Overview
The BQ24040DSQT, part of the BQ2404x series, is a highly integrated linear charger device designed by Texas Instruments. This component is specifically tailored for space-limited portable applications, such as TWS headsets, smartwatches, wireless speakers, and portable medical devices. It operates from either a USB port or an AC adapter, supporting a high input voltage range with input overvoltage protection, which is beneficial for using low-cost unregulated adapters. The charger features high accuracy current and voltage regulation loops, charge status display, and charge termination, making it a reliable choice for battery charging in compact devices.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Input Voltage Rating | Maximum input voltage | 30V |
| Input Overvoltage Protection | Input overvoltage protection threshold | 6.6V or 7.1V |
| Charge Voltage Accuracy | Accuracy of charge voltage regulation | 1% |
| Charge Current Accuracy | Accuracy of charge current regulation | 10% |
| Maximum Input Current Limit | Pin selectable USB input current limit | 100 mA or 500 mA |
| Battery Regulation Voltage | Battery regulation voltage at typical conditions | 4.20 V |
| Thermal Regulation | Thermal regulation temperature | 125°C |
| Thermal Shutdown Protection | Thermal shutdown protection temperature | 150°C |
| Package Type | Package type and size | 10-pin 2 × 2 mm² DFN |
Key Features
- Charging Accuracy: 1% charge voltage accuracy and 10% charge current accuracy.
- Input Current Limiting: Pin selectable USB 100 mA and 500 mA maximum input current limit.
- Programmable Termination and Precharge: Programmable termination and precharge thresholds via external resistors.
- High Voltage Chemistry Support: Supports high voltage (4.35 V) chemistry with the BQ24045 model.
- Protection Features: Includes input overvoltage protection, thermal regulation, thermal shutdown protection, and short-circuit protection.
- Automatic Termination and Timer Disable Mode (TTDM): Automatic termination and timer disable mode for absent battery pack with thermistor.
- Status Indication: Provides charging and done status indication.
- Compact Package: Available in a small 2 × 2 mm² DFN-10 package.
- Functional Safety-Capable: Functional safety-capable with documentation available to aid in system design.
Applications
- TWS Headsets and headphones
- Smartwatches and wristbands
- Wireless speakers
- Mobile POS
- Portable medical devices
Q & A
- What is the maximum input voltage rating for the BQ24040?
The maximum input voltage rating is 30V.
- What are the input overvoltage protection thresholds for the BQ24040?
The input overvoltage protection thresholds are 6.6V or 7.1V.
- How accurate is the charge voltage regulation of the BQ24040?
The charge voltage regulation accuracy is 1%.
- Can the input current limit be adjusted on the BQ24040?
- What is the thermal regulation temperature of the BQ24040?
The thermal regulation temperature is 125°C.
- Does the BQ24040 support high voltage chemistry?
The BQ24045 model supports high voltage (4.35 V) chemistry.
- What kind of protection features does the BQ24040 have?
The BQ24040 includes input overvoltage protection, thermal regulation, thermal shutdown protection, and short-circuit protection.
- How does the BQ24040 indicate charging status?
The BQ24040 provides charging and done status indication.
- In what package is the BQ24040 available?
The BQ24040 is available in a 10-pin 2 × 2 mm² DFN package.
- Is the BQ24040 functional safety-capable?
