Overview
Every electronic product needs power conversion, and the quality of that conversion affects both the efficiency of the product and the accuracy of the circuits it powers. Texas Instruments supplies one of the broadest power portfolios in the industry, from efficient step-down converters to ultra-low-noise linear regulators, and BeiLuo supplies them as an authorized Texas Instruments distributor with FAE support for power design.
Efficient Main Rails
The main rail of most systems is generated by a switching converter, because switching conversion is efficient across a wide voltage drop. The TPS54331 provides up to 3 amps from an input as high as 28 volts with an integrated switch and a light-load mode that improves efficiency when the load is small, which suits industrial and consumer supplies that run from a 12 or 24 volt rail. The fixed switching frequency simplifies the design of the inductor and the output filter, and the integrated switch removes an external transistor from the design.
Light-Load Efficiency
Many products spend most of their time at light load, where a converter's efficiency can fall if it does not have a light-load mode. The Eco-mode of the TPS54331 reduces switching at light load, which helps meet standby power targets and extends battery life.
Clean Analog and RF Rails
The switching that makes a converter efficient also makes it noisy, and that noise is unacceptable on an analog or RF rail. The solution is to post-regulate the sensitive rail with a low-noise LDO such as the TPS7A4700, which delivers up to 1 amp with only a few microvolts of output noise and a user-programmable output voltage set without an external divider. That configuration gives the efficiency of a switcher on the main rail and the quietness an LDO on the analog rail.
Power-Supply Rejection
The LDO's power-supply rejection ratio determines how much of the input ripple reaches the output across the frequency range that matters. A high rejection ratio means the analog circuits see a clean rail even though the input is a switching waveform, which is exactly what precision converters and amplifiers need.
Layout and Thermal
Power layout is unforgiving: the switching loop must be small to limit radiated EMI, the ground return must be solid, and the regulator must have a good thermal path. An LDO dissipates the voltage drop times the current, so a large drop at high current produces significant heat, and the thermal design must account for it. BeiLuo's FAE team reviews power-stage layout and thermal design during design-in.
Why BeiLuo
We hold mainstream TI converters and LDOs in regional stock and ship them with import, origin and RoHS documentation. Our engineers support topology selection, layout and thermal design, and can supply samples for bench validation before production.
Validating the Supply
Before production, measure the converter's efficiency across the load range, measure the output ripple and the LDO's output noise, and confirm the temperatures under sustained load. These measurements decide whether the supply meets its efficiency and noise targets, and they are cheaper to take before the board is committed.
Next Steps
Send your input and output range, current and noise requirements and we will propose a power set, confirm availability, and supply samples for validation.