24-V AC Power Stage With Wide Vin Converter and Battery Gauge Reference Design for Smart Thermostat

(ACTIVE) TIDA-01395

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Key Document

Description

The TIDA-01395 TI Design provides a low BOM cost, high-efficiency power stage solution for smart thermostats, and other gateway building automation end quipment. This power stage takes a 24-V AC input and produces a 5-V and 3.3-V output rail, which can power additional point-of-load converters if added. The design provides LiPo battery charging and seamless switching to battery power during a 24-V AC brownout. The power-path capability provides battery power assistance allowing system load transient to exceed the current limit of the 24-V AC to DC system, allowing a lower cost wide Vin buck to be used. The battery fuel gauge helps designers preserve battery life and ensure proper operation by helping the central processor make smarter decisions on power saving and system functionality.

Features
  • Battery fuel gauge
  • Dynamic power path/battery power assist
  • High efficiency over entire load current range
  • USB overcurrent compliant

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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
BQ24072  USB-Friendly Li-Ion Battery Charger and Power-Path Management IC, Vout 200mV above Vbat | Linear  Battery management  Sample & Buy View Design Kits & Evaluation Modules
BQ27426  Single cell System-Side Battery Fuel (Gas) Gauge w/Pre-programmed Chemistry Profile  Battery management  Sample & Buy View Design Kits & Evaluation Modules
LM2903  Dual Differential Comparator  Amplifiers  Sample & Buy Not Available
LM5166  3V-65V Input, 500mA Synchronous Buck Converter With Ultra-Low Iq  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TLV62080  1.2A High Efficient Step Down Converter in 2x2mm SON Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPD1E10B06  Single-Channel ESD in 0402 Package With 10pF Capacitance and 6V Breakdown  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules
TPD2E2U06  Dual-Channel High-Speed ESD Protection  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules
TPS27081A  1.2V - 8V, 3A PFET High Side Load Switch w/ Level Shift & Adj Slew Rate Control  Power switches  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
BQ24072 Download Download
BQ27426 Download -
LM2903 Download Download
Download Download
Download Download
Download -
Download Download
LM5166 Download Download
TLV62080 Download
TPD1E10B06 Download -
TPD2E2U06 Download
TPS27081A Download Download

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Step 2: Download the Symbol and Footprint from the CAD.bxl file table.


Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 5757 09 Mar 2017 20
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 781 07 Mar 2017 20
ZIP 978 07 Mar 2017 21
PDF 2114 07 Mar 2017 12
PDF 372 07 Mar 2017 11
PDF 76 07 Mar 2017 10
PDF 617 07 Mar 2017 52
Related Tools & Software

Reference Designs  ( 1 )

Software (1)

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


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