Power Reference Design for a Wearable Device with Wireless Charging using the bq51003 and bq25120


Design files


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
Output voltage options PMP11311.1 PMP11311.2 PMP11311.3 PMP11311.4 PMP11311.5
Vin (Min) (V) 3.4 3.4 3.4 3.4 3.4
Vin (Max) (V) 20 20 20 20 20
Vout (Nom) (V) 4.2 1.8 1.8 5 12
Iout (Max) (A) .3 .3 .3 .3 .1
Output Power (W) 1.26 .54 .54 1.5 1.2
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC DC DC DC
Topology Linear Regulator Buck- Synchronous Buck- Synchronous Boost- Synchronous Boost- Synchronous
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLUA748A.PDF (6649 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRJ51.PDF (567 K)

Detailed schematic diagram for design layout and components

TIDRJ52.PDF (114 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRJ53.ZIP (8502 K)

Files used for 3D models or 2D drawings of IC components


Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ25120A300-mA linear battery charger with Power Path, integrated LDO and buck converter 1.8V default output

Data sheet: PDF | HTML
Battery charger ICs

BQ51003BQ51003 Wireless power Receiver

Data sheet: PDF | HTML
Boost converters (integrated switch)

TPS6104628-V Output Voltage Boost Converter in WCSP Package

Data sheet: PDF | HTML
Boost converters (integrated switch)

TPS612402.3-V to 5.5-V input range, 3.5-MHz fixed frequency 450-mA boost converter

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS627432V-5.5V input, ultra-low-power 300mA to 400mA step-down buck DCDC converter with 360nA Iq

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Test report Power Management Reference Design for a Wearable Device with Wireless Charging (Rev. A) PDF | HTML Apr. 14, 2016
More literature Adapting Qi-compliant wireless-power solutions to low-power wearable products Jun. 06, 2014
Analog Design Journal Accurately measuring efficiency of ultralow-IQ devices Jan. 22, 2014
Analog Design Journal High-efficiency, low-ripple DCS-Control offers seamless PWM/pwr-save transitions Jul. 25, 2013

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