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Texas Instruments BQ3055DBT
- Part No.:
- BQ3055DBT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ3055DBT.pdf
- Description:
- IC BAT MFUNC LI-ION 2-4C 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,692
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Product details
Overview
BQ3055DBT from Texas Instruments is a fully integrated, single-chip battery pack manager and CEDV gas gauge for 2-, 3-, and 4-series Li-ion/Li-polymer battery packs. It provides hardware-based overcurrent protection, software-configurable voltage/temperature/current safety thresholds, integrated cell balancing, dual regulated outputs (3.3 V/2.5 V), and SMBus v1.1 interface - deployed in notebook PC smart battery systems.
For engineers reviewing the BQ3055DBT datasheet, BQ3055DBT pinout, BQ3055DBT application, or BQ3055DBT equivalent, this page delivers verified technical context, validated pin functions, confirmed protection thresholds, real-world use cases, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The BQ3055DBT implements a dual-oscillator architecture: a 4.194 MHz high-frequency oscillator for CPU timing and a 32.768 kHz low-frequency oscillator for RTC and low-power wake-up. Its analog front end includes a 16-bit coulomb counter with ±10 µV offset error and 15-bit effective resolution, plus four independent cell voltage inputs (VC1–VC4) supporting up to 4-series stacks with internal balancing FETs (RDS(ON) = 60–430 Ω).
Protection logic combines programmable software-level safeguards (OVD/UVD/OCD/SCD/SCC) with hardware-triggered fast-response circuits - including sub-160 µs current fault detection and <5 µs thermal shutdown activation. The device supports SHA-1 authentication via secure memory and operates across –40°C to +85°C with dual low-power modes (<76 µA sleep, <180 µA low-power).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Support | 2-, 3-, or 4-series Li-ion/Li-polymer stacks - enables scalable battery pack design without firmware rework. |
| Coulomb Counter | 16-bit resolution, ±10 µV offset, 15-bit effective resolution - ensures accurate capacity tracking over temperature and aging. |
| Protection Response | <160 µs current fault detect time, <5 µs thermal shutdown - meets IEC 62133 fast-fault requirements. |
| Regulators | 3.3 V @ 2 mA (±3.5% line/load regulation), 2.5 V @ 3 mA (±2.5% line/load regulation) - powers external sensors and logic without external LDOs. |
| Power Modes | Sleep mode: <76 µA; Low-power mode: <180 µA - extends shelf life and reduces standby drain in disconnected battery packs. |
| SMBus Interface | v1.1 compliant, 10–100 kHz clock range, 25–35 ms timeout - interoperates with standard SBS-compliant host controllers. |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable computing environments with wide ambient variation. |
Pinout & Package
The BQ3055DBT is housed in a 30-lead TSSOP (DBT) package measuring 7.80 mm × 4.40 mm, optimized for compact smart battery modules with minimal PCB footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHG | Charge N-FET gate drive | Drives external high-side N-channel FET for charge path control; output voltage ≥9.7 V when enabled. |
| DSG | Discharge N-FET gate drive | Drives external low-side N-channel FET for discharge path control; output voltage ≥9.7 V when enabled. |
| VC1–VC4 | Cell voltage sensing inputs | Four differential inputs for monitoring individual cell voltages in 2–4 series stacks; support internal balancing FETs. |
| SRP / SRN | Differential coulomb counter inputs | High-precision sense inputs (±0.25 V range) for shunt-based current measurement with 16-bit ADC resolution. |
| TS1 / TS2 | Thermistor inputs | Analog inputs for dual NTC thermistors; include 17.5 kΩ internal pullup and 12-bit effective resolution. |
| SMBD / SMBC | SMBus data/clock lines | Open-drain bidirectional interface compliant with SMBus v1.1; supports 10–100 kHz operation and SBS command set. |
| REG33 / REG25 | Regulated power outputs | Stable 3.3 V (2 mA max) and 2.5 V (3 mA max) supplies for external circuitry; reduce BOM count and layout complexity. |
| PRES | Host presence input | Digital input signaling host system readiness; used to enable/disable gauging and communication during insertion/removal. |
| RBI | RAM backup supply | Backup power input for retaining RAM data during main supply loss; requires ≥1 V and draws ≤1100 nA. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced CEDV Gas Gauging | Compensated end-of-discharge voltage algorithm delivers state-of-charge accuracy within ±1% over full cycle life and temperature range. |
| Hardware-Based Protection | Dedicated analog comparators trigger <5 µs thermal shutdown and <160 µs current fault response - independent of firmware execution. |
| Integrated Cell Balancing | Four internal balancing FETs (RDS(ON) = 60–430 Ω) enable passive top-balancing per cell without external components. |
| SHA-1 Authentication | Secure memory with cryptographic key storage prevents counterfeit battery pack substitution in OEM systems. |
| Dual Low-Power Modes | Sleep mode (≤76 µA) and low-power mode (≤180 µA) extend battery shelf life while maintaining real-time clock and wake capability. |
Applications
| Notebook Smart Battery Pack | Medical Portable Monitor |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for Windows-based laptops with SBS-compliant host firmware. IC Role / Device Role / Timing Role: Primary gas gauge and protection controller; manages cell balancing, reports SOC/SOH via SMBus, and enforces JEITA-compliant charging. Use Value: Enables precise runtime prediction, prevents overvoltage/overcurrent faults, and supports OEM authentication to block third-party batteries. |
Use Scenario: Power management subsystem in Class II medical devices requiring UL 2054 and IEC 62133 compliance. IC Role / Device Role / Timing Role: Safety-critical battery monitor with hardware-triggered shutdown; uses dual temperature inputs (TS1/TS2) and redundant voltage monitoring (VC1–VC4). Use Value: Meets medical-grade fault response timing (<5 µs thermal, <160 µs current) and supports secure firmware updates via authenticated SMBus commands. |
| Industrial Handheld Scanner | Test Equipment Battery Module |
Use Scenario: Ruggedized barcode scanner operating in warehouse environments with frequent deep discharge cycles. IC Role / Device Role / Timing Role: Pack-level manager handling adaptive charging, coulomb counting, and 4-cell voltage balancing under variable load profiles. Use Value: Maintains ±1% SOC accuracy after 500+ cycles and extends usable capacity via active cell balancing during idle periods. |
Use Scenario: Calibration-grade portable oscilloscope or multimeter requiring stable runtime and traceable battery health metrics. IC Role / Device Role / Timing Role: High-accuracy gauging engine with 16-bit coulomb counter and internal 1.225 V reference (±80 ppm/°C drift). Use Value: Delivers lab-grade capacity reporting with <10 µV offset error and supports firmware logging of voltage/temperature history for calibration audits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery pack manager applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ3060DBT | Enhanced flash endurance (50k write cycles vs. 20k), added I²C support, improved JEITA profile flexibility. | Preferred for new designs requiring extended field firmware updates or dual-interface flexibility. | Select BQ3060DBT if future-proofing against firmware revision frequency or needing I²C fallback is critical. |
| BQ34Z100-G1 | Standalone impedance-track fuel gauge (no integrated protection FET drivers); supports >16-series stacks via daisy-chain. | Used where protection is handled externally (e.g., by discrete FETs + MCU), and higher cell count or impedance modeling is required. | Choose BQ34Z100-G1 only when separating gauging and protection functions improves system-level safety certification path. |
Compared with BQ3055DBT, the BQ3060DBT offers greater flash longevity and interface flexibility but shares identical pinout and protection architecture; the BQ34Z100-G1 removes integrated FET drivers entirely, shifting protection responsibility to external circuitry while enabling higher-series scalability.
Availability
BQ3055DBT 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 and long-term lifecycle support.
Supply support for BQ3055DBT 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 precision analog ICs.
The BQ3055DBT belongs to TI's bq™ family of battery management ICs, engineered specifically for cost-sensitive, space-constrained smart battery applications demanding integrated gauging, protection, and authentication in a single chip.
FAQ
What is the primary function of the BQ3055DBT in a battery pack?
The BQ3055DBT serves as a fully integrated battery pack manager and CEDV gas gauge for 2–4 series Li-ion/Li-polymer cells. It performs real-time state-of-charge calculation, hardware- and software-based safety protection, cell voltage monitoring, passive balancing, and SMBus communication - all within a single 30-pin TSSOP package. The BQ3055DBT eliminates the need for discrete protection ICs and external regulators in compact smart battery designs.
Does the BQ3055DBT support SHA-1 authentication, and how is it implemented?
Yes, the BQ3055DBT includes dedicated hardware for SHA-1 authentication using secure memory to store cryptographic keys. This enables OEMs to verify genuine battery packs by validating digital signatures during SMBus handshake sequences - preventing unauthorized or counterfeit replacements. The BQ3055DBT implements this via on-chip secure ROM and dedicated crypto engine, not software emulation.
What are the key power consumption modes of the BQ3055DBT, and what are their typical currents?
The BQ3055DBT features three defined power states: normal operation (160–410 µA), low-power mode (<180 µA), and sleep mode (<76 µA). Sleep mode retains RAM content and maintains RTC functionality while minimizing quiescent draw - critical for long-term battery shelf life. All modes are configurable via SMBus commands, and the BQ3055DBT automatically enters low-power mode when host communication is inactive.
Can the BQ3055DBT drive external MOSFETs directly, and what are its FET drive capabilities?
Yes, the BQ3055DBT integrates dedicated gate drivers for CHG (charge), DSG (discharge), PCHG (precharge), and FUSE control. CHG and DSG outputs deliver ≥9.7 V gate drive with rise/fall times of 200–1400 µs depending on VCC and load. The BQ3055DBT supports both high-side N-channel (CHG) and low-side N-channel (DSG) configurations, eliminating need for external level shifters or driver ICs in standard smart battery topologies.
What temperature ranges and accuracy does the internal temperature sensor provide in the BQ3055DBT?
The BQ3055DBT includes an internal diode-based temperature sensor with ±10°C accuracy from –40°C to +85°C and 11–12-bit effective resolution. Its output is calibrated to –2 mV/°C, and conversion time is 16 ms. For higher accuracy, the BQ3055DBT also supports two external NTC thermistors via TS1 and TS2 pins - each with 17.5 kΩ internal pullup and 12-bit effective resolution - enabling dual-point thermal monitoring essential for medical and industrial applications.
BQ3055DBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 30-TSSOP
BQ3055DBT FAQ
1.How can I place an order for BQ3055DBT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ3055DBT 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 BQ3055DBT reliable?
The price and inventory of BQ3055DBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ3055DBT is usually 5 days.
3.What payment methods are accepted for BQ3055DBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ3055DBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ3055DBT?
BQ3055DBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ3055DBT 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 BQ3055DBT?
For technical support, including BQ3055DBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ3055DBT requirements.
6.How does Aetrix verify that BQ3055DBT is sourced from the original manufacturer or authorized distributors?
All BQ3055DBT 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 BQ3055DBT meets industry standards.
7.What is the process for return or replacement of BQ3055DBT?
All BQ3055DBT units undergo pre-shipment inspection (PSI). If there is an issue with BQ3055DBT, 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 BQ3055DBT part is unused and in its original packaging.
Return procedure for BQ3055DBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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