - which must be supplied from the main battery (BAT) rail.
BQ76905RGRR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 2 ~ 5
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x3.5)
BQ76905RGRR FAQ
1.How can I place an order for BQ76905RGRR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ76905RGRR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ76905RGRR reliable?
The price and inventory of BQ76905RGRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ76905RGRR is usually 5 days.
3.What payment methods are accepted for BQ76905RGRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ76905RGRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ76905RGRR?
BQ76905RGRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ76905RGRR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ76905RGRR?
For technical support, including BQ76905RGRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ76905RGRR requirements.
6.How does Aetrix verify that BQ76905RGRR is sourced from the original manufacturer or authorized distributors?
All BQ76905RGRR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ76905RGRR meets industry standards.
7.What is the process for return or replacement of BQ76905RGRR?
All BQ76905RGRR units undergo pre-shipment inspection (PSI). If there is an issue with BQ76905RGRR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ76905RGRR part is unused and in its original packaging.
Return procedure for BQ76905RGRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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