Power Management Battery Management Battery Charger IC Linear Battery Chargers

LTC4361-1/LTC4361-2 - Overvoltage/Overcurrent Protection Controller

LTC4068-4.2 - Standalone Linear Li-Ion Battery Charger with Programmable Termination

Features

  • Programmable Charge Current Up to 950mA
  • Complete Linear Charger in DFN Package
  • No MOSFET, Sense Resistor or Blocking Diode Required
  • Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
  • Charges Directly from a USB Port
  • Programmable Charge Current Termination
  • Preset 4.2V Charge Voltage with ±1% Accuracy
  • Charge Current Monitor Output for Gas Gauging*
  • Automatic Recharge
  • Charge Status Output
  • “AC Present” Output
  • 2.9V Trickle Charge Threshold (LTC4068)
  • Available Without Trickle Charge (LTC4068X)
  • Soft-Start Limits Inrush Current
  • Low Profile (3mm x 3mm x 0.75mm) DFN Package

Typical Application

LTC4068-4.2 Typical Application
LTC4068-4.2 Typical Application

Description

The LTC®4068 is a complete constant-current/constantvoltage linear charger for single cell lithium-ion batteries. Its DFN package and low external component count make the LTC4068 ideally suited for portable applications. Furthermore, the LTC4068 is designed to work within USB power specifications.

No external sense resistor or external blocking diode are required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature conditions. The charge voltage is fixed at 4.2V and the charge current is programmed with a resistor. The LTC4068 terminates the charge cycle when the charge current drops below the programmed termination threshold after the final float voltage is reached.

When the input supply (wall adapter or USB supply) is removed, the LTC4068 enters a low current state dropping the battery drain current to less than 2µA. Other features include charge current monitor, undervoltage lockout, automatic recharge and status pins to indicate charge termination and the presence of adequate input voltage.

Protected by U.S. Patents, including 6522118.

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
LTC4068EDD-4.2#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC4068EDD-4.2#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC4068XEDD-4.2#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LTC4068XEDD-4.2#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes


LTC4068-4.2 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
LTC4068EDD-4.2#PBF 3x3 DFN-8 E $2.41 $1.70 Yes
LTC4068EDD-4.2#TRPBF 3x3 DFN-8 E $1.80 Yes
LTC4068XEDD-4.2#PBF 3x3 DFN-8 E $2.41 $1.70 Yes
LTC4068XEDD-4.2#TRPBF 3x3 DFN-8 E $1.80 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
DC766A LTC4068EDD-4.2 | 800mA Stand Alone Li-Ion Charger, Vin = 4.5V - 6.3V, Vout = 800mA Charge, 40mA Termination Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Cellular Telephones, PDAs, MP3 Players
  • Bluetooth Applications

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