Texas Instruments provides a recommended PCB layout in the datasheet (Figure 23) and in the application note SLVA883. It's essential to follow these guidelines to minimize parasitic inductance and ensure proper operation.
The input capacitor value depends on the input voltage, output current, and desired ripple voltage. A general guideline is to use a capacitor with a value between 1uF to 10uF, with a voltage rating at least 1.5 times the input voltage. TI's Webench Power Designer tool can help with capacitor selection.
The TPS22994RUKT is rated for a maximum output current of 4A. However, the actual output current may be limited by the input voltage, output voltage, and thermal considerations. Be sure to check the device's thermal performance and power dissipation calculations to ensure reliable operation.
The TPS22994RUKT has a built-in overcurrent protection feature. To implement OCP, connect a sense resistor (Rs) between the output and GND, and set the OCP threshold voltage (Vocp) using an external resistor divider. The device will limit the output current when the sense voltage (Vrs) exceeds the OCP threshold voltage.
The EN (enable) pin is used to turn the device on or off. When EN is high, the device is enabled, and when EN is low, the device is disabled. You can use the EN pin to implement power sequencing, shutdown, or low-power modes in your system.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
