LTC4155 - Dual Input Power Manager/ 3.5A Li-Ion Battery Charger with I2C Control and USB OTG


  • High Efficiency Charger Capable of 3.5A Charge Current
  • Monolithic Switching Regulator Makes Optimal Use of Limited Power and Thermal Budget
  • Dual Input Overvoltage Protection Controller
  • Priority Multiplexing for Multiple Inputs
  • I2C/SMBus Control and Status Feedback
  • NTC Thermistor ADC for Temperature Dependent Charge Algorithms (JEITA)
  • Instant-On Operation with Low Battery
  • Battery Ideal Diode Controller for Power Management
  • USB On-The-Go Power Delivery to the USB Port
  • Full Featured Li-Ion/Polymer Battery Charger with Four Float Voltage Settings
  • 28-Lead 4mm × 5mm QFN Package

Typical Application

LTC4155 Typical Application
LTC4155 Typical Application


The LTC®4155 is a 15 watt I2C controlled power manager with PowerPath™ instant-on operation, high efficiency switching battery charging and USB compatibility. The LTC4155 seamlessly manages power distribution from two 5V sources, such as a USB port and a wall adapter, to a single-cell rechargeable Lithium-Ion/Polymer battery and a system load.

The LTC4155’s switching battery charger automatically limits its input current for USB compatibility, or may draw up to 3A from a high power wall adapter. The high efficiency step-down switching charger is designed to provide maximum power to the application and reduced heat in high power density applications.

I2C adjustability of input current, charge current, battery float voltage, charge termination, and many other parameters allows maximum flexibility. I2C status reporting of key system and charge parameters facilitates intelligent control decisions. USB On-The-Go support provides 5V power back to the USB port without any additional components. A dual-input, priority multiplexing, overvoltage protection circuit guards the LTC4155 from high voltage damage on the VBUS pin.

The LTC4155 is available in the low profile 28-lead 4mm × 5mm × 0.75mm QFN surface mount package.


For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4155EUFD#PBF 4x5 QFN-28 UFD E 05-08-1712 RoHS
LTC4155EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1712 RoHS
LTC4155IUFD#PBF 4x5 QFN-28 UFD I 05-08-1712 RoHS
LTC4155IUFD#TRPBF 4x5 QFN-28 UFD I 05-08-1712 RoHS

LTC4155 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Temp Price
LTC4155EUFD#PBF 4x5 QFN-28 E $4.22 $2.95 View
LTC4155EUFD#TRPBF 4x5 QFN-28 E $3.01 View
LTC4155IUFD#PBF 4x5 QFN-28 I $4.64 $3.25 View
LTC4155IUFD#TRPBF 4x5 QFN-28 I $3.31 View
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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
DC1674A-A LTC4155EUFD Demo Board I VIN = 4.35V to 5.5V, Dual Input Li-Ion Charger with USB OTG, VOUT = 4.5V, VBATT = 4.05V to 4.2V @ 3.5A; DC590B Demo Board required $150.00
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Companion Boards

Part Number Description Price Documentation
DC590B USB Serial Controller for Linear Technology QuikEval Demo Boards $50.00
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Click here to view our complete list of demo boards


  • Tablet PCs
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  • Digital Cameras, GPS, PDAs
  • Smart Phones
  • Portable Medical Devices

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Design Tools

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