Ultrathin regulator meets PCIe height restrictions
The 3A Ultrathin Step-Down µModule Regulator, from Linear Technology comes in an ultrathin 1.8mm profile LGA package with only a 6.25mm x 6.25mm footprint. It is available at Farnell element14. With solder paste, the package height is less than 2mm, meeting the height restrictions of many PCIe (Peripheral Component Interconnect Express), Advanced Mezzanine Cards (AMC) for AdvancedTCA carrier cards in embedded computing systems.
The small size and low height allow the regulator to be mounted on the back of the PCB, freeing space on the topside for components such as memory and FPGAs.
The device operates from 4V to 20V input supplies and precisely regulates an output voltage from 0.6V to 5.5V with 1.5% maximum total DC output voltage error.
Application examples include ultra-dense data storage, gateway controllers and 40Gbps to 100Gbps network equipment.
The solution fits in a 0.5cm² dual sided PCB or under 1cm² on a singlesided PCB. The circuit only requires one input capacitor and one output capacitor, a resistor to set V, and a small capacitor for V tracking and softstart.
With an auxiliary 5V bias, the LTM4623 operates from input supplies as low as 2.375V. The operating efficiency for converting 12V to 1.5V and 3.3V at 3A is 80% and 88%, respectively.
Power loss for 12V to 1.5V is 1.1W, resulting in only a 24°C rise in junction temperature.
The regulator is rated for operation from 40°C to 125°C.
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