LTC4071 - Li-Ion/Polymer Shunt Battery Charger System with Low Battery Disconnect
Features
- 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
AEC-Q100 data available for specific packages
Typical Application
Description
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.
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 |
|---|---|---|---|---|---|
| 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-8 | MS8 | E | 05-08-1660 | Yes |
| LTC4071EMS8E#TRPBF | MS-8 | MS8 | E | 05-08-1660 | 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-8 | MS8 | I | 05-08-1660 | Yes |
| LTC4071IMS8E#TRPBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
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 | |
|---|---|---|---|---|---|---|
| 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-8 | E | $3.29 | $2.30 | Yes | |
| LTC4071EMS8E#TRPBF | MS-8 | 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-8 | I | $3.79 | $2.65 | Yes | |
| LTC4071IMS8E#TRPBF | MS-8 | I | $3.85 | $2.71 | Yes | |
| Buy Now • Request Samples | ||||||
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 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4071IMS8E#PBF | MS-8 | I | $3.79 | $2.65 | Yes | |
| LTC4071IMS8E#TRPBF | MS-8 | I | $3.85 | $2.71 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- 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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Design Tools
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LTC4071
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
