TIDUF26 june   2023 BQ24072 , LMR36520 , TLV62568 , TPS2116

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 24 VAC to DC Rectification
      2. 2.2.2 eFuse Protection
      3. 2.2.3 5-V Rails
        1. 2.2.3.1 LMR36520 Voltage Rail
        2. 2.2.3.2 USB Power Input
      4. 2.2.4 Power Source ORing
      5. 2.2.5 Battery Management
      6. 2.2.6 3.3-V Power Rail
      7. 2.2.7 Power Rail Current Sensing
      8. 2.2.8 Backlight LED Driver
      9. 2.2.9 BoosterPack Overview
    3. 2.3 Highlighted Products
      1. 2.3.1 LMR36520
      2. 2.3.2 TPS2116
      3. 2.3.3 TLV62568
      4. 2.3.4 INA2180
      5. 2.3.5 TPS92360
      6. 2.3.6 TPS2640
      7. 2.3.7 BQ24072
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1  24-VAC Start-Up and Shutdown
      2. 3.3.2  USB Start-Up and Shutdown
      3. 3.3.3  ORing
      4. 3.3.4  LMR36520
      5. 3.3.5  TLV62568 Transient Response
      6. 3.3.6  BM24072 Transient Response
      7. 3.3.7  TLV62568 (3V3 Power Rail)
      8. 3.3.8  LMR36520 (LMOut Power Rail)
      9. 3.3.9  BM24072 (BMOut Power Rail)
      10. 3.3.10 Reference
        1. 3.3.10.1 TLV62568
        2. 3.3.10.2 LMR36520
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

BM24072 (BMOut Power Rail)

The ripple on the BMOut power rail varies significantly between battery usage only versus a PWRin source with battery power assist. When using only the battery, the BM24072 connects the battery to the output by closing an internal FET. As a result, the noise during purely battery operation is equal or less than the noise floor of the oscilloscope used for measurement. Figure 65, Figure 66, and Figure 67 (Figure 3-47, Figure 3-48, and Figure 3-49) show an increased ripple when using a source other than the battery.

GUID-20230607-SS0I-H8NF-GKP3-7VSBCJ4VZS01-low.png Figure 3-47 “BMOut” Ripple (0 A; Battery Source Only)
GUID-20230607-SS0I-LJZF-9D25-TR97W3HPPMFF-low.png Figure 3-48 “BMOut” Ripple (1 A; Battery Source Only)
GUID-20230607-SS0I-TLQH-SNCG-WMLJR6WPXLNC-low.png Figure 3-49 “BMOut” Ripple (1 mA; Battery and USB Sources)
GUID-20230607-SS0I-HFRT-WS2R-WKM6VCNJMSLH-low.png Figure 3-50 “BMOut” Ripple (1 A; Battery and USB Sources)
GUID-20230607-SS0I-JC8J-NPP3-WXH6S2VTKW5Z-low.png Figure 3-51 “BMOut” Ripple (500 mA; Battery and USB Sources)