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

(ACTIVE) PMP11311

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Key Document

Description

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.

Features
  • 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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Bill of Materials (BOM)

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Parametrics
 PMP11311.1
(Output Voltage 1)
PMP11311.2
(Output Voltage 2)
PMP11311.3
(Output Voltage 3)
PMP11311.4
(Output Voltage 4)
PMP11311.5
(Output Voltage 5)
Vin (Min) (V)3.43.43.43.43.4
Vin (Max) (V)2020202020
Vout (Nom) (V)4.21.81.8512
Iout (Max) (A).3.3.3.3.1
Output Power (W)1.26.54.541.51.2
Isolated/Non-IsolatedNon-IsolatedNon-IsolatedNon-IsolatedNon-IsolatedNon-Isolated
Input TypeDCDCDCDCDC
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  Not Available Not Available
BQ25120A  700nA Low Iq Highly Integrated Battery Charge Management Solution  Battery management  Sample & Buy View Design Kits & Evaluation Modules
BQ51003  BQ51003 Wireless Power Receiver   Battery management  Sample & Buy Not Available
TPS61046  28-V Output Voltage Boost Converter in WCSP Package  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS61240  5V, 400mA, 4MHz Step-Up DC/DC Converter  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS62743  Ultra-low-power 300mA to 400mA Step-Down Buck DCDC Converter with 360nA Iq in WCSP package  Step-down (buck)  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 Documents

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Datasheet (4)
Title Abstract Type Size (KB) Date Views
PDF 2210 30 Jul 2018
PDF 2436 03 Jun 2016
PDF 1324 03 May 2016
PDF 1064 15 Apr 2015
Application notes (2)
Title Abstract Type Size (KB) Date Views
PDF 254 22 Jan 2014 142
PDF 587 25 Jul 2013 96
User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 6583 14 Apr 2016 301
Design files (3)
Title Abstract Type Size (KB) Date Views
ZIP 8502 04 Dec 2015 67
PDF 114 04 Dec 2015 63
PDF 567 04 Dec 2015 133
More literature (1)
Title Abstract Type Size (KB) Date Views
PDF 402 06 Jun 2014 101
Related Tools & Software

Reference Designs  ( 1 )

Name Part Number Tool Type
Small Wireless Power Transmitter for Low Power Wearable Applications  TIDA-00334  TI Designs

Software (1)



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