TIDUEO0C July   2019  – March 2021

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS63900: 1.8V-5.5 VIN Buck-Boost Converter With 75-nA Ultra-low Quiescent Current and 400-mA Output Current
      2. 2.3.2 TPS610995: 0.7 VIN Synchronous Boost Converter With 400-nA Ultra-low Quiescent Current and 1-A Peak Current
      3. 2.3.3 TPS62840: 750-mA Synchronous Step-Down Converter With Ultra-low Quiescent Current Consumption
    4. 2.4 System Design Theory
      1. 2.4.1 Battery Gauge BQ35100
      2. 2.4.2 In-System Current Monitoring
        1. 2.4.2.1 Resistor Values Calculation for the two Current Ranges
        2. 2.4.2.2 LPV521 Gain Calculation
        3. 2.4.2.3 Current Ranges Simulation With TINA-TI
        4. 2.4.2.4 Key ADS7142 Register Settings in TIDA-01546 Firmware
          1. 2.4.2.4.1 ADS7142 Sampling Rate
      3. 2.4.3 NB-IoT Module From u-blox
      4. 2.4.4 NB-IoT Module From Quectel
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware
      1. 3.1.1 Testing TIDA-010053
      2. 3.1.2 TPS62840 Subsystem
      3. 3.1.3 TPS610995 Subsystem
      4. 3.1.4 Software
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
      2. 3.2.2 Test Results
        1. 3.2.2.1 Test Results With the TPS62840 Buck Converter
        2. 3.2.2.2 Test Results With the TPS610995 Boost Converter
        3. 3.2.2.3 Test Results With the TPS63900 Buck-Boost Converter NB
        4. 3.2.2.4 Summary
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
    1. 6.1 Trademarks
  12. 7Terminology
  13. 8About the Author
  14. 9Revision History

3.1.3 TPS610995 Subsystem

Bench tests were run to measure the transient load response with the TPS610995 with fixed VOUT = 3.6 V on TIDA-10053. For this, the following test conditions apply:

  • VIN = 1.8 – 3.2 V
  • Fixed VOUT = 3.6 V; Io_max = 500 mA

The following efficiency table shows the results for IOUT = 250 mA with VIN = 2.5 V, which is the average value for LiMnO2 cells over their lifetime.

VIN = 2.5 V VOUT = 3.6 V EFFICIENCY (%) at 250 mA
393.7 mA 251 mA 91.81

Figure 3-2 shows the full efficiency plot over the load current Iout.

GUID-92B7EFF0-75CD-4B6F-9BAB-B5C025EE7454-low.gif Figure 3-2 Efficiency Plot vs Load Current

Figure 3-3 shows a load transient plot for IOUT from 50 mA to 200 mA.

GUID-055A7009-DB34-4142-9685-FF3AF2612740-low.png Figure 3-3 TPS610995 Load Transient Response

Figure 3-4 shows the ripple for VOUT = 3.6 V and VIN = 3.2 V.

GUID-E2831667-C04A-4E60-B9D7-331577C67E28-low.png Figure 3-4 TPS610995 VOUT = 3.6 V With IOUT = 200 mA