Low-power options for smart meter wireless modules using primary cells reference design
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This reference design showcases three different power architectures for smart flow meters with lithium manganese dioxide (LiMnO2) primary batteries and commercial off-the-shelf narrowband modules for Internet of Things (IoT)-related applications. The three power solutions are combined with the Battery and System Health Monitoring of Battery Powered Smart Flow Meters Reference Design hardware, which provides highly-accurate State-of-Health (SOH) calculation for the battery lifetime. The always-on in-system current monitoring detects the current peak of the RF transmission and the SOH measurement is scheduled afterwards with an adjustable delay.  High-efficiency power architectures for supplying narrowband cellular modules for IoT-related applications with the BQ35100 battery gauge delivers real-time battery life data enabling on-demand battery replacement.

  • Accurate in-system battery gauging by utilizing the BQ35100 device capabilities
  • 1 μA always-on in-system current monitoring with adjustable high and low thresholds for various power profile states with ADS7142 + LPV521
  • Support for a single or two-in-series primary LiMnO2 cells
  • Enables overall efficiency comparison of boost, buck, or buck-boost approach

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD13385F5  12V, N ch NexFET MOSFET™, single LGA 0.8x1.5, 19mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
TPS61099  0.7Vin Synchronous Boost Converter with 800 nA Ultra-Low Quiescent Current  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS62840  60-nA IQ, 1.8-V to 6.5-VIN, high-efficiency 750-mA step-down converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS63802  2-A, high-efficient, 11-µA quiescent current buck-boost converter in QFN/DFN package  Buck-boost & inverting  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TPS61099 Download Download
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TPS62840 Download -
TPS63802 Download -

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2004 02 Mar 2020
Design files (6)
Title Type Size (KB) Date
PDF 563 03 Sep 2019
ZIP 243 03 Sep 2019
ZIP 1768 03 Sep 2019
PDF 58 03 Sep 2019
PDF 154 03 Sep 2019
PDF 376 03 Sep 2019
Related Tools & Software

Reference Designs  ( 1 )

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
bq35100 Lithium Primary Cell Evaluation Module Using End-of-Service Monitor Gas Gauging  BQ35100EVM-795  Evaluation Modules & Boards 

Software (1)

Name Part Number Software Type
Battery Management Studio (bqStudio) Software  BQSTUDIO  Application Software & Frameworks 

Models (1)

Title Category Type Size (KB) Date Views
TIDA-010053 Simulation TINA-TI Reference Design ZIP 12 KB 02 Jul 2019

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