The model you mentioned, BQ24073RGTR, is a part from Texas Instruments (TI), specifically designed for battery charging and Power management purposes. It is part of the BQ24073 family of power management ICs.
Package Type
Package Type: QFN-24 (Quad Flat No-lead, 24 pins)Pin Function Specification & Circuit Principle
Let's break down the 24-pin package of the BQ24073RGTR, describing each pin’s function in detail:
Pin Function List: Pin Number Pin Name Function Description 1 BAT Battery connection pin. This is the positive terminal of the battery that connects to the battery pack. 2 GND Ground pin. Connect this pin to the system ground. 3 TS Thermal Sense pin. This pin is used for the temperature monitoring of the battery or the system. 4 CE Chip Enable pin. Active low input to enable or disable the IC's operation. When low, the IC is enab LED . 5 ISET Current Set pin. This pin is used to set the charge current for the battery. A resistor between this pin and ground sets the charging current limit. 6 ILIM Input current limit pin. This pin sets the maximum input current that the IC will draw from the adapter or USB. 7 ACOK AC Adapter OK pin. This pin signals the presence of an acceptable AC adapter voltage. It is typically used to indicate whether the adapter is valid. 8 PGOOD Power Good pin. Indicates when the voltage from the battery and input is within acceptable ranges for proper operation. 9 SYS System voltage output. Supplies power to the system from either the battery or the input voltage, depending on the source available. 10 VSTOR Storage voltage input. Voltage for the storage battery when applicable. This may be an input from a secondary source if present. 11 BATFET Battery FET Control pin. Controls the power MOSFETs that manage battery charging and discharging. 12 SENSE Current sense pin. Used to sense the current flowing into or out of the battery for charging and discharging. 13 PROG Programmable input. Used to program the behavior of the IC, such as charging rate or specific mode settings. 14 FET1 Power MOSFET control pin 1. Controls the first set of MOSFETs responsible for power path management. 15 FET2 Power MOSFET control pin 2. Controls the second set of MOSFETs responsible for power path management. 16 IN Input voltage pin. Connect to the input power source (such as USB or AC adapter). 17 INOK Input OK pin. Indicates whether the input voltage is valid for the system to draw power. 18 STAT1 Status indicator pin 1. Provides charging status information. Typically used for status LEDs or signals. 19 STAT2 Status indicator pin 2. Additional status output, often used for detailed charging condition monitoring. 20 EN1 Enable pin 1. Used for enabling certain modes of operation or functionality, such as enabling charging or standby. 21 EN2 Enable pin 2. Another enable pin for configuring charging or operational states. 22 LDO Low Drop-Out regulator output. Provides a regulated voltage output to the system, typically used to power lower-voltage devices. 23 VDD Power supply pin. Connect to the input supply for the chip. 24 VSS Ground pin. Connect to the system ground.Circuit Principle:
The BQ24073RGTR is a high-efficiency battery charger with several protection and monitoring features. It uses a buck charger topology, integrating multiple functions such as:
Battery charging (charging the battery from an adapter or USB source) Power-path management (seamless transition between adapter and battery power) Thermal regulation (ensures safe charging temperatures) Overvoltage, overcurrent, and short-circuit protection (protects the device and battery from damage) System power control (can regulate output voltage to the system depending on available power)FAQ for BQ24073RGTR (20 Common Questions):
Q: What is the main function of the BQ24073RGTR? A: The BQ24073RGTR is a power management IC designed for efficient battery charging and power-path management, providing system power from either the battery or external adapter.
Q: How do I set the charging current for the BQ24073RGTR? A: The charging current is set using a resistor between the ISET pin and ground, which configures the charge current for the battery.
Q: What does the ACOK pin indicate? A: The ACOK pin indicates whether the input AC adapter voltage is within an acceptable range for charging.
Q: What is the purpose of the BATFET pin? A: The BATFET pin controls the power MOSFETs that manage battery charging and discharging. It ensures that the battery is properly connected to the system.
Q: How do I enable or disable the IC? A: The IC can be enabled or disabled using the CE pin. A low logic level on this pin enables the IC.
Q: What is the function of the SYS pin? A: The SYS pin provides the system with power, either from the battery or the input source, depending on availability and priority.
Q: Can the BQ24073RGTR be used for lithium-ion batteries? A: Yes, the BQ24073RGTR is designed for charging lithium-ion and lithium-polymer batteries, providing voltage and current regulation.
Q: What is the input voltage range for the BQ24073RGTR? A: The input voltage range for the BQ24073RGTR is typically 4.5V to 6.5V, suitable for USB and AC adapter inputs.
Q: How is the battery temperature monitored? A: The TS pin is used to monitor the battery temperature, ensuring safe charging within the temperature limits.
Q: What does the PGOOD pin indicate? A: The PGOOD pin indicates whether the system voltage is within an acceptable range and if the charger is operating properly.
Q: How do I program the charging behavior of the IC? A: The charging behavior can be configured using the PROG pin and by selecting the appropriate components in the circuit.
Q: What does the STAT1 and STAT2 pins provide? A: The STAT1 and STAT2 pins provide status indicators of the charger, signaling the charging state, such as charging, charged, or fault conditions.
Q: How does the IC protect the battery? A: The BQ24073RGTR provides several protections, including overvoltage, overcurrent, and thermal protection, ensuring the battery is charged safely.
Q: What is the role of the SENSE pin? A: The SENSE pin monitors the current flowing in and out of the battery to ensure safe charging and discharging.
Q: Can the BQ24073RGTR charge a battery in parallel with the system load? A: Yes, the IC can charge the battery while simultaneously powering the system, providing power-path management.
Q: What is the maximum charge current of the BQ24073RGTR? A: The maximum charge current depends on the resistor selected on the ISET pin, but typically it can handle up to 3A of charging current.
Q: Is there a low dropout regulator in the BQ24073RGTR? A: Yes, the LDO pin provides a low dropout regulator output for powering low-voltage devices from the input supply.
Q: How does the BQ24073RGTR handle power failure? A: The BQ24073RGTR includes built-in features like overcurrent protection and fault handling, ensuring that power failure events do not damage the system or battery.
Q: How does the BQ24073RGTR transition between adapter and battery power? A: The power-path management feature allows seamless switching between the battery and adapter power, ensuring continuous operation.
Q: What is the significance of the EN pins? A: The EN1 and EN2 pins are used to enable specific functionality in the IC, such as enabling charge or standby modes.
This provides a detailed overview of the BQ24073RGTR. Let me know if you'd like more specific details or additional explanations!
