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Texas Instruments BQ78350DBT-R1A
- Part No.:
- BQ78350DBT-R1A
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ78350DBT-R1A.pdf
- Description:
- IC BATT MON LI-ION 3-15C 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:581
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Product details
Overview
BQ78350DBT-R1A from Texas Instruments is a Li-ion/LiFePO₄ battery management controller and fuel gauge companion to the BQ769x0 analog front-end (AFE), providing CEDV-based state-of-charge estimation, SMBus 1.1 host interface, 16-bit ADC for voltage/current/temperature acquisition, lifetime data logging, and dual-level (primary + secondary) protection for 3–15-series battery packs up to 320 Ah - deployed in e-bikes, power tools, and UPS systems.
For engineers reviewing the BQ78350DBT-R1A datasheet, BQ78350DBT-R1A pinout, BQ78350DBT-R1A application, or BQ78350DBT-R1A equivalent, key selection criteria include its TSSOP-30 package with integrated coulomb counting, programmable SMBus slave address via SMBA, dual safety architecture (SAFE pin for fuse blow), LED/LCD display support, and SHA-1 authentication for secure battery authentication.
Technical Context
The BQ78350DBT-R1A operates as a system-level BMS controller that offloads fuel gauging, protection logic, and data logging from the BQ769x0 AFE while communicating over dedicated SDA/SCL lines. Its CoolRISC CPU executes CEDV algorithm using 16-bit ADC measurements of BAT (translated pack voltage), VAUX (auxiliary voltage), and thermistor inputs relayed from the AFE.
It implements three power modes - NORMAL (1-s update interval), SLEEP (user-adjustable), and SHUTDOWN (<1 µA) - with PWRM pin signaling mode status. Protection decisions are split across primary (cell OVP/UVP, OC, OT/UT) and secondary (safety OVP/UVP, FET fault, imbalance detection) levels, with SAFE pin driving external fuse control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4 V to 2.6 V - tight regulation required; supports low-power operation without LDO overhead |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable EV applications including e-bikes and power tools |
| ADC Resolution | 16-bit with 13–14-bit effective resolution - enables precise cell voltage and current integration for CEDV fuel gauging |
| SMBus Frequency | 10 kHz to 100 kHz - compatible with standard SMBus 1.1 hosts; supports packet error checking (PEC) |
| Data Retention | 10 years in flash memory - stores lifetime diagnostics (cycle count, max/min temp/voltage, safety events) |
| Protection Response | Dual-level (primary + secondary) - primary triggers CHG/DSG FET control; secondary asserts SAFE pin for irreversible fuse activation |
| Current Reporting Range | Up to ±320 A - scaled via SpecificationInfo() command to match sense resistor and pack configuration |
Pinout & Package
TSSOP-30 package (7.80 mm × 6.40 mm), thermally enhanced with exposed pad (not electrically connected), rated for 81.4°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | Open-drain LCD common | Drives shared cathode/anode for multiplexed LCD segments; leave unconnected if unused |
| ALERT | AFE interrupt input | Active-low signal from BQ769x0 indicating protection event (e.g., cell OVP); initiates immediate BQ78350DBT-R1A response |
| SDA / SCL | AFE communication bus | Dedicated I²C-like interface to BQ769x0 AFE; requires 10-kΩ pull-ups to VCC for reliable register read/write |
| PRECHG | Precharge FET control | Configurable polarity output (default active-low) enabling precharge path before main CHG FET activation |
| SAFE | Secondary safety output | Active-high signal for blowing external fuse during critical faults (e.g., safety overvoltage, FET failure) |
| SMBD / SMBC | SMBus host interface | Open-drain bidirectional data/clock pins; support SMBus 1.1 with PEC; require external pull-ups |
| SMBA | Slave address select | Analog input setting SMBus address via resistor divider; enables up to eight unique addresses on same bus |
| LED1–LED5 | Display segment drivers | Open-drain outputs supporting 5-segment LED or LCD; firmware-configurable for SoC indication |
| VEN | Voltage translation enable | Controls external BAT voltage divider; reduces quiescent current by disabling translation when not sampling |
| PWRM | Power mode indicator | Open-drain output signaling NORMAL/SLEEP/SHUTDOWN mode to external supervisory circuits |
Key Features
| Feature | Design Value |
|---|---|
| CEDV Fuel Gauging | Compensates discharge voltage for temperature, SoC, and self-discharge - delivers accurate remaining capacity without full discharge calibration |
| Dual-Level Protection | Primary level controls CHG/DSG FETs; secondary level asserts SAFE pin for permanent shutdown - meets functional safety requirements in LEVs |
| Lifetime Data Logging | Non-volatile storage of 12+ safety events, cycle count, min/max cell voltage/temp - supports warranty analysis and field failure root cause |
| SHA-1 Authentication | Enables host verification of genuine TI battery packs - prevents counterfeit cells and unauthorized firmware updates |
| Flexible Display Interface | Drives 5-segment LED or LCD via LED1–LED5 pins - provides real-time SoC feedback without external microcontroller |
Applications
| Light Electric Vehicles (LEVs) | Power Tools |
|---|---|
Use Scenario: Integrated into 10S–13S e-bike battery packs with 10–20 Ah capacity and 30–50 A continuous discharge. IC Role / Device Role / Timing Role: BQ78350DBT-R1A serves as central BMS controller, executing CEDV gauging every 1 s and coordinating protection actions with BQ76930 AFE. Use Value: Enables precise range estimation and automatic cell balancing, extending usable pack life by >15% under partial-state cycling. | Use Scenario: Used in cordless drill/driver battery packs (e.g., 10S Li-ion, 5 Ah, 20 A peak) requiring robust overcurrent and temperature protection. IC Role / Device Role / Timing Role: Monitors charge/discharge current via SRP/SRN signals from BQ76930, triggers DSG FET disable within <10 ms on short-circuit detection. Use Value: Prevents thermal runaway during stall conditions by enforcing discharge overcurrent limits at 320 A with <50 µs latency. |
| UPS Systems | Robot Vacuums |
Use Scenario: Deployed in 12S LiFePO₄ backup systems (20–40 Ah) for telecom base stations requiring >10-year data retention and low standby current. IC Role / Device Role / Timing Role: Enters SHUTDOWN mode (<1 µA) during long-term storage; wakes on SMBus activity or PRES assertion to resume monitoring. Use Value: Achieves <0.5% annual self-discharge loss through accurate SoH tracking and lifetime min/max voltage logging. | Use Scenario: Embedded in compact 4S–6S robot vacuum batteries (2–4 Ah) needing space-constrained design and LED-based SoC feedback. IC Role / Device Role / Timing Role: Drives 5-segment LED display via LED1–LED5 pins; updates SoC every second using internal 32.768 kHz oscillator. Use Value: Eliminates need for external display driver IC, reducing BOM cost by $0.35 and PCB area by 12 mm². |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ78350-R1A | Same die, TSSOP-30 package - identical electrical specs and firmware compatibility | No difference; BQ78350DBT-R1A is the orderable TSSOP-30 variant of BQ78350-R1A | Select BQ78350DBT-R1A for surface-mount assembly; use BQ78350-R1A only if referencing generic part number in documentation |
| BQ76940 + BQ78350-R1A | BQ76940 supports 9–15S configurations; BQ78350-R1A remains identical controller - requires updated AFE firmware and layout changes | Enables higher-cell-count packs (e.g., 14S EV battery modules) beyond BQ76920/BQ76930 limits | Choose this combination only when scaling from 10S to 14S Li-ion; verify AFE register mapping and thermal derating |
Compared with BQ78350-R1A and BQ76940+BQ78350-R1A, the BQ78350DBT-R1A offers identical functionality in the production-ready TSSOP-30 package, eliminating package conversion risk while maintaining full compatibility with BQSTUDIO configuration tools and existing firmware images.
Availability
BQ78350DBT-R1A is available at Aetrix Electronics and suitable for light electric vehicles, cordless power tools, and uninterruptible power supply systems requiring stable component supply, long-term lifecycle support, and TI-qualified battery safety compliance.
Supply support for BQ78350DBT-R1A 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 battery management IP and automotive-grade qualification expertise.
The BQ78350DBT-R1A belongs to TI's BQ78350 family of gas gauge and BMS controllers designed specifically for high-reliability, multi-cell lithium-based battery packs in portable and industrial energy storage applications.
FAQ
What is the function of the VEN pin on the BQ78350DBT-R1A?
The VEN pin on the BQ78350DBT-R1A is an open-drain output that enables or disables the external voltage translation circuit connected to the BAT pin. When asserted high (via external pull-up), it activates the divider network to measure pack voltage; when low, it disconnects the network to reduce quiescent current. This feature directly contributes to the BQ78350DBT-R1A's ultra-low 300 µA SLEEP mode current and <1 µA SHUTDOWN current.
Does the BQ78350DBT-R1A integrate its own ADC for cell voltage measurement?
No, the BQ78350DBT-R1A does not integrate a cell voltage ADC. It relies on the companion BQ769x0 AFE - which contains a 14-bit delta-sigma ADC - to digitize individual cell voltages. The BQ78350DBT-R1A reads these values via SDA/SCL and performs CEDV calculation, balancing logic, and protection decisions. Its own 16-bit ADC measures only BAT (translated pack voltage), VAUX, and internal reference - not individual cells.
How does the BQ78350DBT-R1A support SHA-1 authentication?
The BQ78350DBT-R1A implements hardware-accelerated SHA-1 hashing to authenticate battery packs against host systems. During initialization, the host sends a challenge; the BQ78350DBT-R1A computes the hash using a secret key stored in secure memory and returns the result over SMBus. This prevents unauthorized third-party battery replacements and ensures firmware integrity - a requirement in certified LEV and medical battery systems using the BQ78350DBT-R1A.
Can the BQ78350DBT-R1A operate without the BQ769x0 AFE?
No, the BQ78350DBT-R1A cannot operate standalone. It requires the BQ769x0 AFE (BQ76920, BQ76930, or BQ76940) to provide cell voltage, current (via SRP/SRN), and temperature measurements. The BQ78350DBT-R1A communicates exclusively with the AFE over dedicated SDA/SCL lines and has no independent sensing capability. All protection decisions, fuel gauging, and balancing commands depend on AFE-reported data - making the BQ769x0 an inseparable part of the BQ78350DBT-R1A system architecture.
What is the purpose of the RBI pin on the BQ78350DBT-R1A?
The RBI pin on the BQ78350DBT-R1A is a RAM backup input that preserves volatile register contents during brief VCC interruptions. When VCC drops below the power-on reset threshold (1.7–1.9 V), the device switches to RBI-supplied power (≥1.7 V) to retain RAM data - preventing loss of runtime parameters, counters, and temporary states. A capacitor (typically 10 µF) is connected between RBI and VSS to sustain this backup for up to 100 ms, ensuring seamless recovery after brownout events in the BQ78350DBT-R1A's operational environment.
BQ78350DBT-R1A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 3 ~ 15
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage
- Interface:
- SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-TSSOP
BQ78350DBT-R1A FAQ
1.How can I place an order for BQ78350DBT-R1A through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ78350DBT-R1A 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 BQ78350DBT-R1A reliable?
The price and inventory of BQ78350DBT-R1A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ78350DBT-R1A is usually 5 days.
3.What payment methods are accepted for BQ78350DBT-R1A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ78350DBT-R1A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ78350DBT-R1A?
BQ78350DBT-R1A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ78350DBT-R1A 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 BQ78350DBT-R1A?
For technical support, including BQ78350DBT-R1A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ78350DBT-R1A requirements.
6.How does Aetrix verify that BQ78350DBT-R1A is sourced from the original manufacturer or authorized distributors?
All BQ78350DBT-R1A 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 BQ78350DBT-R1A meets industry standards.
7.What is the process for return or replacement of BQ78350DBT-R1A?
All BQ78350DBT-R1A units undergo pre-shipment inspection (PSI). If there is an issue with BQ78350DBT-R1A, 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 BQ78350DBT-R1A part is unused and in its original packaging.
Return procedure for BQ78350DBT-R1A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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