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  2. Power Management
  3. Energy Harvesting
  4. LTC4070


Overview

Features and Benefits

  • Low Operating Current (450nA)
  • 1% Float Voltage Accuracy Over Full Temperature and Shunt Current Range
  • 50mA Maximum Internal Shunt Current (500mA with External PFET)
  • Pin Selectable Float Voltage Options: 4.0V, 4.1V, 4.2V
  • Ultralow Power Pulsed NTC Float Conditioning for Li-Ion/Polymer Protection
  • Suitable for Intermittent, Continuous and Very Low Power Charging Sources
  • Low and High Battery Status Outputs
  • Simple Low Voltage Load Disconnect Application
  • Thermally Enhanced, Low Profile (0.75mm) 8-Lead (2mm × 3mm) DFN and MSOP Packages

Product Details

The LTC4070 allows simple charging of Li-Ion/Polymer batteries from very low current, intermittent or continuous charging sources. The 450nA to 50mA operating current makes charging possible from previously unusable sources. With the addition of an external pass device, shunt current may be boosted to 500mA. Stacked cell high voltage battery packs are inherently balanced with shunt charging. With its low operating current, the LTC4070 is well suited to charge thin film batteries in energy harvesting applications where charging sources may be intermittent or very low power. The unique architecture of the LTC4070 allows for an extremely simple battery charger solution; requiring just one external resistor.

The LTC4070 offers a pin selectable float voltage with 1% accuracy across the full range of operating temperature and shunt current. The integrated thermal battery qualifier extends battery lifetime and improves reliability by automatically reducing the battery float voltage at NTC thermistor temperatures above 40°C. The LTC4070 also provides both low and high battery status outputs. For applications requiring pack protection, see LTC4071.

The device is offered in two thermally enhanced packages, a compact low profile (0.75mm) 8-lead (2mm × 3mm) DFN and an 8-lead MSOP package.

Applications

  • Low Power Li-Ion/Polymer Battery Back-Up
  • Solar Power Systems with Back-Up
  • Memory Back-Up
  • Embedded Automotive
  • Thin Film Batteries
  • Energy Scavenging/Harvesting

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Documentation & Resources

Tools & Simulations

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.

LTspice

Models for the following parts are available in LTspice:

LTC4070

Product Recommendations

LTC4070 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC4070EDDB#TRMPBF Material Declaration Reliability Data 8-Lead DFN (3mm x 2mm w/ EP)
LTC4070EDDB#TRPBF Material Declaration Reliability Data 8-Lead DFN (3mm x 2mm w/ EP)
LTC4070EMS8E#PBF Material Declaration Reliability Data 8-Lead MSOP w/ EP
LTC4070EMS8E#TRPBF Material Declaration Reliability Data 8-Lead MSOP w/ EP
LTC4070IDDB#TRMPBF Material Declaration Reliability Data 8-Lead DFN (3mm x 2mm w/ EP)
LTC4070IDDB#TRPBF Material Declaration Reliability Data 8-Lead DFN (3mm x 2mm w/ EP)
LTC4070IMS8E#PBF Material Declaration Reliability Data 8-Lead MSOP w/ EP
LTC4070IMS8E#TRPBF Material Declaration Reliability Data 8-Lead MSOP w/ EP
Wafer Fabrication Data R540 Reliability Data

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Evaluation Boards

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.