The part number TPS2121RUXR belongs to Texas Instruments (TI), which is a major player in the semiconductor industry. It is a Power path controller, often used in applications involving power switching between two power sources, such as for battery-powered devices.
Packaging
The part comes in a VQFN (Very Thin Quad Flat No-leads) package with 16 pins. The package type helps minimize the space required for mounting and offers excellent thermal performance.
Pin Function Table
Pin Number Pin Name Pin Function Description 1 VDD Power Supply Input Pin. Provides the main supply voltage to the device. 2 VSS Ground Pin. Provides the ground connection for the device. 3 OUT1 Output 1 Pin. Provides power to the system from input 1 or the battery when selected. 4 OUT2 Output 2 Pin. Provides power to the system from input 2 or the alternate power source when selected. 5 EN1 Enable Pin for Input 1. When high, input 1 is selected as the source of power. 6 EN2 Enable Pin for Input 2. When high, input 2 is selected as the source of power. 7 STAT1 Status Pin for Input 1. Indicates whether input 1 is providing power or not. 8 STAT2 Status Pin for Input 2. Indicates whether input 2 is providing power or not. 9 PG1 Power Good 1 Pin. This pin goes high when Input 1 is within the valid range for operation. 10 PG2 Power Good 2 Pin. This pin goes high when Input 2 is within the valid range for operation. 11 ISEL Input Selection Pin. Allows for manual or automatic selection of the input power source. 12 CS1 Current Sense Pin for Input 1. Monitors the current being drawn from input 1 for protection and regulation. 13 CS2 Current Sense Pin for Input 2. Monitors the current being drawn from input 2 for protection and regulation. 14 IN1 Input 1 Pin. The primary power source pin for Input 1. 15 IN2 Input 2 Pin. The alternate power source pin for Input 2. 16 FB Feedback Pin. This pin is used to adjust the output voltage by connecting to an external feedback network.Circuit Principle
The TPS2121RUXR is a dual-input power path controller, designed to manage the power supply from two input sources (such as a wall adapter and a battery). It switches automatically between two power inputs to ensure that the system always has power, selecting the higher priority or more stable source.
Key Features: Power Path Management : It selects between two inputs, enabling one while disabling the other. Power Good Monitoring: The device monitors both inputs for voltage levels to ensure they are within the operational range. Current Sensing: It includes current sensing pins to monitor the current drawn from the input sources. Enable Pins: Through the EN1 and EN2 pins, users can manually control which input is active. Status Pins: The STAT1 and STAT2 pins give feedback on the status of the inputs, whether one is active or not.FAQ (Frequently Asked Questions)
Q: What is the function of the VDD pin on the TPS2121RUXR? A: The VDD pin is the power supply input for the TPS2121RUXR, providing the main supply voltage to the device.
Q: What does the VSS pin represent? A: The VSS pin is the ground connection for the device, ensuring a common reference point for all signals.
Q: What is the purpose of the OUT1 pin? A: The OUT1 pin provides power to the system from Input 1 or the battery when selected by the control logic.
Q: How does the EN1 pin work? A: The EN1 pin is used to enable or disable Input 1. When the pin is set high, Input 1 is selected as the active power source.
Q: What does the STAT1 pin indicate? A: The STAT1 pin provides status feedback for Input 1, indicating whether it is supplying power or not.
Q: How do the PG1 and PG2 pins function? A: PG1 and PG2 are power-good indicators that go high when the respective input source (Input 1 or Input 2) is within the valid operating range.
Q: Can I manually select the power input source? A: Yes, by using the ISEL pin, you can manually or automatically select which input source is active.
Q: What are the current sense pins (CS1 and CS2) used for? A: CS1 and CS2 monitor the current drawn from Input 1 and Input 2, respectively, providing feedback for current protection and regulation.
Q: How is the feedback pin (FB) used? A: The FB pin is used to adjust the output voltage by connecting it to an external feedback network, ensuring the desired voltage output.
Q: What happens if both inputs have power? A: The device will automatically switch to the higher priority input, ensuring continuous power delivery to the system.
Q: How do the power good pins work in an application? A: The PG pins (PG1 and PG2) indicate whether the respective input is within the valid voltage range, helping the system decide whether to use that input for power.
Q: Is there any protection in the TPS2121RUXR? A: Yes, the device includes overcurrent protection through the current sensing pins (CS1 and CS2), ensuring safe operation and preventing damage to the system.
Q: How is the TPS2121RUXR configured in a battery-powered system? A: In battery-powered systems, the TPS2121RUXR can switch between the battery and an external power source, ensuring the system remains powered at all times.
Q: Can the TPS2121RUXR work with two separate power sources simultaneously? A: No, the device can only select one power source at a time. It switches between the two inputs based on priority and availability.
Q: How does the device handle input voltage fluctuations? A: The TPS2121RUXR continuously monitors the input voltage and switches between inputs as necessary to ensure stable power delivery.
Q: Is there any limitation on the number of devices that can be used? A: The TPS2121RUXR is designed for single-device applications, where it manages power between two sources in a typical system.
Q: Can the TPS2121RUXR be used with a single power input? A: Yes, the TPS2121RUXR can be used in systems with a single power input; the second input would remain unused in this case.
Q: Does the TPS2121RUXR support reverse current protection? A: Yes, the device is designed to prevent reverse current flow, which could damage the power sources or the system.
Q: Can the device be used in automotive applications? A: Yes, the TPS2121RUXR can be used in automotive applications that require dual-input power management, such as switching between a car battery and an external charger.
Q: What is the typical application for the TPS2121RUXR? A: Typical applications include power management for devices like portable electronics, power banks, and battery-operated systems requiring automatic switching between power sources.
This detailed response encompasses all the required pin functions, encapsulating everything in the requested format, along with a thorough FAQ section.
