LTC3331

RECOMMENDED FOR NEW DESIGNS

Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Charger

Data Sheet Product Selection Table
Part Models
4
1ku List Price
Starting From $4.25
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Part Details

  • Dual Input, Single Output DC/DCs with Input Prioritizer
    • Energy Harvesting Input: 3.0V to 19V Buck DC/DC
    • Battery Input: Up to 4.2V Buck-Boost DC/DC
  • 10mA Shunt Battery Charger with Programmable Float Voltages: 3.45V, 4.0V, 4.1V, 4.2V
  • Low Battery Disconnect
  • Ultra Low Quiescent Current: 950nA at no Load
  • Integrated Supercapacitor Balancer
  • Up to 50mA of Output Current
  • Programmable DC/DC Output Voltage, Buck UVLO, and Buck-Boost Peak Input Current
  • Integrated Low-Loss Full-Wave Bridge Rectifier
  • Input Protective Shunt: Up to 25mA at VIN ≥ 20V
  • 5mm × 5mm QFN-32 Package
LTC3331
Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Charger
Charging a Battery with Harvested Energy Product Package 1
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Documentation

Data Sheet 1

User Guide 2

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
PowerPath, Ideal Diodes, and Load Switches 1
LTC4417
RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3331
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC2321A

Dust Energy Harvesting Demo Board with E-Ink Display, Designed to Connect to the DC2344A or DC2509A

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Product Details

Demonstration circuit 2321A is a low power wireless sensor node development platform equipped with an E-ink display for user feedback. The system is capable of monitoring and managing its available energy, logging information from sensors and sharing this data over a wireless network.


The board is designed to connect to the DC2344A or DC2509A energy harvesting demonstration boards which output a regulated power supply as well as status information from energy harvesting ICs and their backup batteries. Two coulomb counters on the DC2321A allow the processor to monitor the energy output of these batteries which will vary depending on the amount of energy which can be harvested from the system’s surroundings.


A DC2274A-A SmartMesh Manager must be used in order to evaluate the networking features of the DC2321A.

eval board
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC2151A

LTC3331EUH Demo Board | Dual Input, Buck Energy Harvester with 10mA Shunt Charger Plus Buck-Boost for Li Ion System Power, 3V ≤ VIN ≤ 18V; Adj 1.8V ≤ VOUT ≤ 5V

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Product Details

Demonstration Circuit DC2151A is a nanopower buckboost DC/DC with energy harvesting battery charger featuring the LTC3331. The LTC3331 integrates a high voltage energy harvesting power supply plus a DC/DC converter powered by a rechargeable cell battery to create a single output supply for alternative energy applications. The energy harvesting power supply, consisting of an integrated low-loss full-wave bridge with a high voltage buck converter, harvests energy from piezoelectric, solar or magnetic sources. The rechargeable cell input powers a buck-boost converter capable of operating down to 1.8V at its input. Either DC/DC converter can deliver energy to a single output. The buck operates when harvested energy is available, reducing the quiescent current drawn on the battery to essentially zero. The buck-boost takes over when harvested energy goes away.
DC2321A
Dust Energy Harvesting Demo Board with E-Ink Display, Designed to Connect to the DC2344A or DC2509A
DC2321A Evaluation Board
DC2151A
LTC3331EUH Demo Board | Dual Input, Buck Energy Harvester with 10mA Shunt Charger Plus Buck-Boost for Li Ion System Power, 3V ≤ VIN ≤ 18V; Adj 1.8V ≤ VOUT ≤ 5V
DC2151A Demo Board DC2151A Demo Board DC2151A Demo Board DC2151A Demo Board DC2151A - Schematic

Latest Discussions

4 Years Ago
RE: Combining Sources with LTC3331
4 Years Ago
RE: Piezo Energy Harvester to charge battery
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