LTC4090-3 - USB Power Manager with 2A High Voltage Bat-Track Buck Regulator


  • Seamless Transition Between Power Sources: Li-Ion Battery, USB, and 6V to 36V Supply (60V Max)
  • 2A Output High Voltage Buck Regulator with Bat-Track™ Adaptive Output Control
  • 3.95V Float Voltage Improves Battery Life Span and High Temperature Safety Margin
  • Internal 215mW Ideal Diode Plus Optional External Ideal Diode Controller Provides Low Loss Power Path When External Supply/ USB Not Present
  • Load Dependent Charging from USB Input Guarantees Current Compliance
  • Full Featured Li-Ion Battery Charger
  • 1.5A Maximum Charge Current with Thermal Limiting
  • NTC Thermistor Input for Temperature Qualified Charging
  • Tiny (3mm × 6mm × 0.75mm) 22-Pin DFN Package

Typical Application

LTC4090-3 Typical Application
LTC4090-3 Typical Application


The LTC®4090-3 is a USB power manager plus high voltage Li-Ion/Polymer battery charger. The 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 LTC4090-3 also accommodates high voltage power supplies, such as 12V AC/DC wall adapters, Firewire, or automotive power.

The LTC4090 provides a Bat-Track adaptive output that tracks the battery voltage for high efficiency charging from the high voltage input. This 3.95V version of the standard LTC4090 is intended for applications which have extended battery lifetime requirements or those that require high temperature (>60°C) operation or storage under these conditions. A reduced float voltage will trade off initial cell capacity for the benefit of increased capacity retention over the life of the battery. The charge current is programmable and an end-of-charge status output (CHRG) indicates full charge.

 Float Voltage (V)NTC Hot ThresholdBat-Track Adaptive HV Output
LTC4090 4.2V 29% VVNTC Yes
LTC4090-3 3.95V 32.6% VVNTC Yes
LTC4090-5 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
LTC4090EDJC-3#PBF 6x3 DFN-22 DJC E 05-08-1714 Yes
LTC4090EDJC-3#TRPBF 6x3 DFN-22 DJC E 05-08-1714 Yes

LTC4090-3 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
LTC4090EDJC-3#PBF 6x3 DFN-22 E $4.64 $3.25 Yes
LTC4090EDJC-3#TRPBF 6x3 DFN-22 E $3.31 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


  • Embedded Automotive Accessories
  • Personal Navigation Devices
  • Other USB-Based Handheld Products

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