BQ24401PW

Product Overview

Category

BQ24401PW belongs to the category of integrated circuits (ICs) and specifically falls under the battery charger ICs.

Use

This product is primarily used for charging single-cell lithium-ion or lithium-polymer batteries. It provides a reliable and efficient charging solution for various portable electronic devices such as smartphones, tablets, and digital cameras.

Characteristics

• Input voltage range: 4.5V to 26V
• Output voltage range: 4.2V
• Maximum charge current: 1A
• Standby current: less than 0.1µA
• Temperature range: -40°C to +85°C
• Package type: PowerPAD MSOP-8
• RoHS compliant

Package and Quantity

The BQ24401PW is available in a PowerPAD MSOP-8 package. Each package contains one unit of the IC.

Specifications

• Input voltage range: 4.5V to 26V
• Output voltage: 4.2V
• Maximum charge current: 1A
• Standby current: < 0.1µA
• Charge termination current: 10% of the programmed maximum charge current
• Precharge current: 10% of the programmed maximum charge current
• Charge voltage accuracy: ±1%
• Battery temperature monitoring accuracy: ±2°C
• Overvoltage protection threshold: 4.35V
• Undervoltage lockout threshold: 3.9V
• Thermal regulation loop accuracy: ±5°C
• PowerPAD thermal resistance: 50°C/W

Detailed Pin Configuration

The BQ24401PW has eight pins arranged as follows:

1. VCC: Power supply input
2. GND: Ground reference
3. PROG: Programming pin for setting the maximum charge current
4. STAT: Status output pin indicating charging status
5. TS: Battery temperature sense input
6. BAT: Battery positive terminal connection
7. PGND: Power ground reference
8. VFB: Feedback voltage input for regulation control

Functional Features

1. Constant Current (CC) Charging: The BQ24401PW provides a constant current charging mode to ensure efficient and controlled charging of lithium-ion or lithium-polymer batteries.
2. Constant Voltage (CV) Charging: Once the battery voltage reaches the programmed threshold, the charger switches to constant voltage mode, ensuring safe and accurate charging.
3. Charge Termination: The IC terminates the charging process when the charge current drops below 10% of the programmed maximum charge current.
4. Precharge Mode: The precharge current helps condition deeply discharged batteries before entering the main charging phase.
5. Thermal Regulation: The BQ24401PW incorporates a thermal regulation loop to protect the device from overheating during operation.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows compatibility with various power sources.
• Accurate charge voltage and current control ensures safe and optimal charging.
• Low standby current minimizes power consumption when not in use.
• Compact package size enables space-efficient designs.
• RoHS compliance ensures environmental friendliness.

Disadvantages

• Maximum charge current limited to 1A, which may not be suitable for high-capacity batteries.
• Lack of built-in protection features such as overcurrent or reverse polarity protection.

Working Principles

The BQ24401PW operates based on a two-stage charging algorithm. In the first stage, it delivers a constant current to the battery until the voltage reaches the programmed threshold. Then, it switches to the second stage, providing a constant voltage to complete the charging process. The IC continuously monitors the battery temperature and adjusts the charging parameters accordingly to prevent overheating.

Detailed Application Field Plans

The BQ24401PW is widely used in various portable electronic devices, including but not limited to: - Smartphones - Tablets - Digital cameras - Portable media players - Bluetooth headsets - GPS devices

Detailed and Complete Alternative Models

1. BQ24075RGTR: Similar battery charger IC with a maximum charge current of 750mA.
2. BQ24210DGNR: Integrated circuit offering higher charge current capability (up to 2A) for faster charging.
3. LTC4054LES5-4.2: Alternative IC with a smaller package size (SOT-23) and lower standby current.

These alternative models provide options based on specific requirements and design constraints.

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