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Small, Single-/Multi-Cell Solar Harvester with MPPT and Harvest Counter

World's Smallest Solar Harvester Increases Runtime and Reduces Size of Solar-Powered Devices

Product Details

The MAX20361 is a fully integrated solution for harvesting energy from single-/multi-cell solar sources. The device includes an ultra-low quiescent current (360nA) boost converter that is capable of starting from input voltages as low as 225mV (typ). In order to maximize the power extracted from the source, the MAX20361 implements a proprietary maximum power point tracking (MPPT) technique that allows efficient harvesting from 15μW to over 300mW of available input power.

The MAX20361 also features an integrated charging and protection circuit that is optimized for Li-ion batteries, but can also be used to charge supercapacitors, thin-film batteries, or traditional capacitors. The charger features a programmable charging cut-off voltage with thresholds programmable through I2C interface as well as temperature shutoff.

The MAX20361 is available in a 12-bump, 0.4mm pitch, 1.63mm x 1.23mm wafer-level package (WLP).

Key Features

  • Single-/Multi-Cell Solar Energy Harvester
    • 225mV to 2.5V (typ) Input-Voltage Range
    • Efficient Harvesting from 15μW to Over 300mW of Available Input Power
      • 86% Efficiency at VSYS = 3.8V, ISRC = 30mA
    • Small Solution Size
      • Utilizes Small 2016 4.7μH Inductor
  • Maximum Power Point Tracking (MPPT) Technique Using Fractional VOC Method
    • Programmable Fractional VOC Regulation Point through I2C Interface
  • Battery/Supercapacitor Charger
    • Programmable Battery Termination Voltage through I2C Interface
    • Programmable Power Good Wake-Up Signal Output Threshold through I2C Interface

Applications/Uses

  • Wearable Fitness
  • Medical Devices
  • Industrial IoT Sensors
  • Asset Tracking Devices
  • Wireless Sensor Networks
Parametric specs for Battery Chargers
Charging VIN (V) (max) 2.5
Cell Chemistry Li-Ion
Li-Polymer
Supercapacitor
# NiMH/ NiCd Cells 2
# Lithium Ion Cells 1
Charger (V) 4.0 to 4.75
Oper. Temp. (°C) -40 to +85
Package/Pins WLP/12
Budgetary
Price (See Notes)
$2.64 @1k
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Simplified Block Diagram

MAX20361: Simplified Block Diagram MAX20361: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX20361 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX20361 single/ multi-cell solar harvester with maximum power point tracking (MPPT) and harvest counter. The EV kit features a Pmod™ connector, allowing the USB2PMB2 adapter board to provide I2C interface.

The EV kit features an on-board adjustable current source and a monocrystalline solar cell to generate input current to the IC. It also features a supercapacitor and resistor load to evaluate the integrated charger of the MAX20361. The EV kit includes load current monitoring circuitry for convenient sensing of the MAX20361 output current.

The EV kit software controls the USB2PMB2 adapter board over the USB, which generates I2C commands. The EV kit ships with jumpers installed and supply volt- ages set to typical operating values.

View Details

Features

  • USB-Powered Operation
  • Proven High-Speed USB PCB Layout
  • Pmod I2C Interface
  • Flexible Configuration
  • On-Board Solar Cell and Current Monitoring
  • Windows® 8/Windows 10-Compatible GUI Software
  • Fully Assembled and Tested

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    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.

    Parameters

    Parametric specs for Battery Chargers
    Charging VIN (V) (max) 2.5
    Cell Chemistry Li-Ion
    Li-Polymer
    Supercapacitor
    # NiMH/ NiCd Cells 2
    # Lithium Ion Cells 1
    Charger (V) 4.0 to 4.75
    Oper. Temp. (°C) -40 to +85
    Package/Pins WLP/12
    Budgetary
    Price (See Notes)
    $2.64 @1k

    Key Features

    • Single-/Multi-Cell Solar Energy Harvester
      • 225mV to 2.5V (typ) Input-Voltage Range
      • Efficient Harvesting from 15μW to Over 300mW of Available Input Power
        • 86% Efficiency at VSYS = 3.8V, ISRC = 30mA
      • Small Solution Size
        • Utilizes Small 2016 4.7μH Inductor
    • Maximum Power Point Tracking (MPPT) Technique Using Fractional VOC Method
      • Programmable Fractional VOC Regulation Point through I2C Interface
    • Battery/Supercapacitor Charger
      • Programmable Battery Termination Voltage through I2C Interface
      • Programmable Power Good Wake-Up Signal Output Threshold through I2C Interface

    Applications/Uses

    • Wearable Fitness
    • Medical Devices
    • Industrial IoT Sensors
    • Asset Tracking Devices
    • Wireless Sensor Networks

    Description

    The MAX20361 is a fully integrated solution for harvesting energy from single-/multi-cell solar sources. The device includes an ultra-low quiescent current (360nA) boost converter that is capable of starting from input voltages as low as 225mV (typ). In order to maximize the power extracted from the source, the MAX20361 implements a proprietary maximum power point tracking (MPPT) technique that allows efficient harvesting from 15μW to over 300mW of available input power.

    The MAX20361 also features an integrated charging and protection circuit that is optimized for Li-ion batteries, but can also be used to charge supercapacitors, thin-film batteries, or traditional capacitors. The charger features a programmable charging cut-off voltage with thresholds programmable through I2C interface as well as temperature shutoff.

    The MAX20361 is available in a 12-bump, 0.4mm pitch, 1.63mm x 1.23mm wafer-level package (WLP).

    Simplified Block Diagram

    MAX20361: Simplified Block Diagram MAX20361: Simplified Block Diagram Zoom icon

    Technical Docs

    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.