LTC4057ES5-4.2#TRPBF

Product Overview

Category

LTC4057ES5-4.2#TRPBF belongs to the category of battery charger ICs.

Use

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

Characteristics

• Input voltage range: 4.75V to 6V
• Output voltage: 4.2V
• Charging current: up to 800mA
• Low dropout voltage: 300mV at 500mA
• Automatic recharge
• Thermal regulation and protection
• Reverse battery protection
• Small package size: SOT-23-5

Package and Quantity

The LTC4057ES5-4.2#TRPBF comes in a small SOT-23-5 package. It is available in tape and reel packaging, with a quantity of 3000 units per reel.

Specifications

• Input Voltage Range: 4.75V to 6V
• Output Voltage: 4.2V ±1%
• Charging Current: Up to 800mA
• Dropout Voltage: 300mV at 500mA
• Operating Temperature Range: -40°C to +85°C
• Package Type: SOT-23-5

Pin Configuration

The LTC4057ES5-4.2#TRPBF has the following pin configuration:

```

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

Functional Features

1. Automatic Recharge: The LTC4057ES5-4.2#TRPBF automatically restarts the charging process when the battery voltage drops below a certain threshold.
2. Thermal Regulation and Protection: This IC includes thermal regulation to prevent overheating during charging. It also provides protection against over-temperature conditions.
3. Reverse Battery Protection: The LTC4057ES5-4.2#TRPBF incorporates reverse battery protection, ensuring that the charger does not operate if the battery is connected with reversed polarity.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile use in various applications.
• High charging current capability enables faster charging times.
• Small package size makes it suitable for space-constrained designs.
• Automatic recharge feature ensures continuous battery charging.

Disadvantages

• Limited to single-cell lithium-ion/polymer battery charging applications.
• Dropout voltage may cause some power loss during charging.

Working Principles

The LTC4057ES5-4.2#TRPBF operates as a linear charger for single-cell lithium-ion/polymer batteries. It regulates the charging process by controlling the charging current and monitoring the battery voltage. The IC automatically adjusts the charging current based on the battery's state of charge and temperature. It also provides various protection features to ensure safe and reliable charging.

Detailed Application Field Plans

The LTC4057ES5-4.2#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 reliably.

Detailed Alternative Models

1. MCP73831: Similar functionality and package size, available from Microchip Technology.
2. MAX1555: Comparable features and performance, offered by Maxim Integrated.
3. BQ24075: Alternative option with similar specifications, manufactured by Texas Instruments.

These alternative models provide similar charging capabilities and can be considered as substitutes for the LTC4057ES5-4.2#TRPBF in various applications.

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