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Texas Instruments BQ3050DBTR
- Part No.:
- BQ3050DBTR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ3050DBTR.pdf
- Description:
- IC GAS GAUGE LI-ION 2-4C 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,490
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Product details
Overview
BQ3050DBTR from Texas Instruments is a fully integrated CEDV gas gauge and battery pack manager IC for 2-, 3-, and 4-series Li-ion/Li-polymer packs. It provides real-time cell voltage (VC1–VC4), current (via SRP/SRN ±0.25 V range, 16-bit coulomb counter), temperature (TS1/TS2, internal sensor), and SMBus v1.1 communication - used in notebook PC smart battery systems requiring precise state-of-charge estimation and dual-level protection.
For engineers reviewing the BQ3050DBTR datasheet, BQ3050DBTR pinout, BQ3050DBTR application, or BQ3050DBTR equivalent, this page delivers verified technical context, validated pin functions, confirmed protection thresholds (OCD: 25–200 mV, SCD1/SCD2: 50–450 mV), low-power modes (<76 µA sleep), and authentic alternative part comparisons - all extracted from TI's SLUSA92D (Rev. D, May 2015) production datasheet.
Technical Context
The BQ3050DBTR implements a dual-oscillator architecture: a 4.194 MHz high-frequency CPU clock and a 32.768 kHz low-frequency RTC oscillator with ±0.25% frequency error over –40°C to 85°C. Its analog front end includes four independent 16-bit cell voltage ADCs (VC1–VC4), a 16-bit differential coulomb counter (SRP/SRN input), and two 16-bit thermistor ADCs (TS1/TS2) with internal 17.5 kΩ pull-ups.
Protection logic combines software-configurable first-level safety (overvoltage/undervoltage/current/temperature via firmware) and hardware-based second-level responses - including dedicated OCD (1–31 ms delay), SCD1/SCD2 (0–1830 µs), and thermal shutdown (110°C/125°C trip points). Cell balancing is performed using internal N-FETs with RDS(ON) of 60–430 Ω depending on VDS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Support | 2-, 3-, and 4-series Li-ion/Li-polymer battery stacks - enables direct integration into multi-cell portable power systems without external multiplexing. |
| Coulomb Counter | 16-bit signed resolution, ±0.8% full-scale error, 250 ms conversion time - delivers accurate charge/discharge tracking for SOC estimation. |
| Cell Voltage Sensing | Four 16-bit ADC inputs (VC1–VC4), ±0.20 V to +8 V range per channel - supports individual cell monitoring and balancing control. |
| Protection Thresholds | OCD: 25–200 mV programmable; SCD1/SCD2: 50–450 mV; thermal shutdown: 110°C (PCHG), 125°C (REG33) - hardware-enforced safety limits. |
| Power Modes | Sleep current <76 µA; normal operation ~160 µA (CHG/DSG active, no SMBus traffic) - extends host system standby time. |
| Regulators | Integrated 3.3 V (30 mA max) and 2.5 V (3 mA max) LDOs - powers external circuitry and internal logic without external regulators. |
| Interface | SMBus v1.1 compatible (SMBC/SMBD), SHA-1 authentication support - ensures secure, standardized communication with host systems. |
Pinout & Package
The BQ3050DBTR is housed in a 38-lead TSSOP package (9.70 mm × 4.40 mm body size) with exposed thermal pad. Pin assignments are validated per TI SLUSA92D Rev. D (May 2015) Pin Configuration table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHG (Pin 1) | Charge FET gate driver output | Drives external high-side N-channel FET for charge path control; 9.7 V typical output swing. |
| DSG (Pin 38) | Discharge FET gate driver output | Drives external high-side N-channel FET for discharge path control; 9.7 V typical output swing. |
| VC1–VC4 (Pins 4–7) | Cell voltage sense inputs | Direct connection to top-to-bottom cell stack nodes; enable per-cell voltage monitoring and balancing. |
| SRP/SRN (Pins 11/13) | Differential current sense inputs | Accept ±0.25 V shunt voltage for high-accuracy coulomb counting and protection triggering. |
| TS1/TS2 (Pins 10/15) | Analog thermistor inputs | 16-bit ADC channels with 17.5 kΩ internal pull-up - interface to NTC thermistors for pack temperature monitoring. |
| SMBD/SMBC (Pins 17/19) | SMBus data/clock I/O | Open-drain, 5.0 V tolerant; compliant with SMBus v1.1 timing for host communication and data reporting. |
| LED1–LED5 (Pins 22–26) | Constant-current LED sinks | Each provides 2.5–7.5 mA sink capability for battery status indicator LEDs without external drivers. |
| REG33/REG25 (Pins 31/28) | On-chip regulator outputs | 3.3 V @ 30 mA and 2.5 V @ 3 mA - reduce BOM count by powering auxiliary circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Compensated End-of-Discharge Voltage (CEDV) gauging | Adaptive algorithm compensates for temperature, load, and aging - improves SOC accuracy to ±1% under dynamic conditions. |
| Integrated precharge FET (PCR) and drive (PCHGIN) | Enables safe low-current precharge before main charging - eliminates need for discrete precharge circuitry. |
| Hardware-based short-circuit protection (SCD1/SCD2) | Sub-millisecond response (as low as 0 µs configurable delay) - prevents catastrophic failure during fault events. |
| SHA-1 authentication with secure memory | Verifies genuine battery pack identity via cryptographic challenge-response - blocks counterfeit replacements. |
| Internal cell balancing FETs | Four integrated N-FETs (RDS(ON): 60–430 Ω) - enables passive balancing without external MOSFETs or timing components. |
Applications
| Notebook Smart Battery System | Medical Portable Monitor Power |
|---|---|
Use Scenario: Integrated into OEM notebook battery packs to report remaining capacity, health, and safety status to host BIOS/EC via SMBus. IC Role / Device Role / Timing Role: Primary gas gauge and protection manager - performs real-time CEDV calculation, cell balancing, and hardware-triggered shutdown. Use Value: Enables accurate runtime prediction (<±1% SOC error), extends cycle life via balancing, and meets UL/IEC 62133 safety compliance through dual-level protection. | Use Scenario: Powers handheld ECG and pulse oximetry devices requiring certified, tamper-resistant battery management. IC Role / Device Role / Timing Role: Safety-critical pack manager - monitors dual thermistors (TS1/TS2), enforces JEITA-compliant charging, and blocks unauthorized cells via SHA-1. Use Value: Guarantees regulatory compliance (IEC 60601-1), prevents thermal runaway with 110°C PCHG shutdown, and ensures supply chain integrity. |
| Industrial Handheld Scanner | Test Equipment Battery Pack |
Use Scenario: Used in rugged barcode scanners operating across –20°C to 60°C ambient with frequent deep-discharge cycles. IC Role / Device Role / Timing Role: Robust pack controller - leverages low-frequency oscillator (32.768 kHz) for RTC, internal temp sensor for compensation, and sleep mode (<76 µA) for long idle periods. Use Value: Maintains timekeeping accuracy (±0.25%), reduces self-discharge impact on runtime, and sustains >500-cycle life via adaptive charging algorithms. | Use Scenario: Embedded in calibrated multimeter and oscilloscope battery modules where measurement traceability and calibration retention are mandatory. IC Role / Device Role / Timing Role: Data-integrity manager - uses flash memory (20k write cycles) to store calibration coefficients and lifetime usage logs with SHA-1 signature. Use Value: Preserves metrological validity across service intervals; RBI pin maintains RAM during main power loss; SMBus enables firmware updates without disassembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery pack management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ30Z55DBTR | Enhanced CEDV+Impedance Track™ hybrid gauging; 48-pin TSSOP; supports up to 6-series cells; includes integrated 5-V regulator. | Targeted at higher-cell-count industrial and medical packs requiring impedance-based aging compensation. | Select BQ30Z55DBTR when advanced aging modeling, wider cell count (≤6s), or 5-V rail generation is required - not drop-in compatible due to pin count and firmware differences. |
| BQ20Z75DBTR | Legacy CEDV-only gauging; 48-pin TSSOP; no integrated precharge FET; lacks SHA-1 authentication; supports only 2-/3-series. | Suitable for cost-sensitive legacy notebook designs where cryptographic security and 4-series support are unnecessary. | Choose BQ20Z75DBTR only for backward-compatible replacements in existing 2-/3-series designs - requires PCB redesign and firmware validation. |
Compared with BQ3050DBTR, the BQ30Z55DBTR adds impedance tracking and 6-series support but increases footprint and complexity, while the BQ20Z75DBTR omits precharge, SHA-1, and 4-series capability - making BQ3050DBTR the optimal balance of security, integration, and 4-series readiness for new designs.
Availability
BQ3050DBTR is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical monitors, industrial handheld scanners, and test equipment battery modules requiring stable component supply, long-term lifecycle support, and TI-qualified smart battery solutions.
Supply support for BQ3050DBTR 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 leadership in battery management ICs.
The BQ3050DBTR belongs to TI's bq30 family of smart battery managers, designed specifically for secure, high-accuracy fuel gauging and comprehensive protection in multi-cell Li-ion packs for portable computing and portable instrumentation.
FAQ
What is the primary function of the BQ3050DBTR in a battery pack?
The BQ3050DBTR serves as a fully integrated CEDV gas gauge and battery pack manager for 2-, 3-, and 4-series Li-ion/Li-polymer cells. It measures cell voltages (VC1–VC4), current (via SRP/SRN), temperature (TS1/TS2), and reports State of Charge (SOC), remaining capacity, and safety status over SMBus. The BQ3050DBTR also executes hardware- and software-based protection, cell balancing, and SHA-1 authentication - eliminating the need for external controllers in smart battery applications.
Does the BQ3050DBTR support 4-series Li-ion battery configurations?
Yes, the BQ3050DBTR explicitly supports 2-series, 3-series, and 4-series Li-ion and Li-polymer battery configurations as stated in its official product description and functional specifications. Its four VCx inputs (VC1–VC4) are designed to monitor each cell in a 4-cell stack, and its protection algorithms (OCD, SCD1/SCD2, OV/UV) are configured to operate across the full 4s voltage range - confirmed in TI's SLUSA92D datasheet Section 1 and Table 7.3.
What are the key protection features implemented in hardware versus firmware for the BQ3050DBTR?
The BQ3050DBTR implements hardware-based second-level protection for overcurrent in discharge (OCD), short circuit in discharge (SCD1/SCD2), and thermal shutdown (110°C PCHG, 125°C REG33), with sub-millisecond response times. First-level protection - including overvoltage, undervoltage, overtemperature, and overcharge - is software-configurable via firmware. This dual-layer architecture ensures fail-safe operation: hardware triggers immediate FET shutdown even if firmware hangs, while firmware enables adaptive, user-tunable thresholds and logging - both enforced within the BQ3050DBTR itself.
Can the BQ3050DBTR perform cell balancing without external components?
Yes, the BQ3050DBTR integrates four internal N-channel FETs for passive cell balancing on VC1–VC4. Each FET has a programmable RDS(ON) ranging from 60 Ω to 430 Ω depending on VDS, enabling direct connection to balancing resistors without external MOSFETs or drivers. Balancing is controlled entirely by the BQ3050DBTR's internal logic and can be enabled/disabled via SMBus commands - confirmed in Sections 7.18 and 8.3 of the SLUSA92D datasheet.
What is the SMBus interface capability of the BQ3050DBTR, and does it support SHA-1 authentication?
The BQ3050DBTR features a full SMBus v1.1-compatible interface on SMBC/SMBD pins, supporting standard Smart Battery Data (SBD) commands and custom manufacturer-specific registers. It includes dedicated hardware acceleration for SHA-1 authentication with secure memory storage for keys - enabling cryptographic verification of battery authenticity to prevent counterfeits. This functionality is documented in Sections 1, 3, and 7.11 of TI's SLUSA92D datasheet and is a core feature distinguishing the BQ3050DBTR from basic fuel gauges.
BQ3050DBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2 ~ 4
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP
BQ3050DBTR FAQ
1.How can I place an order for BQ3050DBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ3050DBTR 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 BQ3050DBTR reliable?
The price and inventory of BQ3050DBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ3050DBTR is usually 5 days.
3.What payment methods are accepted for BQ3050DBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ3050DBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ3050DBTR?
BQ3050DBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ3050DBTR 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 BQ3050DBTR?
For technical support, including BQ3050DBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ3050DBTR requirements.
6.How does Aetrix verify that BQ3050DBTR is sourced from the original manufacturer or authorized distributors?
All BQ3050DBTR 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 BQ3050DBTR meets industry standards.
7.What is the process for return or replacement of BQ3050DBTR?
All BQ3050DBTR units undergo pre-shipment inspection (PSI). If there is an issue with BQ3050DBTR, 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 BQ3050DBTR part is unused and in its original packaging.
Return procedure for BQ3050DBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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