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TIDA-010268

5s to 7s battery pack monitor reference design with low-side MOSFET control

TIDA-010268

Design files

Overview

This reference design is a high-cell voltage-accuracy 5s to 7s lithium-ion (Li-ion), lithium iron phosphate (LiFePO4) battery pack design. The design monitors each cell voltage, pack current, cell and metal-oxide semiconductor field-effect transistor (MOSFET) temperature with high accuracy and protects the Li-ion, LiFePO4 battery pack against cell overvoltage, cell undervoltage, overtemperature, charge and discharge overcurrent and discharge short-circuit situations. The product adopts low-side N-channel MOSFET architecture and has strong driving on and off capability. These features make this reference design highly applicable for power tools and vacuum cleaner battery pack applications.

Features
  • Battery pack designed for 5s to 7s Li-Ion or LiFePO4 based 30A maximum continuous discharge current (BQ76905 and BQ76907 can support as low as 2 cells, with reasonable changes, this design can also support a minimum of 2-cell application)
  • Monitors cell voltages, pack current, pack temperatures, balances cells and protects by controlling charge or discharge FETs
  • Hardware protection for overcurrent in discharge, short circuit in discharge, overvoltage and undervoltage
  • Robust battery cell protection with secondary protection: cell overvoltage, cell undervoltage and overtemperature
  • Small footprint, low on-resistance, low Qg and Qgd MOSFETs onboard for low-side MOSFET control
  • Low quiescence current and low power state for shipment
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

PDF | HTML
TIDUF44.PDF (916 K)

Reference design overview and verified performance test data

TIDMCI3.PDF (522 K)

Detailed schematic diagram for design layout and components

TIDMCI4.PDF (158 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDMCI5.PDF (331 K)

Detailed overview of design layout for component placement

TIDMCI7.ZIP (2692 K)

Files used for 3D models or 2D drawings of IC components

TIDCGL9.ZIP (725 K)

Design file that contains information on physical board layer of design PCB

TIDMCI6.PDF (1438 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Arm Cortex-M0+ MCUs

MSPM0C110424 MHz Arm® Cortex®-M0+ MCU with 16-KB flash, 1-KB SRAM, 12-bit ADC

Data sheet: PDF | HTML
Arm Cortex-M0+ MCUs

MSPM0L110632-MHz Arm® Cortex®-M0+ MCU with 64-KB flash, 4-KB SRAM, 12-bit ADC

Data sheet: PDF | HTML
Battery monitors & balancers

BQ76905Low-power monitor and protector for 2S to 5S with high accuracy cell voltage measurement

Data sheet: PDF | HTML
Battery monitors & balancers

BQ76907Low-power monitor and protector for 2S to 7S with high accuracy cell voltage measurement

Data sheet: PDF | HTML
Battery protectors

BQ772073-series to 7-series cell Li-ion battery, internal delay timer, voltage and temperature protector

Data sheet: PDF | HTML
CAN transceivers

TCAN1042-Q1Automotive fault-protected CAN transceiver with flexible data-rate

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV704150-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
Power modules (integrated inductor)

TPSM365R63-V to 65-V input, 1-V to 13-V output, 0.6-A synchronous buck converter power module

Data sheet: PDF | HTML
Thermistors

TMP611%, 10-kΩ linear thermistor in 0402, 0603/0805 and through hole packages

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Design guide 5s–7s Battery Pack Reference Design With Low-Side MOSFET Control PDF | HTML Jan. 01, 2024

Related design resources

Software development

APPLICATION SOFTWARE & FRAMEWORK
BQSTUDIO Battery Management Studio (bqStudio) Software

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