LTC4070 - Li-Ion/Polymer Shunt Battery Charger System

Features

  • 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 x 3mm) DFN and MSOP Packages

Typical Application

LTC4070 Typical Application
LTC4070 Typical Application

Description

The LTC®4070 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 x 3mm) DFN and an 8-lead MSOP package.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC4070EDDB#PBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC4070EDDB#TRMPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC4070EDDB#TRPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC4070EMS8E#PBF MS-8E MS8E E 05-08-1662 Yes
LTC4070EMS8E#TRPBF MS-8E MS8E E 05-08-1662 Yes
LTC4070IDDB#PBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC4070IDDB#TRMPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC4070IDDB#TRPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC4070IMS8E#PBF MS-8E MS8E I 05-08-1662 Yes
LTC4070IMS8E#TRPBF MS-8E MS8E I 05-08-1662 Yes


LTC4070 Package Drawing
LTC4070 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC4070EDDB#PBF 3x2 DFN-8 E $2.94 Yes
LTC4070EDDB#TRMPBF 3x2 DFN-8 E $2.94 $2.11 Yes
LTC4070EDDB#TRPBF 3x2 DFN-8 E $2.94 $2.06 Yes
LTC4070EMS8E#PBF MS-8E E $3.14 $2.20 Yes
LTC4070EMS8E#TRPBF MS-8E E $2.26 Yes
LTC4070IDDB#PBF 3x2 DFN-8 I $3.30 Yes
LTC4070IDDB#TRMPBF 3x2 DFN-8 I $3.30 $2.36 Yes
LTC4070IDDB#TRPBF 3x2 DFN-8 I $3.30 $2.31 Yes
LTC4070IMS8E#PBF MS-8E I $3.62 $2.53 Yes
LTC4070IMS8E#TRPBF MS-8E I $2.59 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1584A LTC4070EDDB Demo Board | Simple Low-IQ Battery Charger/Protector with NTC Thermistor Input $100.00
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Click here to view our complete list of demo boards

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

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Design Tools

LTspice

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Models for the following parts are available in LTspice:
LTC4070

Technical Support