National Semiconductor complements Simple Switcher product family

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By eeNews Europe

National Semiconductor has enhanced its Simple Switcher family of power modules for output currents of up to 10A. The devices offer a number of new features for current sharing and frequency synchronization and are designed for industrial and communications applications.

For high-current intermediate rail and FPGA applications, multiple modules can be placed in parallel. With such configurations, output currents of up to 60A are achievable. As a measure to reduce switching noise in sensitive environments, the switching frequency of several modules can be synchronized.

The new LMZxxxxx power modules are pin-compatible with existing devices in this product family. Equipped with an integrated shielded inductor coil, the 10A power modules can operate at ambient temperatures of up to 70°C without fan or blower. With regard to EMC behavior, the chips comply with the CISPR 22 (Class B) standard for radiated and conducted emissions. This feature also ensures easy PCB design, explained Alex Chin, director of National Semiconductor’s Simple Switcher business unit.

According to Chin, the new modules boast the efficiency of a synchronous switching regulator with the simplicity of a linear regulator. Since the inductor is integrated into the TO-PMOD package, external inductors are no longer required.

Six of the 12 new power modules operate on input voltages between 6V and 36V and deliver an adjustable output voltage in the range between 0.8V and 6V. The second group is designed for input voltages between 6V and 20V; they deliver adjustable output voltages of 0.8V to 20V.

The devices are available in RoHS-compliant TO-PMOD packages with exposed-bottom pad for better heat conductance. Modules with up to 5A are provided in a 7-pin package, while the modules for output currents greater than 5A are available in 11-pin packages. In quantities of 1.000, the chips carry price tags between $10.93 and $18.00. Like all Simple Switcher power modules, the new types are supported by National Semiconductor’s Webench Power Architect design tool.

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