BQ24133RGYR Detailed explanation of pin function specifications and circuit principle instructions

The BQ24133RGYR is a part of the BQ24133 family of battery management ICs manufactured by Texas Instruments (TI). It is used primarily for charging and Power management in portable devices.

The BQ24133 IC comes in the QFN-32 (Quad Flat No-lead) package. This package has 32 pins, each of which has specific functions for managing various power and charging tasks, such as voltage regulation, current monitoring, thermal protection, and more.

Pin Function Description for BQ24133RGYR (QFN-32 Package)

Here’s a detailed explanation of each pin in the QFN-32 package:

Pin Number Pin Name Function Description 1 PSEL Power source selection input. Used to select between USB, AC adapter, or other power inputs. 2 TS Temperature sensing input for external thermistor. Protects the battery from overheating. 3 GND Ground pin for the IC. 4 VSTOR Input voltage for the storage battery. Connects to the battery's positive terminal. 5 SYS System voltage output for connecting to the load or system. Provides the regulated voltage to the device. 6 ISET Set charge current. Used to configure the charging current. 7 BAT Battery voltage sensing input. Monitors the battery voltage level for proper charging and protection. 8 PGND Power ground for the charging circuitry. 9 CHRG Charge status output. Indicates the charging status (charging, complete, or fault). 10 REGN Internal regulator ground pin. 11 VDD Input voltage for the internal logic and regulator circuits. 12 FET FET control input, used for turning the external MOSFETs on/off in power management applications. 13 A2 Additional input/output for configuration or feedback depending on application. 14 A1 Additional input/output for configuration or feedback depending on application. 15 F1 Feedback pin for the charging circuit, helps maintain proper charge regulation. 16 F2 Feedback pin for the charging circuit, helps maintain proper charge regulation. 17 PGOOD Power Good status output. Indicates whether the power input is stable and within required specifications. 18 ILIM Input current limit pin. Used to set the maximum input current limit for the power source. 19 VSTBY Standby input voltage for the IC. Used to set a low power mode when the device is not in use. 20 ON/OFF Input pin used to turn the IC on or off. 21 OVLO Over-voltage lockout input. Protects against over-voltage situations by disabling the charging path when necessary. 22 C2 Capacitor connection for internal filtering or stabilization. 23 C1 Capacitor connection for internal filtering or stabilization. 24 NTX Output for the charging current regulation. Used to control the current to the battery based on feedback. 25 NTXGND Ground for the current regulation loop. 26 VCC Supply voltage pin for the internal logic circuits. 27 TSD Thermal shutdown protection. Pin for monitoring the IC’s internal temperature and triggering shutdown if necessary. 28 NC No connection pin. 29 FB Voltage feedback input used for monitoring the battery voltage. 30 CC Charge control input pin, used for controlling charge behavior. 31 VREGEN Voltage regulator enable pin. Used to enable or disable the internal voltage regulator. 32 TSENSE Battery temperature sense input used for temperature monitoring.

20 Frequently Asked Questions (FAQ) for the BQ24133RGYR

1. What is the primary function of the BQ24133RGYR?

Answer: The BQ24133RGYR is primarily used for managing the charging and power distribution to lithium-ion or lithium-polymer batteries in portable devices. It handles charging, power path management, and provides protections like over-voltage and thermal shutdown.

2. How does the BQ24133RGYR manage charging current?

Answer: The charging current is set by adjusting the ISET pin, which determines the maximum charging current for the connected battery.

3. What does the PGOOD pin indicate?

Answer: The PGOOD pin indicates whether the power input is stable and within the required voltage range for proper charging operation.

4. Can the BQ24133RGYR protect the battery from over-temperature conditions?

Answer: Yes, the TS (Temperature Sense) pin monitors the battery temperature, and if it exceeds a predefined threshold, the IC can stop charging to prevent overheating.

5. How is the BAT pin used in the system?

Answer: The BAT pin monitors the battery voltage. It helps the IC determine when to start or stop charging the battery and ensures the battery is charged safely.

6. What is the role of the FET pin?

Answer: The FET pin controls external MOSFETs that regulate the flow of current between the power source and the battery or system.

7. How does the BQ24133RGYR handle input power?

Answer: The PSEL pin allows you to select the appropriate power source, such as a USB or an AC adapter, to supply power to the system.

8. What protection features are available in the BQ24133RGYR?

Answer: The IC provides protections such as over-voltage lockout (OVLO), thermal shutdown (TSD), and input current limiting, which prevent damage to the battery and circuit.

9. What is the function of the ON/OFF pin?

Answer: The ON/OFF pin is used to turn the BQ24133RGYR on or off, controlling the overall power of the IC.

10. What is the significance of the VSTBY pin?

Answer: The VSTBY pin sets the standby mode for the IC, allowing it to consume minimal power when not actively charging or in use.

11. Can the BQ24133RGYR support multiple power sources?

Answer: Yes, the PSEL pin allows for selecting between multiple power sources, including USB, AC adapters, or other input sources.

12. How is the OVLO pin used?

Answer: The OVLO pin is used to protect the system from over-voltage conditions. If the input voltage exceeds the set threshold, it disables the charging process to avoid damage.

13. What role does the TSENSE pin play in the IC?

Answer: The TSENSE pin connects to a thermistor that monitors the battery’s temperature, helping to prevent overheating by controlling the charging process.

14. What happens if the F1 or F2 pins are not correctly configured?

Answer: The F1 and F2 pins are feedback pins for the charging circuit. Incorrect configuration can lead to improper charging regulation and potential damage to the battery or IC.

15. How does the BQ24133RGYR monitor the battery voltage?

Answer: The FB pin is used to monitor the battery voltage by providing feedback to the charging circuitry to ensure proper voltage regulation during the charging process.

16. Can the ISET pin adjust the input current limit?

Answer: No, the ISET pin only sets the charging current limit for the battery, not the input current limit. The input current limit is controlled by the ILIM pin.

17. How can I ensure the system remains safe during charging?

Answer: By utilizing the TSD pin for thermal shutdown and the TS pin for temperature sensing, the system will automatically protect the battery from overheating.

18. Can the REGN pin affect the IC's performance?

Answer: Yes, the REGN pin is important for the internal voltage regulator’s ground connection. Improper connection can affect the IC’s voltage regulation performance.

19. How can I customize the charging behavior of the BQ24133RGYR?

Answer: You can customize charging behavior through various configuration pins, such as ISET for charge current, PSEL for power source selection, and VSTBY for standby settings.

20. What do the A1 and A2 pins do?

Answer: The A1 and A2 pins are additional inputs or outputs that can be used for configuration or feedback, depending on the application.

This comprehensive description provides you with a clear and detailed understanding of the BQ24133RGYR’s pin functions, features, and operational characteristics. Let me know if you need any additional clarifications or details!