LTC4089-1 - USB Power Manager with High Voltage Switching Charger


  • Seamless Transition Between Power Sources: Li-Ion Battery, USB, and 6V to 36V External Supply
  • High Efficiency 1.2A Charger from 6V to 36V Input
  • Load Dependent Charging from USB Input Guarantees Current Compliance
  • 215mΩ Internal Ideal Diode plus Optional External Ideal Diode Controller Provides Low Loss Power Path When External Supply/USB Not Present
  • Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate without Risk of Overheating
  • Selectable 100% or 20% Current Limit (e.g., 500mA/ 100mA) from USB Input
  • Preset 4.1V Charge Voltage with 0.8% Accuracy
  • C/10 Charge Current Detection Output
  • NTC Thermistor Input for Temperature Qualified Charging
  • Tiny (6mm x 3mm x 0.75mm) 22-Pin DFN Package

Typical Application

LTC4089-1 Typical Application
LTC4089-1 Typical Application


The LTC4089-1 is a USB power manager plus high voltage Li-Ion battery charger. This device controls the total current used by the USB peripheral for operation and battery charging. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit. The LTC4089-1 also accommodates high voltage power supplies, such as 12V AC-DC wall adapters, FireWire, or automotive power.

The LTC4089-1 provides a fixed 5V output from the high voltage input to charge single cell Li-Ion batteries. The charge current is programmable and an end-of-charge status output (CHRG) indicates full charge. Also featured is programmable total charge time, an NTC thermistor input used to monitor battery temperature while charging and automatic recharging of the battery.

Part NumberFloat VoltageNTC Hot ThresholdBat-Track HV Output
LTC4089 4.2V 29% Vvntc Yes
LTC4089-1 4.1V 32.6% Vvntc No
LTC4089-3 3.95V 32.6% Vvntc Yes
LTC4089-5 4.2V 29% Vvntc No


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
LTC4089EDJC-1#PBF 6x3 DFN-22 DJC E 05-08-1714 Yes
LTC4089EDJC-1#TRPBF 6x3 DFN-22 DJC E 05-08-1714 Yes

LTC4089-1 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
LTC4089EDJC-1#PBF 6x3 DFN-22 E $4.21 $2.95 Yes
LTC4089EDJC-1#TRPBF 6x3 DFN-22 E $3.01 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.

Click here to view our complete list of demo boards


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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
  • And More!

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