Overview
The BQ21040DBVT is a highly integrated single-cell Li-Ion and Li-Polymer battery charger IC manufactured by Texas Instruments. This device is designed for space-constrained portable applications and supports battery charging with a low number of external components. It operates from either a USB port or an AC adapter and features high accuracy current and voltage regulation to safely charge batteries.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5V to 6.5V | V |
| Battery Charge Voltage | 4.2V (±1%) | V |
| Battery Charge Current | Up to 800 mA | mA |
| Precharge Current | 10% of fast charge current | % |
| Operating Temperature Range | -40°C to +125°C | °C |
| Package Type | SOT-23 (DBV)-6 | |
| Maximum Input Voltage | 6.5V | V |
| Thermal Regulation | 125°C Thermal Regulation; 150°C Thermal Shutdown | °C |
Key Features
- Automatic Battery Charging States: Manages precharge, fast-charge, and termination modes for optimal battery health.
- Thermal Regulation: Reduces charge current when high temperatures are detected to prevent overheating.
- Preconditioning for Deeply Discharged Batteries: Provides gentle charging for depleted batteries to enhance longevity.
- Battery Voltage Regulation: Provides precise regulation to safely reach the 4.2V full charge.
- Charge Termination: Automatically stops charging when the battery is fully charged, preventing overcharging.
- Low-Power Mode: Minimizes power consumption when charging is complete or the battery is not connected.
- Flexible Charge Current Setting: Customizable charging current via an external resistor.
- RoHS Compliant: Environmentally friendly, free from hazardous substances.
Applications
- Wearable Devices: Ideal for wearables such as fitness trackers and smart bands where battery space and thermal management are critical.
- Health Monitoring Devices: Suitable for health monitoring applications like pulse oximeters and portable ECG monitors, ensuring safe and efficient battery charging.
- Portable Consumer Electronics: Used in wireless earbuds, handheld gaming devices, and mini speakers where small size and power efficiency are essential.
- IoT Devices and Sensors: Well-suited for IoT devices and sensors that operate on rechargeable batteries, providing consistent charging and protection from overcharging and high temperatures.
- Industrial and Medical Equipment: Used in compact, portable industrial equipment and medical devices where reliable battery management is critical.
Q & A
- What is the BQ21040DBVT? The BQ21040DBVT is a highly integrated single-cell Li-Ion and Li-Polymer battery charger IC manufactured by Texas Instruments.
- What is the input voltage range of the BQ21040DBVT? The input voltage range is 4.5V to 6.5V.
- What is the maximum charge current of the BQ21040DBVT? The maximum charge current is up to 800 mA.
- How does the BQ21040DBVT manage battery charging? It manages precharge, fast-charge, and termination modes automatically for optimal battery health.
- What are the thermal protection features of the BQ21040DBVT? It reduces charge current when high temperatures are detected and has a thermal shutdown at 150°C.
- What package type is the BQ21040DBVT available in? It is available in a SOT-23 (DBV)-6 package.
- Is the BQ21040DBVT RoHS compliant? Yes, it is RoHS compliant.
- What are some typical applications of the BQ21040DBVT? It is used in wearable devices, health monitoring devices, portable consumer electronics, IoT devices, and industrial and medical equipment.
- How does the BQ21040DBVT compare to the BQ24040? The BQ21040DBVT supports up to 800 mA charge current with temperature sensing, while the BQ24040 supports up to 1A without temperature sensing.
- What is the purpose of the TS pin in the BQ21040DBVT? The TS pin monitors battery temperature and disables charging if the temperature is out of the safe range.
