A good PCB layout is crucial for the SN6505ADBVR. TI recommends a 4-layer PCB with a solid ground plane, and the use of vias to connect the top and bottom layers. Keep the input and output capacitors close to the IC, and use a Kelvin connection for the output voltage sense.
To ensure stability, make sure the output capacitor has a low ESR, and the output voltage sense lines are properly routed. Also, add a small capacitor (e.g., 10nF) between the COMP pin and GND to improve stability. Additionally, ensure the input voltage is well-regulated and the input capacitor is properly sized.
Although the datasheet specifies a maximum input voltage of 5.5V, TI recommends limiting the input voltage to 5V to ensure reliable operation and prevent damage to the IC.
The output voltage accuracy is affected by the internal voltage reference, resistor tolerances, and output voltage sense lines. To calculate the output voltage accuracy, consider the internal voltage reference accuracy (±1.5%), resistor tolerances (±1%), and output voltage sense line resistances. A total accuracy of ±2.5% can be expected.
The EN (Enable) pin is used to turn the regulator on or off. When EN is high, the regulator is enabled, and when EN is low, the regulator is disabled. Use the EN pin to implement power sequencing, or to turn off the regulator during shutdown or low-power modes.
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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.
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