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
AEC-Q100 data available for specific packages
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-8 | MS8 | E | 05-08-1660 | Yes |
| LTC4070EMS8E#TRPBF | MS-8 | MS8 | E | 05-08-1660 | 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-8 | MS8 | I | 05-08-1660 | Yes |
| LTC4070IMS8E#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 | |
|---|---|---|---|---|---|---|
| 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-8 | E | $3.14 | $2.20 | Yes | |
| LTC4070EMS8E#TRPBF | MS-8 | 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-8 | I | $3.62 | $2.53 | Yes | |
| LTC4070IMS8E#TRPBF | MS-8 | I | $2.59 | 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 |
|---|---|---|---|
| DC1584A | LTC4070EDDB Demo Board | Simple Low-IQ Battery Charger/Protector with NTC Thermistor Input | $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 | |
|---|---|---|---|---|---|---|
| LTC4070IMS8E#PBF | MS-8 | I | $3.62 | $2.53 | Yes | |
| LTC4070IMS8E#TRPBF | MS-8 | I | $2.59 | Yes | ||
| Buy Now • Request Samples | ||||||
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
- 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.
