Power Reference Design for a Wearable Device with Wireless Charging using the bq51003 and bq25120
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Wearable devices require advanced power management to achieve long battery run times with always-on functionality.  Additionally, the devices need to use small rechargeable batteries and enable small footprint designs.  This application note shows the implementation of a scalable power management solution for wearables that can be tailored for activity monitors or smart watches. The design provides a wireless charging input, highly configurable battery management solution with Li-Ion battery charger and low quiescent current (Iq) DC/DC buck, boost converter for PMOLED display, boost converter for Heart Rate Monitor (HRM), and second configurable low Iq DC/DC buck.

  • Wireless charging for ease of use
  • Configurable charger and system power management
  • Boosts for display and heart rate monitor
  • Second buck for radio or dual core MCU

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
(Output Voltage 5)
Vin (Min) (V)
Vin (Max) (V)2020202020
Vout (Nom) (V)
Iout (Max) (A).
Output Power (W)
TopologyLinear RegulatorBuck- SynchronousBuck- SynchronousBoost- SynchronousBoost- Synchronous

TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
BQ25120  700nA Low Iq Highly Integrated Battery Charge Management Solution for Wearables and IoT  Battery management ICs  Not Available Not Available
BQ25120A  300-mA linear battery charger with Power Path, integrated LDO and buck converter 1.8V default output  Battery management ICs  Sample & Buy View Design Kits & Evaluation Modules
BQ51003  BQ51003 Wireless power Receiver  Battery management ICs  Sample & Buy Not Available
TPS61046  28-V Output Voltage Boost Converter in WCSP Package  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS61240  5V, 400mA, 4MHz Step-Up DC/DC Converter  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS62743  2V-5.5V input, ultra-low-power 300mA to 400mA step-down buck DCDC converter with 360nA Iq  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
BQ25120 Download -
BQ51003 Download -
TPS61046 Download -
TPS61240 Download Download
Download -
TPS62743 Download -

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Technical documentation

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Datasheet (4)
Title Type Size (KB) Date
PDF 2204 30 Jul 2018
PDF 2531 03 Jun 2016
PDF 1417 03 May 2016
PDF 1057 15 Apr 2015
Application notes (2)
Title Type Size (KB) Date
PDF 254 22 Jan 2014
PDF 605 25 Jul 2013
User guides (1)
Title Type Size (KB) Date
PDF 6583 14 Apr 2016
Design files (3)
Title Type Size (KB) Date
ZIP 8502 04 Dec 2015
PDF 114 04 Dec 2015
PDF 567 04 Dec 2015
More literature (1)
Title Type Size (KB) Date
PDF 402 06 Jun 2014
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Software development (1)

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