Texas Instruments provides a recommended PCB layout in the datasheet, but it's also recommended to follow general high-frequency PCB design guidelines, such as using a solid ground plane, minimizing trace lengths, and using vias to connect layers. Additionally, it's recommended to place the input and output capacitors close to the device and to use a Kelvin connection for the sense lines.
The selection of input and output capacitors depends on the specific application requirements, such as the input voltage range, output voltage, and output current. In general, it's recommended to use low-ESR capacitors with a high ripple current rating. The datasheet provides some guidance on capacitor selection, but it's also recommended to consult the capacitor manufacturer's datasheet and to perform simulations to ensure the capacitors meet the requirements.
The TPS40090PWR is rated for operation up to 85°C ambient temperature, but it's recommended to derate the device for reliable operation at high temperatures. The datasheet provides a thermal derating curve, and it's recommended to follow this curve to ensure reliable operation.
Proper thermal management is critical for reliable operation. It's recommended to use a heat sink with a thermal interface material (TIM) to reduce the thermal resistance between the device and the heat sink. The datasheet provides guidance on thermal management, and it's also recommended to follow general heat sink design guidelines, such as using a heat sink with a high thermal conductivity and a large surface area.
The TPS40090PWR is rated for operation from 4.5V to 18V input voltage, but it's recommended to operate the device within the recommended input voltage range of 5V to 15V for optimal performance. Operating the device outside of this range may affect its efficiency, stability, and reliability.
TPS40090PWR datasheet
by Texas Instruments
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