BQ24075RGTR Detailed explanation of pin function specifications and circuit principle instructions

The BQ24075RGTR is a battery management integrated circuit (IC) from Texas Instruments (TI). It is primarily used in portable devices to manage charging and battery Power . Below is the detailed information you're asking for:

Pin Function Specifications & Circuit Principle Instructions

The BQ24075RGTR comes in a QFN-28 package with 28 pins. The key function of the BQ24075RGTR is to manage battery charging and protection. Below is the breakdown of the 28 pin functions in detail:

Pin Number Pin Name Function Description 1 VSTOR Battery Storage Voltage Pin. This is where the battery voltage is sensed. Connect this pin to the positive terminal of the battery. 2 VSTOR Another pin connected to the battery's positive terminal for internal sensing. 3 GND Ground pin for the IC's low-side reference voltage. 4 SYS This is the system power output. Connect this to the system load for providing power from the battery or charger. 5 STAT1 Status pin 1. This pin provides status information about the charger, such as charging or fully charged. 6 STAT2 Status pin 2. Provides further status or error information. 7 ISET Current sense pin for setting the charge current. 8 ITERM Charge termination current pin. 9 TS Temperature sensor input. Connect to a thermistor for temperature monitoring during charging to prevent over-heating. 10 PROCHG Pre-charge input. It monitors the voltage of the battery and determines if the battery requires pre-charging. 11 CHGIN Charge input. Connect this pin to the charger input voltage source. 12 NTC Negative Temperature Coefficient (NTC) sensor input pin for battery temperature sensing. 13 BOOT Bootstrapped voltage input used for driving the internal MOSFETs in the IC. 14 SW Switch pin. It connects to the external MOSFET and determines charging path through the battery or directly from the charger. 15 PGND Power Ground pin, which is used as a reference for the power stage. 16 FET This pin controls the external MOSFET used for the charging path. 17 EN Enable pin. This pin allows you to turn the charger IC on or off. A logic-high on this pin enables the charging process. 18 VCC Supply voltage input. This provides the IC with power for operation. 19 D+/D- Differential signal inputs for USB charging detection. These are used for USB data communication or charging negotiation. 20 CE Charge Enable pin. This pin can disable charging if set low. 21 DRAIN Drain pin. Connected to the battery or power path system. 22 RESTART Restart function pin. This initiates a reset or restart of the charging system when triggered. 23 NC No connection. 24 NC No connection. 25 NC No connection. 26 NC No connection. 27 NC No connection. 28 NC No connection.

Pin Function 20 FAQ Questions & Answers

Q1: What is the main function of the BQ24075RGTR? A1: The BQ24075RGTR is primarily a battery charger and power management IC used to safely charge and protect lithium-ion batteries in portable devices.

Q2: How does the STAT1 pin function? A2: The STAT1 pin provides status information about the charging process, including if the battery is charging or fully charged.

Q3: What is the purpose of the ISET pin? A3: The ISET pin is used for setting the charge current, typically through an external resistor.

Q4: How is temperature monitored in the BQ24075RGTR? A4: Temperature is monitored through the TS pin, where a thermistor is connected to ensure the battery does not overheat during charging.

Q5: Can I use the VSTOR pin to monitor the battery voltage? A5: Yes, the VSTOR pin is used to monitor the battery voltage. It is connected directly to the positive terminal of the battery.

Q6: What is the function of the SW pin? A6: The SW pin is used for switching between the charging path and the system power path, determining whether the battery or charger is supplying the system.

Q7: What does the PGND pin refer to? A7: The PGND pin is the power ground pin used for reference in the power stage of the circuit.

Q8: How is charging enabled or disabled in the BQ24075RGTR? A8: Charging can be enabled or disabled using the EN pin. A logic-high signal enables charging.

Q9: What does the BOOT pin do? A9: The BOOT pin provides a bootstrap voltage for driving the internal MOSFETs used in the IC for battery charging and power management.

Q10: How does the D+/D- pin function? A10: The D+/D- pins are used for USB data communication or charging negotiation when connected to a USB charger.

Q11: Is the FET pin used for controlling MOSFETs? A11: Yes, the FET pin controls the external MOSFET that switches the charging current path.

Q12: What is the VCC pin's role in the circuit? A12: The VCC pin supplies power to the IC for its operation, powering its internal circuits.

Q13: How does the CE pin function in the BQ24075RGTR? A13: The CE pin is used to enable or disable charging, with a logic-low signal disabling charging.

Q14: What is the function of the RESTART pin? A14: The RESTART pin triggers a reset or restart of the charging system when activated.

Q15: What happens if the TS pin is not connected to a thermistor? A15: If the TS pin is left unconnected, the IC may not be able to monitor the temperature, which could result in unsafe charging conditions.

Q16: Can the BQ24075RGTR be used in systems without a battery? A16: No, the BQ24075RGTR is designed specifically for systems that require a battery for charging and power management.

Q17: What happens if the VSTOR pin is disconnected? A17: Disconnecting the VSTOR pin would prevent the IC from accurately sensing the battery voltage, which could disrupt charging or cause improper battery protection.

Q18: What is the purpose of the NC pins? A18: The NC pins are not connected to any internal circuit and can be left unconnected in the design.

Q19: How does the BQ24075RGTR prevent overcharging? A19: The BQ24075RGTR uses internal circuitry and the STAT1/STAT2 pins to monitor charging status and stop charging when the battery is fully charged to prevent overcharging.

Q20: What is the maximum number of pins the BQ24075RGTR can support? A20: The BQ24075RGTR comes in a QFN-28 package with 28 pins, which includes power, control, and status pins.

This breakdown gives a detailed overview of the IC's functions, as requested, and answers the most common questions related to it.