LTC4079 - 60V, 250mA Linear Charger with Low Quiescent Current

Features

  • Wide Input Voltage Range: 2.7V to 60V
  • Adjustable Battery Voltage: 1.2V to 60V
  • Adjustable Charge Current: 10mA to 250mA
  • Low Quiescent Current While Charging: IIN = 4μA
  • Ultralow Battery Drain When Shutdown or Charged: IBAT < 0.01μA
  • Auto Recharge
  • Input Voltage Regulation for High Impedance Sources
  • Thermal Regulation Maximizes Output Current without Overheating
  • Constant Voltage Feedback with ±0.5% Accuracy
  • NTC Thermistor Input for Temperature Qualified Charging
  • Adjustable Safety Timer
  • Charging Status Indication
  • Thermally Enhanced 10-Lead (3mm × 3mm) DFN Package

Typical Application

LTC4079 Typical Application
LTC4079 Typical Application

Description

The LTC®4079 is a low quiescent current, high voltage linear charger for most battery chemistry types including Li-Ion/Polymer, Lead-Acid or NiMH battery stacks up to 60V. The maximum charge current is adjustable from 10mA to 250mA with an external resistor. The battery charge voltage is set using an external resistor divider.

With an integrated power device, current sensing and reverse current protection, a complete charging solution using the LTC4079 requires very few external components. Thermal regulation ensures maximum charge current up to the specified limit without the risk of overheating. Charging can be terminated by either C/10 or adjustable timer.

Input voltage regulation reduces charge current when the input voltage falls to an adjustable level or the battery voltage, making it well suited for energy harvesting applications. Other features include temperature qualified charging, bad battery detection, automatic recharge with sampled feedback in standby for negligible battery drain, and an open-drain CHRG status output. The device is offered in a compact, thermally enhanced 10-lead (3mm × 3mm) DFN 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
LTC4079EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC4079EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC4079IDD#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4079IDD#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes


LTC4079 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
LTC4079EDD#PBF 3x3 DFN-10 E $3.36 $2.35 Yes
LTC4079EDD#TRPBF 3x3 DFN-10 E $2.41 Yes
LTC4079IDD#PBF 3x3 DFN-10 I $3.86 $2.70 Yes
LTC4079IDD#TRPBF 3x3 DFN-10 I $2.76 Yes
Buy NowRequest Samples
* 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
DC2133A LTC4079 Demo Board | 2.7V-60Vin, 250mA Linear Charger with Low Quiescent Current $125.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • Embedded Automotive and Industrial
  • Backup Battery Charging from Another Battery
  • Energy Harvesting Charger
  • Thin Film Battery Products

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LTC4079

Technical Support