SLUA748A December   2015  – April 2016 BQ25120 , BQ51003 , TPS61046 , TPS61240 , TPS62743

 

  1.   Trademarks
  2.   Power Management Reference Design for a Wearable Device with Wireless Charging Using the bq51003 and bq25120
    1. 1 Wearable Power Design
      1. 1.1 Wireless Charging Input
      2. 1.2 Battery Charger, MCU, Radio, and Sensor Power
      3. 1.3 Second Buck Output for MCU, Radio or Sensor
    2. 2 PMOLED Display Power Design
    3. 3 Heart Rate Monitor or e-Ink Power Design
    4. 4 Layout Guidelines for Wearable Design
      1. 4.1 Wireless Receiver (bq51003)
      2. 4.2 Linear Charger (bq25120)
      3. 4.3 Buck Converter (TPS62743/6)
      4. 4.4 Boost Converters (TPS61046 and TPS61240)
      5. 4.5 General Considerations
    5. 5 References
  3. AExperimental Results
    1. A.1 Experimental Results
  4.   Revision History

1 Wearable Power Design

Table 1. Wearable Power Requirements

DESCRIPTION VALUE
Input Voltage (VIN) 5 V USB input or Qi Wireless Transmitter
Input Current Up to 500 mA
Output Voltage for Li-Ion Battery 3.6 V to 4.65 V
Fast Charge Current For Li-Ion Battery 5 mA to 300 mA
Termination Current for Li-Ion Battery 500 µA to 37 mA
Output Voltage for MCU (SYS rail) 1.8 V nominal (Adjustable from 1.1 V to 3.3 V)
Output Current for MCU (SYS rail) Up to 300 mA
Output Voltage for Second Buck Rail 1.8 V
Output Current for Second Buck Rail Up to 300 mA
Output Voltage for PMOLED Display 12 V
Output Current for PMOLED Display Up to 100 mA
Output Voltage for Heart Rate Monitor 5 V
Output Current for Heart Rate Monitor Up to 300 mA
Output Voltage for Sensors or Radio (LDO) 0.8 V to 3.3 V
Output Current for Sensors or Radio (LDO) Up to 100 mA