BQ24018DRCT - English Editing Encyclopedia Entry

Product Overview

Category

The BQ24018DRCT belongs to the category of integrated circuits (ICs) and specifically falls under the power management ICs.

Use

This product is primarily used for managing and controlling the charging of lithium-ion or lithium-polymer batteries in portable electronic devices such as smartphones, tablets, and wearable devices.

Characteristics

• The BQ24018DRCT is a highly efficient battery charger that supports single-cell Li-Ion and Li-Polymer batteries.
• It offers a wide input voltage range, making it suitable for various power sources.
• This IC provides accurate charge termination and conditioning for optimal battery performance.
• It incorporates multiple safety features to protect the battery and the device from overcharging, overvoltage, and overcurrent conditions.

Package and Quantity

The BQ24018DRCT is available in a small outline package (SOP) with 10 pins. It is typically sold in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Input Voltage Range: 4.35V to 6.45V
• Charging Current: Up to 1.5A
• Charge Termination: Programmable
• Preconditioning: Yes
• Battery Temperature Monitoring: Yes
• Safety Features: Overvoltage Protection, Overcurrent Protection, Thermal Shutdown

Pin Configuration

The BQ24018DRCT has the following pin configuration:

1. VBUS: Input voltage from the USB port or external power source.
2. PG: Power Good output indicating the presence of a valid input voltage.
3. STAT: Status output indicating the charging status.
4. TS: Battery temperature sense input.
5. BAT: Battery positive terminal connection.
6. SYS: System output voltage.
7. GND: Ground reference.
8. ISET: Charging current programming input.
9. PROG: Charge termination and preconditioning programming input.
10. TS/NTC: Battery temperature sense or NTC thermistor connection.

Functional Features

• Integrated power FETs for efficient charging.
• Automatic power source detection (USB or adapter).
• Programmable charge termination and preconditioning.
• Thermal regulation to prevent overheating.
• Dynamic power management for optimal charging efficiency.
• Status indication through the STAT pin.

Advantages and Disadvantages

Advantages

• High charging efficiency ensures faster battery charging.
• Wide input voltage range allows compatibility with various power sources.
• Multiple safety features protect the battery and device from damage.
• Programmable charge termination and preconditioning enhance battery performance.
• Small package size enables space-saving designs in portable devices.

Disadvantages

• Limited charging current of up to 1.5A may not be suitable for high-capacity batteries.
• Lack of built-in communication protocols like USB Power Delivery limits compatibility with advanced charging systems.

Working Principles

The BQ24018DRCT operates by regulating the charging current and voltage supplied to the connected lithium-ion or lithium-polymer battery. It uses a combination of power FETs, control circuitry, and sensing mechanisms to ensure safe and efficient charging. The IC monitors the battery voltage, temperature, and charging status to adjust the charging parameters accordingly. It terminates the charging process when the battery reaches the desired voltage level, preventing overcharging and potential damage.

Application Field Plans

The BQ24018DRCT is widely used in various portable electronic devices that require efficient and reliable battery charging. Some application fields where this IC finds extensive usage include:

1. Smartphones and Tablets: Ensures fast and safe charging for mobile devices.
2. Wearable Devices: Powers smartwatches, fitness trackers, and other wearable gadgets.
3. Portable Gaming Consoles: Provides optimized charging for gaming devices on the go.
4. Bluetooth Headsets and Earphones: Enables quick charging of wireless audio accessories.
5. Portable Medical Devices: Supports battery charging in medical equipment like portable monitors and diagnostic devices.

Alternative Models

For users seeking alternative options, the following models provide similar functionality to the BQ24018DRCT:

1. MCP73831: Microchip Technology's single-cell Li-Ion/Li-Polymer charge management controller.
2. MAX1555: Maxim Integrated's highly integrated battery charger for single-cell Li-Ion batteries.
3. LTC4054: Linear Technology's standalone linear charger for single-cell Li-Ion batteries.

These alternatives offer comparable features and can be considered based on specific application requirements.

In conclusion, the BQ24018DRCT is a versatile power management IC designed for efficient charging of lithium-ion and lithium-polymer batteries in portable electronic devices. Its wide input voltage range, safety features, and programmable charging parameters make it an ideal choice for various applications.

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