TIDUF92 December   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Wired System Description
    2. 1.2 Wireless System Description
    3. 1.3 Power Supply Options
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 BQ79718B-Q1
      2. 2.3.2 TPS3436-Q1
      3. 2.3.3 TPS715-Q1
      4. 2.3.4 TPD6E004
      5. 2.3.5 CC2662R-Q1
      6. 2.3.6 TXU0204-Q1
      7. 2.3.7 ISO7741-Q1
      8. 2.3.8 ESD2CAN24-Q1
      9. 2.3.9 LM5168-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
      1. 3.2.1 Hardware Setup
      2. 3.2.2 Software Setup
    3. 3.3 Test Results
  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

1.3 Power Supply Options

For the wireless part, the CC2662-Q1 power supply uses an LDO that delivers a 3.3Voutput. The LDO input uses either LDOIN or AVDD, both supplied from BQ79718B-Q1.

For BQ79718B-Q1 power, both LDO and DCDC designs support different usage requirements. The LDO setup integrates within BQ79718B-Q1 and requires only a transistor. The LDO advantage includes lower cost through simple design and fewer components needed.

The DCDC offers higher efficiency and lower quiescent current. When customers require lower current consumption, the DCDC design works with LM5168-Q1. This component outputs power to LDOIN for BQ79718B-Q1.

Besides LDOIN, the device provides other voltage outputs for different modes as shown in Table 1-2.

Table 1-2 BQ79718B-Q1 Power In Different Mode
POWER NAMEACTIVESLEEPSHUTDOWN
LDOIN6V6V6V
AVDD5V5V5V(If EN)1
DVDD1.5V1.5V0V
TSREF4V(If EN)14V(Configurable)0V
REF_CAP4V4V4V(If AVDD EN)1
(1) Enabled (EN)

For more details as to the normal operating voltage for each of the voltage references, see the BQ79718B-Q1 data sheet.