BQ25570RGRR TI Chips bq25570 nano power boost charger and buck converter for energy harvester powered applications

TI Chips BQ25570RGRR bq25570 nano power boost charger and buck converter for energy harvester powered applications

Features
• Ultra Low Power DC-DC Boost Charger
– Cold-Start Voltage: VIN ≥ 600 mV
– Continuous Energy Harvesting From VIN as
low as 100 mV
– Input Voltage Regulation Prevents Collapsing
High Impedance Input Sources
– Full Operating Quiescent Current of 488 nA
(typical)
– Ship Mode with < 5 nA From Battery
• Energy Storage
– Energy can be Stored to Re-chargeable Li-ion
Batteries, Thin-film Batteries, Supercapacitors, or Conventional Capacitors
• Battery Charging and Protection
– Internally Set Undervoltage Level
– User Programmable Overvoltage Levels
• Battery Good Output Flag
– Programmable Threshold and Hysteresis
– Warn Attached Microcontrollers of Pending
Loss of Power
– Can be Used to Enable or Disable System
Loads
• Programmable Step Down Regulated Output
(Buck)
– High Efficiency up to 93%
– Supports Peak Output Current up to 110 mA
(typical)
• Programmable Maximum Power Point Tracking
(MPPT)
– Provides Optimal Energy Extraction From a
Variety of Energy Harvesters including Solar
Panels, Thermal and Piezo Electric Generators

Applications
• Energy Harvesting
• Solar Chargers
• Thermal Electric Generator (TEG) Harvesting
• Wireless Sensor Networks (WSN)
• Low Power Wireless Monitoring
• Environmental Monitoring
• Bridge and Structural Health Monitoring (SHM)
• Smart Building Controls
• Portable and Wearable Health Devices
• Entertainment System Remote Controls

Description
The bq25570 device is specifically designed to
efficiently extract microwatts (µW) to milliwatts (mW)
of power generated from a variety of high output
impedance DC sources like photovoltaic (solar) or
thermal electric generators (TEG) without collapsing
those sources. The battery management features
ensure that a rechargeable battery is not overcharged
by this extracted power, with voltage boosted, or
depleted beyond safe limits by a system load. In
addition to the highly efficient boosting charger, the
bq25570 integrates a highly efficient, nano- power
buck converter for providing a second power rail to
systems such as wireless sensor networks (WSN)
which have stringent power and operational
demands. All the capabilities of bq25570 are packed
into a small foot-print 20-lead 3.5-mm x 3.5-mm QFN
package (RGR).