LTC4085

PRODUCTION

USB Power Manager with Ideal Diode Controller and Li-Ion Charger

Part Details

  • Seamless Transition Between Input Power Sources: Li-Ion Battery, USB and 5V Wall Adapter
  • 215mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provide Low Loss PowerPath When Wall Adapter/USB Input Not Present
  • Load Dependent Charging Guarantees Accurate USB Input Current Compliance
  • Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating
  • Selectable 100% or 20% Input Current Limit (e.g., 500mA/100mA)
  • Battery Charge Current Independently Programmable Up to 1.2A
  • Preset 4.2V Charge Voltage with 0.8% Accuracy
  • C/10 Charge Current Detection Output
  • NTC Thermistor Input for Temperature Qualified Charging
  • Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package
LTC4085
USB Power Manager with Ideal Diode Controller and Li-Ion Charger
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Documentation

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Low Voltage Hot Swap Controllers 1
LTC4361-1
LTC4361-2
Overvoltage/Overcurrent Protection Controller
USB Isolators 1
LTM2884 PRODUCTION Isolated USB Transceiver with Isolated Power
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Tools & Simulations

LTspice


Models for the following parts are available in LTspice:

  • LTC4085
  • LTC4085-1
  • LTC4085-3
  • LTC4085-4
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Evaluation Kits

eval board
DC937A

LTC4085EDE Demo Board | 700mA CC/CV Li-Ion Linear Charger, VIN = 4.5V to 5.5V

Product Details

Demonstration circuit DC937A is a complete power controller for a USB powered device. It is based on the LTC4085 and provides a constant-current, constant-voltage linear battery charger, a USB power manager with PowerPath management for the battery. The 700mA CC/CV timer terminated, temperature qualified, linear charger targets Li-Ion batteries, and the USB power manager insures compliance with the USB power specification and PowerPath management for the battery. The demo board's input voltage range is 4.5V to 5.5V.


 


DC937A
LTC4085EDE Demo Board | 700mA CC/CV Li-Ion Linear Charger, VIN = 4.5V to 5.5V

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