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Texas Instruments BQ28Z620DRZR
- Part No.:
- BQ28Z620DRZR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
BQ28Z620DRZR.pdf
- Description:
- BATTERY FUEL GAUGE WITH INTEGRAT
- Quantity:
- Payment:
- Shipping:
Inventory:1,187
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Product details
Overview
BQ28Z620DRZR from Texas Instruments is a flash-programmable, autonomous gas gauge and protection IC for 1- to 2-series Li-ion/Li-polymer battery packs. It integrates Impedance Track™ algorithm, dual independent ADCs (simultaneous current/voltage sampling), 1.2-V I²C interface, SHA-1 authentication, and high-side N-CH FET drivers (CHG/DSG) - enabling precise state-of-charge estimation and real-time safety control in portable audio devices.
For engineers reviewing the BQ28Z620DRZR datasheet, BQ28Z620DRZR pinout, BQ28Z620DRZR application, or BQ28Z620DRZR equivalent, key selection criteria include its 0.5-mΩ sense resistor support, <1 µV coulomb counter offset error, 400-kHz I²C with 1.2-V logic compatibility, integrated cell balancing, and programmable overvoltage/overcurrent/temperature protection thresholds.
Technical Context
The BQ28Z620DRZR implements a custom RISC CPU with flash memory for firmware-based protection logic and Impedance Track™ modeling, eliminating host MCU dependency for charge control via Master Mode I²C broadcasts. Its analog front-end includes two synchronized 16-bit ADCs - one dedicated to voltage sensing (VC1/VC2/PACK), the other to current measurement (SRP/SRN) - with configurable digital filtering and 14–15 effective bits resolution.
Protection architecture features four independent current fault detection paths (OCD, SCC, SCD1, SCD2), each with programmable voltage thresholds (down to 4.15 mV) and timing (as low as 0 µs delay), plus dual N-CH gate drivers supporting selectable 5.75-V or 9.4-V drive levels to optimize sleep-mode IQ and FET turn-on robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 1- to 2-series Li-ion/Li-polymer battery stacks - enables compact single- or dual-cell pack designs without external voltage scaling. |
| Coulomb Counter Offset Error | <1 µV typical input offset - ensures sub-1 mA current measurement accuracy with 0.5-mΩ sense resistors. |
| I²C Interface | 400-kHz operation with 1.2-V logic-level compatibility - supports high-speed data access and programming on low-voltage system buses. |
| Protection Threshold Resolution | 1.39 mV step size for discharge overcurrent (OCD) with RSNS=0 - allows fine-grained current limit tuning for ultra-low-Rsense configurations. |
| Sleep Current | 70 µA typical - maintains battery monitoring and wake-on-current functionality while minimizing standby drain. |
| Cell Balancing | Internal bypass FET with 200 Ω typical RDS(on) - enables passive balancing across both cells in 2-series configurations without external components. |
| Authentication | SHA-1 responder integrated in hardware - provides cryptographic challenge-response security against counterfeit battery packs. |
Pinout & Package
Package: 12-pin VSON (DRZ), 4 mm × 2.5 mm body size, exposed thermal pad electrically connected to VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Power ground | Primary reference for all analog and digital circuitry; connects to exposed thermal pad for thermal dissipation. |
| SRN / SRP | Coulomb counter analog inputs | Differential pair measuring voltage drop across external sense resistor - supports bidirectional current sensing with ±100 mV full-scale range. |
| TS1 | Analog temperature input | Connects to NTC thermistor or internal sensor; uses 18-kΩ internal pull-up for accurate thermal monitoring of battery cells. |
| SCL / SDA | I²C serial interface | Open-drain, 1.2-V logic-compatible bus pins requiring external pull-ups; enable host communication and firmware updates. |
| DSG / CHG | N-CH FET gate drivers | High-side drivers with programmable 5.75-V or 9.4-V output swing - maintain serial bus communication during fault conditions by keeping PACK line active. |
| PACK | Pack voltage sense / power path | Measures total pack voltage; serves as backup power source when VC2 is disconnected - ensures continuous operation during charger removal. |
| VC1 / VC2 | Cell voltage inputs | Direct connections to cell terminals for individual voltage monitoring and balancing control in 2-series configurations. |
| PBI | Backup power input | Accepts external capacitor (2.2 µF typical) to sustain operation during brief VC2 interruptions - critical for uninterrupted gauging during hot-swap events. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous Master Mode I²C | Eliminates host software overhead by broadcasting charging voltage/current commands directly to external chargers - enables true standalone battery management. |
| Simultaneous Dual-ADC Sampling | Enables time-aligned voltage and current acquisition for high-fidelity impedance modeling - essential for accurate SoC and SoH estimation under dynamic load. |
| Programmable Protection Timing | Configurable fault detection delays from 0 µs (SCC/SCD1) to 31 ms (OCD) - allows optimization between response speed and noise immunity in diverse application environments. |
| Low-Voltage I²C Compatibility | 1.2-V logic interface supports direct connection to modern low-power microcontrollers and PMICs without level-shifting - reduces BOM count and layout complexity. |
| Integrated Cell Balancing | On-chip bypass FETs per cell eliminate need for external balancing circuits - simplifies 2-series pack design and improves long-term capacity retention. |
Applications
| Tablet Computing | Portable Audio Devices |
|---|---|
Use Scenario: High-density battery packs in thin-profile tablets requiring precise runtime prediction and thermal-safe charging. IC Role / Device Role / Timing Role: Gas gauge and protection controller managing cell-level voltage, current, temperature, and FET switching. Use Value: Enables >99% SoC accuracy across 0–100% SOC and -20°C to 60°C, extending usable battery life by preventing overcharge/overdischarge. |
Use Scenario: Wireless Bluetooth speakers with sealed enclosures where thermal management and runtime visibility are critical. IC Role / Device Role / Timing Role: Autonomous battery manager performing real-time impedance tracking and fault response without host intervention. Use Value: Maintains stable audio playback during peak current draw by detecting and limiting short-circuit faults within 915 µs. |
| Wearable Health Devices | Medical Portable Monitors |
Use Scenario: Compact wearable ECG or glucose monitors powered by single-cell Li-ion batteries with strict safety certification requirements. IC Role / Device Role / Timing Role: Safety-critical protector enforcing UL/IEC-compliant overvoltage, overtemperature, and overcurrent limits. Use Value: SHA-1 authentication prevents unauthorized battery substitution - ensuring traceability and compliance in regulated healthcare deployments. |
Use Scenario: Battery-powered patient monitors requiring continuous operation, low standby drain, and reliable end-of-life warning. IC Role / Device Role / Timing Role: Precision fuel gauge providing calibrated SoH estimation and predictive low-battery alerts. Use Value: 10-year data flash retention and 20,000 write cycles enable field-upgradable protection algorithms and lifetime calibration storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery gas gauge and protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ28Z610DRZR | Lacks 1.2-V I²C logic level; no 5.75-V gate drive option; higher minimum protection threshold (8.3 mV vs. 4.15 mV). | Less suitable for ultra-low-Rsense (<1 mΩ) designs and systems with 1.2-V I/O domains. | Select BQ28Z620DRZR when interfacing with 1.2-V MCUs or using sub-1-mΩ sense resistors. |
| BQ28Z62EVM-012 | Evaluation module (not IC); includes BQ28Z620DRZR plus PCB, connectors, and GUI software - not a direct component replacement. | Used for prototyping and validation only; requires separate component sourcing for production. | Use BQ28Z62EVM-012 for development; BQ28Z620DRZR for volume manufacturing. |
Compared with BQ28Z610DRZR, the BQ28Z620DRZR delivers finer current-sensing resolution and lower-voltage I²C compatibility, while the BQ28Z62EVM-012 serves exclusively as a development tool - making BQ28Z620DRZR the sole production-ready IC choice for next-generation compact Li-ion packs.
Availability
BQ28Z620DRZR is available at Aetrix Electronics and suitable for tablet computing, portable audio devices, wearable health devices, and medical portable monitors requiring stable component supply, long-term lifecycle support, and certified battery safety compliance.
Supply support for BQ28Z620DRZR 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 over 50 years of innovation in battery management systems.
The BQ28Z620DRZR belongs to TI's Impedance Track™ gas gauge product line, designed specifically for autonomous, high-accuracy fuel gauging and safety-critical protection in space-constrained, single- and dual-cell Li-ion battery applications.
FAQ
What is the primary function of the BQ28Z620DRZR in a battery pack?
The BQ28Z620DRZR serves as an autonomous gas gauge and protection IC for 1- to 2-series Li-ion/Li-polymer battery packs. It performs real-time state-of-charge (SoC) and state-of-health (SoH) estimation using Impedance Track™ technology, while simultaneously enforcing programmable voltage, current, and temperature protections. The BQ28Z620DRZR integrates dual ADCs, SHA-1 authentication, and N-CH FET drivers - enabling complete pack-level intelligence without host MCU intervention.
Does the BQ28Z620DRZR support 1.2-V I²C logic levels?
Yes, the BQ28Z620DRZR explicitly supports 1.2-V logic-level I²C communication, as confirmed in Section 8.25 of its datasheet. This feature allows direct interface with low-voltage microcontrollers and PMICs without external level shifters. The BQ28Z620DRZR operates at 400-kHz I²C speed with this voltage level, ensuring high-speed data access and firmware updates in power-sensitive portable systems.
What is the minimum current sense resistor value supported by the BQ28Z620DRZR?
The BQ28Z620DRZR supports current sense resistors down to 0.5 mΩ, enabled by its ultra-low coulomb counter input offset error (<1 µV typical) and programmable protection thresholds as low as 4.15 mV (with RSNS=0). This capability allows accurate 1-mA current measurement and precise overcurrent detection in high-current, low-voltage battery applications - a key differentiator from earlier generation gauges like the BQ28Z610DRZR.
How does the BQ28Z620DRZR handle cell balancing in 2-series configurations?
The BQ28Z620DRZR provides integrated passive cell balancing via internal bypass FETs connected to VC1 and VC2 pins, with a typical RDS(on) of 200 Ω. In 2-series configurations, it independently controls balancing current for each cell using firmware-configurable timing and thresholds - eliminating external balancing components and reducing PCB area. Balancing is triggered based on voltage differential, temperature, or SoC divergence, improving long-term pack capacity retention.
What safety certifications or standards does the BQ28Z620DRZR help satisfy?
The BQ28Z620DRZR supports compliance with UL 1642, IEC 62133, and UN 38.3 through its comprehensive, programmable protection suite - including overvoltage, undervoltage, overcurrent (OCD/SCC/SCD), overtemperature, and short-circuit detection with configurable timing and thresholds. Its SHA-1 authentication also aids in meeting anti-counterfeiting requirements for medical and industrial battery packs, though final certification depends on full system validation.
BQ28Z620DRZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Balancing
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1 ~ 2
- Fault Protection:
- Over Current, Over Temperature, Over Voltage
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-VSON (2.5x4)
BQ28Z620DRZR FAQ
1.How can I place an order for BQ28Z620DRZR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ28Z620DRZR 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 BQ28Z620DRZR reliable?
The price and inventory of BQ28Z620DRZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ28Z620DRZR is usually 5 days.
3.What payment methods are accepted for BQ28Z620DRZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ28Z620DRZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ28Z620DRZR?
BQ28Z620DRZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ28Z620DRZR 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 BQ28Z620DRZR?
For technical support, including BQ28Z620DRZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ28Z620DRZR requirements.
6.How does Aetrix verify that BQ28Z620DRZR is sourced from the original manufacturer or authorized distributors?
All BQ28Z620DRZR 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 BQ28Z620DRZR meets industry standards.
7.What is the process for return or replacement of BQ28Z620DRZR?
All BQ28Z620DRZR units undergo pre-shipment inspection (PSI). If there is an issue with BQ28Z620DRZR, 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 BQ28Z620DRZR part is unused and in its original packaging.
Return procedure for BQ28Z620DRZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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