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POWER ELECTRON C


This is where the μModule regulator provides an ideal answer; the concept is complex on the inside, simple on the outside – the efficiency of a switching regulator and the design simplicity of a linear regulator Careful design, PCB layout and component selection are very important in the design of a switching regulator andmany experienced designers have smelt the distinctive aroma of burning circuit board in the earlier days of their career. When time is short or power supply design experience is limited, the readymade μModule regulator saves time and reduces risk to the program.


. A recent example of an ultrathin


µModule solution is the LTM4622. This is a dual 2.5A, or single two-phase 5A output step-down power regulator in a 6.25mmx 6.25mmx 1.8mmultrathin LGA package. At nearly the height of a soldered down 1206 case size capacitor, its ultrathin height allowsmounting on the topside of the board. The thin profile allows it tomeet demanding height


restrictions such as those required by PCIe and advancedmezzanine cards in


embedded computing systems, as shown in Figure 1.


Linear’s µModule DC/DC regulators also provide a simple way to deliver both high power and DPSM capability. Since many of these regulators can be


paralleled for high load current with precision current matching (within a nominal 1% of each other) thereby mitigating the potential for hot spots. Moreover, only one of these regulators needs to contain DPSM capability, since it can supply the complete digital interface even if the rest of the µModule devices in


, Figure 2: Figure 2:


A combination o one TM4


A combination of onef LT


7 D & three LT LTM4650 µModule regulators


LTM4677 DPSM µModule & three LTM4650 µModule regulators


delivers 186A at 1V from a nominal 12V input


delivers 1 6A at 1V from a nominal 12V input


µModule


ONICI S


SUPPLEM SUP PLEMENT COVER


COVER STOR Y


parallel do not have DPSM capability. Figure 2 shows an application schematic of one LTM4677 (36A DPSM µModule regulator) in parallel with 3 LTM4650s (50A µModule regulators) for an 180A plus DPSM POL solution.


Having DPSM capability and ultrathin profiles in today’s communications systems provides a power supply


designer with simple and powerful ways to deliver high power outputs to nominal 1.0V core voltages such as those commonly found on the newest sub- 20nmASICs, GPUs and FPGAs. With an ultrathin profile of less than 2mmwhen mounted on the board, the LTM4622 allows the use of board space on the underside which would otherwise be left underutilised. This not only saves expensive PCB real estate, but reduces the amount of required cooling due to its overall operating efficiency.


Finally, using µModule regulators makes sense in these types of


environments since they can significantly reduce the debug time and allows for greater board area usage. This reduces infrastructure costs, as well as the total cost of ownership over the life of the product.


www.linear.com 01628 477 066


Linear Technology www.linear.com


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