Synchronous buck regulators handle 42V

National Semiconductor's LM3102 and LM3103 are the industry's first synchronous buck regulators to feature an input voltage range up to 42V.

National Semiconductor has added two high-efficiency Simple Switcher synchronous buck regulators to its PowerWise energy-efficient product family.

The LM3102 and LM3103 are the industry's first synchronous buck regulators to feature an input voltage range up to 42V.

Optimised for powering digital integrated circuits (ICs) in industrial and telecommunications applications, the 2.5A LM3102 and the 750mA LM3103 extend National's Simple Switcher synchronous product line, which includes the 1.5A LM3100.

Along with the LM3100, the LM3102 and LM3103 deliver up to 97% efficiency, which is eight points higher than comparable nonsynchronous products.

Integration of MOSFET switches and the use of small inductors enables a reduced system component count and very small solution size.

The buck regulators use a constant on-time (COT) control scheme, which requires no loop compensation.

They also include an integrated flywheel current injection control (FCIC), which allows for the use of ceramic capacitors rather than bulkier tantalum capacitors.

The LM3102 and LM3103 are quick and easy to design using National's online webench power supply design tools.

The LM3102 and LM3103 synchronous, step-down switching voltage regulators accept an input voltage of between 4.5V and 42V and have a programmable switching frequency up to 1MHz.

The LM3102 supplies up to 2.5A of current to loads with an output voltage as low as 0.8V.

The LM3103 supplies up to 750mA of current to output voltages as low as 0.6V.

Both regulators feature excellent line and load regulation.

The LM3102 and LM3103 also run in discontinuous mode for improved efficiency during light load conditions.

The regulators will not discharge a pre-biased output capacitor during start-up, ensuring a monotonic voltage ramp.

The products offer additional features such as programmable soft-start, valley current limit, output over-voltage protection and thermal shutdown for extra protection.

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