LTC4055EUF-1#TRPBF

Product Overview

Category

The LTC4055EUF-1#TRPBF belongs to the category of battery charger ICs (Integrated Circuits).

Use

This product is primarily used for charging single-cell lithium-ion/polymer batteries.

Characteristics

• The LTC4055EUF-1#TRPBF is a highly efficient, standalone linear charger with a constant-current/constant-voltage (CC/CV) charge profile.
• It is designed to work with a wide range of input sources, including USB ports, wall adapters, and other power sources.
• This charger IC offers a programmable charge current up to 1A, making it suitable for various battery capacities.
• It incorporates an automatic recharge feature that periodically recharges the battery if its voltage drops below a specified threshold.
• The device includes safety features such as thermal shutdown and reverse battery protection.

Package and Quantity

The LTC4055EUF-1#TRPBF is available in a small 4mm x 3mm DFN (Dual Flat No-Lead) package. It is supplied in tape and reel packaging, with a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 4.35V to 6V
• Charge Current Range: Up to 1A (Programmable)
• Charge Termination: Programmable C/10 or Timer
• Preconditioning: 10% of Programmed Current
• Automatic Recharge Threshold: 100mV below Regulation Voltage
• Operating Temperature Range: -40°C to 85°C

Pin Configuration

The LTC4055EUF-1#TRPBF has the following pin configuration:

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| | | LTC4055EUF-1 | | | |_______________________________________| | | | | | | | | | | | | | | | | | | | | | | | | | | | | VCC GND BAT PROG STAT NTC TS SCL SDA CE ```

• VCC: Input Supply Voltage
• GND: Ground
• BAT: Battery Connection
• PROG: Charge Current Programming Pin
• STAT: Charge Status Indicator Output
• NTC: Negative Temperature Coefficient Input
• TS: Thermal Shutdown Output
• SCL: I2C Serial Clock Input
• SDA: I2C Serial Data Input/Output
• CE: Chip Enable Input

Functional Features

1. High Efficiency: The LTC4055EUF-1#TRPBF offers high charging efficiency, minimizing power loss during the charging process.
2. Wide Input Voltage Range: It can accept input voltages ranging from 4.35V to 6V, allowing compatibility with various power sources.
3. Programmable Charge Current: The charge current can be programmed up to 1A, providing flexibility for different battery capacities.
4. Automatic Recharge: The device automatically initiates a recharge cycle if the battery voltage drops below a specified threshold, ensuring continuous operation.
5. Safety Features: The charger IC includes thermal shutdown and reverse battery protection, enhancing safety during charging.

Advantages and Disadvantages

Advantages

• High charging efficiency
• Wide input voltage range
• Programmable charge current
• Automatic recharge feature
• Safety features for protection

Disadvantages

• Limited to single-cell lithium-ion/polymer batteries
• Requires external components for complete charging circuit implementation

Working Principles

The LTC4055EUF-1#TRPBF operates based on a constant-current/constant-voltage (CC/CV) charging profile. Initially, it provides a constant current to the battery until a predefined voltage threshold is reached. Then, it switches to a constant voltage mode, maintaining the battery voltage at the specified level while reducing the charging current.

The charger IC continuously monitors the battery voltage and adjusts the charging parameters accordingly. It also incorporates safety features such as thermal shutdown and reverse battery protection to prevent damage to the battery or the charging circuit.

Detailed Application Field Plans

The LTC4055EUF-1#TRPBF finds applications in various portable electronic devices that utilize single-cell lithium-ion/polymer batteries. Some of the common application fields include:

1. Smartphones and Tablets
2. Portable Media Players
3. Bluetooth Headsets
4. Wearable Devices
5. GPS Navigation Systems
6. Digital Cameras

Detailed and Complete Alternative Models

1. MCP73831: Microchip Technology's linear charge management controller for single-cell lithium-ion/polymer batteries.
2. MAX1555: Maxim