Download - LTC3108 Presentation
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2005 Linear Technology
Linear TechnologyCorporation
Tony ArmstrongDirector of Product Marketing - Power Products
2009Linear Technology
2
Energy Harvesting - Opportunity
Charge, supplement or replace batteries in systems where batteryuse is inconvenient, impractical, expensive or dangerous
Eliminate the need for wires to carry power or to transmit data
Smart wireless sensor networks to monitor and optimize complexindustrial processes, remote field installations and building HVAC
Harvesting otherwise wasted heat from industrial processes, solarpanels, internal combustion engines, etc.
Various consumer electronic accessory chargers
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2005 Linear Technology
2009Linear Technology
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Energy Harvesting Sources
Thermo-Electric Generator or Thermopile (Heat)
Piezo-Electric (Vibration or strain)
PhotoVoltaic (Light)
Galvanic (Moisture)
Coil/Magnet (Motion)
2009Linear Technology
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LTC3108: Ultra-Low Voltage (20mV) Step-Up converter and Power Manager
Operates from inputs aslow as 20mV
Selectable Fixed OutputVoltages
Unique Resonant Powerconverter / EnergyHarvester
Auxiliary LDO Manages Energy storage
between Reservoir and MainCout or Batt
Compact Step-up X-former
3x4mm DFN or GN16packages
Design: Dave Salerno
Transformer: Coilcraft LPR-6235
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2005 Linear Technology
2009Linear Technology
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LTC3108: Energy Harvesting Applications
Remote Industrial Sensor networks
HVAC monitoring and control
Building Automation
Predict ive Maintenance
Avionics
Automatic Metering
Free
Energy
Source
Energy
Harvester /
Manager
Sensors,
A/D,
UController
Wireless
transmitter /
receiver
TEG, PV, Piezo,
Electrochemical,
trees
LTC3108
Power Conversion and
Energy Management is
the Missing Link
2009Linear Technology
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LTC3108 Block Diagram Review
VOUT: Main Output
Charge Control and Prioritizer
VSTORE: Energy Reservoir
VOUT2: Switched VOUT
Digital Vout Select
3mA LDO: uControllerpower
Rectifier
Compact Step-Up transformer
20mV Vin Source
VAUX: Intermediate Charge storage andIC bias supply
Depletion ModeMOSFET
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2005 Linear Technology
2009Linear Technology
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LTC3108 Feature: 20mV Resonant Boost Topology
20m V Operation or ~1deg dT if powered from a PeltierEffect Thermal Electric Generator (TEG or TEC)
LTC proprietary compound Depletion mode N-ChannelMOSFET makes extreme low voltage possible
Circuit Self-oscillates, resonant circuit formed by Lmag andCg
Built-in Synchronous rectification improves Energyharvesting yield
1 :100 transformer i sstandard Coilcraft part (LPR-6235),6mm x 6mm x 3.5mm
2009Linear Technology
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LTC3108: Typical Performance
Key Points:
Average Power for the App, must be 10s of mWs or less
Higher Sample Rates = Higher dT or betterTEG required
Best Performance is obtained with lowest Rs TECs/TEGs
LTC3108: Typical Performance Data
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2005 Linear Technology
2009Linear Technology
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LTC3108: More Typical Performance Data
Key Points:
Bigger Area TEG = More mV per delta T, bu t also more ESR
Small dT Use 1:100 transformer
Large dT Use 1:50 or 1:20 or lower turns ratio transformers
2009Linear Technology
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LTC3108: TEG / TEG Reference Data
Remember: Bigger TEG doesnt always mean more available power!
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2005 Linear Technology
2009Linear Technology
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LTC3108: Indoor Light Powered PhotoVoltaic Charger
~200 to 300mV available fromsmall Solar Cells with Indoorlighting
Battery or Storage Capacitor onoutput is trickle charged
1:20 transformer maximizes powerdelivery (charging current)
Potential Applications:
Autonomous Proximity Sensors
Battery-less Smoke/Gas detectors
2009Linear Technology
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LTC3108: Demo Circuit DC1582A
Rev.B will use the 3x4mm DFN package.
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2005 Linear Technology
2009Linear Technology
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LTC3108: Schedule
Datasheet: Now
First Samples: Now
Demo Boards: Now
Product Release Date: December 1, 2009