LTC4057ES5-4.2#TRMPBF

Product Overview

Category

LTC4057ES5-4.2#TRMPBF belongs to the category of integrated circuits (ICs) and specifically falls under the battery management ICs.

Use

This product is primarily used for charging single-cell lithium-ion/polymer batteries in portable electronic devices such as smartphones, tablets, digital cameras, and portable media players.

Characteristics

The LTC4057ES5-4.2#TRMPBF offers several key characteristics that make it suitable for battery charging applications. These include: - High charging efficiency - Low quiescent current - Thermal regulation for safe charging - Programmable charge current - Reverse leakage protection - Under-voltage lockout

Package

The LTC4057ES5-4.2#TRMPBF comes in a small SOT-23 package, which is widely used for surface mount applications due to its compact size and ease of handling during assembly.

Essence

The essence of this product lies in its ability to efficiently and safely charge lithium-ion/polymer batteries, ensuring optimal performance and longevity.

Packaging/Quantity

The LTC4057ES5-4.2#TRMPBF is typically available in tape and reel packaging, with 3000 units per reel.

Specifications

• Input Voltage Range: 4.35V to 6V
• Charge Voltage: 4.2V ±1%
• Maximum Charge Current: 500mA
• Quiescent Current: 35µA
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The LTC4057ES5-4.2#TRMPBF features a 5-pin SOT-23 package with the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. PROG: Charge current programming pin
4. STAT: Status output pin
5. BAT: Battery connection pin

Functional Features

The LTC4057ES5-4.2#TRMPBF offers the following functional features:

1. Programmable Charge Current: The charge current can be set using an external resistor connected to the PROG pin, allowing flexibility in charging different battery capacities.
2. Thermal Regulation: The IC incorporates thermal regulation to prevent overheating during charging, ensuring safe operation.
3. Reverse Leakage Protection: It provides protection against reverse leakage current from the battery, preventing damage to the charging circuitry.
4. Under-Voltage Lockout: The IC includes under-voltage lockout functionality to protect the battery from being charged when the input voltage is too low.

Advantages and Disadvantages

Advantages

• High charging efficiency ensures faster charging times.
• Low quiescent current minimizes power consumption when not actively charging.
• Thermal regulation prevents overheating and enhances safety.
• Reverse leakage protection safeguards the charging circuitry.
• Under-voltage lockout protects the battery from improper charging.

Disadvantages

• Limited maximum charge current of 500mA may not be suitable for high-capacity batteries or devices with fast-charging requirements.
• The SOT-23 package may pose challenges for manual soldering due to its small size.

Working Principles

The LTC4057ES5-4.2#TRMPBF operates based on a constant-current/constant-voltage (CC/CV) charging algorithm. Initially, it delivers a constant current to the battery until the voltage reaches the programmed charge voltage of 4.2V. Once reached, the IC switches to a constant-voltage mode, maintaining the voltage at 4.2V while reducing the charging current. This approach ensures efficient and safe charging of lithium-ion/polymer batteries.

Detailed Application Field Plans

The LTC4057ES5-4.2#TRMPBF finds applications in various portable electronic devices that utilize single-cell lithium-ion/polymer batteries. Some specific application fields include: - Smartphones and tablets - Digital cameras - Portable media players - Bluetooth headsets - GPS devices - Wearable devices

Detailed and Complete Alternative Models

1. MCP73831: This IC offers similar functionality and is available in a small SOT-23 package. It supports charge currents up to 500mA and provides thermal regulation for safe charging.
2. BQ24075: This integrated circuit features a higher maximum charge current of 800mA and includes additional features such as USB OTG support and battery temperature monitoring.

These alternative models can be considered based on specific requirements and design constraints.

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