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Texas Instruments BQ20Z40PWR
- Part No.:
- BQ20Z40PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ20Z40PWR.pdf
- Description:
- IC GAS GAUGE LI-ION 2-4C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,639
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Product details
Overview
BQ20Z40PWR from Texas Instruments is an SBS 1.1-compliant gas gauge IC with Impedance Track™ technology, designed for battery-pack integration in 2–4 series Li-ion/Li-polymer systems. It delivers better than 1% gas-gauge accuracy over battery lifetime, supports SHA-1 authentication, and operates with the bq29330 analog front-end for full protection functionality.
For engineers reviewing the BQ20Z40PWR datasheet, BQ20Z40PWR pinout, BQ20Z40PWR application, or BQ20Z40PWR equivalent, this device serves as a legacy smart battery fuel gauge requiring SMBus v1.1 interface, dual thermistor monitoring, coulomb counting via integrated delta-sigma ADC, and configurable safety thresholds for voltage, current, and temperature.
Technical Context
The BQ20Z40PWR implements a dedicated 8-bit RISC CPU with ultralow-power sleep and shutdown modes, and integrates two delta-sigma ADCs: one for bipolar current sensing (±0.2 V range) across SRP/SRN, and another for cell voltage, pack voltage, and temperature measurement. It relies on external bq29330 AFE for cell balancing, FET control, and high-side protection functions.
Gas gauging uses patented Impedance Track™ algorithm that continuously models battery impedance to compensate for discharge rate, temperature, and aging-enabling accurate remaining capacity calculation without full-charge/discharge learning cycles. Communication occurs exclusively over SMBus v1.1 with PEC support and master/slave capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4 V to 2.6 V - fixed low-voltage operation requiring stable LDO or regulated source |
| Operating Current | 400 mA (bq20z40 only) - enables continuous real-time gauging and protection decisions |
| Coulomb Counter Accuracy | ±0.034% INL - ensures precise charge/discharge integration for lifetime capacity tracking |
| SMBus Frequency | 10–100 kHz - compatible with standard SBS-compliant host controllers and battery management firmware |
| Temperature Range | –40°C to +85°C - supports industrial and portable equipment operating in extended environments |
| Package | 20-pin TSSOP (PW) - surface-mount footprint with 0.65 mm pitch, RoHS-compliant NIPDAU finish |
| Data Retention | 10 years - guarantees long-term logging of lifetime max/min voltage, temperature, and current values |
Pinout & Package
20-pin TSSOP (PW) package with 0.65 mm lead pitch, 6.4 mm × 4.4 mm body size, and 1.2 mm maximum height. RoHS-compliant NIPDAU lead finish, MSL Level-1, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 XALERT | Input from bq29330 | Signals fault condition from AFE; triggers secondary protection response |
| 2 TS2 / 3 TS1 | Analog thermistor inputs | Support dual NTC sensors for independent charge/discharge thermal monitoring |
| 4 CLKOUT | 32.768 kHz output | Drives bq29330 clock input; enables synchronized timing for protection logic |
| 6 PFIN | Secondary protector status input | Allows reporting of 2nd-level protection activation (e.g., fuse blow) |
| 7 SAFE | Active-high safety output | Directly controls external fuse or latch circuit for irreversible pack disable |
| 8 SMBD / 10 SMBC | SMBus data/clock | Open-drain bidirectional interface compliant with SBS v1.1 and PEC protocol |
| 14 SRP / 15 SRN | Current sense differential inputs | Accept ±0.2 V signal across 5–20 mΩ shunt for high-accuracy coulomb counting |
| 19 VCELL+ / 20 VCELL− | Scaled cell voltage inputs | Receive multiplexed cell voltage readings from bq29330 for Impedance Track™ modeling |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ gas gauging | Delivers <1% error over battery lifetime without calibration cycles by modeling impedance vs. SOC, temperature, and aging |
| Dual thermistor support | Enables independent thermal profiling for charge and discharge paths using TS1/TS2 pins |
| Configurable safety hierarchy | Separates primary (recoverable) and secondary (latchable) protection with distinct thresholds and outputs |
| Lifetime data logging | Stores 12+ critical metrics (e.g., lifetime min/max cell voltage, avg discharge power) in nonvolatile flash memory |
| SHA-1 authentication | Prevents unauthorized host access or firmware tampering via cryptographic challenge-response handshake |
Applications
| Notebook PC Battery Packs | Medical Portable Equipment |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for business-class laptops with SBS-compliant charging systems. IC Role / Device Role / Timing Role: Primary gas gauge and safety manager; communicates state-of-charge, health, and faults over SMBus to system EC. Use Value: Enables accurate runtime estimation and prevents unsafe operation during high-current discharge or elevated ambient temperatures. |
Use Scenario: Embedded in sealed battery modules for portable ultrasound or infusion pumps requiring regulatory-compliant safety logging. IC Role / Device Role / Timing Role: Dual-role fuel gauge and JEITA-compliant charger coordinator; manages temperature-dependent CV/CC profiles. Use Value: Meets IEC 62368-1 requirements via lifetime data logging and dual-level thermal protection with independent alarm thresholds. |
| Test & Measurement Instruments | Industrial Handheld Terminals |
Use Scenario: Used in rechargeable battery packs for portable oscilloscopes and multimeters with extended field service life. IC Role / Device Role / Timing Role: Smart battery controller interfacing with host MCU via SMBus; performs autonomous cell balancing during charge. Use Value: Extends usable pack energy by reducing inter-cell voltage imbalance at full charge, delaying premature termination. |
Use Scenario: Deployed in ruggedized handheld scanners and mobile computers operating in warehouse or logistics environments. IC Role / Device Role / Timing Role: System-present-aware fuel gauge; enters low-power sleep mode when removed and wakes on current detection. Use Value: Reduces quiescent current to 8 mA (sleep) or 0.2 mA (shutdown), preserving shelf life during storage or infrequent use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart battery fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z65-R1 | Successor IC with enhanced Impedance Track™, integrated AFE, and 128-word EEPROM; supports up to 4-series cells | Eliminates need for external bq29330; reduces BOM count and PCB area | Recommended for new designs requiring higher integration and longer production support |
| BQ20Z75-V160 | Later-generation variant with extended temperature range (–40°C to +105°C), improved SMBus timing margins, and updated SHA-1 key handling | Validated for automotive-grade thermal cycling and extended-life industrial deployments | Preferred where extended reliability validation or wider ambient operation is required |
Compared with BQ20Z40PWR, the BQ20Z65-R1 removes dependency on external AFE while improving accuracy and memory depth, whereas the BQ20Z75-V160 extends environmental robustness and cryptographic security-both require firmware adaptation but offer longer lifecycle availability.
Availability
BQ20Z40PWR is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable equipment, test instrumentation, and industrial handheld terminals requiring stable component supply despite its Not Recommended for New Designs (NRND) status.
Supply support for BQ20Z40PWR 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 company specializing in analog and embedded processing technologies, with leadership in battery management, power conversion, and signal chain solutions.
The BQ20Z40PWR belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for SBS-compliant Li-ion battery packs requiring high-accuracy gauging, multi-level safety enforcement, and lifetime data integrity in portable computing and medical applications.
FAQ
What is the primary function of the BQ20Z40PWR in a battery pack?
The BQ20Z40PWR serves as an SBS 1.1-compliant gas gauge and safety manager. It measures cell voltages, pack current, and temperature; calculates remaining capacity using Impedance Track™ technology; enforces primary and secondary protection thresholds; and reports all data over SMBus. The BQ20Z40PWR requires pairing with the bq29330 AFE for full functionality.
Does the BQ20Z40PWR integrate its own analog front-end, or does it require external components?
The BQ20Z40PWR does not integrate a complete analog front-end. It relies on the external bq29330 IC for cell balancing, FET drive, high-side voltage monitoring, and overvoltage/overcurrent protection. The BQ20Z40PWR provides the computation engine, SMBus interface, and safety logic-but must be used with bq29330 to implement full smart battery functionality.
What communication interface does the BQ20Z40PWR use, and what protocol compliance does it support?
The BQ20Z40PWR uses a two-wire SMBus v1.1 interface with open-drain SMBC and SMBD pins, supporting packet error checking (PEC). It fully complies with the Smart Battery Specification v1.1, enabling interoperability with standard SBS hosts for commands like RemainingCapacity, BatteryStatus, CellVoltage1–4, and SafetyStatus.
How does the Impedance Track™ technology in the BQ20Z40PWR improve fuel gauging accuracy?
Impedance Track™ continuously models battery impedance across temperature, state-of-charge, and cycle life to correct coulomb counting errors. Unlike traditional voltage-based methods, it accounts for dynamic load effects and aging-achieving better than 1% error over the battery's lifetime without requiring periodic full-charge calibration cycles. This behavior is intrinsic to the BQ20Z40PWR's embedded algorithm.
Is the BQ20Z40PWR still recommended for new designs, and what are the implications of its NRND status?
No-the BQ20Z40PWR is marked "Not Recommended for New Designs" by Texas Instruments. While actively manufactured and available through authorized channels, TI advises migration to successors like BQ20Z65-R1 or BQ20Z75-V160 for long-term design assurance, extended support, and enhanced features. Existing BQ20Z40PWR designs remain viable but should plan for eventual obsolescence mitigation.
BQ20Z40PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2 ~ 4
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
BQ20Z40PWR FAQ
1.How can I place an order for BQ20Z40PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ20Z40PWR 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 BQ20Z40PWR reliable?
The price and inventory of BQ20Z40PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ20Z40PWR is usually 5 days.
3.What payment methods are accepted for BQ20Z40PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ20Z40PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ20Z40PWR?
BQ20Z40PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ20Z40PWR 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 BQ20Z40PWR?
For technical support, including BQ20Z40PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ20Z40PWR requirements.
6.How does Aetrix verify that BQ20Z40PWR is sourced from the original manufacturer or authorized distributors?
All BQ20Z40PWR 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 BQ20Z40PWR meets industry standards.
7.What is the process for return or replacement of BQ20Z40PWR?
All BQ20Z40PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ20Z40PWR, 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 BQ20Z40PWR part is unused and in its original packaging.
Return procedure for BQ20Z40PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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