LTC4054-4.2

PRODUCTION

Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT

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Overview

  • Programmable Charge Current Up to 800mA
  • No MOSFET, Sense Resistor or Blocking Diode Required
  • Complete Linear Charger in ThinSOT™ Package for Single Cell Lithium-Ion Batteries
  • Constant-Current/Constant-Voltage Operation with Thermal Regulation* to Maximize Charge Rate Without Risk of Overheating
  • Charges Single Cell Li-Ion Batteries Directly from USB Port
  • Preset 4.2V Charge Voltage with ±1% Accuracy
  • Charge Current Monitor Output for Gas Gauging*
  • Automatic Recharge
  • Charge Status Output Pin
  • C/10 Charge Termination
  • 25µA Supply Current in Shutdown
  • 2.9V Trickle Charge Threshold (LTC4054)
  • Available Without Trickle Charge (LTC4054X)
  • Soft-Start Limits Inrush Current
  • Available in 5-Lead SOT-23 Package

The LTC4054 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the LTC4054 ideally suited for portable applications. Furthermore, the LTC4054 is specifically designed to work within USB power specifications.

No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The LTC4054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.

When the input supply (wall adapter or USB supply) is removed, the LTC4054 automatically enters a low current state, dropping the battery drain current to less than 2µA. The LTC4054 can be put into shutdown mode, reducing the supply current to 25µA.

Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.


 Max Charge Current Trickle Charge
LTC4054-4.2 800mA Yes
LTC4054X-4.2 800mA No
LTC4054L-4.2 150mA Yes

Applications

  • Cellular Telephones, PDAs, MP3 Players
  • Charging Docks and Cradles
  • Bluetooth Applications
LTC4054-4.2
Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
600mA Single Cell Li-Ion Charger Complete Charge Cycle (750mAh Battery) Product Package 1
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Documentation

Data Sheet 1

Reliability Data 2

User Guide 1

Application Note 1

Technical Articles 1

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
Protection Switches & Controllers 2
LTC4361-1
LTC4361-2
Overvoltage/Overcurrent Protection Controller
LTC4417
RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC4054-4.2
  • LTC4054L-4.2
  • LTC4054X-4.2
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
schematic 1
DC569B

LTC4054ES5-4.2 | Li-Ion Linear Battery Charger, 4.25V ≤ VIN ≤ 10V, 1-Cell @ 450mA/600mA ICHARGE

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Product Details

Demonstration circuit 569 is a single cell Li-Ion linear charger in a SOT-23. Charge rates as high as 600mA can be achieved due to the LTC4054’s internal die temperature control loop that prevents excessive PCB heating under worst-case conditions. The user is provided with a control jumper to select between OFF/450mA/600mA charge rates. The reduced charge rate is suitable for USB applications. A charge LED illuminates while the charger is charging the battery.
DC569B
LTC4054ES5-4.2 | Li-Ion Linear Battery Charger, 4.25V ≤ VIN ≤ 10V, 1-Cell @ 450mA/600mA ICHARGE
DC569B - Schematic

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