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
Parts Include:
BQ25120 700nA Low Iq Highly Integrated Battery Charge Management Solution for Wearables and IoT
BQ25120A 700nA Low Iq Highly Integrated Battery Charge Management Solution
BQ51003 BQ51003 Wireless Power Receiver
TPS61046 28-V Output Voltage Boost Converter in WCSP Package
TPS61240 5V, 400mA, 4MHz Step-Up DC/DC Converter
TPS62743 Ultra-low-power DCDC converter in WCSP
Learn more by downloading the reference design below
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