The TPS2115ADRBR is a product from Texas Instruments, a well-known semiconductor company. The TPS2115 is a Power Path Controller, often used in systems requiring power path management to switch between two different power sources, such as batteries and AC power.
Pin Function Specifications and Circuit Principles
The TPS2115ADRBR comes in a VQFN-20 (Very Thin Quad Flat No-lead) package, which has 20 pins. Below is a detailed list of the pin functions, including their descriptions:
Pin Function List (VQFN-20 Package) Pin Number Pin Name Pin Type Function Description 1 VDD Power Input voltage supply for the device. The voltage range is typically from 2.7V to 6V. 2 VSS Ground Ground pin. This should be connected to the system ground. 3 PGND Ground Power ground for the device. Connect to system ground to complete the power path. 4 A1 Input First input for the power source, typically connected to a power supply or battery. 5 A2 Input Second input for the power source. Similar to A1, it provides an alternative power input. 6 OUT Output Output pin that delivers the chosen input source power to the load. 7 EN Control Enable pin that controls the operation of the power path switch. If high, the device operates; if low, it disables. 8 PGOOD Status Power good signal. It indicates that the output voltage is within acceptable limits. 9 FAULT Status Fault pin that signals if there is a problem with the power source or power path. 10 RST Control Reset input that can be used to reset the device or clear faults. 11 SENSE1 Input Input voltage sense for the first power input. Helps monitor voltage levels for the A1 pin. 12 SENSE2 Input Input voltage sense for the second power input. Helps monitor voltage levels for the A2 pin. 13 ISET Configuration Current limit set pin. Adjusts the current threshold for power input switching. 14 VDD2 Power Secondary voltage supply pin (for higher voltage sources or if the device is dual-powered). 15 INH Control Inhibit pin. It disables the input power path if pulled low. 16 STATUS Status General status pin that gives an overview of the operational state of the device. 17 PGOOD2 Status Secondary power good pin. Indicates whether the second power input is operating correctly. 18 VSS2 Ground Secondary ground connection for the device. This is important for dual power paths. 19 VOUT Output Output voltage pin that connects to the system's load. 20 NC No Connect No connection. This pin is not internally connected to the device and can be left unconnected in your design.Circuit Principle
The TPS2115ADRBR functions by selecting between two power inputs (A1 and A2) and providing the chosen power to the output (OUT). The device uses a combination of input sensing (SENSE1, SENSE2) and enable (EN) to determine which power input is appropriate for the system. The PGOOD and PGOOD2 pins provide feedback regarding the health of the selected input source. If either input is faulty, the device will switch off the output and may signal a FAULT condition. The RESET pin allows for manual reset in the event of a fault.
Frequently Asked Questions (FAQ)
Q: What is the operating voltage range for TPS2115ADRBR? A: The TPS2115ADRBR operates within a voltage range of 2.7V to 6V for the VDD and VDD2 pins. Q: How do I configure the current limit on TPS2115ADRBR? A: The current limit is configured through the ISET pin. You can adjust the current threshold by connecting an external resistor to this pin. Q: Can I use TPS2115ADRBR for both 5V and 3.3V systems? A: Yes, the TPS2115ADRBR can operate with both 3.3V and 5V systems as long as the supply voltages fall within the specified range (2.7V to 6V). Q: What happens when there is a fault condition on the input? A: When a fault condition occurs, the FAULT pin will be asserted, and the output will be disabled to prevent damage to the load or device. Q: Can I use both power inputs (A1 and A2) simultaneously? A: No, the TPS2115ADRBR selects only one input at a time. The device switches between A1 and A2 based on which one is functioning correctly. **Q: What is the role of the *PGOOD* pin?** A: The PGOOD pin indicates that the output voltage is within a healthy range, and it signals when the power is good. **Q: What is the *EN* pin used for?** A: The EN pin enables or disables the power path switch. A high signal allows the device to operate, while a low signal disables it. Q: How do I reset the TPS2115ADRBR? A: To reset the device, pull the RST pin low, which will clear any fault conditions and reset the device. **Q: What is the purpose of the *SENSE1* and SENSE2 pins?** A: These pins are used to monitor the input voltage levels for A1 and A2 to ensure they are within proper operating ranges before switching.**Q: Can the device operate without the *VDD2* pin connected?**
A: Yes, if only a single input source is being used, the VDD2 pin can be left unconnected.**Q: Can the *INH* pin disable both power paths?**
A: Yes, pulling the INH pin low disables both power paths, preventing power from being supplied to the load.**Q: Does the *STATUS* pin provide feedback on the power path operation?**
A: Yes, the STATUS pin provides an overall indication of the device's state, including whether the power path is active or in a fault condition.**Q: What is the significance of the *NC* pin?**
A: The NC pin stands for "No Connect," and it is not internally connected to the device. It can be left unconnected in your circuit.**Q: Can I use the *TPS2115ADRBR* in automotive applications?**
A: Yes, as long as the input voltage and operating conditions meet the requirements of the device, it can be used in automotive systems.**Q: How do I troubleshoot if the *PGOOD* signal is not active?**
A: Check the input voltage levels at A1 and A2 to ensure they are within range. If both inputs are faulty, the PGOOD signal will not activate.Q: What are the key advantages of using the TPS2115ADRBR?
A: It provides seamless switching between two power sources, offers built-in fault detection, and ensures stable power delivery to the load.Q: How does the device switch between the two inputs?
A: The device uses the voltage levels from SENSE1 and SENSE2 to determine which input is stable and within range, then switches accordingly.Q: Is the device suitable for low-power applications?
A: Yes, the TPS2115ADRBR is designed to be energy-efficient and can be used in low-power applications as long as the voltage levels are properly managed.Q: How can I ensure proper thermal management for the TPS2115ADRBR?
A: Ensure adequate heat sinking and thermal vias are used to dissipate heat efficiently, especially if operating in high-power environments.Q: Can the TPS2115ADRBR be used for portable devices?
A: Yes, it is well-suited for portable devices that require reliable power path management between battery and AC sources.This summary provides a complete view of the TPS2115ADRBR pin functions, including the device’s circuit principles and a FAQ section. The device's full functionality should be integrated into your design carefully based on these pinouts and configuration options.