LTC4088 - High Efficiency Battery Charger/USB Power Manager


  • Switching Regulator Makes Optimal Use of Limited  Power Available from USB Port to Charge Battery  and Power Application
  • 180mΩ Internal Ideal Diode Plus Optional External  Ideal Diode Controller Seamlessly Provides Low  Loss Power Path When Input Power is Limited or  Unavailable
  • Full Featured Li-Ion/Polymer Battery Charger
  • VBUS Operating Range: 4.25V to 5.5V (7V Absolute  Maximum—Transient)
  • 1.2A Maximum Input Current Limit
  • 1.5A Maximum Charge Current with Thermal Limiting
  • Bat-Track Adaptive Output Control
  • Slew Control Reduces Switching EMI
  • Low Profile (0.75mm) 14-Lead 4mm × 3mm DFN Package

Typical Application

LTC4088 Typical Application
LTC4088 Typical Application


The LTC4088 is a high efficiency USB PowerPath controller and Li-Ion/Polymer battery charger. It includes a synchronous switching input regulator, a full-featured battery charger and an ideal diode. Designed specifically for USB applications, the LTC4088’s switching regulator automatically limits its input current to either 100mA, 500mA or 1A for wall-powered applications via logic control.

The switching input stage provides power to VOUT where power sharing between the application circuit and the battery charger is managed. Unlike linear PowerPath controllers, the LTC4088’s switching input stage can use nearly all of the 0.5W or 2.5W available from the USB port with minimal power dissipation. This feature allows the LTC4088 to provide more power to the application and eases thermal issues in space-constrained applications.

An ideal diode ensures that system power is available from the battery when the input current limit is reached or if the USB or wall supply is removed.

The LTC4088 is available in the low profile 14-Lead 4mm × 3mm × 0.75mm DFN surface mount package.

 Input Logic Truth TableAutomatic Charge Current Reduction3.3V LDO
LTC4088 Battery charger enabled with all logic inputs grounded No Yes
LTC4088-1 Battery charger enabled with all logic inputs grounded Yes No
LTC4088-2 Battery charger enabled with all logic inputs grounded Yes 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
LTC4088EDE#PBF 4x3 DFN-14 DE E 05-08-1708 Yes
LTC4088EDE#TRPBF 4x3 DFN-14 DE E 05-08-1708 Yes

LTC4088 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
LTC4088EDE#PBF 4x3 DFN-14 E $3.14 $2.20 Yes
LTC4088EDE#TRPBF 4x3 DFN-14 E $2.26 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
DC1007B LTC4088EDE Demo Board | USB/Wall Adapter Input, Li-Ion Battery Charger/Power Manager, 0.5A IOUT $150.00
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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
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