Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good PCB design practices, such as keeping the input and output capacitors close to the IC, using a solid ground plane, and minimizing trace lengths and widths to reduce EMI and noise.
Choose input capacitors with low ESR (Equivalent Series Resistance) and high ripple current rating. For output capacitors, select ones with low ESR, high capacitance, and a voltage rating that meets or exceeds the output voltage. Consult the datasheet and capacitor manufacturer's recommendations for specific guidance.
While the datasheet specifies an operating temperature range of -40°C to 125°C, it's essential to consider the maximum ambient temperature for reliable operation. Typically, it's recommended to keep the ambient temperature below 85°C to ensure optimal performance and reliability.
To ensure stability, follow the recommended component values and PCB layout. Additionally, consider the output capacitor's ESR and equivalent inductance, as well as the input capacitor's ESR and capacitance. You can also use simulation tools or consult with TI's application notes for guidance on preventing oscillations.
While the datasheet specifies a minimum input voltage of 2.7V, it's recommended to operate the TPS40009DGQG4 with an input voltage between 3.3V and 5.5V for optimal performance and efficiency.
TPS40009DGQG4 datasheet
by Texas Instruments
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