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Texas Instruments BQ3055DBTR
- Part No.:
- BQ3055DBTR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ3055DBTR.pdf
- Description:
- IC BAT MFUNC LI-ION 2-4C 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,474
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Product details
Overview
BQ3055DBTR from Texas Instruments is a fully integrated, single-chip battery pack manager and CEDV gas gauge IC for 2-, 3-, and 4-series Li-ion/Li-polymer battery packs. It provides hardware-based overcurrent/short-circuit protection, software-configurable voltage/current/temperature safety thresholds, integrated cell balancing, dual thermistor inputs (TS1/TS2), and SMBus v1.1 host interface - deployed in notebook PC battery packs requiring precise state-of-charge reporting and multi-level safety.
For engineers reviewing the BQ3055DBTR datasheet, BQ3055DBTR pinout, BQ3055DBTR application, or BQ3055DBTR equivalent, this page delivers verified functional roles, validated protection thresholds, confirmed TSSOP-30 package mapping, real-world use-case implementation context, and two technically documented alternative parts with explicit parameter and application differences.
Technical Context
The BQ3055DBTR 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 monitoring. Its analog front end includes a 16-bit coulomb counter (±0.25 mV offset, 15-bit effective resolution) and four 16-bit cell voltage inputs (VC1–VC4) supporting up to 4-series stacks with internal balancing FETs (RDS(ON) = 60–430 Ω).
Protection logic combines hardware-triggered discharge overcurrent (OCD, SCD1/SCD2) and charge short-circuit (SCC) detection with programmable thresholds (e.g., OCD trip range: 25–200 mV), plus software-managed 1st/2nd-level safety layers. SHA-1 authentication secures battery identity via dedicated SMBus commands and secure memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | VCC = 3.8 V to 25 V - supports full operation across 2S to 4S Li-ion packs (7.2 V to 16.8 V nominal) plus headroom for transient surges. |
| Coulomb Counter Resolution | 16-bit no-missing-codes, 15-bit effective signed resolution - enables sub-1% capacity estimation accuracy under dynamic load profiles. |
| Cell Voltage Inputs | VC1–VC4, 16-bit ADC, ±0.2 V to +8 V input range - measures individual cell voltages and enables per-cell balancing control. |
| Protection Response Time | OCD detect time ≤160 µs, SCD1 delay programmable down to 0 µs - meets IEC 62133 fast-fault shutdown requirements for portable equipment. |
| Low-Power Consumption | Sleep current <76 µA, shutdown current 3.7 µA - extends battery shelf life and enables always-on monitoring without significant drain. |
| SMBus Interface | v1.1 compliant, 10–100 kHz clock, 2-wire bidirectional - interoperates with standard system management controllers without protocol translation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade battery pack environments including medical and test instrumentation. |
Pinout & Package
Package: 30-pin TSSOP (DBT), body size 7.80 mm × 4.40 mm, thermal resistance RθJA = 73.1°C/W - optimized for compact smart battery modules with surface-mount assembly compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHG (Pin 1) | Charge FET gate drive output | Drives external high-side N-channel FET to enable/disable charging path; VOH ≥9.7 V at VCC > 8.4 V. |
| DSG (Pin 30) | Discharge FET gate drive output | Drives external low-side N-channel FET to control discharge path; output off-state voltage ≤ ±0.4 V. |
| VC1–VC4 (Pins 3–6) | Cell voltage sense inputs | Measure positive terminal of each series cell; support internal balancing FETs with RDS(ON) down to 60 Ω at 4 V. |
| SRP/SRN (Pins 9–10) | Differential current sense inputs | Interface to sense resistor (RSNS); 16-bit coulomb counter with ±10 µV offset and 0.5 µV/°C drift. |
| TS1/TS2 (Pins 8, 11) | Analog thermistor inputs | Internal 17.5-kΩ pullup enables NTC thermistor monitoring; 12-bit effective resolution over –40°C to +85°C. |
| SMBD/SMBC (Pins 13–15) | SMBus data/clock I/O | Open-drain, 5-V tolerant, 100-kHz max rate - connects directly to host controller without level-shifting. |
| REG33/REG25 (Pins 24, 22) | On-chip regulators | 3.3-V/2.5-V outputs (2 mA / 3 mA max) - power external circuitry or sensors, reducing BOM count. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced CEDV Gas Gauging | Compensated end-of-discharge voltage algorithm delivers <2% SoC error across temperature and aging - critical for runtime prediction in notebooks. |
| Hardware-Based Short-Circuit Protection | SCD1/SCD2 and SCC detection with sub-1-ms response and configurable thresholds - eliminates reliance on host firmware for critical fault handling. |
| Integrated Cell Balancing | Four independent internal balancing FETs (VC1–VC4) with programmable on-time - maintains cell voltage uniformity without external components. |
| SHA-1 Authentication | Secure memory and cryptographic engine validate genuine battery packs - prevents counterfeit insertion in OEM systems. |
| Dual Regulator Outputs | REG33 (3.3 V @ 2 mA) and REG25 (2.5 V @ 3 mA) reduce need for external LDOs - simplifies PCB layout and lowers system cost. |
Applications
| Notebook Battery Pack | Medical Portable Monitor |
|---|---|
Use Scenario: Smart battery module in 15.6-inch notebook with 3S Li-ion configuration and USB-C PD charging. IC Role / Device Role / Timing Role: Primary gas gauge and protection controller; manages CHG/DSG FETs, reports SoC/SOH via SMBus, executes JEITA-compliant charge algorithms. Use Value: Enables accurate runtime estimation (<2% error), prevents thermal runaway during fast charging, and supports OEM authentication to block third-party batteries. |
Use Scenario: Rechargeable battery pack for handheld ECG monitor requiring FDA-compliant safety and 12-month shelf life. IC Role / Device Role / Timing Role: Dual-thermistor (TS1/TS2) monitored pack manager; triggers hardware shutdown on overtemperature and logs cycle history in secure flash. Use Value: Meets IEC 62366 usability and IEC 62133 safety requirements through redundant hardware/software protection layers and tamper-proof logging. |
| Industrial Test Equipment | Portable Data Logger |
Use Scenario: Field-deployable multimeter with hot-swappable 4S Li-ion battery and Bluetooth telemetry. IC Role / Device Role / Timing Role: Battery pack manager with SMBus host interface; provides real-time voltage/current/temperature telemetry and adaptive charging based on ambient conditions. Use Value: Extends field service life via CEDV gauging under variable loads, supports JEITA temperature-compensated charging, and enables remote diagnostics via SMBus registers. |
Use Scenario: Environmental sensor node operating unattended for 6 months on a 2S Li-polymer pack with solar trickle charge. IC Role / Device Role / Timing Role: Ultra-low-power pack manager; uses sleep mode (<76 µA) between measurements and wakes on SMBus command or thermistor threshold breach. Use Value: Achieves >5-year calendar life via shutdown current of 3.7 µA and supports firmware updates over SMBus without external programming hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery pack manager applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ30Z55DBTR | Enhanced 32-bit MCU core, higher-resolution ADC (16-bit VC, 18-bit CC), extended SMBus command set, and improved CEDV modeling accuracy. | Targets premium notebooks and enterprise tablets requiring tighter SoC accuracy (<1%) and advanced diagnostics. | Select BQ30Z55DBTR when upgrading from BQ3055DBTR for higher precision gauging, longer flash endurance (100k cycles), and enhanced security features. |
| BQ20Z75DBTR | Legacy 16-bit architecture, no integrated cell balancing FETs, lower SMBus speed (up to 400 kHz), and no SHA-1 authentication engine. | Suitable for cost-sensitive 2S/3S applications where authentication and balancing are handled externally. | Choose BQ20Z75DBTR only for legacy redesigns where BOM cost reduction outweighs loss of integrated balancing and security. |
Compared with BQ3055DBTR, BQ30Z55DBTR offers superior gauging fidelity and security for next-gen platforms, while BQ20Z75DBTR provides basic functionality at lower cost but requires external components to match BQ3055DBTR's integrated protection and balancing capabilities.
Availability
BQ3055DBTR is available at Aetrix Electronics and suitable for notebook PCs, medical portable monitors, industrial test equipment, and portable data loggers requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical battery systems.
Supply support for BQ3055DBTR 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 solutions.
The BQ3055DBTR belongs to TI's bq™ family of battery fuel gauges and pack managers - designed specifically for safe, accurate, and authenticated operation in multi-cell Li-ion battery packs used in portable computing and portable medical devices.
FAQ
What is the primary function of the BQ3055DBTR in a battery pack?
The BQ3055DBTR serves as a fully integrated battery pack manager and CEDV gas gauge IC. It performs real-time cell voltage monitoring (VC1–VC4), coulomb counting (SRP/SRN), temperature sensing (TS1/TS2), hardware/software protection, cell balancing, and SMBus communication. In the BQ3055DBTR, these functions are consolidated into a single TSSOP-30 device to eliminate discrete protection ICs and external microcontrollers in 2–4S Li-ion packs.
Does the BQ3055DBTR support hardware-based short-circuit protection during charging?
Yes, the BQ3055DBTR includes dedicated hardware-based short-circuit protection for charging (SCC) with a programmable detection threshold ranging from –50 mV to –300 mV (depending on RSNS setting) and configurable delay steps down to 61 ms. This feature operates independently of firmware and triggers immediate FET shutdown, making it suitable for compliance with IEC 62133 safety standards in the BQ3055DBTR design.
What are the key low-power modes supported by the BQ3055DBTR?
The BQ3055DBTR supports three defined low-power states: Normal mode (ICC ≈ 160 µA), Sleep mode (<76 µA), and Shutdown mode (3.7 µA). Sleep mode retains RAM and real-time clock operation while disabling the CPU and analog peripherals; Shutdown mode preserves only critical registers and requires SMBus wake or PRES assertion to resume. These modes are explicitly characterized across –40°C to +85°C in the BQ3055DBTR datasheet.
Can the BQ3055DBTR perform cell balancing without external components?
Yes, the BQ3055DBTR integrates four independent N-channel balancing FETs connected to VC1–VC4 pins. Each FET supports programmable on-time and has RDS(ON) of 60–430 Ω depending on VDS, enabling passive cell balancing without external MOSFETs or resistors. This capability is confirmed in the BQ3055DBTR datasheet Section 6.16 and Functional Block Diagram.
Is SHA-1 authentication implemented in hardware within the BQ3055DBTR?
Yes, the BQ3055DBTR contains a dedicated hardware SHA-1 engine and secure memory block for cryptographic key storage and challenge-response authentication. This allows OEMs to verify genuine battery packs at system boot or during SMBus communication - a feature explicitly documented in the BQ3055DBTR Features list and Section 8.3 of the datasheet.
BQ3055DBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-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:
- 30-TSSOP
BQ3055DBTR FAQ
1.How can I place an order for BQ3055DBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ3055DBTR 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 BQ3055DBTR reliable?
The price and inventory of BQ3055DBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ3055DBTR is usually 5 days.
3.What payment methods are accepted for BQ3055DBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ3055DBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ3055DBTR?
BQ3055DBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ3055DBTR 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 BQ3055DBTR?
For technical support, including BQ3055DBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ3055DBTR requirements.
6.How does Aetrix verify that BQ3055DBTR is sourced from the original manufacturer or authorized distributors?
All BQ3055DBTR 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 BQ3055DBTR meets industry standards.
7.What is the process for return or replacement of BQ3055DBTR?
All BQ3055DBTR units undergo pre-shipment inspection (PSI). If there is an issue with BQ3055DBTR, 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 BQ3055DBTR part is unused and in its original packaging.
Return procedure for BQ3055DBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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