BQ24055DSST

Product Overview

Category

The BQ24055DSST belongs to the category of integrated circuits (ICs) specifically designed for battery charging applications.

Use

This product is primarily used for charging lithium-ion and lithium-polymer batteries in various electronic devices such as smartphones, tablets, portable media players, and other portable electronic devices.

Characteristics

• Integrated circuit for battery charging
• Supports lithium-ion and lithium-polymer batteries
• Designed for portable electronic devices
• Compact package size
• High efficiency charging
• Overvoltage protection
• Thermal regulation

Package and Quantity

The BQ24055DSST is available in a small outline transistor (SOT) package. It is typically sold in reels or tubes containing a specified quantity of ICs, depending on the manufacturer's packaging standards.

Specifications

• Input voltage range: 4.35V - 6.45V
• Charging current: Up to 1.5A
• Charge termination voltage: 4.2V ± 1%
• Precharge current: 100mA
• Operating temperature range: -40°C to +85°C
• Standby current: < 50µA
• Battery voltage range: 3.5V - 4.5V

Pin Configuration

The BQ24055DSST has the following pin configuration:

1. VBUS: Input voltage from the USB port
2. PG: Power good indicator output
3. STAT: Charging status indicator output
4. TS: Thermistor input for thermal regulation
5. BAT: Battery connection
6. SYS: System power output
7. GND: Ground connection

Functional Features

1. Constant Current/Constant Voltage (CC/CV) Charging: The BQ24055DSST provides a CC/CV charging profile, ensuring efficient and safe charging of lithium-ion and lithium-polymer batteries.
2. Overvoltage Protection: The IC incorporates overvoltage protection to prevent damage to the battery during charging.
3. Thermal Regulation: The BQ24055DSST includes a thermistor input for thermal regulation, preventing overheating during charging.
4. Power Good Indicator: The PG pin provides an output signal indicating when the charging process is complete and the battery is ready for use.
5. Charging Status Indicator: The STAT pin provides an output signal indicating the current charging status, such as charging in progress or charging complete.

Advantages and Disadvantages

Advantages

• High charging efficiency
• Compact package size
• Overvoltage protection ensures battery safety
• Thermal regulation prevents overheating
• Clear power and charging status indicators

Disadvantages

• Limited compatibility with other battery types
• Requires external thermistor for thermal regulation

Working Principles

The BQ24055DSST operates by regulating the charging current and voltage supplied to the connected lithium-ion or lithium-polymer battery. It follows a CC/CV charging profile, where it initially supplies a constant current until the battery voltage reaches a predetermined threshold. Then, it switches to a constant voltage mode to ensure a full charge without overcharging the battery. The IC also monitors the temperature through the thermistor input to prevent overheating during the charging process.

Application Field Plans

The BQ24055DSST is widely used in various portable electronic devices that require lithium-ion or lithium-polymer battery charging capabilities. Some specific application fields include:

1. Smartphones
2. Tablets
3. Portable media players
4. Bluetooth headsets
5. Wearable devices
6. Portable gaming consoles

Alternative Models

1. BQ24070RHLR
2. MCP73831T-2ACI/OT
3. MAX1555EZK+T
4. LTC4054LES5-4.2#TRMPBF
5. TPS2511DGNR

These alternative models offer similar functionality and can be considered as replacements for the BQ24055DSST in battery charging applications.

In conclusion, the BQ24055DSST is an integrated circuit designed for efficient and safe charging of lithium-ion and lithium-polymer batteries in portable electronic devices. With its compact package size, high charging efficiency, and built-in protection features, it is a reliable choice for various battery-powered applications.