My Inquiry
My Account
Texas Instruments BQ78350DBT-R1
- Part No.:
- BQ78350DBT-R1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ78350DBT-R1.pdf
- Description:
- IC BATT MGMT CTRL MULTI 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,885
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ78350DBT-R1 from Texas Instruments is a Li-ion and LiFePO4 battery management controller, serving as the companion to bq769x0 analog front-end (AFE) devices. It delivers CEDV-based fuel gauging, SMBus 1.1 host communication, configurable protection (voltage/current/temperature), lifetime data logging, and SHA-1 authentication - deployed in e-bikes, power tools, and UPS systems.
For engineers reviewing the BQ78350DBT-R1 datasheet, BQ78350DBT-R1 pinout, BQ78350DBT-R1 application, or BQ78350DBT-R1 equivalent, key selection considerations include its 30-pin TSSOP package, dual-oscillator architecture (4.194 MHz + 32.768 kHz), 16-bit ADC with 13–14-bit effective resolution, SMBus slave address programmability via SMBA, and integration with external AFE for cell voltage/current/temperature monitoring.
Technical Context
The BQ78350DBT-R1 operates as a system-level BMS controller-not a standalone monitor-relying on digital register reads from companion bq76920/bq76930/bq76940 AFEs for cell voltages, current (via SRP/SRN delta-sigma coulomb counter), and thermistor data. Its internal CoolRISC CPU executes CEDV fuel-gauge algorithms and manages protection logic across up to 15-series cells.
It implements three power modes (NORMAL, SLEEP, SHUTDOWN) with sub-1 µA shutdown current, uses VEN-controlled BAT translation for low-power voltage sensing, and supports optional LED/LCD display drive via five segment outputs (LED1–LED5) with 3 mA sink capability. Authentication and data integrity are enforced via SHA-1 and SMBus PEC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SMBus Interface | SMBus 1.1 slave only, with optional PEC; supports up to 100 kHz clock; slave address set by SMBA pin voltage |
| ADC Resolution | 16-bit no-missing-codes, 13–14-bit effective resolution for BAT/VAUX inputs; 16 ms conversion time |
| Oscillators | 4.194 MHz high-frequency oscillator (±3% error) + 32.768 kHz low-frequency oscillator (±2.5% error) |
| Supply Current | 650 µA typical in operating mode; 300 µA in SLEEP; 0.1–1 µA in SHUTDOWN |
| Operating Temp | –40°C to +85°C ambient; qualified per JEDEC JEP155 (2000 V HBM) and JEP157 (500 V CDM) |
| Data Retention | 10-year flash memory retention; 20,000 write cycles; RAM backup via RBI pin with capacitor hold-up |
| Protection Coverage | Configurable primary (cell OV/UV, charge/discharge OC, OT/UT) and secondary (safety OV/UV/OC/OT, FET fault, imbalance) protections |
Pinout & Package
Package: 30-pin TSSOP (DBT), 7.80 mm × 6.40 mm body size, 0.5 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | LCD common output | Open-drain output for LCD multiplexing; leave unconnected if unused |
| ALERT | AFE interrupt input | Active-low signal from bq769x0 indicating protection event or status change |
| SDA / SCL | AFE interface I/O | Bi-directional SMBus-compatible lines to communicate with companion AFE; require 10-kΩ pull-ups to VCC |
| PRECHG | Precharge FET control | Programmable-polarity output (default active-low) to enable precharge path; open-drain when active-low |
| VAUX / BAT | Analog voltage inputs | VAUX: auxiliary voltage sense; BAT: translated pack voltage input for fuel gauge; both use 16-bit ADC |
| SMBD / SMBC | SMBus interface | Open-drain bidirectional data/clock pins for host communication; support 10–100 kHz operation |
| SAFE | Secondary safety output | Active-high signal to trigger permanent disable (e.g., fuse blow) upon critical faults like safety OV/OC/OT |
| LED1–LED5 | Display segment drivers | Five open-drain outputs supporting 3 mA sink each; configurable for 5-segment LED or LCD display |
| VCC / VSS | Power supply | VCC: 2.4–2.6 V nominal supply; VSS: ground reference (three dedicated pins for low-impedance return) |
| MRST | Master reset input | Active-low asynchronous reset; must be held high for normal operation |
Key Features
| Feature | Design Value |
|---|---|
| CEDV Fuel Gauging | Compensates discharge voltage for temperature, SoC, and self-discharge to deliver accurate remaining capacity estimation without full discharge calibration |
| AFE-Coupled Protection | Enables full voltage/current/temperature protection stack using external bq769x0 AFE registers - decouples sensing from control for scalability across 3–15 series cells |
| Lifetime Data Logging | Non-volatile storage of 12+ diagnostic metrics including cycle count, min/max cell voltage/temperature, safety events, and peak currents - accessible via SMBus |
| SHA-1 Authentication | Host-side cryptographic verification of device identity and firmware integrity prevents unauthorized battery pack replacement or firmware tampering |
| Configurable Display Drive | Direct 5-segment LED or LCD control via LED1–LED5 outputs eliminates need for external display controller in cost-sensitive portable applications |
Applications
| e-Bikes & Pedelecs | Power Tools |
|---|---|
|
Use Scenario: Integrated BMS in 36–48 V, 10–20 Ah lithium packs powering mid-drive or hub-motor e-bikes with pedal-assist and throttle control. IC Role / Device Role / Timing Role: Central BMS controller coordinating with bq76930 AFE to manage cell balancing, CEDV state-of-charge reporting, and dual-level overcurrent protection during regenerative braking and acceleration surges. Use Value: Enables precise range estimation and thermal-aware charge termination while supporting field-upgradable firmware for evolving safety standards. |
Use Scenario: High-current 18–24 V battery packs (up to 320 Ah rated) for cordless drills, impact drivers, and string trimmers requiring robust short-circuit response and runtime prediction. IC Role / Device Role / Timing Role: Real-time coulomb counting and temperature-compensated voltage monitoring via AFE interface; triggers SAFE output within 100 µs for irreversible fuse activation during catastrophic overcurrent. Use Value: Delivers >98% SoC accuracy across 500+ cycles and extends tool runtime through optimized CC-CV charging with precharge and charge suspend at low temperatures. |
| UPS & Telecom Backup | Robot Vacuums |
|
Use Scenario: Stationary 48 V LiFePO4 backup systems for telecom base stations and edge computing nodes requiring >10-year data retention and fail-safe shutdown. IC Role / Device Role / Timing Role: Lifetime logging of min/max cell voltage, temperature excursions, and safety events; uses 32.768 kHz oscillator for accurate timestamping of all logged entries. Use Value: Provides auditable warranty evidence and predictive maintenance insight without external microcontroller or cloud dependency. |
Use Scenario: Compact 14.8 V, 5–7 Ah battery modules in autonomous robot vacuums needing low-quiescent-power operation and visual SoC feedback. IC Role / Device Role / Timing Role: Drives 5-segment LED display directly via LED1–LED5; enters SLEEP mode between cleaning cycles to maintain <300 µA average current draw. Use Value: Eliminates display driver IC, reduces BOM cost by $0.15/unit, and enables battery-level SoC indication without host MCU involvement. |
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-R1 | Requires external bq769x0 AFE; 30-pin TSSOP; SMBus-only interface; integrated CEDV algorithm | Targeted for designs where AFE/controller separation enables flexible cell count scaling (3–15S) and layout optimization | Select when system requires field-upgradable firmware, SHA-1 security, and lifetime data logging without host MCU overhead |
| BQ76940 | Integrated AFE + basic controller in single 48-pin TQFP; includes built-in cell balancing FETs; no CEDV or SHA-1 | Suitable for fixed-cell-count (9–15S) applications where space constraints favor monolithic solution over two-chip architecture | Choose when minimizing board area and component count outweighs need for advanced gauging, authentication, or long-term diagnostics |
Compared with BQ78350DBT-R1, the BQ76940 integrates sensing and control but sacrifices CEDV accuracy, secure authentication, and non-volatile lifetime logging - making it appropriate for cost-optimized, lower-complexity packs where host MCU handles higher-layer BMS functions.
Availability
BQ78350DBT-R1 is available at Aetrix Electronics and suitable for e-bike battery packs, cordless power tools, and telecom UPS systems requiring stable component supply, long-lifecycle support, and automotive-grade reliability under extended temperature operation.
Supply support for BQ78350DBT-R1 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 development.
The BQ78350DBT-R1 belongs to TI's bq™ Battery Management portfolio, designed specifically for high-accuracy, secure, and scalable lithium-based BMS implementations in portable and industrial energy storage systems.
FAQ
What is the role of the BQ78350DBT-R1 in a battery management system?
The BQ78350DBT-R1 serves as the intelligent controller in a two-chip BMS architecture, paired exclusively with bq769x0 AFEs. It executes CEDV fuel gauging, interprets AFE-collected cell voltage/current/temperature data, enforces configurable protection thresholds, logs lifetime diagnostics, and communicates results via SMBus - while offloading precision analog sensing to the AFE.
Does the BQ78350DBT-R1 include integrated cell balancing circuitry?
No, the BQ78350DBT-R1 does not contain integrated balancing FETs or drivers. It computes cell imbalance conditions and signals balancing commands to external circuitry or relies on the companion bq769x0 AFE (e.g., bq76940) which provides passive cell balancing control. Balancing execution is handled outside the BQ78350DBT-R1 die.
How does the BQ78350DBT-R1 achieve accurate state-of-charge estimation?
The BQ78350DBT-R1 uses Compensated End-of-Discharge Voltage (CEDV) technology - a model-based algorithm that dynamically adjusts voltage thresholds for remaining capacity based on real-time temperature, load current, and battery aging. It combines this with coulomb counting from the bq769x0 AFE's integrating ADC and self-discharge compensation to maintain >98% SoC accuracy over 500+ cycles.
Can the BQ78350DBT-R1 operate without an external AFE?
No - the BQ78350DBT-R1 is architecturally dependent on a bq769x0-series AFE (bq76920, bq76930, or bq76940). It lacks native ADCs for direct cell voltage measurement or high-precision current sensing. All cell-level analog data is acquired by the AFE and transferred digitally to the BQ78350DBT-R1 via SDA/SCL interface for processing and decision-making.
What are the SMBus addressing options for the BQ78350DBT-R1?
The BQ78350DBT-R1 supports eight unique SMBus slave addresses via resistor-divider configuration on SMBA (Pin 30). The device samples SMBA voltage at power-on reset or system-present detection to select one of eight predefined addresses (0x0B–0x12), enabling multiple BQ78350DBT-R1 devices on the same bus without address conflict.
BQ78350DBT-R1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- 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-R1 FAQ
1.How can I place an order for BQ78350DBT-R1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ78350DBT-R1 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-R1 reliable?
The price and inventory of BQ78350DBT-R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ78350DBT-R1 is usually 5 days.
3.What payment methods are accepted for BQ78350DBT-R1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ78350DBT-R1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ78350DBT-R1?
BQ78350DBT-R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ78350DBT-R1 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-R1?
For technical support, including BQ78350DBT-R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ78350DBT-R1 requirements.
6.How does Aetrix verify that BQ78350DBT-R1 is sourced from the original manufacturer or authorized distributors?
All BQ78350DBT-R1 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-R1 meets industry standards.
7.What is the process for return or replacement of BQ78350DBT-R1?
All BQ78350DBT-R1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ78350DBT-R1, 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-R1 part is unused and in its original packaging.
Return procedure for BQ78350DBT-R1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ78350DBT-R1 Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
