LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection


  • Switching Regulator with Bat-Track™ Adaptive Output Control Makes Optimal Use of Limited Power Available from USB Port to Charge Battery and Power Application
  • Charge Control Algorithm Specifically Designed for LiFePO4 (Lithium Iron Phosphate)
  • Overvoltage Protection Guards Against Damage
  • Bat-Track External Step-Down Switching Regulator Control Maximizes Efficiency from Automotive, Firewire and Other High Voltage Input Sources
  • 180mΩ Internal Ideal Diode Plus External Ideal Diode Controller Seamlessly Provide Low Loss PowerPath™ When Input Power Is Limited or Unavailable
  • Preset 3.6V Charge Voltage with 0.5% Accuracy
  • Instant-On Operation with Discharged Battery
  • 700mA Maximum Load Current from USB Port
  • 2A Maximum Input Current from Internal Switching Regulator
  • 1.5A Maximum Charge Current with Thermal Limiting
  • 20-Lead 3mm × 4mm × 0.75mm QFN Package

Typical Application

LTC4098-3.6 Typical Application
LTC4098-3.6 Typical Application


The LTC4098-3.6 is a high efficiency USB PowerPath controller and full-featured LiFePO4 battery charger. It seamlessly manages power distribution from multiple sources including USB, wall adapter, automotive, Firewire or other high voltage DC/DC converters, and a LiFePO4 battery.

The LTC4098-3.6 charge algorithm is optimized for LiFePO4 by implementing a 1-hour float voltage termination timer and a 0°C to 60°C NTC-based charge qualification range. Furthermore, completely discharged batteries are charged at the full programmed charge current.

The LTC4098-3.6’s switching regulator can automatically limit its input current for USB compatibility. For automotive and other high voltage applications, the LTC4098‑3.6 interfaces with an external switching regulator. Both the USB input and the auxiliary input controller feature Bat-Track optimized charging to provide maximum power to the application and reduced heat in high power density applications with input supplies from 5V to as high as 38V.

An overvoltage protection circuit guards the LTC4098-3.6 from high voltage damage on the VBUS pin with just two external components.

The LTC4098-3.6 is available in a 20-lead 3mm × 4mm × 0.75mm QFN surface mount package.

  Float Voltage
LTC4098 4.2V (1-cell Li-Ion/Li-Polymer)
LTC4098-1 4.1V (1-cell Li-Ion/Li-Polymer)
LTC4098-3.6 3.6V (1-cell LiFePO4)


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
LTC4098EUDC-3.6#PBF 3x4 QFN-20 UDC E 05-08-1742 Yes
LTC4098EUDC-3.6#TRPBF 3x4 QFN-20 UDC E 05-08-1742 Yes

LTC4098-3.6 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
LTC4098EUDC-3.6#PBF 3x4 QFN-20 E $3.79 $2.65 Yes
LTC4098EUDC-3.6#TRPBF 3x4 QFN-20 E $2.71 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
DC1701A LTC4098-3.6 with HV Buck regulator plug in interface $150.00
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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
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