BQ78350 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Similar functionality to the compared device.
BQ78350-R1A ACTIVE CEDV li-ion gas gauge and battery management controller Functionally identical to BQ7830. Pre-loaded with latest R1 firmware (v1.04). Improves the robustness of the Shutdown routine (fif using the Shutdown command in their application)
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Product details

Parameters

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Features

  • Compensated End-of-Discharge Voltage (CEDV) Gauging Algorithm
  • Supports SMBus Host Communication
  • Flexible Configuration for 3- to 5-Series (bq76920), 6- to 10-Series (bq76930),
    and 9- to 15-Series (bq76940) Li-Ion and LiFePO4 Batteries
  • Supports Battery Configurations up to 320 Ahr
  • Supports Charge and Discharge Current Reporting up to 320 A
  • External NTC Thermistor Support from Companion AFE
  • Full Array of Programmable Protection Features
    • Voltage
    • Current
    • Temperature
    • System Components
  • Lifetime Data Logging
  • Supports CC-CV Charging, Including Precharge, Charge Inhibit, and
    Charge Suspend
  • Offers an Optional Resistor Programmable SMBus Slave Address for
    up to Eight Different Bus Addresses
  • Drives up to a 5-Segment LED or LCD Display for State-Of-Charge
    Indication
  • Provides SHA-1 Authentication
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Description

The Texas Instruments bq78350 Li-Ion and LiFePO4 Battery Management Controller and companion to the bq769x0 family of Analog Front End (AFE) protection devices provides a comprehensive set of Battery Management System (BMS) subsystems, helping to accelerate product development for faster time-to-market.

The bq78350 controller and the bq769x0 AFE support from 3-series to 15-series cell applications. The bq78350 provides an accurate fuel gauge and state-of-health (SoH) monitor, as well as cell balancing and a full range of voltage-, current-, and temperature-based protection features.

The bq78350 offers optional LED or LCD display configurations for the capacity reporting. It also makes data available over its SMBus 1.1 interface. Battery history and diagnostic data is also kept within the device in non-volatile memory and is available over the same interface.

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Technical documentation

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View all 9
Type Title Date
* Data sheet bq78350 CEDV Li-Ion Gas Gauge and Battery Management Controller Companion to the bq769x0 Battery Monitoring AFE datasheet Jun. 14, 2012
User guide bq76930 and bq76940 Evaluation Module (Rev. C) Dec. 10, 2018
User guide bq76920 Evaluation Module User's Guide (Rev. D) Nov. 12, 2018
Technical article When it comes to batteries, not even the sky’s the limit Aug. 15, 2015
Technical article It’s a dirty job, but nobody’s gotta do it: Rise of the (domestic) robots Jul. 29, 2015
User guide bq78350 Technical Reference Manual (Rev. B) Jul. 22, 2015
Application note bq78350 Data Memory Programming for Mass Production Apr. 16, 2015
Application note Using the bq78350 (Rev. A) Aug. 04, 2014
Application note Using the bq78350 Jun. 25, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
149
Description

The bq76920EVM is a populated circuit board for evaluation of the bq7692000 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 3 to 5-series Lithium Ion, Lithium iron phosphate, and more battery (...)

Features
  • Populated circuit board with:
  • Bq7692000 AFE IC
  • Bq78350 Battery Management controller
  • FETs for current control
  • Test point patterns for easy evaluation
EVALUATION BOARD Download
document-generic User guide
249
Description

The bq76930EVM is a populated circuit board for evaluation of the bq76930 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 6 to 10-series Lithium Ion, Lithium iron phosphate, and more battery (...)

Features
  • Bq7693000 AFE IC
  • Bq78350 Battery Management controller
  • FETs for current control
  • Test point patterns for easy evaluation
EVALUATION BOARD Download
document-generic User guide
249
Description

The bq76940EVM is a populated circuit board for evaluation of the bq76940 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 9 to 15-series Lithium Ion, Lithium iron phosphate, and more battery (...)

Features
  • Bq7694000 AFE IC
  • Bq78350 Battery Management controller
  • FETs for current control
  • Test point patterns for easy evaluation

Software development

APPLICATION SOFTWARE & FRAMEWORK Download
Gauging Parameter Calculator for CEDV gauges
GPCCEDV Gauging Parameter Calculator (GPC) is a math calculation and simulation tool that helps the battery designer to obtain matching Compensated End of Discharge Voltage (CEDV) coefficients for the specific battery profile. The tool allows the user to increase the accuracy of the fuel gauge IC over (...)
FIRMWARE Download
BQ78350-R2 Device Firmware: CEDV Li-Ion Gas Gauge and Battery Management Controller
BQ78350-R2-DEVICE-FW The bq78350-R2 li-ion and LiFePO4 battery management controller and companion to the bq769x0 family of Analog Front End (AFE) protection devices provides a comprehensive set of Battery Management System (BMS) subsystems, helping to accelerate product development for faster time-to-market.
Features
  • Compensated End-of-Discharge Voltage (CEDV) gauging algorithm
  • Supports SMBus host communication
  • Flexible configuration for 3- to 5-Series (bq76920), 6- to 10-Series (bq76930), and 9- to 15-Series (bq76940) li-ion and LiFePO4 batteries
  • Supports battery configurations up to 320Ahr
  • Supports charge and (...)
SUPPORT SOFTWARE Download
SLUC564FW.ZIP (2777 KB)
SUPPORT SOFTWARE Download
SLUC568.ZIP (148 KB)
SUPPORT SOFTWARE Download
SLUC572A.ZIP (4206 KB)

Design tools & simulation

CALCULATION TOOL Download
document-generic User guide

Reference designs

REFERENCE DESIGNS Download
15 Cell Lithium Ion Battery Controller Analog Front End Reference Design
TIDA-00255 The TIDA00255 reference design utilizes the bq76940 analog front end (AFE) IC.  It measures cell voltages, and die temperature or external thermistor voltage using a 14 bit ADC.  Current is measured separately by a separate 16 bit coulomb counter.  The design can turn off low side (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (DBT) 30 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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