Power Management Battery Management Battery Charger IC Linear Battery Chargers

LTC4360-1/LTC4360-2 - Overvoltage Protection Controller

LTC4097 - USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger

Features

  • Charges Single-Cell Li-Ion/Polymer Battery from Wall Adapter and USB Inputs
  • Automatic Input Detection (Wall Adapter Input has Charging Priority)
  • Charge Current Programmable up to 1.2A from Wall Adapter Input
  • Programmable Charge Current Termination
  • NTC Thermistor Input for Temperature Qualified Charging
  • Independent DC, USB Charge Current Programming
  • Preset Float Voltage with ±0.6% Accuracy
  • Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
  • Charge Status Output
  • Automatic Recharge
  • 20µA Charger Quiescent Current in Shutdown
  • Available in a Thermally Enhanced, Low Profi le (0.75mm) 12-Lead (3mm × 2mm) DFN Package

Typical Application

LTC4097 Typical Application
LTC4097 Typical Application

Description

The LTC4097 is a standalone linear battery charger that is capable of charging a single-cell Li-Ion or Li-Polymer battery from both wall adapter and USB inputs. The charger can detect power at the inputs and automatically select the appropriate power source for charging.

No external sense resistor or blocking diode is required for charging due to the internal MOSFET architecture. Internal thermal feedback regulates the battery charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The float voltage is fixed at 4.2V and the charge current is programmed with an external resistor. The LTC4097 terminates the charge cycle when the charge current drops below the user programmed termination threshold after the final float voltage is reached. The LTC4097 can be put into shutdown mode reducing the DCIN supply current to 20µA, the USBIN supply current to 10µA, and the battery drain current to less than 2µA even with power applied to both inputs.

Other features include trickle charge, automatic recharge, undervoltage lockout, charge status output, an NTC thermistor input used to monitor battery temperature and VNTC power present output with 120mA drive capability.

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
LTC4097EDDB#PBF 3x2 DFN-12 DDB E 05-08-1723 Yes
LTC4097EDDB#TRMPBF 3x2 DFN-12 DDB E 05-08-1723 Yes
LTC4097EDDB#TRPBF 3x2 DFN-12 DDB E 05-08-1723 Yes


LTC4097 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
LTC4097EDDB#PBF 3x2 DFN-12 E $2.23 Yes
LTC4097EDDB#TRMPBF 3x2 DFN-12 E $2.23 $1.61 Yes
LTC4097EDDB#TRPBF 3x2 DFN-12 E $2.23 $1.56 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
DC1101A LTC4097EDDB Demo Board | Dual Input Standalone Li-Ion Battery Charger w/ NTC $75.00
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Click here to view our complete list of demo boards

Applications

  • Cellular Telephones
  • MP3 Players
  • Portable Handheld Devices

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