LTC4054LES5-4.2#TRPBF

Product Overview

Category

The LTC4054LES5-4.2#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

• Input Voltage Range: 4.75V to 6V
• Charge Current: Up to 800mA
• Programmable Charge Current Limit
• Automatic Recharge
• Undervoltage Lockout
• Thermal Regulation
• Status Indication
• Small Package Size: SOT-23-5

Package and Quantity

The LTC4054LES5-4.2#TRPBF is available in a small SOT-23-5 package. It is typically sold in reels or tubes, with a quantity of 3000 units per reel.

Specifications

• Input Voltage Range: 4.75V to 6V
• Charge Voltage: 4.2V
• Charge Current: Up to 800mA
• Charge Termination: C/10
• Preconditioning: 10% of Full-Scale Current
• Operating Temperature Range: -40°C to +85°C
• Shutdown Current: <1µA
• Reverse Battery Protection: Yes
• Battery Temperature Monitoring: Yes

Pin Configuration

The LTC4054LES5-4.2#TRPBF has five pins arranged as follows:

```

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| | --| VBAT | --| GND | --| PROG | --| STAT | --| VIN | |___________| ```

• VBAT: Battery Connection
• GND: Ground
• PROG: Charge Current Programming Pin
• STAT: Status Indicator Output
• VIN: Input Voltage

Functional Features

1. Programmable Charge Current: The PROG pin allows the charge current to be programmed according to the application requirements.
2. Automatic Recharge: The LTC4054LES5-4.2#TRPBF automatically restarts the charging process if the battery voltage falls below a certain threshold.
3. Undervoltage Lockout: This feature prevents charging when the input voltage is below a specified level, ensuring safe operation.
4. Thermal Regulation: The IC regulates the charge current to prevent excessive heat generation during charging, enhancing safety and reliability.
5. Status Indication: The STAT pin provides an output signal indicating the charging status, enabling easy monitoring of the charging process.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows compatibility with various power sources.
• Programmable charge current enables flexibility in charging different battery capacities.
• Automatic recharge feature ensures continuous charging without manual intervention.
• Small package size makes it suitable for space-constrained applications.
• Undervoltage lockout enhances safety by preventing charging at low input voltages.

Disadvantages

• Limited to single-cell lithium-ion/polymer battery charging applications.
• Not suitable for high-current charging requirements.

Working Principles

The LTC4054LES5-4.2#TRPBF operates as a linear charger for single-cell lithium-ion/polymer batteries. It utilizes a constant-current/constant-voltage (CC/CV) charging algorithm. Initially, it charges the battery with a constant current until the battery voltage reaches the programmed charge voltage (4.2V). Once the battery voltage reaches this level, the charger switches to a constant-voltage mode, maintaining the voltage at 4.2V while reducing the charge current. This ensures a complete and safe charging process.

Detailed Application Field Plans

The LTC4054LES5-4.2#TRPBF is commonly used in portable electronic devices, such as smartphones, tablets, digital cameras, and portable media players. It is also suitable for applications where a single-cell lithium-ion/polymer battery needs to be charged efficiently and safely.

Detailed Alternative Models

1. MCP73831: This IC offers similar functionality and features as the LTC4054LES5-4.2#TRPBF, with a slightly different pin configuration.
2. MAX1555: Another alternative with comparable specifications and performance, providing flexibility in charging single-cell lithium-ion/polymer batteries.

In conclusion, the LTC4054LES5-4.2#TRPBF is a versatile battery charger IC designed for single-cell lithium-ion/polymer batteries. Its programmable charge current, automatic recharge, and small package size make it suitable for various portable electronic devices. While it has limitations in terms of application scope and high-current charging, it offers reliable and efficient charging solutions for many consumer electronics.