My Inquiry
My Account
Texas Instruments BQ78350DBTR
- Part No.:
- BQ78350DBTR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ78350DBTR.pdf
- Description:
- IC BATT MON MULTI 3-15C 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:485
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ78350DBTR from Texas Instruments is a Li-ion and LiFePO₄ battery management controller designed as a companion to the bq769x0 family of analog front-end (AFE) protection ICs. It delivers CEDV-based fuel gauging, 16-bit ADC voltage/current/temperature acquisition, SMBus 1.1 host interface, programmable safety protections, and LED/LCD display control for 3–15-series battery packs up to 320 Ahr - deployed in e-bikes, power tools, and telecom backup systems.
For engineers reviewing the BQ78350DBTR datasheet, BQ78350DBTR pinout, BQ78350DBTR application, or BQ78350DBTR equivalent, key selection criteria include its 30-pin TSSOP package, dual-oscillator architecture (4.194 MHz + 32.768 kHz), 14–15 bit effective ADC resolution, 0.1–1 µA shutdown current, and integrated SHA-1 authentication for secure battery pack identification.
Technical Context
The BQ78350DBTR operates as a system-level BMS controller that offloads fuel gauging, SoH estimation, lifetime data logging, and protection logic from the bq769x0 AFE. It reads raw cell voltage, current (via SRP/SRN), and thermistor data from the AFE over dedicated SDA/SCL lines, then applies CEDV modeling with temperature- and SoC-compensated self-discharge correction.
Its dual-clock architecture enables precise timing: the 4.194 MHz high-frequency oscillator drives CPU and ADC operations, while the 32.768 kHz low-frequency oscillator supports real-time clock functions and low-power sleep mode wake-up. All protection decisions (voltage, current, temperature, imbalance) are executed in firmware with configurable thresholds and response actions including SAFE pin assertion and FET control signals (PRECHG, DSG).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4 V to 2.6 V - tight regulation required; exceeds 2.75 V risks permanent damage |
| Operating Temperature | –40°C to +85°C - validated for industrial and outdoor portable applications |
| ADC Resolution | 16-bit no-missing-codes, 14–15-bit effective - enables sub-mV cell voltage accuracy and µV-level offset stability |
| Shutdown Current | 0.1–1 µA - supports multi-year battery pack shelf life without significant self-discharge |
| SMBus Interface | SMBus 1.1 slave only, 10–100 kHz - supports PEC error checking and up to eight configurable slave addresses |
| Oscillators | 4.194 MHz ±3% HFO + 32.768 kHz ±2.5% LFO - provides independent timing domains for computation and RTC |
| Data Retention | 10 years in flash memory - stores cycle count, min/max voltage/temperature, safety events for warranty analysis |
Pinout & Package
Package: 30-pin TSSOP (DBT), 7.80 mm × 6.40 mm, 0.65 mm pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | LCD common driver output | Open-drain sink for multiplexed LCD segment control; requires external pull-up |
| ALERT | AFE interrupt signal | Active-low bidirectional line signaling fault conditions from bq769x0 to BQ78350DBTR |
| SDA / SCL | AFE serial interface | Dedicated I²C-like bus to bq769x0 AFE; 10-kΩ pull-ups to VCC required |
| PRECHG | Precharge FET gate driver | Configurable polarity open-drain output; internal 2.5 V pull-up when active-high |
| SAFE | Secondary safety enforcement | Active-high output to trigger fuse blow or hard disconnect on critical faults |
| SMBD / SMBC | SMBus host interface | Open-drain bidirectional data/clock; compliant with SMBus 1.1 timing specs |
| LED1–LED5 | Display segment drivers | Current-sink outputs supporting 5-segment LED or LCD; 3 mA max per pin |
| GPIOA / GPIOB | Configurable I/O | Programmable input/output pins; must be tied to VSS if unused |
| VCC / VSS | Power supply | Single 2.5 V nominal supply; three VSS pins provide low-impedance ground 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 - delivers <2% SoC error across 0–100% range in real-world cycling |
| Programmable Protections | Independent thresholds for over/under-voltage, over/under-temperature (charge/discharge), short circuit, and cell imbalance - configurable via SMBus registers |
| Lifetime Data Logging | Non-volatile storage of 12+ safety events, cycle count, lifetime min/max cell voltages, and thermal extremes - accessible via SMBus for field failure analysis |
| SHA-1 Authentication | Host-verifiable cryptographic signature prevents unauthorized battery pack replacement or cloning |
| Low-Power Operation | SHUTDOWN mode draws ≤1 µA; SLEEP mode configurable for extended shelf life without compromising protection responsiveness |
Applications
| Electric Power Tools | Light Electric Vehicles (LEVs) |
|---|---|
Use Scenario: Cordless drill/driver battery packs requiring accurate runtime prediction and cell-level protection during high-current bursts (up to 320 A). IC Role / Device Role / Timing Role: BQ78350DBTR acts as the primary fuel gauge and protection coordinator, interfacing with bq76930 AFE to monitor 10-series Li-ion cells and enforce charge/discharge limits. Use Value: Enables precise state-of-charge reporting under dynamic load, extends tool runtime via optimized CEDV modeling, and prevents thermal runaway through dual-stage temperature monitoring. | Use Scenario: E-bike battery packs with 13-series LiFePO₄ cells needing robust safety enforcement and LED-based SoC indication for rider feedback. IC Role / Device Role / Timing Role: BQ78350DBTR serves as the central BMS controller, driving 5-segment LED display and asserting SAFE pin to cut power during overtemperature events detected by NTC thermistors. Use Value: Provides real-time SoC visualization, logs lifetime thermal stress for warranty validation, and triggers irreversible disconnect on critical faults - meeting EN 15194 e-bike compliance requirements. |
| Telecom Backup Systems | Uninterruptible Power Supplies (UPS) |
Use Scenario: 48 V Li-ion backup batteries for wireless base stations requiring long-term reliability, data integrity, and remote diagnostics over SMBus. IC Role / Device Role / Timing Role: BQ78350DBTR manages cell balancing, records min/max voltage/temperature history, and reports health metrics to network management systems via SMBus polling. Use Value: Reduces maintenance costs by predicting end-of-life via SoH tracking, ensures fail-safe operation during grid outages, and supports remote firmware updates through authenticated communication. | Use Scenario: Rack-mounted UPS units using 12-series Li-ion cells where runtime accuracy, safety certification (UL 1973), and tamper resistance are mandatory. IC Role / Device Role / Timing Role: BQ78350DBTR executes CC-CV charging control, enforces dual-level overvoltage/overcurrent protection, and performs SHA-1 authentication to validate genuine battery modules. Use Value: Guarantees consistent backup runtime under variable loads, prevents unsafe charging conditions, and blocks counterfeit battery insertion - critical for data center uptime SLAs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76940 | Integrated AFE + MCU in single chip; no companion controller needed; supports up to 15-series but lacks CEDV gauging and LED drivers | Used in space-constrained designs where separation of AFE and controller is undesirable; targets cost-sensitive consumer tools | Select BQ76940 when board area is limited and advanced fuel gauging is not required; BQ78350DBTR remains preferred for precision SoC and display integration |
| BQ78350-R1 | Same die, different firmware revision; supports newer bq76952 AFE; adds enhanced SHA-256 option and improved low-temp CEDV calibration | Targeted at next-gen LEVs and medical devices requiring updated security and wider temperature operation | BQ78350-R1 offers backward-compatible pinout and register map but requires updated firmware stack; BQ78350DBTR suits legacy designs with bq76920/30/40 AFEs |
Compared with BQ76940, BQ78350DBTR delivers superior fuel gauging accuracy and display flexibility at the cost of higher component count; compared with BQ78350-R1, it provides proven stability for existing production systems but lacks newer cryptographic and calibration enhancements.
Availability
BQ78350DBTR is available at Aetrix Electronics and suitable for electric power tools, light electric vehicles, and telecom backup systems requiring stable component supply throughout extended product lifecycles.
Supply support for BQ78350DBTR 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.
The BQ78350DBTR belongs to TI's bq™ Battery Management portfolio, engineered specifically for high-accuracy fuel gauging and safety-critical protection in multi-cell Li-ion and LiFePO₄ battery packs used in mobility and infrastructure applications.
FAQ
What is the primary function of the BQ78350DBTR in a battery management system?
The BQ78350DBTR serves as a dedicated battery management controller that performs fuel gauging using Compensated End-of-Discharge Voltage (CEDV) technology, executes voltage/current/temperature-based protection logic, manages cell balancing, logs lifetime diagnostic data, and interfaces with host systems via SMBus 1.1. It operates exclusively as a companion to bq769x0 AFE devices and does not integrate sensing circuitry itself - all analog measurements are performed by the AFE and relayed to the BQ78350DBTR for processing.
Does the BQ78350DBTR support standalone operation without an external AFE?
No, the BQ78350DBTR does not support standalone operation. It requires connection to a compatible bq769x0 AFE (e.g., bq76920, bq76930, or bq76940) to acquire cell voltage, current, and temperature measurements. The BQ78350DBTR communicates with the AFE over dedicated SDA/SCL lines and relies entirely on the AFE for analog-to-digital conversion and hardware-level protection triggering. Its role is computational, algorithmic, and interface-oriented - not sensing or direct FET control.
What display options does the BQ78350DBTR support, and how are they configured?
The BQ78350DBTR supports both 5-segment LED and multiplexed LCD displays via dedicated LED1–LED5 and COM pins. LED mode uses current-sink outputs capable of driving up to 3 mA per segment; LCD mode requires external bias and uses COM as a common electrode. Configuration is firmware-selectable - no hardware changes are needed. The DISP pin enables push-button wake-up for display activation, and VAUX provides auxiliary voltage measurement for display power monitoring. Display content (e.g., SoC percentage, fault codes) is generated internally and mapped to segments via register settings.
How does the BQ78350DBTR implement security and authentication?
The BQ78350DBTR implements SHA-1 authentication to verify the identity of the host system before granting access to sensitive battery data or configuration registers. During initialization, the host sends a challenge; the BQ78350DBTR computes a response using a secret key stored in protected memory and returns it over SMBus. This prevents unauthorized firmware updates, counterfeit battery insertion, or tampering with protection thresholds. While SHA-1 is deprecated for new designs, it remains functionally valid for legacy BQ78350DBTR deployments and is sufficient for pack-level authentication in industrial applications.
What are the power consumption characteristics of the BQ78350DBTR in different operating modes?
The BQ78350DBTR offers three distinct power modes: NORMAL mode draws 650 µA average current with 1-second measurement intervals; SLEEP mode reduces current to 300 µA with user-configurable update periods; SHUTDOWN mode consumes only 0.1–1 µA by disabling all circuitry except RAM retention powered via RBI pin. These modes are controlled via SMBus commands and signaled externally through the PWRM pin. The VEN pin further lowers system power by enabling/disabling the BAT voltage translation network only when needed - critical for extending shelf life in battery packs shipped in low-power states.
BQ78350DBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
BQ78350DBTR FAQ
1.How can I place an order for BQ78350DBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ78350DBTR 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 BQ78350DBTR reliable?
The price and inventory of BQ78350DBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ78350DBTR is usually 5 days.
3.What payment methods are accepted for BQ78350DBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ78350DBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ78350DBTR?
BQ78350DBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ78350DBTR 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 BQ78350DBTR?
For technical support, including BQ78350DBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ78350DBTR requirements.
6.How does Aetrix verify that BQ78350DBTR is sourced from the original manufacturer or authorized distributors?
All BQ78350DBTR 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 BQ78350DBTR meets industry standards.
7.What is the process for return or replacement of BQ78350DBTR?
All BQ78350DBTR units undergo pre-shipment inspection (PSI). If there is an issue with BQ78350DBTR, 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 BQ78350DBTR part is unused and in its original packaging.
Return procedure for BQ78350DBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ78350DBTR 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…
