Date
12/01/2014
PDF
LTM4623 3A µModule step-down regulator
Linear Technology introduced the LTM4623 3A µModule (micromodule) step-down regulator in an ultrathin 1.8mm profile LGA package with only a 6.25mm x 6.25mm footprint. 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 LTM4623 to be mounted on the backside of the PCB, freeing space on the topside for components such as memory and FPGAs. The LTM4623 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 LTM4623 solution fits in a 0.5cm² dual-sided PCB or <1cm² on a single-sided PCB. The circuit only requires one input capacitor and one output capacitor, a resistor to set VOUT, and a small capacitor for VOUT tracking and soft-start. With an auxiliary 5V bias, the LTM4623 operates from input supplies as low as 2.375V. The operating efficiency for converting 12VIN to 1.5VOUT and 3.3VOUT at 3A is 80% and 88%, respectively. Power loss for 12VIN to 1.5VOUT is 1.1W, resulting in only a 24°C rise in junction temperature. The LTM4623 is rated for operation from -40°C to 125°C. 1,000-piece pricing starts at $6.05 each.
