LTC4071 - Li-Ion/Polymer Shunt Battery Charger System with Low Battery Disconnect


  • Charger Plus Pack Protection in One IC
  • Low Operating Current (550nA)
  • Near Zero Current (<0.1nA) Low Battery Disconnect Function to Protect Batteries from Over-Discharge
  • Pin Selectable Low Battery Disconnect Level: 2.7V or 3.2V
  • 1% Float Voltage Accuracy Over Temperature
  • 50mA Maximum Internal Shunt Current
  • 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
  • High Battery Status Output
  • Thermally Enhanced, Low Profile (0.75mm) 8-lead (2mm × 3mm) DFN and MSOP Packages

Typical Application

LTC4071 Typical Application
LTC4071 Typical Application


The LTC4071 allows simple charging of Li-Ion/Polymer batteries from very low current, intermittent or continuous charging sources. A near-zero current low battery latching disconnect function protects even the lowest capacity batteries from deep discharge and potentially irreparable damage. The 550nA to 50mA operating current makes charging possible from previously unusable sources. With its low operating current the LTC4071 is well suited to charge low capacity Li-Ion or thin film batteries in energy harvesting applications. The unique architecture of the LTC4071 allows for an extremely simple battery charger solution, requiring just one external resistor.

The LTC4071 offers a pin selectable float voltage with ±1% accuracy. 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 LTC4071 also provides two pin selectable low battery disconnect levels and a high battery status output.

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.


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
LTC4071EDDB#PBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC4071EDDB#TRMPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC4071EDDB#TRPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LTC4071EMS8E#PBF MS-8E MS8E E 05-08-1662 Yes
LTC4071EMS8E#TRPBF MS-8E MS8E E 05-08-1662 Yes
LTC4071IDDB#PBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC4071IDDB#TRMPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC4071IDDB#TRPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC4071IMS8E#PBF MS-8E MS8E I 05-08-1662 Yes
LTC4071IMS8E#TRPBF MS-8E MS8E I 05-08-1662 Yes

LTC4071 Package Drawing
LTC4071 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
LTC4071EDDB#PBF 3x2 DFN-8 E $3.14 Yes
LTC4071EDDB#TRMPBF 3x2 DFN-8 E $3.14 $2.25 Yes
LTC4071EDDB#TRPBF 3x2 DFN-8 E $3.14 $2.20 Yes
LTC4071EMS8E#PBF MS-8E E $3.29 $2.30 Yes
LTC4071EMS8E#TRPBF MS-8E E $3.35 $2.36 Yes
LTC4071IDDB#PBF 3x2 DFN-8 I $3.62 Yes
LTC4071IDDB#TRMPBF 3x2 DFN-8 I $3.62 $2.58 Yes
LTC4071IDDB#TRPBF 3x2 DFN-8 I $3.62 $2.53 Yes
LTC4071IMS8E#PBF MS-8E I $3.79 $2.65 Yes
LTC4071IMS8E#TRPBF MS-8E I $3.85 $2.71 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
DC1702A LTC4071EDDB Demo Board | Shunt Li Ion Charger, 10V ≤ VIN ≤ 16V, 4.1Vout @ 50mA $100.00
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Click here to view our complete list of demo boards


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

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