POWER
discharge while drawing a supply current of less than 1 µA while in shutdown mode.
Smaller is better
Fewer external components can be realized utilizing the MP3414A. It uses a 1 MHz switching frequency to allow smaller external components while its soft start feature minimizes external parts count. It can handle wide current load ranges. In addition, the integrated power MOSFET supports peak switching current above 3 A with an output reaching 5.5 V.
This versatility and wide-ranging power in a compact size is ideal with such applications as single-cell Li battery products, including two-cell and three-cell alkaline, NiMH, or NiCd formats. Wireless peripherals, gaming accessories, personal medical devices, and portable media players all benefit from a step-up converter like the MP3414A. The technology is moving quickly, and it is getting more and more compact. Compared to the SOP-J8, the MP3414AGJ-Z in a TSOT23 package is approximately 72% smaller, allowing for a significantly decreased footprint (Figure 3).
Maximising efficiency while lowering power consumption
The need for miniaturization is a constant driving force, and concurrent to that is the need to maintain reliability and power efficiencies. The BD9E202FP4-ZTL Buck Switching Regulator provides adjustable output and reliable power in a compact design (Figure 4).
While there may be a conception that going smaller means sacrificing load capabilities or reliable power delivery, that is not the case. The BD9E202FP4-ZTL does deliver a high conversion efficiency while also contributing to a lower power consumption requirement (Figure 5).
By providing a low standby current, battery- powered devices can benefit from minimal
Fig 3: As components are designed smaller and smaller, miniaturization of packaging types like the TSOT23 is necessary
power consumption when they are idle. Also, enabling efficient operation during light loads is achieved through constant on-time control.
Flyback converters for AC/DC and DC/DC
The flyback converter is a buck-boost converter that incorporates a fly-back transformer. It is used in both AC/DC and DC/DC conversion, where there is galvanic isolation between any outputs and the input, and offers the multiplication of voltage ratios with an added advantage of isolation. An isolated power converter features voltage mode control and current mode control as its
two control schemes. In most cases, current mode control should be dominant for stability when operated.
Buck-boost DC-to-DC converters A typical DC-to-DC converter with an output voltage magnitude greater or less than the input voltage is a buck-boost converter. Generating negative voltages is also possible. It is similar to a flyback converter, but instead of using a transformer, it uses a single inductor. Specifically, a buck-boost converter consists of two different topologies, with both producing a range of output voltages from larger than the input to as little as zero.
Fig 4: The BD9E202FP4-ZTL is a buck switching regulator that delivers reliable power in a smaller, more compact design
Fig 5: Designers look for high-efficiency DC-DC buck converters that can deliver efficiently and reliably MAY 2025 | ELECTRONICS FOR ENGINEERS 15
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