Modules mix efficiency, simplicity for power design

National Semiconductor Corp. rolls three new Simple Switcher power modules that the company describes as the first to drive high output voltage applications for a wide range of markets such as industrial, communications infrastructure and military.

The LMZ14201H, LMZ14202H and LMZ14203H power modules provide the efficiency of a synchronous switching regulator with the simplicity of a linear regulator, cutting out the external inductor and simplifying complex layout placement challenges typical of switching regulator designs.

The modules accept an input voltage rail between 6V and 42V and deliver an adjustable and highly accurate output voltage up to 24V. A single resistor adjusts the switching frequency to enable greater flexibility of design.

They are pin-to-pin compatible with other family members and integrate a shielded inductor while offering up to 97 percent efficiency. The integrated inductor alleviates EMI concerns as the modules comply with both CISPR 22 Class B radiated and conducted emissions standards.

The modules drive loads from 1A to 3A and are suited to generate intermediate bus voltages in systems using a distributed point of load architecture. Their efficiency and thermal performance make the modules suited for systems without airflow. Also, the products can be used in conjunction with an application-specific circuit to generate a -15V bias supply so audio amplifiers such as National's LME49880 achieve a wider dynamic range.

The LMZ14201H, LMZ14202H and LMZ14203H power modules are available now in a 7-pin, RoHS compliant, 10.16mm x 13.77mm x 4.57mm package with exposed-bottom pad. Priced in quantities of 500, the LMZ14201H costs $6.50, the LMZ14202H is $7.50 and the LMZ14203H is $9.50.