Torex Semiconductor introduced what the company claims to be the world's smallest 600mA dc-dc. The XC9281/82 is an ultra-small synchronous step-down dc-dc which can operate from 2.5V to 5.5V. It can deliver loads up to 600mA. Available in LGA-6B01 and a minuscule WLP-6-05 package, measuring only 0.96 x 0.88 x 0.33mm, a tiny dc-dc circuit of only 3.52mm2 can be implemented with a minimal number of external components.
The small size makes the XC9281/XC9282 series suitable for equipment requiring miniaturization and low profile mounting area, and battery-powered equipment such as mobile equipment. Applications for the dc-dc converter include smartphones, wireless earphones / headsets, wearable devices, DSC / Camcorder, portable game consoles, smartcards, power supplies for modules, and various small power sources.
Because the XC9281/82 uses such small packages and external components, the PCB area and therefore the length of the copper tracks is minimized, which results in extremely low radiated noise and excellent EMI performance.
Series Type A block diagram (Click on image to enlarge)
Hi-SAT COT control supports ultra-fast load transient response performance and a stable 6MHz switching frequency. Torex's ON Time architecture ensures extremely fast transient response compared with that of standard dc-dc solutions. The Hi-SAT COT also provides less fluctuation in isolation frequency against load and input voltage compared to conventional COT control solutions.
Series Type B block diagram (Click on image to enlarge)
The high-speed transient response technology makes the device suitable for applications requiring a fast response and output voltage stability for an instantaneous load fluctuation such as FPGA.
Graph of transient response (Click on graph to enlarge)
Due to increasing the oscillation frequency to a high frequency, the design reduces the mounting area.
The company designed the XC9281/82 to operate under lower capacitance values which will occur under dc-bias conditions. For this reason, the company says that designers can safely use smaller, lower cost 0603 size multi-layer capacitors without compromising on performance.
(Click on chart to enlarge)
Torex points out that improving on-resistance and thermal consumption can result in an efficiency equal to or higher than that of conventional products.
