MCP73832T-2ACI-OT Detailed explanation of pin function specifications and circuit principle instructions

The MCP73832T-2ACI/OT is a product from Microchip Technology, specifically a lithium-ion (Li-ion) and lithium-polymer (LiPo) battery charge management controller. This part is designed to charge single-cell Li-ion or LiPo batteries in applications like portable electronics, wireless systems, and more. The "T" in the model number indicates that it is offered in a small SOT-23 package.

Here’s a detailed breakdown of the pinout, functions, and general usage instructions of the MCP73832T-2ACI/OT in tabular format:

MCP73832T-2ACI/OT Pinout and Functionality

Pin Number Pin Name Pin Function Description 1 VDD Power supply input pin. Connect to the power source for charging (typically 5V from USB or a wall adapter). 2 VSS Ground reference pin. Connect to the system ground. 3 PROG Programming pin for setting the charge current. A resistor is typically connected to this pin to set the current. 4 STAT1 Status indicator 1 pin. Provides the charging status information (charging, charged, or error). 5 STAT2 Status indicator 2 pin. Used for providing additional charge status (like temperature or fault conditions). 6 TEMP Temperature sensing pin. Monitors the temperature of the battery during charging to prevent overheating. 7 BAT Battery connection pin. Connects to the positive terminal of the battery being charged. 8 EN Enable pin for starting and stopping the charging process. A logic high enables charging, a logic low disables it.

Pin Package and Description

The MCP73832T-2ACI/OT is offered in an 8-pin SOT-23 package. The SOT-23 package is small and suitable for compact applications like handheld devices, smart wearables, and battery-powered equipment.

20 Common FAQ About the MCP73832T-2ACI/OT

1. What is the MCP73832T-2ACI/OT used for?

The MCP73832T-2ACI/OT is used for charging single-cell lithium-ion (Li-ion) or lithium-polymer (LiPo) batteries.

2. What is the maximum input voltage for the MCP73832T-2ACI/OT?

The MCP73832T-2ACI/OT can tolerate an input voltage of up to 6V.

3. How does the PROG pin set the charging current?

The PROG pin is connected to an external resistor, and the value of this resistor determines the charging current.

4. Can I use MCP73832T-2ACI/OT for multi-cell batteries?

No, this part is designed specifically for single-cell batteries.

5. How does the STAT1 pin indicate the charging status?

The STAT1 pin indicates whether the battery is charging, fully charged, or in an error state using different output voltage levels.

6. What should be connected to the TEMP pin?

The TEMP pin should be connected to a thermistor to monitor the temperature of the battery and prevent overheating during charging.

7. What is the role of the BAT pin?

The BAT pin connects directly to the battery's positive terminal to manage charging.

8. Can the charging process be disabled using the EN pin?

Yes, pulling the EN pin low will disable the charging process, and pulling it high will enable charging.

9. How does the MCP73832T-2ACI/OT protect against overcharging?

The chip has built-in overvoltage protection that stops charging when the battery voltage reaches a preset threshold.

10. Is there any short-circuit protection?

Yes, the MCP73832T-2ACI/OT includes short-circuit protection to prevent damage during improper connections.

11. Can the MCP73832T-2ACI/OT be used in USB-powered applications?

Yes, it works well in USB-powered applications, with an input voltage range that includes typical USB 5V.

12. How is battery capacity managed?

The chip automatically adjusts the charging process based on the battery's charge state, ensuring that it charges in a safe, controlled manner.

13. Can the MCP73832T-2ACI/OT charge a battery faster than a conventional charger?

The charging speed depends on the value of the resistor connected to the PROG pin, which sets the current. The charging current can be optimized based on the resistor value.

14. What happens if the battery is too hot?

If the temperature exceeds a predefined limit, the TEMP pin will signal, and the chip will stop charging to protect the battery.

15. Is the MCP73832T-2ACI/OT suitable for wearables?

Yes, the small SOT-23 package and its charging functionality make it ideal for use in wearables and portable devices.

16. What is the typical charge rate for the MCP73832T-2ACI/OT?

The charge rate depends on the resistor connected to the PROG pin but is typically between 50mA and 500mA for most applications.

17. How does the STAT2 pin function?

The STAT2 pin provides additional status information, such as a fault or a temperature-related issue during charging.

18. Is the MCP73832T-2ACI/OT energy-efficient?

Yes, it is designed to be highly efficient, converting power to the battery with minimal energy loss.

19. Can I use the MCP73832T-2ACI/OT in a battery pack with protection circuitry?

Yes, you can use the MCP73832T-2ACI/OT in a pack with external protection circuitry, but it does not include internal protection features for the battery.

20. How do I choose the correct resistor for setting the charge current?

The charging current is determined by the resistor connected to the PROG pin. The datasheet provides specific formulas and values to select the appropriate resistor for your desired current.

This is an overview of the MCP73832T-2ACI/OT. Would you like additional details or assistance with a specific section?