LTC4054L-4.2

PRODUCTION

150mA Standalone Linear Li-Ion Battery Charger in ThinSOT

Part Models: 2
1ku List Price: Starting From $1.89

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Part Details

Programmable Charge Current Range: 10mA to 150mA
No External MOSFET, Sense Resistor or Blocking Diode Required
Complete Linear Charger in ThinSOT^™ Package for Single Cell/Coin 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 Max Supply Current in Shutdown Mode
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Available in a 5-Lead Low Profile (1mm) SOT-23 Package

The LTC4054L is a complete, constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Its small size and ability to regulate low charge currents make the LTC4054L especially well-suited for portable applications using low capacity rechargeable lithium-ion coin cells. Furthermore, the LTC4054L 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 eliminate thermal overdesign. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The LTC4054L automatically terminates a 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 LTC4054L automatically enters a low current state, dropping the battery drain current to less than 2µA. The LTC4054L 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.

*U.S. Patent No. 6,522,118


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

Applications

Charger for Li-Ion Coin Cell Batteries
Portable MP3 Players, Wireless Headsets
Bluetooth Applications
Multifunction Wristwatches

Part Models: 2
1ku List Price: Starting From $1.89

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4054LES5-4.2#TRMPBF	5-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4054LES5-4.2#TRPBF	5-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
PowerPath, Ideal Diodes, and Load Switches 1
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LTC4360-1 LTC4360-2		Overvoltage Protection Controller

Tools & Simulations

LTspice 1

LTC4054L-4.2 - Battery Charger IC

Models for the following parts are available in LTspice:

LTC4054-4.2
LTC4054L-4.2
LTC4054X-4.2

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.

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Part Details

Documentation

Data Sheet 1

Reliability Data 2

Application Note 1

Hardware Ecosystem

Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

Latest Discussions

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