The part you mentioned, BQ24040DSQR, is a Power Management IC manufactured by Texas Instruments. Specifically, it is a Battery Charger and Power Management IC for lithium-ion and lithium-polymer batteries. The device is commonly used in portable applications such as mobile phones, tablets, and other battery-operated devices.
Below is the detai LED information you requested regarding the BQ24040DSQR model, including its pin functions, circuit principles, and FAQ.
1. Package Type (封装类型)
The BQ24040DSQR comes in a QFN-24 package (Quad Flat No-lead package), which means it has 24 pins. The dimensions of the package are small, suitable for portable devices where size and power efficiency are crucial.
2. Pin Function List and Descriptions (引脚功能列表)
Below is a detailed breakdown of the 24 pins of the BQ24040DSQR and their corresponding functions:
Pin Number Pin Name Function Description 1 REGN Regulator Output: Provides the output voltage for the internal circuitry. 2 STAT1 Status LED 1: Used to indicate the charging status (e.g., charging, full). 3 STAT2 Status LED 2: Used to indicate the charging status (e.g., fault, thermal shutdown). 4 IN Input Voltage: The input voltage used to charge the battery (typically USB or AC adapter). 5 ISET Current Sense Resistor: Sets the charge current by using an external resistor. 6 VSTOR Battery Voltage Input: Connected to the battery for charging and monitoring purposes. 7 GND Ground: Common return for the power supply and circuits. 8 TS Temperature Sense: Used to monitor the temperature of the battery for thermal protection. 9 PROG Program Pin: Used to set the precharge current limit with an external resistor. 10 CHGIN Charge Input: Used to monitor the input charge voltage. 11 VOUT Output Voltage: The regulated output voltage to power the device or charge the battery. 12 CE Chip Enable: Active high to enable the device. 13 NTC Negative Temperature Coefficient Pin: Connects to an NTC thermistor for battery temperature monitoring. 14 DPM Dynamic Power Management: Reduces charge current if the input power is insufficient. 15 BATSNS Battery Voltage Monitor: Monitors battery voltage for safety and regulation. 16 I2C_SCL I2C Clock : Communication line for I2C interface . 17 I2C_SDA I2C Data: Communication line for I2C interface. 18 VCC Power Supply Pin: Supplies power to the IC from the external source. 19 SHDN Shutdown Pin: Used to turn off the device, reducing power consumption. 20 SYS System Output: Provides system power from the battery when charging is not required. 21 CS Charge Current Sense: Monitors the charging current flowing into the battery. 22 OC Overcurrent Protection: Used for protection against excessive current draw. 23 SENSE Voltage Sense: Used to monitor voltage across the battery and provide feedback. 24 PGND Power Ground: Power return for the IC, connected to the system ground.3. Principle of Operation (电路原理说明)
The BQ24040DSQR operates as a battery charger and system power management IC. The IC can charge a battery from a USB or AC adapter and regulate the output voltage to power external devices. The chip incorporates several features such as:
Battery Charging: Supports precharge, fast charge, and charge termination modes. Power Path Management: Ensures that the device can switch seamlessly between charging and system power supply. Thermal Protection: Monitors the temperature of the battery and prevents overheating. Current Regulation : Maintains a safe charging current with an external resistor. I2C Communication: Allows remote monitoring and configuration of charging parameters.The system can dynamically adjust the charge current based on available input power, ensuring maximum efficiency and safety.
4. Frequently Asked Questions (FAQ) (20个常见问题)
Below is a list of common questions and their detailed answers for the BQ24040DSQR model.
Q: What is the maximum charging current supported by the BQ24040DSQR? A: The maximum charging current is programmable via an external resistor connected to the ISET pin. Typically, it can handle up to 2.5A. Q: How does the BQ24040DSQR handle temperature protection? A: The TS pin is used for temperature sensing, and if the battery temperature exceeds safe limits, the charging will be suspended to prevent overheating. Q: What happens if the input voltage is below the required level? A: If the input voltage is too low, the charger will stop charging the battery and indicate a fault condition via the STAT2 pin. Q: How is the charge status displayed? A: The STAT1 and STAT2 pins are connected to LEDs that display the charging status (e.g., charging, full, or fault). Q: What is the function of the DPM pin? A: The DPM pin is used for Dynamic Power Management. It adjusts the charging current when the input power is insufficient. Q: Can I use the BQ24040DSQR with a 5V USB input? A: Yes, the IC is designed to work with 5V USB inputs, but the input voltage should not exceed the maximum allowed value of 6.5V. Q: How does the BQ24040DSQR ensure safe charging of the battery? A: The IC uses various protections such as current limiting, thermal shutdown, and voltage regulation to ensure safe battery charging. Q: What is the role of the PROG pin? A: The PROG pin sets the precharge current limit using an external resistor to ensure safe charging of deeply discharged batteries. Q: How do I disable the device? A: The chip can be disabled by applying a low signal to the CE (chip enable) pin.Q: What is the typical application for the BQ24040DSQR?
A: This IC is typically used in portable devices that require efficient battery charging and power management, such as smartphones and tablets.Q: What is the maximum battery voltage that the BQ24040DSQR can handle?
A: The IC can handle battery voltages up to 4.2V for lithium-based batteries.Q: How does the system switch between input and battery power?
A: The BQ24040DSQR uses Power Path Management to switch between input power and battery power based on availability.Q: What happens if the battery voltage falls too low?
A: If the battery voltage falls too low, the device enters a precharge mode to safely charge the battery.Q: Can I charge two batteries in parallel with the BQ24040DSQR?
A: It is recommended to use a single battery per charger to avoid imbalances, as the IC is designed for single-cell operation.Q: Can I use the I2C interface for monitoring the charging status?
A: Yes, the I2C interface allows you to monitor and configure the charging parameters, such as current limits and status flags.Q: How do I set the charge current limit?
A: The charge current limit is set by an external resistor connected to the ISET pin.Q: What is the maximum input voltage for the BQ24040DSQR?
A: The maximum input voltage is 6.5V. Exceeding this can damage the IC.Q: Can the BQ24040DSQR charge batteries while the system is running?
A: Yes, the IC can charge the battery while powering the system, providing seamless power management.Q: What is the function of the CS pin?
A: The CS pin monitors the charging current and provides feedback to the system for overcurrent protection.Q: What are the benefits of using the BQ24040DSQR in my device?
A: The BQ24040DSQR offers efficient battery charging, power path management, thermal and overcurrent protection, and I2C-based monitoring, making it ideal for portable devices.This concludes the detailed specifications, pin functions, and FAQs for the BQ24040DSQR model.