LTC4054X-4.2

PRODUCTION

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

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

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Part Details

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

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
LTC4054XES5-4.2#TRMPBF	5-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4054XES5-4.2#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
Protection Switches & Controllers 2
LTC4361-1 LTC4361-2		Overvoltage/Overcurrent Protection Controller
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller

Tools & Simulations

LTspice 1

LTC4054X-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:

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