LTC4054 Single-cell Lithium-ion Battery: Circuits, Pinout, and Datasheet [Video]

The LTC4054 is a single-cell lithium-ion battery charger with a complete constant-current/constant-voltage linear charger. The LTC4054 is appropriate for portable applications because to its ThinSOT packaging and low external component count. Furthermore, the LTC4054 was created to work under USB power standards.

The integrated MOSFET architecture eliminates the need for an external sensing resistor and a blocking diode. Thermal feedback controls the charge current to keep the die from overheating when the power is high or the ambient temperature is high. The charge voltage is set at 4.2V, and the charge current is controlled by a single resistor. When the charge current reduces to 1/10th of the planned value after the final float voltage is reached, the LTC4054 automatically ends the charge cycle.

The LTC4054 automatically enters a low current state when the input supply (wall adapter or USB supply) is disconnected, lowering the battery drain current to less than 2μA. The LTC4054 can be switched to shutdown mode, which lowers the supply current to 25μA.

Charge current monitor, under voltage lockout, automated recharge, and a status pin to indicate charge termination and the presence of an input voltage are some of the other features.

The following figure is the pinout of LTC4054.

Pinout

The followings are the Symbol, Footprint and 3D Model of LTC4054.

Symbol

Footprint

3D Model

• Programmable Charge Current Up to 800mA

• No MOSFET, Sense Resistor or Blocking Diode Required

• Complete Linear Charger in ThinSOTTM 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

Linear Technology/Analog Devices LTC4054ES5-4.2#TRMPBF technical specifications, attributes, parameters and parts with similar specifications to Linear Technology/Analog Devices LTC4054ES5-4.2#TRMPBF.

The following figure is the LTC4054 Functional Block Diagram.

Functional Block Diagram

Standalone Li-Ion Battery Charger Circuit LTC4054

We require a specialized charger circuit with limited voltage and current for compact and tiny Li-ion batteries. Here's a basic Li-Ion Battery Charger Circuit that uses the LTC4054 to give limited and regulated output voltage, current, and temperature regulation.

The LTC4054 from analog is a single-cell Lithium-Ion battery linear charger with constant current and voltage. It only requires a few external components to function. This IC may be programmed with an external resistor and can deliver up to 800 mA of charging current.

Circuit Diagram

Components Required (BOM)

Construction & Working

This Li-ion Battery Charger is designed to charge batteries with a 4.2 V output voltage and a 600 mA output current.

C1 functions as a filter for the input power supply, and R1 acts as a program input resistor, allowing us to adjust the output current value by changing the value of R1.

The followings show the Typical Applications of LTC4054.

600mA Single Cell Li-Ion Charger

USB/Wall Adapter Power Li-Ion Charger

Full Featured Single Cell Li-Ion Charger

800mA Li-Ion Charger with External Power Dissipation

Basic Li-Ion Charger with Reverse Polarity Input Protection

• Cellular Telephones, PDAs, MP3 Players

• Charging Docks and Cradles

• Bluetooth Applications

The following shows the Package of LTC4054.

Analog Devices, Inc. (ADI), sometimes known as Analog, is an American multinational semiconductor firm based in Wilmington, Massachusetts that specializes in data conversion, signal processing, and power management technology.

Analog, mixed-signal, and digital signal processing (DSP) integrated circuits (ICs) are produced by the firm for use in electronic equipment. These technologies are used to convert, condition, and process electrical signals from real-world phenomena like light, sound, temperature, motion, and pressure.

Analog Devices serves around 100,000 clients in the communications, computer, instrumentation, military/aerospace, automotive, and consumer electronics industries.