Overview
The Texas Instruments BQ24450DW is a standalone integrated battery charge controller specifically designed for valve-regulated lead-acid batteries. This IC contains all the necessary circuitry to optimally control the charging process, ensuring safe and efficient charging that maximizes battery capacity and life. The BQ24450DW can be configured as a simple constant-voltage float charge controller or a dual-voltage float-cum-boost charge controller, making it versatile for various applications. It features a precision temperature-compensated reference voltage that tracks the characteristics of lead-acid cells, maintaining optimum charging voltage over an extended temperature range without the need for external components.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (DW) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 70 | °C |
| Supply Voltage Range | 5 to 40 | V |
| Junction Temperature Range | -40 to 150 | °C |
| Storage Temperature Range | -65 to 150 | °C |
| Input Current (ISNS) | 80 mA | - |
| Output Current (DRVC, DRVE) | 80 mA, -80 mA | - |
| Power Dissipation at TA = 25°C | 1000 mW | - |
Key Features
- Regulates both voltage and current during charging to ensure safe and efficient battery charging.
- Precision temperature-compensated reference voltage to maximize battery capacity over temperature.
- Supports different configurations, including constant-voltage float and dual-voltage float-cum-boost charge controllers.
- Minimum external components required, simplifying the design and reducing component count.
- Available in a 16-pin SOIC (DW) package.
- Low current consumption to minimize self-heating effects and ensure accurate temperature monitoring.
- Versatile driver for external pass transistor supports both NPN and PNP types and provides at least 25mA of base drive.
- Comparators to monitor charging voltage and current, with status signals available at external pins.
Applications
- Emergency Lighting Systems
- Security and Alarm Systems
- Telecommunication Backup Power
- Uninterruptible Power Supplies (UPS)
Q & A
- What type of batteries does the BQ24450DW support?
The BQ24450DW is designed for valve-regulated lead-acid batteries.
- What are the key configurations supported by the BQ24450DW?
The IC can be configured as a simple constant-voltage float charge controller or a dual-voltage float-cum-boost charge controller.
- What is the significance of the precision temperature-compensated reference voltage?
The precision temperature-compensated reference voltage ensures that the charging voltage tracks the characteristics of lead-acid cells over an extended temperature range, maximizing battery capacity and life.
- What is the operating temperature range of the BQ24450DW?
The operating temperature range is -40°C to 70°C.
- What is the supply voltage range for the BQ24450DW?
The supply voltage range is 5V to 40V.
- How does the BQ24450DW handle deeply discharged batteries?
The IC can be configured to pre-charge the battery until its voltage rises to a safe level, using the PRE-CHG pin to source current.
- What types of external pass transistors does the BQ24450DW support?
The IC supports both NPN and PNP external pass transistors, providing at least 25mA of base drive.
- What are the status signals provided by the BQ24450DW?
The IC provides status signals at external pins (STAT1, STAT2, PGOOD) to indicate the charging status and other conditions.
- How does the BQ24450DW minimize self-heating effects?
The IC operates with low current consumption, minimizing on-chip dissipation and self-heating effects, which allows for accurate temperature monitoring.
- What are some common applications of the BQ24450DW?
Common applications include emergency lighting systems, security and alarm systems, telecommunication backup power, and uninterruptible power supplies (UPS)).
